SSPC Pa - 2 2022
March 31, 2023 | Author: Anonymous | Category: N/A
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SSPC-PA - Approved April 1, Approved
Procedure fo Detemining Confomance to Dy Coatng Thckness Requirements
©2022 Association fo Materials Protectio ad Peoace (AMPP. A igts eseved. eseved. No art of tis u b ication ay e oducd oducd stod stod i a rr rriva ivall systm or trasittd trasittd i ay fom or by ay mans (lct (lctonic, onic, mcanical photo photocopying copying rco rcordig, rdig, o otewise) witout te prior writte writte perission of AMPP. AMPP.
SSPCPA
Procedure fo Detemining Confomance to Dy Coatng Thckness Requiements
s AMPP sadard epesens a consess of hose ndvdal mebes who have reviewed hs docmen, is scope, ad prov provisio isio s Is accepanc accepance e does o i any espect espect peclude peclude anyoe wheter he o se as adopted te sad sad ard or ot fro aufacung aufacung maeing pucasi g or si g prodcs processes o pocedures pocedures not i coforace w w tis sandad. Notin g conaned i hs APP APP sandad sandad is o be be construed construed as gratig any rigt, by imp icaio or ote wse o anufacue se o se n coecon wit any ehod appaaus or poduct coveed by Leers Paen or as ide mnfyn mnfyng g or po poec ecn ng g ayoe agai st lab lty fo ifrngemet of e eter ters s Patet is sandad rep repres resen ens s mi im m reqiremens ad so uld n o way be iterpreted iterpreted as a restrictio c tio on he se of bee bee pocedres pocedres o materia materia s. Nee is this sandard neded to appy n all cases reatg to te sbject np redictab redictabe e cicustaces cicustaces ay egae he se fess hs sadard acceps specfc instaces. AMPP assumes esponsibily fo the i terpre terpretaio taioby o APP use of i tis sa dard by of ohe parties ad esposibiity for oy tose o ofcal AMPP nepeaons ssued acco dace w its goverig goverig proced procedes es and polcies wc precde te issance of iterpretations o ns by idivi da vo tees Uses of tis APP sandad ae esposibe fo evewng appopriate heat safety eviroenal ad regulaoy documents ad for deemnng te ir applcabiy i elaon to to hs stadad por to s se. Ths APP sanda sandad d may ot necessariy addess all potetia healh ad safety poblems o eviromenal azards associated wih te se of maeas e qupme t ad/or opeaons opeaons deailed or referre referred d to wi ths standad sers of tis APP stadard stadard ae aso esposibe fo estabishig appopae ealth safety and eviroenal protectio pacices i consutaton w appopae egatory atoies f necessary, o acieve complance wit any existing applicable egatory reqe ens po o the use of hs sandard CATIONA RY NO CE AMPP stadads stadads ae sbject sbject to perodc evew evew and may be revised or whdaw whdaw a any time i acco accordace rdace wh AMPP echnca echncall commi ee ee procedes procedes APP req req ires tat actio be take to reafm reafm evse o wtdraw wtdra w hs sandard o lae han fve fve years years from from he date of i itia pb icatio ad subseqety fro he dae of eac eac reafiraon reaf iraon or evson The use s caoned to oban te laes edi tio Prcases of AMPP sandards may receve receve crret on aHouson, sandards and 77084-5 ote APP/NACE/SSPC pubcations by cotacig APP Csome Sppo 1 5835 Pa Pnformatio a e Place, exas exas 45 (e (e +1 2 8 -228-6200 em ai customespprt@am.org customespprt@am.org . Document Histor y 2022-0 202 2-04- 4- 2 Revised s ed by SSPC C3 2 201 5-01-26 Revised s ed by SSPC C3 2 201 2-05 2-05-0 -0 Revised by SSPC C3 2 2004-05-04 Revised by SSPC C32 996996-0606-0 0 Revised by SSPC C32 1 982-1 -0 Revsed Revsed by SSPC SSPC C.32 1 973-0 973-09-01 9-01 : Issued by SSPC SSPC C32 Fi Tcess Tcess ea easeen seen AMPP values yo ur input. To provide feedback feedback on thi s standard, standard, please contact: contact: standards
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Procedure fo Detemining Confomance to Dry Coang Thckness Requirements Seco
Scope
Seco 2
Refeenced Sandads
Seco 3
Defios
Seco 4
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6 6 7
3 1
Gage Readg
32
S po po t Me as as ur ur em em e e t ? ?
33
Scan Sca nng ng Ba Batc tch h M eas easr rem eme e ?
34
Aea M e a s u r em em e et . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
35
S ca ca n n n n g Aea M ea ea su su re re me me . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
36
Cetif Ce tified ied Sada Sadads ds 7
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7
Descption of Gages 7 Gage ypes 7
41 42
ype y pe agec Pul-O Gages 7
43
ype 2Electronic Gages ...................................................8
Sec Se co o 5
Caiba Caib ati tion on,, Ve Vef fica ica o o of Acc ccur urac acy y and Adjus justme tmet t .. .. . . .. . .. . . .. . .. .. .. . .. .. . .. . . .. . .. .. 8
Sec Se co o 6
M eas easu uem eme ett Proced edr re e ype 1 G age ages s 8 8
Sec Se co o 7
M eas easu uem eme ett Proced edr re e ype 2 G age ages s 9 9
Seco Sec o 8
Reqed Reqe d mber of Measr Measremes emes fo fo Cof Coforma ormace ce o a ckess Spec Specfc fcat aton on 9
Seco 9
Cof Co fo oma manc nce e o Spec Specif ifie ied d Thickne c kness ss
Sec o o
Repo 1
Sec o o 1
ot otes 1 1
Over co coati ng ng 1
12
Cor Co re ec cn ng g for Low o High h hc ckn knes ess s 1
Appedx 1
u mecal Exampe of Ave Aveage age Tcess Measemen and and I sra sraon on of te Proc Procedue edue fo fo Dee Deeminng minng he Mag ude of of a ocofomig ocofomig Area Area No manda mandaor ory) y) .. .. .. .. 2
Appedx 2
Metod Met ods s for for eas easng ng Dy Dy Flm Ticn Ticness ess o o S See eell Beam Beams s (Girdes (Girdes)) Nomadaor Nomadaory y . . .. . . .. . . .. . 5
Appe dx 3
Metods for eas ng Dy Fl m Ti cness for a Laydown Laydown of Beams S Beams Sc cu ua a Seel, Seel, ad Misce Miscelaeo laeos s Pa Pas s afe afe Sop Coatng Coatng No manda mandao ory ry)) . . .. . . . . .. . 8
Appedx 4
Metod Met od fo fo easrng Dy Dy Film Thickness Thickness o Coated Coated Se See e Tes estt Paels Paels Non manda mandaory ory . .. . . .. . .. . 9 A41
Pa ne ne l Si Si ze ze 9
A42
Poce d d re re 9
A4 3
M n n im im um um T i i c c ne ness 9
A4 4
M ax ax im im um um T i i c c ne ness 9
A4 5
R ej ej ec ec o o 9
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Appedx 5
ehod for Measuig Dry Fm cess of n Coai gs o Coaed Coaed See See es es Panes Panes at Have Bee Abrasive Bas Ceaned (omadatoy) 1 9
Appedx 6
ehod for Measuig he Dy Flm Ticness of of Coatngs on Edges with ype 2 G ages (omadaory 20 20
Appedx Appe dx 7
ehod eh od fo forr Measuig Measuig Dry Dry Fm cess cess o Coa Coaed ed See Seell Pipe Pipe Exte Exteor or (o madato madatory ry 20
Apped App edx x 8
Example Exa mples s of of h he e Ad Ads smen men of ype 2 Gage Gages s Usng Usng Shms (omadat (omadato oy) y) 22
Appedx 9
A8
S i g g le le-P o o t t A d d s s m m e e 22 22
A 8 8 2
wo-Po n n Adj us us tm tm e e t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
A8 3 3
S mo moo t t S rf rface Adj s s m m e e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Pec P ecao ao Rega Regadig dig s se e of the the Standad Standad fo Coang Coang Fai e vestig vestigations ations Nonmandaory) Nonmandaory) .. . .. . 23
Appedx 1 0 Pocedue Pocedue fo Obaii ng a Greaer Poplao of Thicness easremes o Large Fla Pae Beams and Ppe Spoos sig Type 2 Gage Conti Con tiuo uos-R s-Rea ead/ d/Sc Scannig annig Tec eco olog logy y (Non (Nonmand manda ao oy) y) 24 Appedx 1 1
ehod eh od for Measuig he Ticess of lnt mescent Fepoo Fepoofing) fing) and Cryogenc S p Po Cryogenc Potec teco o Coatngs Apped to Load-B earig Strcral See Se e embe embes s Fe Fe Dvisions Dvisions Ppewo Ppework rk and Ve Vess ssels els//anks (onmada (onmadato toy y)) .. .. .. .. .. .. .. .. .. 29 A 1 . 1
Scope
A 1 . 2
Refe e ec ed ed S a a da da ds ds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
A1.3
Def ni ni titi on on s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
A1 4
Dry F Fm m c c es ess s Sp Spec ecif ifc cat atio ion n Pa aa ame mee ers rs .. ... . . ... .. . .. .. .. .. .. .. . .. . . ... .. .. . 3
A1 .5
Prep ar ar a a o o fo sp spect o on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
A1 .6
F sp spec o o Poc ed ed r res . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
A1 .7
Conflict R es o l u ti on on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
A 1 8
R ep epo rt rt i i g 36
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Figres Fig re A1 A1
e ei ic) c) Part A of St Stu uct ct e e 1 3
Fig re A1 A1
US Cus Custo tom m Pa "A of S S c cu ue e 1 4
Fig re A1 2 2
Dee De erm rmn nng ng Ex Exte ten n of of oco ocoffo omig mig Are Area as 1 4
Fig re A2
e Sfaces of a Steel Beam 1 1 6
Fig re A1 02
O b bai aing ng Scan Scang g Ba Bac c M eas easur urem eme es s o Plate 25
Figre A10 3 1
Scang Sca ng Ba Bac c F F Mea Measr srem eme es s o a I-Bea I-Beam m op V Vew ew . .. . . .. . . . .. .. . .. . . .. . . .. . . 26
Figre A 10 32 Figre A 033
Sca Sca ng ng B Bac ac F F Mea Measr srem eme es s o a I-Beam I-Beam P Pof ofie ie Vie View) w) .. .. . .. . . .. . . .. . . .. . .. . 26 Sca g Bac Bach h F Measuem Measuemets ets o a n -Beam ( p Vew/Bo e w/Boom-Side om-Side e Measremes Measremes.. .. 26
FigreA100.1
Four evey spaced sca sca ng batc measure measuremets mets o a pipe diam ete ete p o o 30 30 cm cm 12 i) ad gre grea aer er t tan an 3 3 m (10 ) i leg legh h .. .. ... . . . . .. . . ... .. .. .. .. . 28
FigreA100.2
Six evenly spaced scan scan i g bac measuements on a pipe d iam eter 36-60 3660 cm (4 o o 24 24 n) and and gea geate te ta tan n 3 m 0 f f engt engt 28
Figre A 10 03:
Eight evey spaced scang batc measuremes o a pipe diamete geate ha 60 cm 24 n) and greate ha 3 m 0 f) n engt 28
FigreA11
O pe Pofie Steel embes 34 34
Figre A1 2
Cose sed d Pr Prolle e S See ee embe embes s 34 34
Figre A1 3
S te tee P la lates 34
Figre A1 4
Compone Comp onet t ames ames of Gird Girdes es I-se I-sec cos, os, ee Se Sec cios, ios, ad ad Canels Canels 34
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abes abe
Coaig hckess Restrco Levels
abe A2. 1
Daaseet fo fo Recordi Recordi ng Spot easu eme ements nts a nd Aveage Aveage OFT Vae fo he 2 Su Sufaces of of a Beam Beam o o G ider ider 1 6
abe A22
mbe of Spot easuements eeded on Each Su f fac ace e of a Beam fo a Fll fo Fll or a Re Rep pes esen ena ati tive ve OFT De Dete temi mia ao o 1 7
abe A7
mbe ad Loca Loca os os of Sp Spot ot Me Meas asu uem eme ets ts Pi Pipe pe Spo Spoos os 2
abe A0 .
mbe of Scang Bac Bac Measr Measremes emes Needed o Eac S a ace ce of a Beam Beam fo fo a Ful o a Repr Repres ese eta ta ve ve OF OF De Dee emi minatio n ation n . . .. . .. .. .. . .. . . .. . . .. . .. . . 27
abe A 0.2
mb e ad Locaos Locaos of Scan ng Batch ad Area Area easremes Pipe Spoos L oge Than -3 M (- 0 F ) 28
abe A
Firep Fir epoofg c c es ess s Re Rest stri rico c o Le Leve vels ls 3
abe A 2
Dry Fim ckess easements on See embes 33
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SSPCPA ©2022 Associatio for Materials Protectio ad Perfomance (AMPP) All ights eseved. 5
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10
Section 1 : Scope 1.1
s stadard descrbes a pocedure fo deteming sop or field cofoance to a specfed coatig dry film tcess ( DF ange on feros feros a nd on-fe on-ferou rous s mea s bsr bsrate ates s usig two ypes of of nodestructive nodestructive coatig tcess tce ss gages (Type (Type mageic pu-of pu-of and Type 2 elec elec oic oic descibed descibed i ASM D7091
1.2
s standard defies a pocedure to detemi detemi e weher coatngs coatngs confor conform m o te mi m m and te maxm m tcess specifed. See N o o e 1 . 1 fo fo a examp e of a poss be mod fca fcaton ton wen meas ng d ry flm hic ess on ovecoaed suaces
1.3
s docmet docmet co coai ai s te followig on-madaor on-madaory appedces. Appe Appedces dces 2 3 4, 5, 6 7 0 ad 1 become man datoy whe nvoked by he poec poec specificaio o r if the conracor o labo a atoy toy as agreed n wring wri ng o compy wit heir povsos povsos
1.4
n ndix p dix 1
umerical Exaple of Average Ticness Measuremet and Illustaion of the Procedre for Determi Determi i g te M agnit de of a N onconf onconformng ormng Aea Aea
n ndix p dix 2
Mehods for for easug Dy Flm T icess o Seel Beams ( Girdes)
n ndix p dix 3
Mehods for for easng Dy Flm Thickness for a Laydow of Beams, Structral Steel and Miscella eos Par Pars s afe afe Sop Coating
n ndix p dix 4
Mehod fo easng Dy Flm Thicness o Coated See Tes Paels
n ndix p dix 5
Mehod fo Measng Dry Fl cness of n Coatigs on Coaed Steel Test Paels ha Have Been Abasve Abasve Blast Cl eaed
n ndix p dix 6
Mehod fo Measng the Dy Fi m hckess of Coatigs o Edges
n ndix p dix 7
Mehod fo Measng Dy Flm Thicness o Coate Coated d See P pe Exero Exero
n ndix p dix 8
Exampes of he Ad Adjustme justme of Type Type 2 Gage Gages s si g S ms
n ndix p dix 9
Prec Pr ecation ation Regardng Use of te Sta dard for Coatng Fal re Invesigaos
n ndix p dix 10
Procede fo Obtanig a Greater Popua Procede Popua o ofhckess Measremes on Pate Beas ad Pipe Spools Usng Type 2 Gage Connous Read/Scannig ecology
n ndix p dix 11
Mehod fo Measuig the hckess of lnescen (Fireproong) Coatngs Appied o Load-Beag Strcural Steel Membes Fe Dvs ions Ppewo and Vessels/ Vessels/ans ans
Units of Measure: s sandad makes se of both the AST S 0 nternationa System Unts (S ) ad U. S Cstoary ns Te measuremets ae ot exact exact equi valets; herefore herefore each system ust be used nde
pendely of he oe Aso a lde ( - is used o indicae appoxmation
Section 2 Referenced Standards 2.1
e lates sse evso o aendet of he refereced sadads i efect o he dae of ivation o bd sal goven uness ohewse specified Sadards aked wh a astesk ( ) are refeeced oy i te Noes which are not eqiemens of is stadard *
2.2
f here s a conflic beween te requiremes of ay of he cted refeece sadads ad is standard te requiremes of hs sandad sha peval
,
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2.3
APP/SSPC APP/SSP C Sa dard www.aog *PA Guide 11
2.4
2.5
AS Iteaoal Standards wwwastmog ASTM 0791
Sadard Pactice for ondestrucive Measemen of D Fm icness of onmagetc Coaigs Apped o Feros etals and Nonmagneic, oncodctve Coaigs Appled o on-Ferrous etals
IEEE/ASTM IEEE/ ASTM SI 1
Ameica aional Standad fo etc Pacice
Inenationa Ogazation fo Standardzaton Sandad htt//www.so.og/ *SO 1984
2.6
Poecng Cores Edges Crevices ad rrega Steel Geomees by Sipe Coang
Pans ns ad va rshes Coosion poteco o of stee stee sctues by potec potecv ve e pai sys sys tems Measureme of, of, ad acceptance ctea ctea fo fo he hckess of dry fms fms on rough sfaces
U. S Mi ita itay y Specf Specfca caton ton tts://quickseac dla ml/qsSearcasx * ML-PRF23236
Coag Sysems for S p Strucres
Section 3: Definitions 3.1
Gage Reading A snge nstumen readg readg
3.2
Spot Measurement he average average of hree gage readi readi gs made whi a 4-cm 4-cm (1 5-nc diamete circle Discussion: Ac Acqs qs ition of moe ha ree gage eadngs wihn a spot is pemited. Any u sua ly gh o ow gage eadings a are o epeated consistenty are are discade d The average of te accepabe gage readigs s te s po measreme
3.3
Scanning Batch Measurement The mea of a mn mm of 1 2 FT readi readi gs ad p o 24 eadng eadng s wou lfig lf ig he probe from from te coaed su ace defiton app ies to Apndix 0 only).
3.4
Area Measurement Te aveage of fve spot measremens obaied ove eac 0 m (00 coated srface or portio teeof
3.5
Scanning Area Measurement: Te sampe mean of fve (or as ohese defied i Appedx 1 0 scani g batch m easemens obtained over eac 1 0 m (1 00 f) batch f) area of coate coated d suface suface o r portion teeof (defnition apples o Apdx 10 oy
3.6
Certified Standards Coated o plated meta plaes accompaied by an ucoated plate for zeo efeece wit assged vaes taceable o a aioal metrology istution Also ucoated shms of flat pasc see wit assigned vaes traceable to a aioal meoogy inston
f) area of
Section 4 Descrip Description tion o f Gages 4.1
Gage ypes e gage type type s detemied by he opeatig pi cpe e mployed n meas urig the coang hic ness ad s o deemined by te mode of data eadot e dgital or anaog
4.2
Type 1 Magnet Magnetic ic Pull-O Gages Gages Fo magnetic pl-of gages, a permanen magnet is brogh nto direc cotac w he coated srace The foce ecessay o pu te mage fom he suace is measued and nter peted as the coatng ticess vae on a analog dal scae) on te gage Less foce is eqied to emove he maget fom a hic coating Te gage scae is non-near.
21
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4.3
Type 2 Electronic Gages: An eectronc gage uses eectronc ccy to convert a eference sigal io coaig hicness Some electronic gages are are eqi pped wit scann ig ecnoogy -
Section 5 Calibration, Verification of Accuracy and Adjustment 5.1
ee operaoal steps are necessay necessay to to ens e accurate accurate coaig hicness meas reme: cabati on ve ification of accuracy and adjsme hese seps sall be compeed before takng coatig ticness mea semens to determe cofomace to a specfed coatg ticess age Vefcao of accacy sha be peormed sng ceified standards ype 2 gage ad smen o o compensae for for characeris characeriscs cs icl dn g bu o mited to substate meagy, geomey tcess ad rougess sal be perfomed usig ceified sm s Te measred s ms commony su ppled w Type 2 gages are also also acce acceptabl ptable fo gage gage adjustment
5.2
Gages sha be cal bra braed ed by the the eqp ment ma nufac nufacure urer, r, heir ahorized aget o an accedited accedited caibation aboratoy A tes certifcate or other documenation sowng traceablty to a aonal metrology sution is required Tee s no standard time nteva for re-caibation nor is oe absoluey required Caibation ievals are saly estabse d based pon experence experence ad te wo environme o wen specified by pro pro cemen documes or by e gage se s qua ly syste syste A oe-yea calibrao i erval s a ypical c al sartig pon t suggesed suggesed by gage ma fact facters. ers.
5.3
o gad agais measng wit a naccurae gage gage accuracy sha be veified at a mnimum of te beg ng ad ed of each wok shft shft according according to he procedues procedues descbed n AST 7091 o te gage manfacres nstrucios e ser is advsed to veify gage accacy dug measement acqsition eg whe areadig large nmber measuremets being If hecked gage is dopped o sspected of gviouy) g erroneous s du gofhe work shif sae accura accuracy cy obtained sha be rechecked reche
5.4
Record the seial um umbe be of e gage, the refeece refeece stadad used, u sed, the stated stated tcness of e e eference eference standad as well as the meased ckness vale obtaed ad e method used o verfy gage accacy f the same gage refeece sandard ad mehod of veifcaton ae sed thougou a ob ey need to be recorded oly once he stated stated vaue of the stadad and the measu red value m s be ecoded ecoded each i me accuacy accuacy s verfied verfied
5.5
f he gage fai fai s he pos-measuremet accuacy accuacy verf verfcaio caion n check, a measuemets acqured si ce the as accuracy veificao ceck ae suspect he even of physical damage wea, or high sage, o afe an esab es ab ished cali brao nterva nterva te ga ge sal l be receced receced fo accu accuacy acy of measemen f te gage i s o measng accraey accraey it shal n ot be sed n i s repaired and/or ecalbrated ecalbrated usall y by e gage manufac manufac ter).
5.6
A ype gage hat does no meet the mafacte's sated accuracy whe vefed o certfed sadards cannot be adsed o corre correc c fo te o-of o-of-t -tolerance olerance codio ad sall o be sed unti is epared ad/ or e-calibraed e-calibraed typcally by the gage manfac manfacre. re. Any manua adustment of hese gages wll i m the OF range fo fo wch te gage w ll provde accate eadngs; here herefore fore adsmen of he he gage s o permtted Femore the app lcation of a snge "co "coeco econ n vaue epreseng te fll range of te gage to compe sae fo a gage that is not me asurig accuately is not appropiate sice t e gage scae s on- liea
Section 6: Measurem Measurement ent Procedure Procedure - Type Type 1 Gages 6.1
Vefy yp ype e gag e accacy s ng certed certed coaed mea paes havng at leas one tces s va e whi t e expecte exp ected d rang e of se Un ess explicily app ro roved ved by te ga ge man fac factre tre cetified cetified sh ms of plastic or of on-magec meas ta ae accepabe for verfyig te accuracy of Type 2 (elecoic gages sall o be sed fo verf verfyi yi g he accacy of Type gage s.
6.2
orde o compensate fo ay efec of te sbstrae sef ad sface rougess oba one eadng from te bae pepaed subsate at each of a mnimum of ten 0) abitraiy spaced locaos ad calcuae te aveage vae s vae epreses he efect of the sbsate/sace rougness on a coatng ticness gage Tis aveage vae s te base meta eadng BMR)
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6.3
Mease te DF of he coating a he number of spos specified i Secton 8
6.4
Su btrac btrac te BM R from e gage readg o obai he hckness of te te coag
Section 7 Measurem Measurement ent Procedure Procedure - Type Type 2 Gages 7.1
e manfacure ma nfacures s of ype 2 (electo ic gages prescribe d ierent meods of adjs adjs ment to measure dy film tcess over ogheed saces Adjus te gage accordng accordng o te manfact manfacter's er's insrcos sng one of te mehods descbed descbed ASM D 7091 o pdx 8 of ts standa standad d
7.2
Mease te DF of he coating a he number of spos ad areas specified i Seco 8 NOTE Gages ta employ place ad emove" ecol ecol ogy or scan g teco ogy may be sed o cay cay ou te procede olned in Section 8
Section 8: Required Numbe of Measurements for Conformance to a Thickness Specification 8.1
Number of Measurements Repeated gage eadings eve a pons close ogeher, ofen difer due to small sface egularites of he coatig ad he substae Teefore a mnmm of hee gage eadngs sha be acquired fo eac spo measemen of the coatig Fo eac ew gage eadng move he probe o a ew ocation witn witn a 4-cm 4-cm (1 .5-n ) dameer cicle def def i g te spot Wen scanni g echnoogy is used, move
te probe a cicu cicu a moo moo witn a 4 4 cm 5 n d ame ameer er area area ta defies defies te spot wito witout ut lfi g te probe from from te surface surface Discad ay us ally hg or low gage eadngs a ae not epeaed epeaed consisenty consisenty e aveage of the accepabe gage eadngs s the spo measremen 8.2
Uless oherwse specfed i he pocreme documens pojec specfcao), an aea measremen is ob taned by acq acq ng fve sepaa sepaae e spo measuremes average average of of e gage readi readi gs described n Section 8 1 randomly spaced tho gho each each 0-m 00 f f aea o be measued ad repesenave of te coated coated sface sfa ce The five spot measemens measemens sha be made fo fo each 0-m ( 00 f aea as foows: 8.2.1
For aeas of coatig no exceeding 30 m 300 arbrarly select and measue eac 1 -m (100 f) area.
8.2.2
For aeas aeas of of coang greate ha ha 30 m (300 ) ) ad no exceedi g 1 00 m 1 000 arb ariy seect seect and mease tree 0-m 00 areas.
8.2.3
For areas of coaig exceedng 00 m ( 1 000 f, abtraly seec ad measue te fist 100 m 000 f f as sa sated ted n Section 82 2 For each each additiona 1 00 m (1 000 coae coaed d area o ncreme eeof) eeof) abitaiy seec ad measre o e addoal 1 -m -m 00 area. OE: Alerae coang icness measement feqeces fo plate beams ad ppe usig pndix 1 0 gages equpped wih coniou s ead/sc ead/scang ang ecnoogy are are provded
8.3
Nonconforming Areas: If te te coati g tc ess for any 1 -m 1 00 aea s ot n comp i ance wih h te contrac contr ac docmes he procede descbed descbed ee s all be foowed foowed o assess assess e magni tde of te onco fomig ticess 8.3.1
Detemi Dete mi e the spo DFT at at 5-m 5-f) inervals n eig equa y spaced spaced decos radatig radatig otwad from otwad from he onconformng 1 -m ( 1 00 area If here here s no p ace o measre n a given di re reco co he o measuremet i n hat dection s ecessay ecessay Acqe Acqe spo measuremets n each direco p o te maxmm suface area coaed dring te work shft) l two consectve cofoming cof oming spot measemens measemens ae acq acq ed i ta decto or l no addoa measremes are possible Acceptabe spot measements ae dened by te mimum and maximum values n he contrac documens No alowace s made for vaia spo measuremets as is he pactice whenn detemi ng the are whe area a DF An An i ustra ustrao o of his poc pocedre edre s show n Fgure A 1 .2 .2 SSPC-PA - ©2022 Associatio
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O complex srcues srcues or in othe cases cases wee acquiri ng spot measremens at 1 .5m 5-) neals is o pactca spo meas ements shall be peformed peformed on epeatng stucral uits o eemens of suctral is Ths method sal be used wen he agest age st dmesion of the i i s ess than 3 m 0 Acquire Acquire spot measremes measremes on repeaig srcua unts o eemens of sctua uns u wo cosecuive unts n each di reco eco a e confo conformig rmig o n her here e ae o mo moe e s to est
8.3.1.1
-
8.3.2
8.4
No-complat areas sall be demacated usig removabe maig materals ad sall be doc meted. Al of the area whi 1 .5 m (5 ) of ay on-compi an spo measemen sha be des gnated as no-complia. For a give measreme dreco or measuremet any compian aea o precedig precedig a no-complat aea or n sal be desgnaed desgnaed as sspect sspect ad as suc s subjec to e-ispec on afer correcv correcve e me asu res are perfomed perfomed (see No Noe e 1 2 2))
pndices 2 togh I ad pndices 0 and 1 pov povde de specfers specfers wit op tiona alternativ alternatives es fo defi defi g th e area sze sze as well as t e num ber ad feqency of spot measemens to icl de n proect proect specificaios as appoprae fo e sze ad shape of he em o structre o be coaed
Section 9: Conformance to Specified Thickness 9.1
A mi i mum and a maxim um hckess are normally specfed specfed for eac eac lay laye e of coat coatng ng If a snge t icness value is specified and te coatig mafacter does not provide a rec recommeded ommeded age of icness icness he te mi m m ad maxmm tcess fo fo each coaig laye sal l be ± 20% of te saed va va e
9.2
ab e provides five thcness restrictio level s Leve is te most escv escve e ad does o allow for for any any dev atio of spot o area measremens from he specified miimm ad maxmum hcness whle Leve 5 is te east escve Dependng on te coatig ype and te prevaiig sevce envonmet he spece selecs te dy flm tickess estcon eve fo a give poec If o esrcio level is specified, he Level 3 is te defat def at t s poss ibe o specify a maxmm hcness tresold fo Level 5 Spot o Area Area measuemets fo fo some genec poduct ypes ypes ad service envonme ts Table 1 Coating Thickness Restrction Levels
Thickness
Miium Maxiu
Miium Maxiu Miium Maxiu
Miium Maxiu
Miium Maxiu
9.3
Gage Readig
Spot Measurement
As specified
LEVEL 1
Unesticted Un stic stictd td
As spcifid
LEVEL 2
Unstictd
Unesticted
I
Unstictd
As spcifid %
of aximum
(efalt) 8% of ii
LEVEL 3
Unesticted Unstictd
%
of aximum
LEVEL 4
Unesticted
8%
%
of mii of aximum
LEVEL 5
Unesticted Unesticted
8%
of ii
Unesticted
Area Measurement
As specified As spcifid
I
As spcifid
As specified
I
As spcifid
As specified As spcifid
As specified
As specified Unesticted
Fo te pupose of fia l accepace of te toal dy film hic kness te c m ave hicnes s of a coang layes sal be o ess an he cmuatve mimm specifed ticness ad o geae ha the cmulative max mm specified tcess. 2-2022 © Associatio
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Section
10:
Report
e following items sha be reported:
10.1
e type type of nstrme used icl dn g manfacre manfacre model n umber serial n mber and date date of calbra calbrao o
10.2
e type of certified sadard sed to veify gage accracy, icluding mafacter mode nmber serial mbe, ad icness values
10.3
e tcess of he measued sim(s) sed o adust a ype 2 gage
10.4
e aveage aveage BM R if appropiate. appropiate.
10.5
e spo ad area measemens
10.6
e gage operato ad dae dae of measuremet acqusiti acqusiti on
Section
11:
Notes
Noes ae ot requiremes of his sadad.
11.1
Overcoating: Maieance panig ofe ivolves appicaio of a ew coang ove an exisng coag sys tem I ca be very dfc to accatey measue te OF of his ewy applied coating usig no-destuctive mehods mehod s First, access to he profle profle s not avaa avaa ble compom sig t he accac accacy of te te BM R or te adjsmen adjsmen of a ype 2 gage. Secod, uneveness n e OFT of te exisng coang ecessates careful mappng of te "before ad afer OF readigs Ts nevenness also adds o he statsical vaatio i rying o esabsh a base OFT eadng to be subtracted from te fal OF A pant ispecton gage (sometimes called a oke o PG gage wll give acc acca ae e OFT measemens bu requires hat an an n ciso be made ho gh e coating (ovec (ovecoa oa ony o oa oa sysem, sysem, so each measremen site wil eq e repair repair A pracca approach o montorg OFT wen ovecoatng s o compute e OF sg we lm hicness WFT readgs te percen volume solds of he coag beg applied, and ay ie addio as shown ee OF = Measued WF x % Volume Solds o OF = Measued Measued WF x % voume soids+ 1 00 00% % % thne added) added) f the OFT of the exsig exsig coa coatng tng is ot too uneve n o eoded te aveage aveage O F of e existng coa coaig ig ca be meased per ts sadard to esabls a base OF Tis base OFT ca the be sbtraced from e toa OF to soae te icness of he overcoats
11.2
Correcting for Low or High Thickness: he specfer sould specc speccaly aly stae stae he metodology o correc correc te applied and cured flm for ow o hg tcess If is infomao is o cotaned i te speccaton ten te coang mafacter's mafacter's nstrcos sou d be followed followed
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Appendix 1 Numerical Example of Average Thickness Measurement and Illustration of the Procedure for Determining the Magnitude of a Nonconforming Area (Nonmandatory) Appedx 1 s o a madaory par par of ts standad. Example Using SI Units:
e folowng nmeical example is peseed as an llsation of Secion 8. 8 . he example s based on a Leve 3 Re sction o n defat Suppose te coa coaed ed area s 30 m n area Dvde he aea nto hee hee eqal pa pas s eac beig 1 0 m Pat A - 1 O m Pat Pat Pa t B - 1 0 m Pat Pa t C - 1 0 m Fst measu re he he coating i cness o Par A Ti s volves a east 5 gage readi gs w a ype ype or Type 2 device see igure A1 Assume e specfcaton cals fo 64 µm mimum hckness he coaig ticness fo area A s ten the average of of he fv fve e spo measemens made o aea A amey 67 µm Spot 1 64 m Spot 2 75 m Spot 3 53 m Spot 4 75 m Spot 5 66 m Average 67 m he average 67 µm exceeds the specified mnmm of 64 µm and hs satsfes he specifcation Next determe f the lowes spot measreme, 53 µm, s whi 80% of he speced mnimm hickness based on Coatig Ticness Restc Rest cio io eve 3 or he def defaut aut ). Eighty pecet pecet of of 64 µm is 51 m (0. 80 x 64 = 5 . Atoug a meas emen of of 53 µm s beow the specfe specfed d mi mm s sll witn 80% of of ta mi m m so the specfc specfcao ao is sasfie sasfied d Tee are id vda l gage eadn eadn gs of of 47 m at Spot Spot 5 and and 45 m a Spo Spo 3 boh of which are cleary cleary less less ha 51 µm s is allowed because only the aveage aveage of the tee reading reading s e. the spo measement) must be greate greate ha or eqal o 5 m . Sce he stucte sed ts exampe s 30 m te procede used to measue te fm hckness of par A ms be appled to bot pa B ad part C Te meased ticess of pa B ms exceed exceed te 64 m specfied mi imu m as must he thckess of pa C. he hickness of tis enred30-m s cue at leas 45 ndfom ivdua gage eadngs bestrcure ae from fr om 1 o5 moio spot measuremets measureme ts are cacuate Te five fivscue e spo measremes fom each 0m parms of he str cure arewich are used to calcuae te hickness of hat pat.
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GAGE READINGS
St1 Sp t2
90 9 0µm
66
66µm
4 mm
-2 M
�
B ��:
7 6
•
5 64µm
Spo t3 t3
•
Spo
4 po t 4 Spo
•
•
m 6µm 6 6µ
Avg. 75µm
Par "B
47µm
i
µm
8 79 ?µm
S Figure A1 (metric): Part "A of Structure (area is -10 m2). Example Using U.S. Customay Units Suppose he coated area is 300 2 n area Dvide he area nto hree eqa pas eac beig 100 . Pat A -100 f2 Pat B 100 f2 Pat C 100 f2 -
-
-
Fst measure he coating icness o Par A. T is volves a east 5 gage readi gs w a yp ype e or Type Type 2 device (see Fi gue A1 ) Assume te specfcao specfcao cals for 25 ml s mi i mum tcess he coang tcess for area A s the he average of he fve v e spo measemens made o aea A amey 2 6 m s Spot 1 2.5 mis Spot 2 29 mis Spot 3 2 mis Spot 4 2.9 mis Spot 5 2.6 mis Averag Ave rage e 2 6 mi s he average, 2. 6 ml s, exceeds te specifed mn mm of 2.5 m ls and t s satsfes satsfes he specfcao specfcao Next determi e f the lowest spot measremet 2. mls, s withi 80% of te specfed miimm hcness (based o Coag ickess Resc Res con on Leve 3 o he def defa a t Eig ty pecen of 25 ms s 20 mis (080 x 25 = 20 Alhoug Alhoug 2 1 mls s beow beow te specfed spec fed min im m it is stll whn 80 percet of of that mii mum so e specifca specifcatio tio is satisfied satisfied The re ae id ivid a gage readngs of of 8 mls at Spot 3 and 8 mils a Spo 5, boh of of whch ae cleay cleay ess ta 2.0 mi s. i s is alowed becase only e aveage aveage of e tee readi readi gs ( i. e. te spot measuemet) mst be greae greae an o equa o 2.0 m is .
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St
GAGE READINGS
1
Spo t
3.5 m mililss
26
•
• Avg 2.9 mils
-10 f
Spo 13 13
�
B 2 � u:�
@
St
Spo po t 4
•
ms 6 3. 31 29mils .
•
Part"B
.8ils
Avg H mis
- 1 0 f
Figure A1 (U.S. Custom): Part "A of Structure (area is -100 2). sate ates s te proce procede de descrbed n Secon 8.3 of hs sadard for deteming he magnitde of the Fg re A 1 .2 llu s oconformig hickness
Figure A1.2: Determin Determining ing Extent of Nonconform Nonconforming ing Aeas (all measure measurements ments are approximate approximate))
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Appendix 2 Methods for Measuring Dry Film Thickness on Steel Beams (Girders) (Nonmandatory) Appedx 2 s o a mandaory pa of ths sadard b it provides two sample potocos for measrng DF on beams and g des Appedx 2 may be ivoked by coa coact ct documens documens and here herefo fore re s wtten wtten i madatoy ang age s Appedx becomes madaory whe it s nvoed by specification, o he coacto coacto has ageed ageed i wr ng to compy wih the provisions o ns eei A2.1
A callege for te pante in coating seel beams o gders s povidng te same nform hckess ove igh and low verca srfaces as ove oizona srfaces On a beam hee ae popooaey moe edges ta end o have low dy film tcess DFT) and isde cores that tend to have igh DFT compaed o te cener of he flat srfaces srfaces Each p aie sualy deveops a pa paern ern of wo fo a specific tas He ce te DFT on te derside of e op flage fo exampe may be cosstenly on te igh side or he low sde of te taget DF This ype of eor s easy o detec and correc Radom erros pose a more diffclt probem Goss eors eors where he pa t s obvousy oo tn or oo tck must be correc correced ed and ae beyod he scope of ts standard e numbe of spo spo measemens hese potocos potocos may fa excee exceed d he "5 spo measuremet pe - 0 m -00 f) eqed i the standad he f DF detemao, descbed n Seco A22 povides a vey A3.4 allows fo fewe thorogh ispeco of the beam he sample DFT detemiaio described in Secio A3.4 fewe spot measuremets e user does not ave to require a full DF detemiao fo every beam i the src tue. Fo examp le he requ ireme may be fo fo a full DF detemia o on oe beam o of en o a sample DFT deemination on oe beam o offve or a combi aion of fu ad s ample DF detemiao s Note ta fo exsig srcures srcures te op sde of the top fange (Srface (Srface may o be accessible fo measing coa coati ti g thckess A beam has tweve deet sfaces as shown n Figue A2 A2 Ay one of tese sfaces may ave a DF ouside he specified age and hence sha be measured If te hckness of of e fange s less ha 25 mm - i , te coacting coacting paties may coose coose not not o o mease the DFT o he toe i .e . suf sufaces aces 2, 6 8 and 1 2 of Figure A2 A2 As As an nforma nt ial s rvey te i speco may wa to cec fo fo nformty of DF acoss each suface sufa ce I s the DF of e fange ear he file he same as ear e toe? I s e DFT for form m acoss the web? e nspecor must be sre to use a gage ta is no sscepbe o edge efects Follow e gage mafact e's nstuctions wen wen measui g he edges
A2.2
Divide te beam or gder no five eqa secos secos aong ts length I de seco Fo Fo tal beams where te egt of tfy tf y te 12 suace suacess of te bea m as show i Fgre A2 for each seco the beam s -90 cm -36 n) or more, dvde te web n af alog he legh of te beam Fo the fu DF deermnation each alf of he web s consideed a separae surface ae one spo measuremet as defed i Seco Secon n 8 ) on s ra race ce eac of te five secos secos he ocation of the sface sface 1 measuement whi a section s abtraly cose by the ispecor i each of the five secios The average of hese five spo mea suemens i s e DFT of s f face ace 1 Repea Repea for e oher suface sufacess (7 s rfa rfaces ces if the oe oe s not meas ed; 1 4 sufaces suf aces for for a beams The data ca b e reported reported i a format format shown Table A2
Full OFT Determination of a Beam:
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Less than -91 cm (36 inches) in height 12 spots
91 cm (36 inches) n heght or geater 14 spots 2
12 11
3 Toe Web 4
10
/
11
3 4t
10!
Filet
b
5
9
6 7
Bottom Flang
Figure A2: The Surfaces o a Steel Beam. Table A2.1 Datasheet for Recording Spot Measurements and Average OFT Values for the 12 Surfaces of a Beam or Girder Spot Measuremets of OFT on Beam # Surface
Secto 1
_____
Seco 2
Secon 3
Secion 4
Sectio Secti o 5
3
4t b
5 6 7 8 9 t b (� 18
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Average
Table Tab le A2.2 Number of Spot Measurement Measurements s Needed On Each Surface of a Beam for a Full or a Representative FT Determination Nmbe r of Spo Spott Measurements per Surface
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