Ul 142

 

UL 142

Steel Aboveground Tanks for  Flammable and Combustible Liquids

 

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UL Standard for Safety for Steel Aboveground Tanks for Flammable and Combustible Liquids, UL 142 Ninth Edition Edition,, Date Dated d Decem December ber 28, 2006 2006

with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating the date of publication or the date on which the changed requirement becomes effective. The new and revi revised sed requi requiremen rements ts are substa substantial ntially ly in accor accordance dance with Pro Proposal(s posal(s)) on this subject dated July 3, 2009 and October 2, 2009.  All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or  trans tr ansmit mitted ted in any for form m by any mea means, ns, ele electr ctroni onic, c, mec mechan hanica icall pho photoc tocopy opying ing,, rec record ording, ing, or ot other herwis wise e without prior permission of UL. UL provides provides this Standar Standard d as is witho without ut warranty warranty of any kind, kind, either expres expressed sed or implied, implied, including including but

In no eve event nt will UL be liab liable le for any spe specia cial, l, inc inciden idental tal,, con conseq sequent uential, ial, indirect indirect or sim simila ilarr dam damage ages, s, inability to use this Standard, even if UL or an authorized UL representative has been advised of the this Standard, regardless of the form of the claim.

harmless harml ess from and again against st any loss, expen expense, se, liability, damage, claim, or judgme judgment nt (incl (including uding reasonable reasonable

and/or other elements of the Standard having future effective dates as indicated in the note following the affected aff ected item. The prior text for requ requireme irements nts that have been revise revised d and that have a futu future re eff effective ective date are located located after the Standar Standard, d, and are preceded preceded by a SUP SUPERSE ERSEDED DED REQUI REQUIREM REMENT ENTS S notic notice. e.

 

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DECEMBER DECEMBER 28, 2006 (Title (Titl e Page Reprinted: Reprinted: Febr February uary 12, 2010) 1

 ANSI/UL 142-2010

UL 142 Standard for Steel Aboveground Tanks for Flammable and Combustible Liquids

Hazardous Liquids. The second edition was titled Aboveground Storage Tanks for Hazardous Liquids.

Ninth Edition December 28, 2006 This ANSI/UL Standard for Safety consists of the Ninth edition including revisions through throu gh Febr February uary 12, 2010. The most recent designation of ANSI/UL 142 as an American National Standard (ANSI) occurred on February 11, 2010 ANSI approval for a standard does not includ inc lude e the Co Cover ver Pag Page, e, Tra Transm nsmitt ittal al Pag Pages, es, Tit Title le Pag Page, e, or ef effec fectiv tive e dat date e information. The Departm Department of Defen Defense se (DoD) has edition adopted adop ted on Augu August st 11, The publication ofent revised pages or a new ofUL this142 Standard will not 1989. invalidate the DoD adoption. Comment Comm ents s or pro propos posals als for revision revisions s on any par partt of th the e St Stand andard ard may be submit sub mitted ted to UL at any tim time. e. Pro Propos posals als sho should uld be sub submit mitted ted via a Pro Propos posal al at http://csds.ul.com.

copyrights,, owner copyrights ownerships, ships, and right rights s regar regarding ding those Stan Standards dards shall rema remain in the sole and exclusive property of UL.

 

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UL 142

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DECEMB ER 15, 2007

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CONTENTS

INTRODUCTION 1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 .6 2 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 .7 2.1 Units of of Me Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 .7 2.2 Undated references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 .7 3 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

4 Ca Capacities and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 . 8A 5 Ma Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 . 8A 6 Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 .9 7 Tank Co Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 8 Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 9 Ma Manholes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 10 Fill, Drain, and Gauge Openings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 11 Pa Painting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 . 33

HORIZONTAL HORIZONT AL CYLINDR CYLINDRICAL ICAL CONSTR CONSTRUCTIONS UCTIONS 12 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 . 33 13 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 . 33 13.1 Ca Capacities and dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 13.2 St S teel thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 13.3 Heads and head joints ........................................................34 13.4 Compartment ta tank co construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 VERTICAL VERTIC AL CYLINDRIC CYLINDRICAL AL CONSTR CONSTRUCTIONS UCTIONS 14 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 . 39 15 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 40 15.1 Ca Capacities and dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 15.2 St S teel thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 15.3 Ta Tank top (roof) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41 RECTANGULAR CONSTRUCTIONS 16 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 41 17 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 41 17.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41 17.2 St S teel thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41 18 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 41 18.1 Hydrostatic st strength te test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41 18.2 To T op load test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

 

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 ALL SECONDA SECONDARY RY CONTAINME CONTAINMENT NT TANK CONSTRUC CONSTRUCTIONS TIONS 19 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 42 HORIZONTAL HORIZONT AL CYLINDR CYLINDRICAL ICAL CONSTR CONSTRUCTIONS UCTIONS 20 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 42 21 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 42 VERTICAL VERTIC AL CYLINDRIC CYLINDRICAL AL CONSTR CONSTRUCTIONS UCTIONS 22 G Ge eneral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 42B 23 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 44 23.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44 RECTANGULAR CONSTRUCTIONS 24 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 45 25 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 45 26 Pe 2r6fo .1rmHayndcreosTte as titc .st s.t.re. n. .g.th. .te t.e.s.t . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..4 45 5 26.2 Top load test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

27 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 45 27.1 Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 .45 27.2 Dike ca capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46 28 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 46 28.1 Al All diked tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 46 28.2 Open top dike constructions ...................................................46 28.3 Closed to top di dike co constructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46 29 Pe Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 47 29.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47 29.2 Buoyancy test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 .47 29.3 Hydrostatic load test ..........................................................47

30 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 47 30.1 All co constructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 47 30.2 Horizontal cy cylindrical ta tank co constructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47 30.3 V er ertical cylindrical tank constructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48 30.4 Rectangular ta tank co constructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48 31 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 . 48 31.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48 31.2 Saddles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48 32 Pe Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 50

 

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33 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 50 33.1 All ty types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 50 33.2 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 .50 34 Ladders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 35 St Stairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 .51 36 Runways . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 .51 37 He H eating Coils and Hot Wells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52 38 Sumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 52 PERFORMANCE TEST METHODS 39 Tank Le Leakage Te Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 52 39.1 Caution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52 39.2 Primary co containment ta tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 52 39.3 Secondary co containment ta tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53 40 Hy H ydrostatic Strength Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 53 40.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53 40.2 Te Test apparatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53 40.3 Primary co containment ta tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 54 40.4 Secondary co containment ta tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54 4 T ..5 41 2 To Bo Bu up oyLaonacdy T Teesstt . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .5 56 6 43 Hydrostatic Load Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 56 44 Tank Su Support Load Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 56 44A Lift Lug Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56A MANUFACTURING AND PRODUCTION TESTS 45 Primary an and Se Secondary Co Containment Ta Tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57 46 Diked Ta Tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 57 MARKINGS 47 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 57 48 Ma Marking Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57 48.1 All ta tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 57 48.2 Compartment ta tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58 48.3 Secondary co containment ta tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58 48.4 Diked tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 58 48.5 Rectangular tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59 49 Marking Method and Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 . 59

 APPENDIX ACap ACapaci aci ty and Wett Wetted ed Ar ea Table Tables s

 

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UL 142

DECEMBER DECEM BER 15, 2007

INTRODUCTION 1 Scope 1.1 Thes These e requ requirem irements ents cover ste steel el prim primary ary,, seco secondar ndary y and dik diked ed typ type e atm atmosph ospheric eric storage storage tan tanks ks exceeding 1.0 in aboveground applications. 1.1 revised December 15, 2007

1.1.1 Eac 1.1.1 Each h tank type may be fabricated fabricated in a combination combination of various shapes (cylindrical, (cylindrical, rectangular rectangular or  obround) and orientations (horizontal, vertical) with or without multiple compartments, as covered in this Standard. 1.1.1 added December 15, 2007

1.2 These tanks are intended intended for instal installatio lation n and use in accord accordance ance with the Flammable Flammable and Comb Combustibl ustible e Liquids Liquid s Code Code,, NFPA 30; the Stan Standard dard for Inst Installatio allation n of Oil-Burning Oil-Burning Equipm Equipment, ent, NFPA 31; the Motor Fuel Dispens Dis pensing ing Fac Facilit ilities ies and Rep Repair air Ga Garage rages, s, NFP NFPA A 30A 30A;; th the e St Stand andard ard fo forr the Ins Instal tallati lation on and Use of  Stationary Combustion Engines and Gas Turbines, NFPA 37; the Uniform Fire Code, NFPA 1; and the Internati Inte rnational onal Fire Code publis published hed by the International International Code Counc Council. il. 1.2 revised December 15, 2007

1.3 The tanks cove covered red by these requirement requirements s are fabricated, fabricated, inspected and test tested ed for leakage before shipment shipm ent from the facto factory ry as compl completely etely assembled vessels. 1.3 revised December 15, 2007

Production Liquids, API 12F. 1.4 revised December 15, 2007

1.6 The These se req requir uireme ements nts do not cov cover er spe specia ciall eva evalua luatio tions ns fo forr res resist istanc ance e to hur hurrica ricanes, nes, tor tornad nadoes oes,, earthquakes, floods, or other natural disasters; or resistance to vehicle impact. 1.6 revised December 15, 2007

liquids (such as shipping containers), or mobile use applications (such as mounted on a trailer). These types of products are covered by separate UN, DOT, or equipment product standards. 1.7 revised December 15, 2007

 

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2 Ge Genera nerall 2.1 2. 1 Units of Measurement Measurement 2.1.1 Value 2.1.1 Values s stat stated ed without parentheses parentheses are the requirement. requirement. Values in paren parentheses theses are explanatory explanatory or  approximate information. 2.2 2. 2 Undate Undated d refere references nces 2.2.1 Any undated 2.2.1 undated reference to a code or stan standard dard appearing appearing in the requirements requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 3 Glossary

3.1.1 ABOVEGR ABOVEGROUND OUND TANK TANK (ABOVEGROUND (ABOVEGROUND STORAGE TANK or AST AST 3.1.1 added December 15, 2007

3.2 ATMO ATMOSPH SPHERIC ERIC TAN 3.2 revised December 15, 2007

3.3 3.3.1 3.3. 1 DI DIK K to provide secondary containment of aboveground tank(s) but not intended to be pressurized for leak testing. Dike types include combinations of rectangular or cylindrical shapes or horizontal or vertical orientations. Open top dike constructions do not have covers to prevent precipitation or debris from entering the dike area. Closed top dike constructions have covers to resist precipitation or debris from entering the dike area. 3.3.1 added December 15, 2007

3.4 DI 3.4 DIKE KED D TA TAN N intended to provide at least 110 percent containment capacity of the primary tank(s) and spill containment. 3.4 revised December 15, 2007

3.5 3.6 EME EMERGE RGENCY NCY VEN 3.6 revised December 15, 2007

3.6.1 3.6. 1 INTE INTERSTI RSTITIAL TIAL SPACE SPACE (ANNULAR (ANNULAR SPACE or INTERSTICE INTERSTICE point for monitoring. 3.6.1 added December 15, 2007

 

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3.7 NO NORMA RMAL L VEN withdraw). Normal vents are designed so as not to exceed 1.0 psig (6.9 kPa) pressure and minus 0.5 psig (minus 3.4 kPa) in the tank. 3.7 revised December 15, 2007

3.8 Dele Deleted ted Decemb December er 15, 15, 2007 2007 3.8.1 PERF 3.8.1 PERFORMA ORMANCE NCE TES TEST T representative tanks. These tests are intended to verify compliance with all applicable performance requirements in a standard. 3.8.1 added December 15, 2007

while in normal use. 3.8.2 added December 15, 2007

containment. 3.9 revised December 15, 2007

3.9.1 3.9. 1 PROD PRODUCT UCTION ION TEST tests are intended to verify compliance with production requirements in a standard, such as leakage. 3.9.1 added December 15, 2007

only in abnormal use (from primary containment leakage or rupture). 3.9.2 added December 15, 2007

3.10 SECONDA SECONDARY RY CONTAINMENT CONTAINMENT ABOVEGROUND ABOVEGROUND TANK TANK FOR FLAMMABLE FLAMMABLE LIQUID containmen conta inmentt aboveg aboveground round tank contai contained ned within a steel secondary containment containment shell forming an interstitial (annular) space, which is capable of being monitored for leakage into the space from either  the inter interior ior or exter exterior ior walls walls.. Seco Secondary ndary containment containment aboveg a boveground round tank types include: horizontal horizontal cylindrical, vertical cylindrical, and rectangular. 3.10 revised December 15, 2007

3.11 STORAGE STOR TANKinstallation, (TANK (TAN K intended for AGE stationary and is not used for processing. 3.11 revised December 15, 2007

venting or heating. 3.12 added December 15, 2007

 

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4 Ca Capacities pacities and Dimensions Dimensions 4.1 Capacities, dimensions, and construction construction details shall comply with the applicable requirements of this standard. 4.2 Cap Capaci acitie ties s per foot of leng length th or hei height ght of cyl cylind indric rical al shells are given in Tabl Table e A1 of Ap Append pendix ix A for  convenience in checking capacities of tanks of various diameters. 4.3 The total (actual) (actual) capacity capacity of a tank shall not be: a) Less than the rated rated nominal nominal capacity and b) More than 105 percent percent of the rated nominal capacity. capacity. 4.3 effective June 28, 2007

5 Ma Materials terials 5.1 A tank shall be constructed constructed of comm commercia erciall or stru structur ctural al grade carbon steel per 5.2 or Type 304 or 316 stainless steel per 5.3. Only new material shall be used. 5.1 effective June 28, 2007

5.2 Carb Carbon on steel shall be in accordance with with (a), (b), or both:

Steel, Sheet and Strip, Hot Rolled, Carbon, Structural, High-Strength Low-Alloy and HighSheet and Strip, Heavy-Thickness Coils, Carbon, Hot-Rolled, ASTM A635/A635M. b) Have a carbon content content of 0.3 percent or less, or a carb carbon on equivalency equivalency (CE) of 0.53 percent percent or less as determined by the formula below, and mechanical strength and welding

CE = C+ (Mn +Si)/6 + (Cr + Mo + V)/5 +(Ni + Cu)/15

5.2 effective June 28, 2007

Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels, ASTM A240/A240M.

 

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of the full piece as rolled. Thickness is to be determined on the plate or sheet not less than 3/8 inch (9.5 mm) from a cut edge and not less than 3/4 inch (19.1 mm) from a mill edge. 6 Joints

constructions referenced in the appropriate Figures. Table 6.1 Joint types Tan k t y p e

J o i n t t y p es Sh el l s

Head s

Bo tt om

Ro o f

Co r n er  

Fi g u r e 6.1

Fi g u r e 6.2

Fi g u r e 6.3

Fi g u r e 6.4

Fi g u r e 6. 5

Horizontal cylindrica cylindricall (primary and secondary)

All a

Vertical c ylindri ylindrical cal (primary and secondary)

All a

Rectangular 

Diked a

Shelll joint #6 shal Shel shalll not be used on tanks with a diam diameter eter greater greater than 65 inch inches es (1.65 m) unle unless ss it is used on the shell of the secondary containment tank where the secondary containment shell is in direct contact with the primary tank.

 

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Figure 6. 6.1 1 Shell joints

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Figure 6. 6.2 2 Head joints for horizontal cylindrical tanks

11

 

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Figure 6. 6.3 3 Bottom joints for vertical cylindrical tanks Revised Figure 6.3 effective December 15, 2009

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Figure 6. 6.4 4 Roof Ro of joints for vertical vertical cylindrical tanks Figure 6.4 effective June 28, 2007

13

 

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Figure 6. 6.5 5 Corner joints

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7 Ta Tank nk Connections Connections 7.1 A tank connection connection shall be provided for each opening as illustrated illustrated in Figure 7.1 or 7.2 by:

The reinforcing plates illustrated in Figure 7.2 are optional.

15

 

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Figure 7. 7.1 1 Pipe connections Revised Figure 7.1 effective December 15, 2009

3 Pipe connections Nos. 3, 4, 5, 8, and 9 may be seal welded on the opposite side of the weld shown.

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Figure 7. 7.2 2 Top or shell connections (See Table 7.1) Revised Figure 7.2 effective December 15, 2009

2 DP   is the outside diameter of the pipe plus 5/8 inch (0.63 mm). 3 For SI units, 1 inch = 25.4 mm.

17

 

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Table 7.1 Top or shell connections (See Figure 7.2)  Al l di men mensi si on s in in inch ches es Table 7.1 effective June 28, 2007

Minimum thickness of  thickness

Size of connection

Outside diameter  of pipe

connection, pipe walla (n)

Diameter of hole in reinforcing plate (DR)

Length of side of  reinforcing plate (L)

Width of  reinforcing plate (W)

24

24

0.375

24-1/2

49-1/2

60

22

22

0.375

22-1/8

45-1/2

55-1/ 4

20

20

0.375

20-1/8

41-1/2

50-1/ 2

18

18

0.375

18-1/8

37-1/2

45-3/ 4

16

16

0.375

16-1/8

33-1/2

40-3/ 4

14

14

0.375

14-1/8

29-1/2

36

12

12-3/4

0.375

12-7/8

27

33

10

10-3/4

0.365

10-7/8

23

28-1/ 4

8

8-5/ 8

0.322

8-3/4

19

23-1/4

6

6-5/ 8

0.280

6-3/4

15-3/4

19-1/2

4

4-1/ 2

0.237

4-5/8

12

15-1/4

3

3-1/ 2

0.216

3-5/8

10-1/2

13-1/2

a

 ASTM A53/A53M, A134, A135, or A139. Pipe made from formed plate electrically butt-welde d may be substituted for any of the above-mentioned pipe sections.

7.2 Conn Connection ections s in the roof of vertical tanks shall be as illus illustrate trated d in Figure 7.1, 7.2, or 7.3. Conn Connection ections s illustrated in Figures 7.2 and 7.3 are optional.

Fittings, ASME B16.5. 7.4 If a weld welding ing coupling coupling is us used, ed, it sha shallll com comply ply wit with h th the e St Stand andard ard for For Forged ged Steel Steel Fit Fittin tings, gs, Socket Socket or Zinc-Coated (Galvanized) Welded or Seamless, for Use in Steel Pipe Joints, ASTM A865.

7.1.

 

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7.7 All pipe connection connection openings in a tank shall be protected protected with wooden or plastic plugs, metal covers, covers, or their equivalent, to protect threads and exclude foreign matter while in storage or in transit.

 

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Figure 7. 7.3 3 Roof connections for vertical tanks (roof nozzles) [See Tables 7.2 and 7.3]

2 If reinforcing plates are used, they shall be of a thickness equal to or greater than the roof thickness. 3 For SI units, 1 inch = 25.4 mm

 

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Table 7.2 Flanged roof connections (See Figure 7.3)

a

Nomina No minall siz size e of noz nozzl zle e, inch inches es

Maximu Ma ximum m dia diame mete terr of hol hole e in r oof  oof  plate or reinforcing plate (DP), inches

Outside diameter of reinforcing plate (DR), inches

1-1/2

DO a + 0.100

5

2

DO + 0.125

7

3 4

DO + 0.125 DO + 0.125

9 11

6

DO + 0.125

15

8

DO + 0.250

18

10

DO + 0.250

22

12

DO + 0.250

24

DO is the outside diameter of the pipe neck in inches.

Table 7.3 Threaded roof connections (See Figure 7.3)

a

Nomina No minall siz size e of noz nozzl zle e, inch inches es

Maximu Ma ximum m dia diame mete terr of hol hole e in r oof  oof  plate or reinforcing plate (DP), inches

Outside diameter of reinforcing plate (DR), inches

3/ 4 1

DOa + 0.100 DO + 0.100

4 4-1/2

1-1/2

DO + 0. 100

5

2

DO + 0.125

7

3

DO + 0.125

9

4

DO + 0.125

11

6

DO + 0.125

15

8

DO + 0.250

18

10

DO + 0.250

22

12

DO + 0.250

24

DO is the outside diameter of the coupling in inches.

 

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Table 7.4 Minimum length of threa Minimum thread d for threa threaded ded pipe connections connections Nominal pipe size, inches a

Minimum length of thread b i n c h es

(mm )

i n c h es

(m m )

1/ 8

1/4

(6.4)

1/ 4

3/8

(9.5)

3/ 8

3/8

(9.5)

1/ 2

1/2

(12.7)

3/ 4

5/8

1

5/8

(15.9)

0. 135

(3. 4)

(15.9)

0.150

(3. 8)

1- 1/4

11/16

(17.5)

0.150

(3.8)

1- 1/2

3/4

(19.1)

0.150

(3.8)

2

3/4

(19.1)

0.150

(3. 8)

2- 1/2

1

(25.4)

0.179

(4.6)

3

1

(25.4)

0.179

(4. 6)

3- 1/2

1

(25.4)

0.179

(4.6)

4

1-1/8

(28.6)

0.179

(4. 6)

5

1-3/16

(30.2)

6

1-1/4

(31.7)

a

8 1-3/8 (34.9) Standard for Welded and Seamless Wrought Steel Pipe, ASME B36.10.

b

The threaded connection shall comply with the Standard for Pipe Threads, General Purpose (Inch), ASME B1.20.1.

8 Venting 8.1 Each tank shall have normal and emergency emergency openings for venting. venting. These vent openings shall be in top of the tank. 8.1 revised February 12, 2010

8.1.1 Ea 8.1.1 Each ch prim primary ary con contai tainme nment nt tan tank k inc includi luding ng eac each h com compar partm tment ent of a com compar partm tment ent tan tank k sha shallll hav have e provisions for both normal venting and emergency venting. The tank penetration openings for these vents shall be located on the top of the tank. Horizontal cylindrical tanks shall center these vents along the top longitudinal axis. 8.1.1 added February 12, 2010

8.1.2 The interstitial space of a secondary secondary containment tank shall have provisions for emergency emergency venting. The tank penetration opening for this vent shall be located on the tank top, or near the top provided the penetration opening is above the liquid level should the primary tank leak at rated nominal capacity per  4.3 a) into the interstitial space. 8.1.2 added February 12, 2010

8.2 The normal normal venting shall be sized in accordance accordance with Table 8.2 and shall be at least as large as the inside diameter.

 

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8.3 The provision provision for emergency emergency venting venting shall be: a) An opening that complies complies with the requi requiremen rements ts in 8.4 and is provid provided ed for that purpose purpose only or 

complying with the requirements in 8.11. 8.3 effective June 28, 2007

 

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in Table 8.1. A vent opening that provides for both emergency and normal vents shall also have a capacity

Table 8.1 Emergency venting capacity for primary tanks and interstitial space of secondary containment tanks Wetted surface, square feeta,b

Venting Ven ting capacity, cubic fee feett per  hour c,d

Minimum opening, nominal pipe size, inches e

20

21,100

2

30

31,600

2

40

42,100

3

50

52,700

3

60

63,200

3

70

73,700

4

80

84,200

4

90

94,800

4

100

105,000

4

120

126,000

5

140

147,000

5

160

168,000

5

180

190,000

5

200

211,000

6

250

239,000

6

300

265,000

6

350

288,000

8

400

312,000

8

500

354,000

8

600

392,000

8

700

428,000

8

800

462,000

8

900

493,000

8

1000

524,000

10

1200

557,000

10

1400 1600

587,000 614,000

10 10

1800

639,000

10

2000

662,000

10

2400

704,000

10

2800 and over

742,000

10

a

Interpolate for intermediate values.

b

For SI units, m2 = ft 2

c

These values taken from NFPA 30. See 1.2.

d

For SI units, m3/s = ft3/h /hrr

e

0.093. 0.0 0. 03.

 

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8.5 The wetted wetted area of a horizo horizontal ntal tank is calculated calculated on the basis of 75 percent of the total exposed exposed area. diameters and lengths are included in Table A2 of Appendix A. 8.6 The wetted wetted area of a vert vertical ical tank is calculated calculated on the basis of the exposed exposed surface area of the tank shell. For vertical tanks on supports the bottom of the tank shall also be included in calculating the wetted the tank is included in the calculation. Values, to the nearest whole number, for wetted areas of vertical tanks of various diameters and heights are included in Table A3 of Appendix A. 8.7 The wetted area of rectangular rectangular tanks is calcu calculated lated on the basis of the exposed shell area exclu excluding ding the top surface of the tank. 8.8 A manhole in the top of a tank, with with a cover construct constructed ed so as to lift under internal internal pressure such such that the pressure pressure in i n the tank cannot cannot exceed a gauge pressure pressure of 2.5 psig (17.2 kPa) may serv serve e for emer emergency gency venting. Where emergency venting is provided by such manhole and cover, the tank shall include a vent opening for normal venting in accordance with the requirements in 8.11. 8.9 Eme Emergenc rgency y vent venting ing in acco accordanc rdance e with 8.8 may be obtained by an arran arrangemen gementt such that the cover  of a manhole not less than 16 inches (0.4 m) in diameter can be lifted vertically not less than 1-1/2 inches (38 mm) under conditions requiring emergency venting. 8.10 A long bolt manhole manhole intended for emergency emergency venting shall comply with Figure 9.1, except except that the The bolts shall have an unthreaded section so that the cover can lift a minimum of 1-1/2 inches (38 mm). 8.11 Each tank provided provided with a manho manhole le in accor accordance dance with 8.8 shall have a vent openi opening ng in the top of 

Table 8.2 Size of opening for normal venting Size Capacity Capa city of tank, U.S. U.S. gallons a

Minimum diameter, nominal pipe s ize ize,, inches b

Under 2,500

1-1/4

a

For SI SI units, units, gallon gallons s (U.S. (U.S. gallons) gallons)

b

See Standard for Welded and Seamless Wrought Steel Pipe, ASME B36.10.

3.8 = L. L.

 

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9 Ma Manholes nholes 9.1 Exce Except pt as noted in 9.3, a manhole for attachment attachment to the top of a tank shall be as illustrated illustrated in Figure 9.1 or 9.3. A manhole attached to the shell at a location below the top of the tank or to the head of a tank shall comply with Figure 9.2 or 9.4. Revised 9.1 effective December 15, 2009

9.1.1 9.1. 1 Eac Each h tank which is larger than 76 inches (1.93 m) diameter shall incorporate incorporate a manhole.  Added 9.1.1 effective December 15, 2009

9.2 Exce Except pt as noted in Figure 9.3, a manhole for attachmen attachmentt to the roof or top of a vertical cylindrical cylindrical tank shall be as illustrated in Figures 9.1, 9.2 or 9.3, and Table 9.1. The reinforcing plate and handles illustrated in Figure 9.3 are optional. A manhole attached to the shell of a vertical tank or side of a horizontal tank shall be as shown in Figure 9.2 or 9.4. A manhole of the type illustrated in Figure 9.2 shall comply with inches (0.6 mm) in size, shall also comply with Table 9.4 with regard to diameter of cover plate and bolt circle and the size and number of bolts. Revised 9.2 effective December 15, 2009

 

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Figure 9. 9.1 1 Top manholes (See Table 9.1) Revised Figure 9.1 effective December 15, 2009

point poi nt of the tank.

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Table 9.1 Top manholes and shell or head manholes (See Figures 9.1 and 9.2)

Size of manhole, inches

Nominall diame Nomina diameter ter of  neck (ID) or opening (DO), inches

Nominal diameter diameter of  cover plate (DC), inches

Nominal diameter diameter of  bolt circle (DB), inches

Minimum number of  bolts

16

16

20-1/2

19

16

18 20

18 20

22-1/2 24-1/2

21 23

18 20

22

22

26-1/2

25

22

24

24

28-1/2

27

24

30

30

35-1/2

33

42

36

36

41-1/2

39

52

 

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Figure 9. 9.2 2 Revised Figure 9.2 effective December 15, 2009

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Table 9.2 Roof manholes for vertical tanks (See Figure 9.3)

a

Size of  manhole,

Diameter of  neck (ID),

Diameter of  cover plate

Diameter of  bolt circle (DB ),

Minimum number of 

Diameter of  hole in roof  plate or  reinforcing plate (DP),

inchesa

inchesa

(DC ), inches a

inches a

bolts

inchesa

inchesa

16

16

20-1/ 2

19

16

16-5/8

38

18

18

22-1/ 2

21

18

18-5/8

40

20

20

24-1/ 2

23

20

20-5/8

42

22

22

26-1/ 2

25

22

22-5/8

44

24

24

28-1/ 2

27

24

24-5/8

46

Outside diameter of  reinforcing plate (DB),

For SI units, 1 inch = 25.4 mm.

Table 9.3  Al l di men mens s io ions ns are in in inch ches es un les s ot her wi se st ated

Equivalent b

Minimum thickness of cover plate

Maximum tank height, feet a

pressure , pounds per  square inch c

16-inch manholed

18-inch manholed

20-inch manholed

16-inch manholed

18-inch manholed

20-inch manhole d

21

9.1

1/4

1/4

5/ 16

1/ 4

1/ 4

1/ 4

27

11.7

5/ 16

5/16

3/8

1/ 4

1/ 4

1/ 4

32

13.9

5/ 16

5/16

3/8

1/ 4

1/ 4

1/ 4

35

15.2

5/ 16

3/8

7/ 16

1/ 4

1/ 4

5/16

24-inch manholed

30-inch manhole d

36-inch manholed

24-inch manholed

30-inch manholed

36-inch manhole d

7/16

1/2

1/ 4

5/16

3/ 8

a

21

9.1

3/8

27

11.7

7/ 16

1/2

5/8

5/16

3/ 8

7/16

32

13.9

7/ 16

9/16

9/ 16

5/16

7/16

1/ 2

35

15.2

1/2

5/8

11/16

3/ 8

1/ 2

9/16

For SI units, 1 foot = 0.3 m.

b c

Equivalent pressure is based on water loading. For SI units, a gauge pressure of 1 psi = 6.9 kPa.

d

For SI units, 1 inch = 25.4 mm.

9.3 A cover for a manhole in the top of a tank may be of the selfself-closing closing type type or may be secured by long bolts so that the cover can lift under internal pressure. See 8.10. 9.4 A ma manho nholele-cov cover er joint shall be pro provide vided d wit with h a rin ring g or fa face ce gas gasket ket of mat materi erial al determin determined ed to be Revised 9.4 effective December 15, 2009

 

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UL 142

Figure 9. 9.3 3 Roof manholes for vertical tanks (See Table 9.2) Revised Figure 9.3 effective December 15, 2009

t = 1/4 inch

3 For SI units, 1 inch = 25.4 mm.

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Figure 9. 9.4 4 Shell manholes for vertical tanks (See Tables 9.3 and 9.4) Revised Figure 9.4 effective December 15, 2009

2 For SI units, 1 inch = 25.4 mm.

31

 

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DECEMBER DECEM BER 28, 2006

Table 9.4 Shell manhole dimensions (S Shell (See ee Figure 9.4)  Al l di men mens s io ions ns are in in inch ches es un les s ot her wi se st ated

Frame using constantdiameter ring die

Thickness of  shell and manhole attachment (T)

 Ap pr oxi mat e radius (R)

Length of  s i de de (L )

Wi d th th (W )

Inside diameter of  manhole frame (ID)

Built-up frame or frame using constant diameter  plug die

Maximum diameter of  hole in shell (DH)

Inside diameter of  manhole frame (ID)

Maximum diameter of  hole in shell (D H)

16-Inch Shell Manhole 0. 167

3/16

38

45-1/ 2

18-5/8

20-1/4

16

17-3/4

1/ 4

1/4

38

45-1/2

18-1/2

20-1/ 2

16

18

Diameter of bolt circle D B   = 22-1/4 inches, Diameter of cover plate DC   = 22-3/4 inches 20-3/4 inch diameter bolts in 7/8 inch diameter holes 18-Inch Shell Manhole 0. 167

3/16

42

50-1/ 2

20-5/8

22-1/4

18

19-3/4

1/ 4

1/4

42

50-1/2

20-1/2

22-1/ 2

18

20

Diameter of bolt circle D B   = 24-1/4 inches, Diameter of cover plate DC   = 26-3/4 inches 20-3/4 inch diameter bolts in 7/8 inch diameter holes 20-Inch Shell Manhole 0. 167

3/16

46

55

22-5/8

24-1/4

20

21-3/4

1/ 4

1/4

46

55

22-1/2

24-1/ 2

20

22

Diameter of bolt circle D B   = 26-1/4 inches, Diameter of cover plate DC   = 28-3/4 inches 28-3/4 inch diameter bolts in 7/8 inch diameter holes 22-inch Shell Manhole 0. 167

3/16

50

60

24-5/8

26-1/4

22

23-3/4

1/ 4

1/4

50

60

24-1/2

26-1/ 2

22

24

Diameter of bolt circle D B   = 28-1/4 inches, Diameter of cover plate DC  = 30-3/4 inches. 28-3/4 inch diameter bolts in 7/8 inch diameter holes 24-Inch Shell Manhole 0. 167

3/16

54

65

26-5/8

28-1/4

24

25-3/4

1/ 4

1/4

54

64-3/4

26-1/2

28-1/ 2

24

26

Diameter of bolt circle D B   = 30-1/4 inches, Diameter of cover plate DC   = 32-3/4 inches 28-3/4 inch diameter bolts in 7/8 inch diameter holes 30-Inch Shell Manhole 0. 167

3/16

66

79-1/ 4

32-5/8

34-1/4

30

31-3/4

1/ 4

1/4

66

79-1/4

32-1/2

34-1/ 2

30

32

Diameter of bolt circle D B   = 36-1/4 inches, Diameter of cover plate DC   = 38-3/4 inches 42-3/4 inch diameter bolts in 7/8 inch diameter holes 36-Inch Shell Manhole 0. 167

3/16

78

93-3/ 4

38-5/8

40-1/4

36

37-3/4

1/ 4

1/4

78

93-3/4

38-1/2

40-1/ 2

36

38

Diameter of bolt circle D B   = 42-1/4 inches, Diameter of cover plate DC   = 44-3/4 inches 42-3/4 inch diameter bolts in 7/8 inch diameter holes

 

DECEMB ER 15, 2007

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10 Fill, Drain, Drain, and Gauge Gauge Openings 10.1 In addition to vent openings each tank and each compartmen compartmentt of a multicompartm multicompartment ent tank shall be

11 Painting 11.1 Unless Unle made ofcoat stainless stain steel, a tank, after having been tested teste d and free from leakage,during leakage, shall be given atssleast one ofless paint on exposed surfaces to protect them fromfound atmospheric corrosion storage at the factory premises and in transit to the installation site.

HORIZONTAL HORIZONT AL CYLINDR CYLINDRICAL ICAL CONSTR CONSTRUCTIONS UCTIONS 12 Ge General neral 12. 1 I n addi titi on on to com plyi ng ng wit h th e appli ca ca bl ble r equi re reme nt nts in Sect ion t a nk constructions, primary containment horizontal cylindrical tanks shall also comply with the requirements in Construction, Section 13. 13 Const Construction ruction 13.1 13 .1 Ca Capacities pacities and dimensions 13.1.1 13. 1.1 A hor horiz izont ontal al ta tank nk sha shall ll not exc exceed eed eit eithe herr th the e max maximu imum m cap capac acity ity or th the e dia diame meter ter fo forr th the e

Table 13.1 Revised Table 13.1 effective December 15, 2009

 Ac tu al cap aci ty , U.S. gal lo ns (kL ) 550 or less

(2.08)

Minimum steel thickness, inch (mm)

Maximum diameter, inches (m)

Car bo bo n s te teel

St ai ai nl nl es s s te teel

48 (1. 22)

0.093 (2.36)

0.071 (1.80)

13.1.2 13.1. 2 The overall overall leng length th of a hor horizo izonta ntall ta tank nk shall shall not be gre great ater er th than an six times times its diameter diameter.. Tan Tank k diameters exceeding 144 inches (3.66 meters) shall be further limited to a maximum of 72 feet (21.95 meters) in cylinder length. Revised 13.1.2 effective December 15, 2009

 

34

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13.2 13 .2 Ste Steel el thickness

capacity and diameter. 13.3 13 .3 He Heads ads and head joints 13.3. 13.3.1 of a(1.2 horizontal horiz tank shall construc constructed ted of not more than thre three e pieces fortotank diameter diameters of 481toA96head inches to ontal 2.4 m); and fourbe pieces for diameters of 97 to 156 inches (2.42 3.9 m). Whens two or more pieces are used, joints shall be one of the shell joint constructions described in Figure 6.1, except joint No. 6 shall not be used. Revised 13.3.1 effective December 15, 2009

13.3.2 effective June 28, 2007

steel not less than 5/16 inch (7.9 mm) thick or it shall be braced in accordance with Figure 13.1.

 

DECEMB ER 15, 2007

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Figure 13.1 Bracings for head and bulkheads (See Table 13.2) Revised Figure 13.1 effective December 15, 2009

bulkheads (No. 3).

3 For No. 1 through No. 4 bracing may be oriented in any direction, but must be placed within 6 inches (0.15 m) of center of head or bulkhead. Bracing for No. 5 must be vertical.

 

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Table 13.2

I-b eam s

C h a n n el s

Diameter of head, inches a

Inches a

Pounds b

Inches a

Pounds b

72 to 84

3

5.7

3

4.1

85 to 96 97 to 108

3 4

5.7 7.7

4 5

5.4 6. 7

109 to 120

5

10

5

6.7

121 to 132

5

10

6

8.2

133 to 144

5

10

6

8.2

a

For SI units, 1 inch = 25.4 mm.

b

For SI units, 1 kg = 2.2 pounds.

thickness. 13.3.4 effective June 28, 2007

with a dished radius equal to the tank diameter, and a knuckle radius of at least 1/10 of the tank diameter.  Added 13.3.6 effective December 15, 2009

Table 13.3 Revised Table 13.3 effective December 15, 2009

Di am et er In c h es

Mi n i m u m d ep t h m

In c h es

mm

Di am et er In c h es

Mi n i m u m d ep t h m

In c h es

mm

 

DECEMB ER 15, 2007

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13.4 13 .4 Compartme Compartment nt tank constructio n 13.4.1 A bulkhead of a compartment 13.4.1 compartment tank shall be constructed constructed so that leakage through through any bulkhead  joints will not be directed from one compartment to another. See Figure 13.1 for acceptable bulkhead constructions. Bulkheads are not allowed in tanks over 144 inches in diameter. Revised 13.4.1 effective December 15, 2009

13.4.2 13.4. 2 A bulk bulkhea head d of a sin single gle or dou double ble bulkhead bulkhead ta tank, nk, shall be con constr struct ucted ed of one piece for tan tank k diameters under 72 inches, of not more than two pieces for tank diameters from 72 to 96 inches, and three pieces for diameters of from 97 to 144 inches (2.42 to 3.6 m). When two or more pieces are used, joints shall be in accordance with Figure 6.1 Joints No. 1 or No. 2. Revised 13.4.2 effective December 15, 2009

 

38

UL 142

Figure 13.2 Bulkheads for compartment tanks Figure 13.2 deleted effective December 15, 2009

DECEMBER DECEM BER 15, 2007

 

DECEMB ER 15, 2007

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39

13.4.3 The minimum thickness 13.4.3 thickness of metal used for a bulkhea bulkhead d shall not be less than 0.167 inch (4.24 mm) for diameters of 76 inches (1.9 m) or less and 1/4 inch (6.4 mm) for diameters of more than 76 inches.

and Table 13.4. Revised 13.4.4 effective December 15, 2009

Table 13.4

Diameter of  head, inches a

In ch ch es

Pou n d s b

Up to 60

3

4.1

2

2

3/ 8

or 2-1/2

2-1/2

1/ 4

61 to 72

3

4.1

3

3

7/16

or 3-1/ 2

3-1/2

5/ 16

73 to 84

4

5.4

3-1/2

3-1/2

1/ 2

or 4

4

3/ 8

85 to 96

5

6.7

4

4

1/ 2

or 5

3-1/2

3/8c

97 to 108

5

6.7

4

4

3/ 4

or 6

4

3/8c

109 to 120

6

8. 2

5

5

5/ 8

or 6

4

1/2c

121 to 132

7

9. 8

5

5

3/ 4

or 6

4

9/16c

133 to 144

7

9. 8

5

5

3/ 4

or 6

4

9/16c

Channels  Ang les , in ch es a

a b

For SI units, 1 inch = 25.4 mm. For SI units, 1 kg = 2.2 pounds.

c

Short leg of angle welded to head.

made of not less than 5/16 inch (7.9 mm) thick material or it shall be braced in accordance with Figure 13.1 and Table 13.2. VERTICAL VERTIC AL CYLINDRIC CYLINDRICAL AL CONSTR CONSTRUCTIONS UCTIONS 14 Ge General neral 14. 1 I n addi titi on on to com plyi ng ng wit h th e appli ca ca bl ble r equi re reme nt nts in Sect ion t a nk constructions, primary containment vertical cylindrical tanks shall also comply with the requirements in Construction, Section 15.

 

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15 Const Construction ruction 15.1 15 .1 Ca Capacities pacities and dimensions 15.1.1 15.1. 1 The minimum diameter diameter of a vert vertical ical tank shall not be less than one-quarte one-quarterr of its height. 15.1.2 15.1. 2 The shell height of a vert vertical ical tank shall not be mor more e than 50 feet ( 15.24 m), and the diameter shall not exceed 14 feet (4.27 m).

Revised 15.1.2 effective December 15, 2009

15.2 15 .2 Ste Steel el thickness

Table 15.1

 Ac tu al capacity, U.S. gallons (kL)

Carr bon Ca bon ste stee el she shee et thic thickne kness, ss, inch ( mm) mm)

Sta tainle inless ss ste stee el she shee et thick thickne ness, ss, inch ( mm) mm)

Sh el l

Bo ttom

To p a

Sh el l

Bo ttom

To p

1100 or less

0.093

0.093

0.093

0. 086

0.086

0.086

(4.16 or less)

(2.36)

(2.36)

(2.36)

(2.18)

(2.18)

(2.18)

More than 1100

0.167

0.240

0.123

0.115

0.158

0.086

(mor (m ore e th than an 4. 4.16 16))

(4.2 (4 .24) 4)b

(3.12)

(2.92)c

(4.01)

(2.18)

a

(6.10)

See 15.3.3.

b

For a tank more than 25 feet (7.5 m) in height, all parts of the shell located more than 25 feet below the top edge of the shell shall not be less than 0.240 inch (6.1 mm) thick. c

For a tank more than 25 feet (7.5 m) in height, all parts of the shell located more than 25 feet below the top edge of the shell shall not be less than 0.158 inch (401 mm) thick.

15.3 15 .3 Ta Tank nk top (roof) 15.3.1 The top of a verti 15.3.1 vertical cal cylindrical cylindrical tank shall be constructed constructed of not mor more e than four pieces. If two or  more pieces are used, joints shall be one of the shell joint constructions described in Figure 6.1. 15.3.2 The top of a singl 15.3.2 single e wall and outer shell of a secondary containmen containmentt vertical vertical tank shall be dished or conical.

15.3.3 The height of a conical top shall not be less than one-sixth 15.3.3 one-sixth of the radius of the tank when the top is made of steel less than 0.167 inch (4.24 mm) thick and shall not be less than one-twelfth of the radius of the tank when the top is made of steel not less than 0.167 inch thick. A dished head shall have a depth

 

DECEMB ER 15, 2007

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41

15.4.1 The bottom of a vert 15.4.1 vertical ical cylindrical cylindrical tank shall be constructed constructed of not more than four pieces. pieces. If two or more pieces are used, joints shall be one of the shell joint constructions described in Figure 6.1, except that joint No. 6 shall not be used. 15.4.2 15.4. 2 Vert Vertical ical cylindrical cylindrical tanks eleva elevated ted on suppo supports rts shall meet the requirements requirements of paragr paragraph aph 30.3.  Added 15.4.2 effective December 15, 2009

RECTANGULAR CONSTRUCTIONS 16 Ge General neral 16. 1 I n addi titi on on to com plyi ng ng wit h th e appli ca ca bl ble r equi re reme nt nts in Sect ion t a nk constru cons tructio ctions, ns, pri primary mary con contain tainmen mentt rec rectang tangular ular tank tanks s shall also com comply ply wit with h the req require uiremen ments ts in Construction, Section 17, and Performance, Section 18. 17 Const Construction ruction 17.1 17. 1 Ge General neral 17.1.1 Stif 17.1.1 Stiffenin fening g bars may be atta attached ched to the tank wall either by intermittent intermittent or cont continuous inuous welding and may be placed on the inside or outside of the tank walls. 17.1.2 17.1. 2 Tie rods may be used inside inside of the tank. 17.1.3 17.1. 3 Baf Baffles fles shall be inter intermitt mittently ently welded or continuously continuously welded on the inside of the tank. 17.2 17 .2 Ste Steel el thickness 17.2.1 17.2. 1 Tan Tanks ks of this typ type e sha shallll be con constr struc ucted ted from steel not thi thinne nnerr tha than n 0. 0.093 093 inch (2. (2.36 36 mm mm)) if of  carbon steel or 0.071 inch (1.80 mm) if of stainless steel. 18 Pe Performance rformance 18.1 18 .1 Hydrostatic strength test 18.1.1 The tank shall be teste 18.1.1 tested d to demonstrate demonstrate that the strength of the asse assembly mbly and the welded joints are in accor accordance dance with the these se requir requirements ements.. 18.1.2 18.1. 2 The tank shall not rupture or leak when subjected subjected to the Hydrostati Hydrostatic c Stre Strength ngth Test, Section 40.

 

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18.2 18 .2 Top load test 18.2.1 Afte 18.2.1 Afterr being subjected subjected to the Top Load Test, Section Section 41, the tan tank k shall then be subjected to the Leakage Test, Section 39, and shall not leak.

 ALL SECONDA SECONDARY RY CONTAINME CONTAINMENT NT TANK CONSTRUC CONSTRUCTIONS TIONS 19 Ge General neral 19.1 All secondary containment tanks shall be constructed to provide provide a means for monitoring leakage into within the interstitial space to the point of monitoring. HORIZONTAL HORIZONT AL CYLINDR CYLINDRICAL ICAL CONSTR CONSTRUCTIONS UCTIONS 20 Ge General neral 20. 1 I n addi titi on on to com plyi ng ng wit h th e appli ca ca bl ble r equi re reme nt nts in Sect ion t a nk constructions, secondary containment horizontal cylindrical tanks shall also comply with the requirements in Construction, Section 21. 21 Const Construction ruction 21.1 The primary primary cont containm ainment ent tan tank k shell of a seco seconda ndary ry cont containm ainment ent tank shal shalll be cons constru tructe cted d in accordance with Par  and 13.

a direct contact secondary shell and heads may wrap a minimum of 300 degrees or provide a minimum of 95 perc percent ent contai containmen nment, t, which whichever ever is great greater. er. 21.2 effective June 28, 2007

21.3 21. 3 A sec second ondary ary tank she shellll tha thatt is not in dir direct ect contact contact with the prim primary ary tank sha shallll hav have e sta stando ndoff ffs s positioned as shown in Figure 21.1. Revised This construction is not allowed for tanks over 144 inches in diameter. 21.3 effective December 15, 2009

 

DECEMB ER 15, 2007

UL 142

Figure 21.1 Secondary containment tank standoff positioning

42A

 

42B

UL 142

DECEMBER DECEM BER 15, 2007

21.4 The standoffs standoffs shown in Figure 21.1 may be oriented with the web either parallel or perpendicular perpendicular to by 3/16 inch (4.8 mm) web] weighing 4.1 pounds per foot (6.1 kg per m). 21.5 If the outer shell of the secondary secondary cont containme ainment nt tank is in direct contact with with the primary primary containment containment Table 21.1. 21.6 If the heads of the secondary containment containment tank are not in direct contact with with the heads of the primary tank, the heads of the secondary tank shall have a minimum thickness as stated in Table 13.1 and be braced in accordance with Figures 13.1 and 13.2. Table 21.1 Minimum Mini mum steel thickness for outer shell of horizon horizontal tal secondary secondary conta containme inment nt tanks tanks in dire direct ct contact with prima primary ry contai containment nment tank shell Revised Table 21.1 effective December 15, 2009

Capacity U.S. g al l o n s

(k L )

550 or less

(2.08)

Maximum diamete Maximum diameterr of  primary tank, inches (m) 48

(1.22)

Minimum metal thickness, inch (mm) Car b o n s t eel 0.093

(2.36)

St ai n l es s s t eel 0.071

(1.80)

21.7 If the exterior exterior steel shell extends more than 12 inches (0.3 m) past the head of the primary tank, tank, the portion of the shell that is not in direct contact with the primary tank shall comply with the material and

21.8 The thickness thickness of a seco secondary ndary head that is in direc directt contact with the primary primary head may be reduc reduced ed

VERTICAL VERTIC AL CYLINDRIC CYLINDRICAL AL CONSTR CONSTRUCTIONS UCTIONS 22 Ge General neral 22. 1 I n addi titi on on to com plyi ng ng wit h th e appli ca ca bl ble r equi re reme nt nts in Sect ion t a nk constructions, secondary containment vertical cylindrical tanks shall also comply with the requirements in Construction, Section 23.

 

DECEMB ER 15, 2007

UL 142

No Text on This Page

43

 

44

UL 142

DECEMBER DECEM BER 28, 2006

23 Const Construction ruction 23.1 23. 1 Ge General neral 23.1.1 23.1. 1 The prim primary ary con contai tainme nment nt tan tank k she shellll of a sec second ondary ary con contai tainme nment nt ta tank nk sha shallll be con constr struct ucted ed in accordance with Par  15.

Primary Containment Tanks, Vertical Cylindrical Constructions, Sections 14 and 15. 23.1.3 A secondary 23.1.3 secondary containment containment tank shell that is not in direct contact with the primary primary tank shall have a means to securely position the primary tank within the secondary containment shell. 23.1.4 If th 23.1.4 the e out outer er she shell ll of th the e sec second ondary ary containme containment nt tank is in dir direct ect contact contact wit with h the pri primar mary y containment tank shell, the secondary containment shell may be constructed of steel with a thickness as

Table 23.1 Minimum Mini mum steel thickness for outer shell of verti vertical cal secondary secondary conta containme inment nt tanks tanks in dire direct ct contact with prima primary ry contai containment nment tank shell Carbon steel sheet minimum thickness, inch (mm) Capacity, U.S.

a

gallons a

Sh el l

Bo t tom

1100 or less

0.093 (2. 36)

0.093 (2. 36)

Over 1100

0.123b (3.12)

0.240 (6. 10)

For SI units, 1 U.S. Gallon = 3.78 L.

b

For a tank more than 25 feet (7.5 m) high, all parts of the shell located more than 25 feet below the top edge of the shell are not to be less than 0.167 inch (4.24 mm) thick. thick.

primary containment shell.

 

DECEMB ER 28, 2006

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45

RECTANGULAR CONSTRUCTIONS 24 Ge General neral 24. 1 I n addi titi on on to com plyi ng ng wit h th e appli ca ca bl ble r equi re reme nt nts in Sect ion t a nk constru cons tructi ctions, ons, seco secondar ndary y cont containm ainment ent rec rectang tangular ular tank tanks s shal shalll also comp comply ly wit with h the requ requirem irements ents in Construction, Section 25, and Performance Tests, Section 26. 25 Const Construction ruction 25.1 The primary primary cont containm ainment ent tan tank k shell of a seco seconda ndary ry cont containm ainment ent tank shal shalll be cons constru tructe cted d in accordance with Par 

primary containment shell. 26 Pe Performance rformance Test Test 26.1 26 .1 Hydrostatic strength test 26.1.1 The secondary 26.1.1 secondary conta containmen inmentt tank shall be tested to dem demonstra onstrate te that the stre strength ngth of the assem assembly bly and welded joints are in accordance with these requirements. 26.1.2 Neith 26.1.2 Neither er the primary or seco secondary ndary containmen containmentt tan tanks ks shall ruptu rupture re or leak when subjected subjected to the Hydrostatic Strength Test, Section 40. 26.2 26 .2 Top load test 26.2.1 Afte 26.2.1 Afterr being subjected subjected to the Top Load Test, Section Section 41, the tan tank k shall then be subjected to the Leakage Test, Section 39, and shall not leak.

27 Ge General neral 27.1 27. 1 De Details tails 27.1.1 27.1. 1 The requirements requirements in this Section Section cover open and closed top dike tank constructio constructions. ns. 27. 7.1 1.2 In add ddit itio ion n to co com mply lyiing wit ith h the ap appl pliica cab ble requ quir ire ement nts s in Sect ctio ion n tan ank k constructions and Part I (primary containment tanks) or II (secondary containment tanks) of this standard, a diked tank shall also comply with the requirements in 27.2.1; Construction, Section 28; and Performance Tests, Section 29.

 

46

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DECEMBER DECEM BER 28, 2006

27 27.2 .2 Dike capacity capacity 27.2.1 The actual dike capacity less the volum 27.2.1 volume e displaced by the supports or other internal apparatus apparatus except the tank shall be at minimum, 110 percent of the actual capacity of the tank. 28 Const Construction ruction 28.1 28 .1 All diked tanks carbon steel or 0.071 inch (1.80 mm) if of stainless steel. 28.1.2 28.1. 2 Butt Buttress resses es used to stif stiffen fen the side walls shall be at least the thickness thickness of the side wall. 28.1.3 Horiz 28.1.3 Horizontal ontal cylindrical cylindrical tanks shall be provid provided ed with suppo supports rts that comply with the requir requirement ements s of  Part IV of this standard. If supports are provided for other tank constructions, they shall comply with the requirements of Part IV of this standard.

and shall not become easily blocked by debris. 28.1.5 The supports, 28.1.5 supports, tank, or both shall be mechanically mechanically secured to, or integ integral ral with, the dike to prevent rotation and uplift of the tank. 28.2 28 .2 Open top dike constructions 28.2.1 Acce 28.2.1 Access ss and egre egress ss devices (ladder (ladder or stairs stairs)) shall be prov provided ided for the diked area if the height of  the interior dike wall exceeds 6 feet (1.8 m). 28.3 28 .3 Clo Closed sed top dike constructions 28.3.1 Close 28.3.1 Closed d top dike tank tanks s shall be provided with steel steel covers over the dike area to keep precipitati precipitation, on, debris, or other elements from entering the diked area, while also allowing for inspection.

28. 28.3.3 3.3 Cl Clos osed ed top dike dik e Section const co nstruc ructi ons sh shall all be pro provi vided ded wi with th a mea means ns fo forr em emerg ergenc ency y ven venti ting ng in accordance with Venting, 8.tions 28.3.4 28.3. 4 Clo Closed sed to top p dik dike e con const struc ructio tions ns wit with h cov covers ers intended intended to lif liftt for emergenc emergency y ven venti ting ng sha shallll not be provided with a means for securement or provision for locking (if locking interferes with the operation of  the emergency vent) and shall be marked in accordance with 48.4.1. Vent openings shall be constructed to direct venting upward away from the tank. 28.3.5 28.3. 5 Cover Covers s shall be cons construct tructed ed so as to reduce the risk of injury to pers persons ons during intended intended use.

 

DECEMB ER 28, 2006

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47

29 Pe Performance rformance Tests Tests 29.1 29. 1 Ge General neral 29.1.1 29.1. 1 Open and closed top dike tanks shall be subje subjected cted to the follo following wing tests. tests. 29.2 29 .2 Buoyancy test 29.2.1 29. 2.1 When subjecte subjected d to the Buoyancy Buoyancy Test, Section Section 42, the there re sha shallll be no evi evidenc dence e of stru structu ctural ral

29.3 29 .3 Hydrostatic load test 29.3.1 29.3. 1 When subjected subjected to the Hydrostatic Hydrostatic Load Test, Test, Section 43, there shall be no structural structural damage or  be no leakage as evidenced by visual inspection of the dike.

30 Ge General neral 30.1 30 .1 All constructions 30.1.1 30.1. 1 These requireme requirements nts cover supports supports integral integral to or secured to a tank or dike. 30.1.2 Tanks on supports 30.1.2 supports shall be constructed constructed to withstand, withstand, at minimum, a static load of two times the weight of the full tank without permanent deformation to the tank or supports, or both. 30.1.3 Suppo 30.1.3 Supports rts provided provided with thru thruholes holes for tiedown shall be slott slotted ed or openopen-ended ended to allow for thermal thermal expansion and contraction. 30.2 30 .2 Horiz Horizontal ontal cylindrical tank constructions 30.2.1 Saddles may be constructed as described in Construction, Section Section 31. Other saddle constructions or means of support are to be b e evalu evaluated ated by condu conducting cting structural structural analysis using calculations calculationsa, or tested in accordance with Performance Tests, Section 32. Other methods of structural analysis calculations, such

a

Stresses in Large Horizontal Stresses Horizontal Pressure Pressure Vessels on Two Saddle Supports Supports and many published sources based on his paper are useful references for this purpose.

 

48

UL 142

DECEMBER DECEM BER 28, 2006

30 30.3 .3 Ve Vertical rtical cylindrical tank constructio ns 30.3.1 30.3. 1 Ver Vertic tical al cy cylind lindric rical al tan tanks ks on sup suppor ports ts suc such h as skir skirts ts or leg legs s are to be eva evalua luated ted by st struc ructu tural ral b analysis using calculations or tested in accordance with Performance Tests, Section 32. b

The Pressure Pressure Vessel Design Handbook Handbook by Henry H. Bednar is a useful reference reference for this purpose.

30.4 30 .4 Re Rectangular ctangular tank constructio ns 30.4.1 Rect 30.4.1 Rectangula angularr tanks on suppo supports rts are to be evalua evaluated ted by struc structural tural analysis using calculations calculations or  tested test ed in accor accordance dance with Per Performan formance ce Test Tests, s, Sec Section tion 32. 31 Const Construction ruction 31.1 31. 1 Ge General neral 31.1.1 31.1. 1 Suppo Supports rts shall be constr constructe ucted d of mate material rial as descr described ibed in Mater Materials, ials, Section Section 5. 31.2 31. 2 Saddles 31.2.1 31.2. 1 The minimum material material thickness of saddles constructed constructed in acco accordanc rdance e with Figure 31.1 shall be

31.2.2 31.2. 2 Maxi Maximum mum height of saddles, saddles, when measured from the lowest lowest portion of the tank shell, shall be 12

31.2.3 31.2. 3 The base plate length length shall be at least 90 percent of the tank diameter. diameter. 31.2.4 The stiffener 31.2.4 stiffener thickness thickness shall be a minim minimum um of 3/8 inch (9.5 mm) for tank diameters diameters 6 feet (1.8 m) or less and a minimum of 1/2 inch (12.7 mm) for tank diameters greater than 6 feet. 31.2.5 The saddles shall 31.2.5 shall be positi positioned oned a distance of D/4 from the end of the primary tank, where where D is the diameter of the tank.

 

DECEMB ER 15, 2007

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49

Figure 31.1 Saddles for horizontal cylindrical tanks

Table 31.1 Minimum Mi nimum m at ateria eriall thickne thicknesses sses for saddl saddle e constructions in inche inches s Revised Table 31.1 effective December 15, 2009

Maximum Tank Diameter 

48

64

76

144

144

156

Top Flange Thickness

0. 093

0. 123

0.24

0.560

0.60

1.24

Wear Plate Thickness

0. 093

0. 123

0.24

0.240

0.365

0.49

4.5

6.0

6.0

9.0

10

12

Base Plate Thickness

0. 123

0. 167

0.50

0.75

0.9

1.24

Base Plate Width

6. 5

7.5

7.5

10

11

12

0.093

0. 123

0.167

0.240

0.365

0.365

3

3

4

6

6

6

Saddle Width

Web T hi ckness Minimum Number of  Stiffeners

31.2.6 Wear plates shall be used for tanks with capacities 31.2.6 capacities greater than 550 gallons (2.09 kL), and shall extend a minimum of 0.1 times the radius, in inches, above the saddle tips and have a minimum width of  b + 10t inches, where b is the width of the saddle and t is the thickness of the shell. Wear plates for  saddles of tanks above 144 inch (3.66 meter) diameter shall be at least 38 inches (965 mm) wide. Revised 31.2.6 effective December 15, 2009

 

50

UL 142

DECEMBER DECEM BER 28, 2006

32 Pe Performance rformance Tests Tests 32.1 As an option to struc structural tural analysis analysis of the support, support, the tank may be subjected to the Tank Support Support Load Test, Section 44. There shall be no damage to or permanent deformation of the tank or supports.

33 Ge General neral 33.1 33 .1 All types 33.1.1 The requ 33.1.1 requirem irements ents in this section cover opti optional onal tank acce accessor ssories, ies, com compon ponents ents,, and spec special ial constructions. 33.2 33. 2 Materials 33.2.1 33. 2.1 All materials materials used in fab fabric ricati ation on of the acc access essory ory sha shall ll be com compat patibl ible e wi with th the bas base e tan tank, k, used.

atmospher atmosp heric ic con condit ditions ions with whi which ch th the e par partt com comes es in con conta tact. ct. The These se mat materia erials ls sha shallll com comply ply wit with h th the e requirements for Gaskets and Seals, UL 157. 33.2.3 33.2. 3 All accessories accessories shall be constructed constructed to minim minimize ize the stresses stresses on the base tank. 34 Ladde Ladders rs 34.1 Exte Exterior rior ladders shall comp comply ly with the const constructi ruction on requi requiremen rements ts in i n accor accordance dance with the curre current nt edition of Occupational Safety and Health Standards, Title 29 of the Code of Federal Regulations, Part

34.2 Inte Interior rior ladders shall comply with the exterior exterior ladder requirement requirements s excep exceptt that the climbing surface must be vertical and directly in line with the edge of the tank manhole. Manholes shall not be less than 24 inches (0.6 m) in diameter. Hatch covers, if used, shall not be of the self-locking type if they can be opened only from the outside of the tank. 34.3 Lad 34.3 Ladder ders s sha shallll be des design igned ed to wit withst hstand, and, at min minimu imum, m, a sta static tic load of 1000 pou pounds nds (454 kg) for  ladders with a climb of 10 feet (3 m) or less and 2000 pounds (909 kg) for ladders with a climb of greater  than 10 feet. Suitability shall be determined by test as described in 34.4 and 34.5 or by calculations. 34.4 All ladders shall withstand withstand the load desc described ribed in 34.5 without damage to or perma permanent nent deformation deformation of the ladder or tank.

load of 1000 pounds (454 kg). The load is to be applied for 1 minute to a 3-1/2 inch (89 mm) wide block resting on the center of the longest rung. Ladders with a length of climb of greater than 10 feet shall support a static load of 2000 pounds (909 kg). The load is to be applied for 1 minute to the center of two rungs spaced 10 feet apart using 3-1/2 inch wide blocks.

 

DECEMB ER 28, 2006

UL 142

51

35 Stairs 35.1 Sta Stairs irs shall comp comply ly with the const construct ruction ion and performance performance requirements requirements in accor accordance dance with the current edition of Occupational Safety and Health Standards, Title 29 of the Code of Federal Regulations,

35.2 Guar Guardrails drails shall compl comply y with Sub-paragra Sub-paragraph ph 19101910-23(d 23(d)(1) )(1) of the Occupational Occupational Safety and Health Standards, Title 29 of the Code of Federal Regulations. 35.3 Spir Spiral al stairs on vert vertical ical tanks shall additionally additionally comp comply ly with Sub-paragra Sub-paragraph ph 1910. 1910.23(d) 23(d)(2) (2) of the Occupational Safety and Health Standards, Title 29 of the Code of Federal Regulations. 35.4 All stairs and guardrails guardrails shall withstand withstand the loads described described in 35.5 and 35.6, res respectiv pectively, ely, without damage to or permanent deformation of the ladder or tank. 35.5 Sta Static tic Load (Stairs (Stairs square foot (0.09 m2) area on the center of the longest step for a period of one minute. 35.6 Sta Static tic Load (Guardrail (Guardrail at a point on top of the rail located midway between the supports for a period of one minute. The load is to be applied using a 3-1/2 by 3-1/2 inch (89 by 89 mm) steel plate. 36 Runwa Runways ys 36.1 Ru 36.1 Runwa nways ys (ca (catwa twalks) lks) sha shall ll com comply ply wit with h the con constr struct uction ion req requir uirem ement ents s in acc accord ordanc ance e wit with h th the e Occup Oc cupati ationa onall Saf Safety ety and Hea Healt lth h Sta Standa ndards rds,, Tit Title le 29 of the Cod Code e of Fed Federa erall Reg Regulat ulations ions,, Par Partt 1910 1910,,

only required to have a guardrail on one side. 36.2 All runways and guardrails shall withstand withstand the loads described in 36.3 and 35.6, respectively, without damage to or permanent deformation of the base ladder or tank. 36.3 Sta Static tic Load (Runways one square foot (0.09 m 2) area on the center of the longest step for a period of one minute.

 

52

UL 142

DECEMBER DECEM BER 28, 2006

37 He Heating ating Coils and Hot Wells Wells

that stored in the tank, such as steam or hot water, shall have no joints in that portion located within the tank unless such joints are continuously welded or brazed. The coil or hot well connection shall exit from

made where a connection pierces the tank or a manhole cover. 38 Sumps 38.1 A sump that is provided provided as part of a tank assembly assembly shall be of stee steell having a thickness not less than and outside, or the equivalent. PERFORMANCE TEST METHODS 39 Ta Tank nk Leaka Leakage ge Test 39.1 39 .1 Ca Caution ution

instructed in precautions to be taken during such testing. The precautions should include the use of a test pressure. 39.2 39 .2 Primary containment tanks 39.2.1 39.2. 1 The leakage test is to be conducted conducted before painting the tank by a metho method d described in items (a)

original position and shape when the test pressure is released. a) Apply internal internal air pressure and use soap-suds, soap-suds, or equiva equivalent lent material material for the detec detection tion of  leaks. For a horizontal or rectangular tank, the test gauge pressure is to be not less than 3 psi (21 kPa) or more than 5 psi (35 kPa). For a vertical tank, the test gauge pressure is not to be less than 1-1/2 psi (10 kPa) nor more than 2-1/2 psi (17 kPa) or that gauge pressure above

and examine the tank for leakage. 39.2.1 effective June 28, 2007

39.2.2 39.2. 2 Eac Each h co compa mpartm rtment ent of a tan tank k hav having ing tw two o or mo more re com compar partme tments nts is to be tes teste ted d se separa parate tely ly for  leakage.

 

DECEMB ER 28, 2006

UL 142

53

39 39.3 .3 Se Secondary condary cont ainment tanks 39.3.1 Afte 39.3.1 Afterr completion completion of the primary primary containment containment shell, the tank is to be check checked ed for leakage using the method described in 39.2.1 and 39.2.2 for primary containment tanks.

pressurized using the method described in 39.2.1 and 39.2.2 and held for 1 hour to check for leakage. A continuous drop in pressure will be considered evidence of leakage. 39.3.3 While maintaining 39.3.3 maintaining pressure pressure on the primary tank, the inte i nterstit rstitial ial (annular) space bounded by the primary and secondary tank is to be pressurized to the pressures indicated in 39.2.1 and checked for  external leakage by applying a leak detection solution. There shall be no evidence of leakage or sign of  to the leakage test pressure, but shall return to its original position and shape when the test pressure is released. 39.3.4 As an option to the leakage test described 39.3.4 described in 39.3.2 and 39.3.3, the annular space may be tested by applying a vacuum of at least 13 inches of mercury for a minimum of 12 hours. If the tank is unable retested using the method described in 39.3.2 and 39.3.3. 40 Hydrostatic Strength Test Test 40.1 40. 1 Ge General neral 40.1.1 The hydrostatic 40.1.1 hydrostatic strength strength test is to be condu conducted cted as described in 40.3.1 and 40.4.1 using the test apparatus described in 40.2.1. Neither the primary containment tank nor the secondary containment shell shall rupture or leak when subjected to this test. 40.2 40 .2 Te Test st apparatus 40.2.1 The source of water pressure 40.2.1 pressure is to be capab capable le of maintaining a gauge pressure pressure of at least 30 psi (207 kPa) for a period of not less than 2 minutes. The pressure gauges are to be calibrated and have a dial range gauge pressure o (345 or 415 kPa), a face size of at le lea ast 3-1/2 in inc ches (89 mm) in diameter, graduations of a gauge pressure of 1 psi or 10 kPa maximum, and an accuracy of  the test pressure.

 

54

UL 142

DECEMBER DECEM BER 28, 2006

40 40.3 .3 Primary containment tanks 40.3.1 The tank and connections 40.3.1 connections are to be arran arranged ged as shown in Figure 40.1. All unused openings openings in the tank to be tested are to be plugged.

b) Press Pressure ure is to be applied gradually gradually to the tank in incre increment ments s of a gauge pressure pressure of 5 psi (35 kPa) at a rate not exceeding a gauge pressure of 2 psi (14 kPa) per minute. The gauge pressure is to be held for 2 minutes after each increment of a gauge pressure of 5 psi until the test gauge pressure of 25 psi (172 kPa) is attained.

c) Once the test pressure pressure is attained, attained, the tank is to be examined examined for visible signs of leakage or  rupture. 40.4 40 .4 Se Secondary condary cont ainment tanks 40.4.1 40.4. 1 Upon completion completion of the test on the primary containment containment shell as desc described ribed in 40.3.1, pressure pressure is and the test method is to be repeated to test the secondary containment shell. Pressure in the primary tank is to be maintained the same as the pressure of the annular space while testing the annular space.

 

DECEMB ER 28, 2006

UL 142

Figure 40.1 Test apparatus and arrangement

kPa).

55

 

56

UL 142

FEBRUARY 12, 2010

41 Top Load Test Test

one square foot (0.09 m 2) area at the weakest part of the tank top for a period of 5 minutes. 41.2 The lo 41.2 load ad is th then en to be re remo move ved. d. The There re sha shall ll be no per perma mane nent nt def deform ormat ation ion or lea leaka kage ge wh when en subjecting the tank to the Tank Leakage Test, Section, 39. 42 Buoya Buoyancy ncy Test Test

condition is to be maintained for a minimum of one hour. The tank shall not show uplifting from the dike

42.2 The dike is then to be emp emptied tied and the tank and dike are then examined. examined. There shall be no evidence of structural damage. 43 Hydrostatic Load Test Test 43.1 This test is to be conduc conducted ted immediately immediately following following the buoyancy buoyancy test. The dike is to be empti emptied ed and

exceed exc eeding ing L/250, L/250, whe where re L is the leng length th of the sid side e wal wall. l. After the dik dike e is emp emptie tied, d, th there ere shall be no evidenced by visual inspection of the dike. 43.1 revised February 12, 2010

43.2 The di 43.2 dike ke is th then en to be em empt ptied ied.. The There re sh shall all be no per perma manen nentt de defor forma matio tion n or lea leaka kage ge wh when en subjecting the tank to the Tank Leakage Test, Section 39. 44 Ta Tank nk Support Load Test 44.1 A tank provided with integral integral supports shall show no evidence of permanent permanent deformation deformation or damag damage e to the tank or supports when tested as described in 44.2.

tank. The tank and supports shall withstand this load for 2 minutes.

 

DECEMB ER 15, 2007

UL 142

56A

44A 44 A Lift Lug Test Test  Added 44A effective December 15, 2009

44A.1 Fitt Fittings ings intended intended to be used to lift and move a tank shall be subjected for not less than 1 minute

 Added 44A.1 effective December 15, 2009

44A.2 44A .2 Fol Follow lowing ing this tes test, t, th the e tan tank k sha shallll not leak when tes teste ted d per the prod product uction ion leakage leakage tes test. t. The lift itself, of the tank wall itself, or of any metal weld attachment.  Added 44A.2 effective December 15, 2009

44A.3 As an alter alternative native to testing, testing, calculations calculations at two times the empty tank weight may be used provided provided deformation in excess of 1 percent of its original dimensions.  Added 44A.3 effective December 15, 2009

 

56B

UL 142

No Text on This Page

DECEMBER BER 15, 2007 DECEM

 

DECEMB ER 28, 2006

UL 142

57

MANUFACTURING AND PRODUCTION TESTS 45 Primary and Secondary Secondary Containment Tanks 45.1 Each primary primary and secon secondary dary containment containment tank, before before paint painting, ing, shall be teste tested d by the manufacturer  manufacturer  and determined to be tight against leakage using the method of the Tank Leakage Test, Section 39. 45.2 If leaks are not 45.2 noted ed dur during ing testing, testing, the tank is to be mad made e tig tight ht by wel welding ding and reteste retested. d. Defects Defects in welds are to be repaired by chipping or melting out from one or both sides of the joint, as required, and rewelding. 46 Dike Diked d Tanks 46.1 Each primary primary or second secondary ary containment containment tank, before painting, painting, shall be teste tested d by the man manufactu ufacturer  rer  and determined to be tight against leakage using the method of the Tank Leakage Test, Section 39. 46.2 46. 2 Ea Each ch dik dike e she shell ll is to be ins inspec pecte ted d bef befor ore e pai painti nting ng for welding welding def defect ects s wit with h a dy dye e pen penetr etrant ant,, and outside), visual inspection may be used. The Hydrostatic Load Test, Section 43, may also be used to determine welding defects. 46.3 If leaks are not 46.3 noted ed dur during ing testing, testing, the tank is to be mad made e tig tight ht by wel welding ding and reteste retested. d. Defects Defects in welds are to be repaired by chipping or melting out from one or both sides of the joint, as required, and rewelding. MARKINGS 47 Ge General neral 47.1 Ea 47.1 Each ch tan tank k sh shall all be ma mark rked ed as in indic dicat ated ed in Ma Marki rking ng El Eleme ement nts, s, Se Sect ction ion 48 48,, usi using ng th the e me meth thod od described in Marking Method and Location, Section 49. 48 Ma Marking rking Ele Elements ments 48.1 48 .1 All tanks 48.1.1 48.1. 1 Each tank shall shall be mark marked ed with:

b) One of the follo following wing statements, statements, as applicable: applicable: 1) This Tank Requires Requires Emergenc Emergency y Relief Venting. Venting. Capacity Capacity Not Less Less Than ____ CFH based on installation installation within within one foot of the tank top, with the appropriat appropriate e value derived from Table 8.1 inserted; or  2) For tanks provided provided with a manhole of the long bolt type in accordance with with the requiremen requi rements ts in 8.10, the manhole cover shall shall be mark marked: ed: This Manhole Manhole Is Provided With Long Bolts To Permit Emergency Relief Venting. Do Not Replace With Shorter  Bolts. c) The statement statement:: This Tank is Intended Intended for Stationary Stationary Installa Installation tion Only.

 

58

UL 142

DECEMBER DECEM BER 28, 2006

d) If a manuf manufactu acturer rer produces produces tanks at more than one factory, each each tank shall have a dist distinctiv inctive e

f) When the tank tank has integral integral welded steel steel supports the the tank shall be marked: marked: On Supports. Supports. The mark shall be adjacent to the conformity mark. 48.1.1 effective June 28, 2007

48.2 48 .2 Compartme Compartment nt tanks 48.2.1 In addition to the markings required 48.2.1 required in 48.1.1 48.1.1,, compartment compartment tanks shall also be marked with the following: a) The applicable venting venting statements statements as descr described ibed in 48.1. 48.1.1(b) 1(b) for each compartment. compartment.

48.3 48 .3 Se Secondary condary cont ainment tanks 48.3.1 In addition to the markings 48.3.1 markings requir required ed in 48.1. 48.1.1 1 and 48.2.1, as applic applicable, able, secondary secondary conta containmen inmentt tanks shall also be marked with the following statements: a) The Annular Annular Space Requires Requires Emergenc Emergency y Relief Venting. Venting. Capacity Capacity Not Less Less Than ____ Cubic Cubi c Feet Per Hour, with the appropriate appropriate value value derived from from Table 8.1 inserted. inserted. b) Pres Pressurize surize Primar Primary y Tank When When Pressure Pressure Testing Testing Annular Annular Space Space or equivalent equivalent wording. wording. 48.4 48 .4 Dike Diked d tanks 48.4.1 In addition to the markings required 48.4.1 required by 48.1.1 and 48.2.1, diked tanks shall also be marked with the statements: a) Op Open en Top Dike Diked d or Clo Closed sed Top Top Diked Diked . The mark mark shall shall be adjac adjacent ent to the conf conform ormity ity mark. b) The capacity capacity of the diked area in U.S. gallons. gallons. The capacity capacity may also be expressed expressed in terms of percent containment of the primary tank. c) (For closed closed top diked tanks only only where the cover cover is used for emergency emergency venting) venting) Cove Cover  r  Used For Emergency Venting. Do Not Secure Cover.

 

DECEMB ER 28, 2006

UL 142

59

48.5 48 .5 Re Rectangular ctangular tanks 48.5.1 If a tank is subjected 48.5.1 subjected to a gauge pressure 15 psi (103 kPa) hydrostatic hydrostatic test pressure pressure as covered in the Exceptio Exception n to 40. 40.3.1 3.1(b) (b),, the tank sha shallll be mar marked ked to ind indica icate te a max maximu imum m lea leakag kage e te test st gaug gauge e pressure of 3 psi (21 kPa). 49 Ma Marking rking Method and Location 49.1 The required required mark marking ing shall be embossed, etched, etched, stamped on a nameplate of corro corrosion sion resistant resistant metal, or as described in 49.2. The markings shall be in a size and style of type corresponding to 18 point Franklin Gothic [1/4 inch (6.4 mm) high letters] or the equivalent. The nameplate shall be attached by welding or brazing or by attaching it by drive screws, rivets, welding, or brazing to a bracket or holder that is then welded or brazed to the tank. 49.2 If a pressure-sensit pressure-sensitive ive label, ink or paint stenciling stenciling,, or other method method is used, it shall comply with the requireme requ irements nts in the Standard Standard for Marking and Labeling Systems, Systems, UL 969; be suitable for outdo outdoor or use and

49.3 For primary and secondary secondary containment containment tanks, the nameplate shall be secu secured red to the tank. 49.4 For tanks 49.4 tanks pro provide vided d wit with h a man manhole hole of the long bolt ty type, pe, the ma marki rking ng in 48. 48.1.1 1.1 shall be sec secure ured d directly to the manhole cover. 49.5 For diked tanks, the nameplate nameplate shall be secured to the exter exterior ior of the dike shell.

 

60

UL 142

No Text on This Page

DECEMBER BER 28, 2006 DECEM

 

DECEMB ER 28, 2006

UL 142

A1

 APPENDIX A Capacity and Wetted Area Tables Table A1 Gallon Ga llon capacity per foot of length Diameter in inches

U.S. gallons 1-foot length

Diameter in inches

U.S. gallons 1-foot length

Diameter in inches

U.S. gallons 1-foot length

24

23.50

65

172.38

105

449.82

25

25.50

66

177.72

106

458.30

26

27.58

67

183.15

107

467.70

27

29.74

68

188.66

108

475.89

28

31.99

69

194.25

109

485.00

29

34.31

70

199.92

110

493.70

30

36.72

71

205.67

111

502.70

31

39.21

72

211.51

112

511.90

32

41.78

73

217.42

113

521.40

33

44.43

74

223.42

114

530.24

34

47.16

75

229.50

115

540.00

35

49.98

76

235.66

116

549.50

36 37

52.88 55.86

77 78

241.90 248.23

117 118

558.51 568.00

38

58.92

79

254.63

119

577.80

39

62.06

80

261.12

120

587.52

40

65.28

81

267.69

121

597.70

41

68.58

82

274.34

122

607.27

42

71.97

83

281.07

123

617.26

43

75.44

84

287.88

124

627.00

44

78.99

85

294.78

125

638.20

45

82.62

86

301.76

126

647.74

46

86.33

87

308.81

127

658.60

47

90.13

88

315.95

128

668.47

48

94.00

89

323.18

129

678.95

49

97.96

90

330.48

130

690.30

50

102.00

91

337.86

131

700.17

51

106.12

92

345.33

132

710.90

52

110.32

93

352.88

133

721.71

53

114.61

94

360.51

134

732.60

54

118.97

95

368.22

135

743.58

55

123.42

96

376.01

136

754.64

56

127.95

97

383.89

137

765.78

57

132.56

98

391.84

138

776.99

58

137.25

99

399.88

139

788.30

59

142.02

100

408.00

140

799.68

60

146.88

101

416.00

141

811.14

61

151.82

102

424.48

142

822.69

62

156.83

103

433.10

143

834.32

63

161.93

104

441.80

144

846.03

64

167.12

 

 A2

UL 142

DECEMBER DECEM BER 15, 2007

Table A2 Wetted areas for horizontal tanks (Wetted area equals 75 percent of total area) Revised Table A2 effective December 15, 2009 Tank Diameter, feet a 3

4

5

6

7

8

9

Tank length, feet a

10

11

12

13

b

3

32

4

39

55

5

46

65

88

6

53

74

100

128

7

60

84

112

142

173

8

67

93

124

156

190

226

9

74

102

136

170

206

245

286

10

81

112

147

184

223

264

308

353

11

88

121

159

198

239

283

329

377

428

12

95

131

171

213

256

301

350

400

454

509

13

102

140

183

227

272

320

371

424

480

537

598

14

109

150

194

241

289

339

393

447

506

565

628

15

116

159

206

255

305

358

414

471

532

594

659

16

123

169

218

269

322

377

435

495

558

622

690

17

130

178

230

283

338

395

456

518

584

650

720

18

137

188

242

298

355

414

477

542

610

678

751

19

197

253

312

371

433

499

565

636

707

781

20

206

265

326

388

452

520

589

662

735

812

21

216

277

340

404

471

541

612

688

763

843

22

225

289

354

421

490

562

636

714

792

873

23

235

300

368

437

508

584

659

740

820

904

24

244

312

383

454

527

605

683

765

848

935

25

324

397

470

546

626

706

791

876

965

26

336

411

487

565

647

730

817

905

996

27

347

425

503

584

668

754

843

933

1 027 10

28 29

359 371

440 454

520 536

603 622

690 711

777 801

869 895

961 989

10 1 057 1 088 10

30

383

468

553

641

732

824

921

1018

1118

31

395

482

569

659

753

848

947

1046

1149

32

496

586

678

775 77

871 87

972 97

1074

1180

33

510

602

697

796 79

895 89

999 99

1103

1210

34

524

619 61

715 71

817 81

918 91

1025

1131

1241

35

539

635 63

734 73

838 83

942 94

1051

1159

1272

36

553

652 65

753 75

860 86

966 96

1077

1187

1302

37

567

668 66

772 77

881 88

989 98

1103

1216

1333

38

685

791

902

1013

1129

1244

1363

39

701

810

923

1036

1155

1272

1394

40

718

828

944

1060

1181

1301

1425

41

734

847

966

1083

1207

1329

1455

42

751

866

987

1107

1233

1357

1486

43

767

885

1008

1130

1259

1385

1517

Table A2 Continued on Next Page

 

FEB RUA RY 12, 2010

UL 142

A3

Table ble A2 Continued Ta Tank Diameter, feet a 3

4

5

6

7

8

9

Tank length, feet a

10

11

12

13

b

44

904

1029

1154

1284

1414

1547

45

923

1051

1178

1310

1442

1578

46

941

1072

1201

1336

1470

1609

47

960

1093

1225

1362

1798

1639

48

979

1114

1248

1388

1527

1670

49

998

1135

1272

1414

1555

1700

50

1157

1295

1440

1583

1731

51

1178

1319

1466

1612

1762

52

1199

1342

1492

1640

1792

53

1220

1366

1518

1668

1823

54

1246

1389

1544

1697

1854

55

1263

1413

1570

1725

1884

56

1437

1593

1753

1915

57

1460

1622

1781

1945

58 59

1484 1507

1648 1674

1809 1839

1976 2007

60

1531

1700

1867

2037

61

1726

1895

2068

62

1752

1923

2099

63

1778

1951

2129

64

1803

1980

2160

65

1829

2007

2190

66

1855

2036

2221

67

2064

2252

68

2093

2282

69

2121

2313

70

2149

2343

71

2177

2374

72

2205

2405

a

For SI units, 1 ft = 0.3 m.

b

For SI units, 1 ft 2 = 0.09 m2.

 

 A4

UL 142

FEBRUARY 12, 2010

Table A3 Wetted areas for vertical tanks (Area of shell to elevation not more than 30 feet above bottom) Revised Table A3 effective December 15, 2009 Tank Diameter, feet a 3

4

5

6

7

8

9

Tank length, feet a

10

11

12

13

14

b

3

28

4

38

50

5

47

63

6

56

76

94

113

7

66

88

110

132

154

8

75

101

127

151

176

79

201

9

85

113

141

170

198

226

255

10

94

126

157

189

220

251

283

314

11

103

139

173

208

242

276

311

345

381

12

113

151

188

227

264

301

340

377

415

452

13

164

204

246

286

326

368

408

450

490

531

14

176

220

265

308

351

396

440

484

528

572

616

15

189

236

284

330

377

424

471

519

566

613

660

16

202

251

302

352

402

453

502

554

603

654

704

17

267

321

374

427

481

534

588

641

695

748

18

283

340

396

452

510

565

623

679

735

792

19

298

359

418

477

538

597

657

716

776

836

20

314

378

440

502

566

628

692

754

817

880

21

397

462

527

594 59

659

727 72

792

858

924

22

416

484

552

623 62

691

761 76

829

899

968

23

435

506 50

577 57

651 65

722 72

796 79

867 86

940 94

1012

24

454

528 52

602 60

679 67

757 75

830 83

905 90

981 98

1056

25

550

628

708

785

865

943

1021

1100

26

572

653

736

816

900

980

1062

1144

27

594

678

764

848

934

1018

1103

1188

28 29

616

703 728

792 821

879 911

969 1003

1056 1093

1144 1185

1232 1275

753

849

942

1038

1131

1226

1319

30 a

For SI units, 1 ft = 0.3 m.

b

For SI units, 1 ft 2 = 0.09 m2.