MSS SP 97 (95)

MSS SP-97 95 5770b40 0500393

651

STANDARD PRACTICE

SP-B7 1995 Edition

INTEGRALLY REINFORCED FORGED BRANCH OUTLET FITTINGS0

SOCKET WELDING, THREADEDANDBUTTWELDINGENDS

Developed and Approved by the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, N.E. Vienna, Virginia 221804602 (703) 281-6613

Originally Approved June 1987

COPYRIGHT Manufacturers Standardization Society of the Valve and Fittings Licensed by Information Handling Services

MSS SP-97

95

5770640 0500394 598

P R A CSTTIACNED A R D

MSS

SP-97

An MSS Standard Practiceis intended as a basis for common practice by the manufacturer, the user, and the general public. The existence of an MSS Standard Practice does notin itself preclude the manufacture, sale, or use of products not conformingto the Standard Practice. Mandatory conformance is established only by referencein a code, specification, sales contract, or public law, as applicable.

U.S. customary units in this SP are the standard; the metric units are for reference only.

Non-toleranceddimensions in this Standard Practice are nominal, and, unless otherwise specified, shallbe considered ”for reference only”.

I

Substantive changes in this 1995edition are “flagged” by parallel bars as shown on the margins of this paragraph. The specific detail of the change may be determined bycomparing the material flagged with that in the previous edition.

Any part of this standard may be quoted. Credit lines should read ‘Extractedfrom MSSSP-97-1995, with permission of the publisher, the Manufacturers Standardization Society. Reproduction prohibited under copyright convention unless writtenpermission is grantedby the Manufacturers Standardization Society of the Valve and FittingsIndustry, Inc.

Copyright O, 1987 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printed inU.S.A.

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flSS SP-97

MSS

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m 5770640 0500395

PRACT ST I CAEN D A R D

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I CONTENTS I SECTION

PAGE

1. 2. 3. 4. 5.

SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SERVICEDESIGNATION .................................................................... SIZE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MARKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MATERIAL .................................................................................. 6. DESIGN AND DIMENSION ................................................................. 7. TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TABLE 1 2 3 4 A2 A3 A4

1 1 2 2 2 3 3

CORRELATION O F FITTINGS CLASS WITH SCHEDULE NUMBER OR WALL DESIGNATION O F RUN PIPE FOR CALCULATION O F RATINGS ........ 1 . BRANCH OUTLET HEIGHT . BUTTWELDING, CUSTOMARY UNITS ........... 4 . BRANCH OUTLET HEIGHT . THREADED, CUSTOMARY UNITS ............... 5 . BRANCH OUTLET . SOCKETWELDING, CUSTOMARY UNITS .................. 6 BRANCH OUTLET HEIGHT BUTTWELDING, METRIC UNITS ............, .... 7 . BRANCH OUTLET HEIGHT . THREADED, METRIC UNITS ..................... 8 . BRANCH OUTLET . SOCKETWELDING, METRIC UNITS ....................... 9 .

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ANNEX A . METRIC TABLES ................................................................. B. DESIGN PROOF TEST ........................................................... C. REFERENCED STANDARDS ....................................................

7 10 11

FIGURE 1 . FITTING CONSOLIDATION GAP ALLOWANCE

ii COPYRIGHT Manufacturers Standardization Society of the Valve and Fittings Licensed by Information Handling Services

ISS SP-97 95 m 5770640 0500396 360 m P R A CS T T IACNED A R D

MSS

SP-97

INTEGRALLY REINFORCED FORGED BRANCH OUTLET FITTINGSSOCKET WELDING, THREADED AND BUTTWELDING ENDS

1.

I SCOPE 1

2.2 Design temperature and other service conditions shall belimited as providedby the applicable piping code or regulation for the material of construction of the fitting. Within these limits the maximum allowable pressure of a fitting shall be that computed for straight seamless run pipe of equivalent material (as shownby comparison of composition and mechanical properties in the respective material specifications). The wall thickness used in such computation shall be that tabulated in B36.1Om for the size and applicable schedule of pipe reduced by applicable manufacturing tolerances and other allowances(e.g.,'threadedallowances).

1.1 This Standard Practice coversessential dimensions, finish, tolerances, testing, marking, material and minimum strength requirements for 90 degree integrally reinforced forged branch outlet fittings of buttwelding, socket welding and threaded types. 1.2 Fittings manufactured to this standard are designed to make a fullyreinforcedbranch connection in accordance with applicable piping code requirements,when attached, at anopening of a full penetration weld. in a run pipe by means 1.3 Fittings maybemade to specialdimensions, size, shape, tolerances, or of other wrought material by agreement between manufacturer and the purchaser.

2.

2.3 Any corrosion allowanceand any variation in allowable stress due to temperature or other design shall be applied to the pipe and fitting alike. The pipe wall thickness corresponding to each Class of fitting for ratingpurposes only is shown in Table 1.

I SERVICE DESIGNATION I 2.1 These fittings are designatedby their size, type and class, as shown in Table 1.

TABLE 1 CORRELATION OF FITTINGS CLASS WITH SCHEDULE NUMBER OR WALL DESIGNATION OF RUN PIPE FOR CALCULATION OF RATINGS

I

PIPE WALL FOR BRANCH SIZE TYPE RATING BASIS@)

CLASSOF FITTING Standard Extra Strong Schedule 160 3000 6OOo

Buttwelding Buttwelding Buttwelding Threaded & Socketweld Threaded & Socketweld

NPS 1/93 - 24 NPS 1/8 - 24 NPS 1/2 - 6 NPS 1/8 - 4 NPS 1/2 - 2

Standard Extra Strong Schedule 160 Extra Strong Schedule 160

ofrun orbranch pipe wall thicknesses either thinner or thicker than shown in Table 1 constitutes a deviation from this standard and is provided for in Section I .3.

(a) Note: The use

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SP-97

b) Material Identification: The material shall be identified in accordance with the marking requirements of ASTM Specifications, including Heat Identification.

SIZE

3.

3.1 The branch outlet sizes considered in this standardare shown in Table 1.Size on size fittings shall be limited to outlet sizes NPS 1/ 2 and larger.

c) Class: The Fitting Class - “ S T D (Standard), “XS” (Extra Strong), “SCH 160” (Schedule lm), “3000” or “6000”. Alternatively the designation 3M or 6M, as applicable maybeusedwhere “M” stands for 1,OOO.

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3.2 The run (header) pipe size is limited only by the pipe sizerange listed for each type fitting class.

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3.3 The manufacturers have theoptionto consolidate run sizes for a given branch size for economic reasons, provided the designated consolidation gap distance between therun pipe radius and thefitting inlet radius does not exceed 1/ 16” (1.6mm) - See Figure 1.

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4.3 Where size andshape of fittings do not permit all of the above markings, they may be omitted in the reverse order given above. 5.

4. MARKING

d) Size: The nominal size of the pipe which the fitting’s marking identifies - Run(or consolidated range) NPS X Outlet NPS.

MATERIAL 5.1 The material for fittings shall consist of forgings, bars, and seamless tubular products which conform to the requirements for melting process, chemical composition requirements and mechanical property requirements of the forging product form listed in Table 1, ANSIiASME B16.34, including notes.

4.1 Each fitting shall be permanently marked with the required identification by raised lettering, and/or by stamping, electro-etching or vibro tool. 4.2 Themarking shall include (but itis not limited to) the following: a) Manufacturer’s name or trademark.

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1/16 MAX. (1.6mm)

RunRodius

RadiusRun Contour Rodius

Contour Radius SKIRT GAP

CROTCH GAP

I Figure 1. Fitting Consolidation Gap Allowance I

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MSS SP-77 75 MSS

6.

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5770b40 0500398 L33

STANDARD PRACTICE

IDESIGN AND DIMENSION I

m SP-97

6.3 Threads in threaded fittings shall comply with ANSI/ ASME B1.20.1 requirements for NPT.

6.1 A run pipe having a branch connection is weakenedby the opening made in it. The branch connection must reinforce the opening and restore the original strength of the run pipe. It is the intent of this standardthat these integrally reinforced branch outlet fittings and the deposited weld metal used to attachthe fittings to runpipes contain all the reinforcement required by the applicable piping codes without the addition of saddles or pads.

6.3.1 The minimum wall thickness at the root of the thread at the hand tight plane shall be equal or greater than the nominal wall of the schedule pipe of the appropriate fitting class as shown in Table 1. 6.4 Socketweld fittings shall meet the minimum socket depth, minimum socket wall thickness and socket diameter of ASME B16.11of the appropriate class.

6.1.1 Theadequacy of the design of branch connection fittings may be established by mathematical analyses contained inpressure vessel or piping codes, or at the manufacturer’s option, by proof testing in accordance with Section 7 and Annex B. Records of design or prooftests shall be available at the manufacturer’s facilityfor inspection by the purchaser.

6.5 Thecontour weld bevel angle on the longitudinal section of the fittings shall be a minimum of 35 degrees. The weld bevel angle on the transverse section of the fitting is based on the manufacturer’s standard practice.

6.1.2 The Codes permit a variety of attachmentwelds for thesefittings.Typicalbranch attachments are shown in ASME B3 1.1 and B3 1.3.

7.

I TESTS I 7.1 Hydrostatic testing of wroughtfittings is not required in this standard. All fittings shall be capable of withstanding, without leakage or impairment of serviceability, a pressure equal tothat prescribedin the applicable code or regulation for seamless pipe of equivalent material and schedule listed in Table 1.

6.1.3 Fittings shall be contoured to provide a good fit at the opening in the run pipe. The run attachment weldbevelangledesignwill vary with the size and type of fitting and the manufacturer. The size ofthe run opening is dependent on each manufacturer’s specification.

7.2Proof testing is not required, but when performed to meet the requirements of 6.1.1 shall be conducted in accordance with Annex B.

6.2 Buttwelding endfinish shall complywith the standard weldingbevel and root face of ASME E16.25.

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MSS SP-97

MSS

75

5770640 0 5 0 0 3 9 9 0 7 T

PRACTICE STANDARD

SP-97

TABLE 2. BRANCH OUTLET HEIGHT - BU’ITWELDING, CUSTOMARY UNITS

t \ l I

I

-

~

.. ..

limensions In Inches Tolerances: 1/8 - 3/4 k 0.03‘’ 1-4 f 0.06” 5 - 12 f 0.12” 14- 24 k 0.19” 4 COPYRIGHT Manufacturers Standardization Society of the Valve and Fittings Licensed by Information Handling Services

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OUTLET NPS 1 /8 1 /4 3/8 1 /2 3/4

1 1-1/4 1-1/2 2 2- 1/2 3 4

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PISS SP-77

MSS

95

= 5770640 O500403

558

PRACTICE STANDARD

TABLE 4. BRANCH OUTLET - SOCKETWELDING, CUSTOMARY UNITS

(a)

Note: “ B Socket minimum depths per ASME B161 1

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SP-97

MSS S P - 9 7 95

5770640 0500402 494

STANDARD PRACTICE

MSS ANNEXA

SP-97

TABLE A2. BRANCH OUTLET HEIGHT - BUTTWELDING, METRIC UNITS

OUTLET DN 6 8 10

15 20 25 321-1/4 32 32 1-1/2 33 40 382 38 50 412- 1/2 41 65 44 3 44 80 3-1/2 48 90 514 51 1O0 125 150 200 250 300 350 400 450 500 20 102 600 24 116 Ulmensions In Millimeters Tolerances: 1/8 - 3/4 k 0.8mm k 1.6mm 1-4 5 - 12 k 3.2mm 14-24 k 4.8mm

30 32 33 41 44 51 51 51

32 33 38 41 44 48 51

117 137

119 140

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51 38 62

127 140

44 51 55 62 73

44

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-

84

84

55

73

= 5770640 0500403 320 ~~

MSS SP-97

MSS

95

PRACTICE STANDARD

SP-97

TABLE A3. BRANCH OUTLET HEIGHT - THREADED, METRIC UNITS NPT THREADS PER

B1.20.1

“A” (FACE OF FITTING TO CROTCH)

1

I

40

I

1-1/2

I

35

1

2- 1/2 57

100

Dimensions In Millimeters Tolerances: 1/8 - 3/4 f 0.8mm 1-4 f 1.6mm

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1

I

MSS S P - 9 7

MSS

= 5770640 0500404 267

STANDARD PRACTICE ~

e

95

~

_

_

_

SP-Y7

~

TABLE A4. BRANCH OUTLET - SOCKETWELDING, METRIC UNITS

l

C

I

(a) Note: "

B Socket minimum depths per ASME B16.11

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MSS SP-77

MSS

75

5770640 0500405 L T 3

PRACTICE STANDARD

SP-97

S

DESIGN PROOF TEST

pipe to be used, psi, (determinedon a specimen representativeof the pipe).

B1. Proof tests shall be made as set forth herein as evidence of the adequacy of branch connections employing these outlet fittings.

t = nominalrunpipe inches. D

B2. Proof Test Procedure B2.1 Fittings,representative of production, selected for test shall be identified as to material, grade, and pressure class. They shall be inspected for dimensional compliance to this standard.

=

wall thickness,

specifiedoutsidediameter the run pipe, inches.

of

B3. It is not necessary to conduct an individual test of fittings in all combinations of sizes, wall thickness, and pressure class. A successful proof test on one prototype fitting may representothersimilarly proportionedfittings to theextent described herein.

B2.2 Run and branch pipe sections, assembled with afittingfor test shall be of equivalent material to the fitting and shall have nominal wall thicknesses corresponding to the fitting in accordance with Table 1, and shall meet all requirements of the pipe specification.

B3.1 A successful test on a full size fitting may be used to qualify other full sized fittings nosmaller than one-half nor larger than two-times the size of the test fitting.

B2.3 The test branch outlet fitting shall be welded to the run pipe. The diameter of the branch opening in the run pipe shall not be less than the inside diameter of the branch pipe. The length of run pipe on either side of the weld intersection shall be at least twice the pipe outside diameteror a suitable length to ensure the reinforcing effect of the weld doesnotaffect the prooftest. The branch outlet pipe extension shall have a length at least twice its diameter. The run pipe shall have a bursting strength at least as great as the computed proof test pressure as calculated in B2.4.

B3.2 A successful test on a reducing fitting qualifies: B3.2.1 All similar fittings of thesame branch pipe size which fit larger run pipes than thetest fitting. B3.2.2 Allsimilarfittings with abranch pipe size no smaller than one-half nor larger than two times the test fitting provided the run pipe to branch pipe size ratio is equal to or greaterthan thetest fitting.

B2.4 Hyrostatic pressure shall be applied to the assembly. The test is successful if the assembly withstands, without rupture, 105%of the computedproof test pressure defined below:

P = B D where P = Proof Test Pressure

= the actual tensile strength of the run

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B3.3 Theuntestedfittingmusthavea branch pipe t/D ratio not less than one-half normorethan threetimes the testfitting pressure class. B3.4 Proof tests which havebeen conducted prior to the issuance of this standard, and which areequivalenttotheabove requirements, shall be considered as fulfilling the requirements of this standard provided they are adequatelydocumented.

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MSS SP-97 95 MSS

5770640 O500406 03T

=

PRACTICE STANDARD

I ANNEXC I REFERENCED STANDARDS ANSIiASME B1.20.1 ANSIiASME B16.34 ANSI/ASME B36.10m ASME B16.11 ASME B16.25 ASME B31.1 ASME B3 1.3

1983 (R 1992) - Pipe Threads, General Purpose (Inch) 1988 - Valves - Flanged, Threaded and Welding End 1985 -Welded and Seamless Wrought Steel Pipe 1991 - Forged Fittings, Socket-Welding and Threaded 1992 - Buttwelding Ends 1992 - Power Piping 1993 - Chemical Plant and Petroleum Refinery Piping

Publications of the following organizations appear on the above list: ASME The American Society of Mechanical Engineers 345 East 47th Street, New York, New York 10017

Publications appearing above which have been approved as American National Standards may also be obtained from: ANSI American

National Standards Institute, Inc. 11 West 42nd Street, New York, New York 10036

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SP-97

T,

MSS SP-97

95

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5770b400500407T76

m

LIST OF MSSSTANDARD PRACTICES NUMBER SP- 6-1990 SP- 9-1992 SP-25-1993 SP-42-1990 (R 1995) SP-43-1991 SP-44-1991 SP-45-1992 SP-51-1991 (R 1995) SP-53-1995 SP-54-1995 SP-55-1985 (R 1990) SP-58-1993 SP-60-1991 SP-61-1992 SP-65-1994 SP-67-1990 SP-68-1988 SP-69-1991 SP-70-1990 SP-71-1990 SP-72-1992 SP-73-1991 SP-75-1993 SP-77-1984 (R 1990) SP-78-1987 (R 1992) SP-79-1992 SP-80-1987 SP-81-1981 (R 1986,91) SP-82-1992 SP-83-1987 SP-84-1990 SP-85-1994 SP-86-1987 (R 1992) SP-87-1991 SP-88-1993 SP-89-1991 SP-90-1986 (R 1991) SP-91-1992 SP-92-1987 (R 1992) SP-93-1987 (R 1992) SP-94- 1992 SP-95-1986 (R 1991) SP-96-1991 SP-97-1995 SP-98-1992 SP-99-1994 SP-100-1988 SP-101-1989 SP-102-1989 SP-103-1995 SP-104-1995 SP-105-1990 SP-106-1990 SP-107-1991 SP-108-1991 SP-109-1991 SP-110-1992 SP-111-1992 SP-112-1993

Standard Finishesfor ContactFacesof Pipe Flanges and Connecting-End Flangesof Valves and Fittings Spot Facing for Bronze, Iron and Steel Flanges Standard Marking System for Valves, Fittings, Flanges and Unions Class 150 Corrosion Resistant Gate,Globe, Angle and Check Valves with Flanged and Butt Weld Ends Wrought Stainless Steel Butt-welding Fittings Steel Pipe Line Flanges Bypass and Drain Connections Class 150 LW Corrosion Resistant Cast Flangesand Flanged Fittings Quality Standard for Steel Castings and Forgings for Valves, Flanges, and Fittings and Other Piping Components - Magnetic Particle Examination Method Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping Components Radiographic Examination Method Quality Standard for Steel Castings for Valves, Flangesand Fittings and Other Piping Components Visual Method Pipe Hangers and Supports - Materials, Design and Manufacture Connecting Flange Joint Between Tapping Sleeves and TappingValves Pressure Testing of Steel Valves High Pressure Chemical Industry Flanges and Threaded Stubs for Use with Lens Gaskets Butterfly Valves High Pressure-Offset SeatButterfly Valves Pipe Hangers and Supports - Selection and Application Cast Iron Gate Valves, Flanged and Threaded Ends Cast Iron Swing Check Valves, Flanged and Threaded Ends Ball Valves with Flanged or Butt-welding Ends for General Service Brazing Joints forWrought and Cast Copper Alloy Solder Joint Pressure Fittings Specifications for High Test Wrought Butt Welding Fittings Guidelines for Pipe Support Contractual Relationships Cast Iron Plug Valves, Flanged and Threaded Ends Socket-Welding Reducer Inserts Bronze Gate, Globe, Angle and Check Valves Stainless Steel, Bonnetless, Flanged Knife Gate Valves Valve Pressure Testing Methods Steel Pipe Unions, Socket-Welding and Threaded Valves - Socket-Welding and Threaded Ends Cast Iron Globe & Angle Valves, Flanged and Threaded Ends Guidelines for Metric Data in Standards for Valves, Flanges, Fittings and Actuators Factory-Made Butt-welding Fittings for Class I Nuclear Piping Applications Diaphragm Type Valves Pipe Hangers and Supports - Fabrication and Installation Practices Guidelines on Terminology for Pipe Hangers and Supports Guidelines for Manual Operation of Valves MSS Valve UserGuide Quality Standard for Steel Castings and Forgings for Valves, Flanges, and Fittings and Other Piping Components - Liquid Penetrant Examinätion Method Quality Standard for Ferritic and Martensitic Steel Castings for Valves, Flanges, and Fittings and Other Piping Components - Ultrasonic Examination Method Swage(d) Nipples and Bull Plugs Guidelmes on Terminology for Valves and.Fittings Forged Carbon Steel Branch Outlet Fittings - Socket Welding, Threaded and Buttwelding Ends Protective Coatings for the Interior of Valves and Hydrants Instrument Valves Qualification Requirements for Elastomer Diaphragms for Nuclear Service Diaphragm Type Valves Part-Turn Valve Actuator Attachment - Flange and Driving Component Dimensions and Performance Characteristics Multi-Turn Valve Actuator Attachment - Flange and Driving ComponentDimensions and Performance Characteristics Wrought Copper and Copper Alloy Insert Fittings for Polybutylene Systems Wrought Copper Solder Joint Pressure Fittings Instrument Valves for Code Applications Cast Copper Alloy Flanges and Flanged Fittings, Class 125, 150and 300 Transition Union Fittings for Joining Metal and Plastic Products Resilient Seated-Eccentric Cast Iron Plug Valves Welded Fabricated Copper Sodder Joint Pressure Fittings Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends Gray-Iron and Ductile-Iron Tapping Sleeves Quality Standard for Evaluation of Cast Surface Finishes - Visual and Tactile Method. This SP must be sold with a 10-surface, three-dimensional Cast Surface Comparator, which is a necessarypart of the Standard. Additional comparators may be sold separately. Connecting Joint between Tapping Machines and Tapping Valves

a

SP-113-1994

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request. R-Year upon available substantive reaffirmed standard Prices wilhout change. year Indicates

A large number offormer MSS practiceshave been approved by theANSI as ANSI Standards, published by others. In order to maintaina Single source Of authoritative information,the MSS withdraws ils Slandard Practices in such cases.

MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FllTlNGS INDUSTRY, INC. 127 PARK

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