PPI 072 33 52 23.15.pdf

Phase 2 Tank Far m I mpr ovement s ( P2002) N4425522F4025 FLCPS Manchest er , Washi ngt on PN 139588

SECTI ON 33 52 23. 15

POL SERVI CE PI PI NG WELDI NG

11/ 18

PART 1 GENERAL

1. 1 REFERENCES

The publ i cat i ons l i s t ed bel ow f or m a par t of t hi s speci f i cat i on t o t he ext ent r ef er enced. The publ i cat i ons ar e r ef er r ed t o wi t hi n t he t ext by t he basi c desi gnat i on onl y.

AMERI CAN SOCI ETY FOR NONDESTRUCTI VE TESTI NG ( ASNT)

ASNT SNT- TC- 1A ( 2020) Recommended Pr act i ce f or Per sonnel Qual i f i cat i on and Cer t i f i cat i on i n Nondest r uct i ve Test i ng

AMERI CAN SOCI ETY OF MECHANI CAL ENGI NEERS ( ASME)

ASME B31. 3 ( 2020) Pr ocess Pi pi ng

ASME BPVC SEC V ( 2017) BPVC Sect i on V- Nondest r uct i ve Exami nat i on

AMERI CAN WELDI NG SOCI ETY ( AWS)

AWS A2. 4 ( 2012) St andar d Symbol s f or Wel di ng, Br azi ng and Nondest r uct i ve Exami nat i on

AWS A3. 0M/ A3. 0 ( 2020) St andar d Wel di ng Ter ms and Def i ni t i ons

AWS A5. 1/ A5. 1M ( 2012) Speci f i cat i on f or Car bon St eel El ect r odes f or Shi el ded Met al Ar c Wel di ng

AWS A5. 4/ A5. 4M ( 2012) Speci f i cat i on f or St ai nl ess St eel El ect r odes f or Shi el ded Met al Ar c Wel di ng

AWS A5. 9/ A5. 9M ( 2017) Wel di ng Consumabl es- Wi r e El ect r odes, St r i p El ect r odes, Wi r es, and Rods f or Ar c Wel di ng of St ai nl ess and Heat Resi st i ng St eel s- Cl assi f i cat i on

AWS A5. 18/ A5. 18M ( 2021) Speci f i cat i on f or Car bon St eel El ect r odes and Rods f or Gas Shi el ded Ar c Wel di ng

AWS A5. 22/ A5. 22M ( 2012) Speci f i cat i on f or St ai nl ess St eel Fl ux Cor ed and Met al Cor ed Wel di ng El ect r odes and Rods

AWS A5. 32/ A5. 32M ( 2021) Wel di ng Consumabl es- Gases and Gas Mi xt ur es f or Fusi on Wel di ng and Al l i ed Pr ocesses

AWS C5. 5/ C5. 5M ( 2003) Recommended Pr act i ces f or Gas

SECTI ON 33 52 23. 15 Page 1 8/ 28/ 2023 Amendment 0003

Tungst en Ar c Wel di ng

AWS D1. 1/ D1. 1M ( 2020; Er r at a 1 2021) St r uct ur al Wel di ng Code - St eel

AWS D10. 4 ( 1986; R 2000) Recommended Pr act i ces f or Wel di ng Aust eni t i c Chr omi um- Ni ckel St ai nl ess St eel Pi pi ng and Tubi ng

AWS D10. 7/ D10. 7M ( 2008) Gui de f or t he Gas Shi el ded Ar c Wel di ng of Al umi num and Al umi num Al l oy Pi pe

AWS D10. 10/ D10. 10M ( 2021) Recommended Pr act i ces f or Local Heat i ng of Wel ds i n Pi pi ng and Tubi ng

AWS D10. 11M/ D10. 11 ( 2007) Gui de f or Root Pass Wel di ng of Pi pe Wi t hout Backi ng

AWS D10. 12M/ D10. 12 ( 2000) Gui del i ne f or Wel di ng Mi l d St eel Pi pe

AWS QC1 ( 2016) Speci f i cat i on f or AWS Cer t i f i cat i on of Wel di ng I nspect or s

AWS WHB- 4. 9 ( 2010) Wel di ng Handbook, Vol ume 4 - Mat er i al s and Appl i cat i ons Par t 1

AWS Z49. 1 ( 2012) Saf et y i n Wel di ng and Cut t i ng and Al l i ed Pr ocesses

1. 2 DEFI NI TI ONS

Def i ni t i ons must be i n accor dance wi t h AWS A3. 0M/ A3. 0 except as f ol l ows:

a. Wel d s l ag i s def i ned as t he cr yst al l i ne r esi due r emai ni ng on t he wel d sur f ace f ol l owi ng a wel d pr ocedur e whi ch uses f l ux as a shi el di ng met hod.

b. POL ser vi ce pi pi ng consi st s of pi pi ng and component s used f or pet r ol eum, oi l and l ubr i cant s ( POL) under pr essur e or gr avi t y f or ce i ncl udi ng modi f i cat i ons t o exi st i ng hydr ant f uel i ng syst ems.

1. 3 SUBMI TTALS

Gover nment appr oval i s r equi r ed f or submi t t al s wi t h a " G" or " S" c l assi f i cat i on. Submi t t al s not havi ng a " G" or " S" c l assi f i cat i on ar e f or Cont r act or Qual i t y Cont r ol appr oval . Submi t t he f ol l owi ng i n accor dance wi t h Sect i on 01 33 00 SUBMI TTAL PROCEDURES:

SD- 01 Pr econst r uct i on Submi t t al s

Wel di ng Pr ocedur e Speci f i cat i ons ( WPS) ; G

Wel der Per f or mance Qual i f i cat i on ( WPQ) ; G

Pr ocedur e Qual i f i cat i on Recor d ( PQR) ; G

Wel di ng Oper at i ons; G

SECTI ON 33 52 23. 15 Page 2

NDE Wel d I nspect i on Test Pl an; G

SD- 02 Shop Dr awi ngs

POL Ser vi ce Pi pi ng; G

SD- 06 Test Repor t s

Wel di ng Repor t s

Exami nat i ons, I nspect i ons and Test s

SD- 07 Cer t i f i cat es

Qual i f i cat i ons; G

1. 4 GENERAL REQUI REMENTS

Thi s sect i on cover s t he wel di ng of Pet r ol eum, Oi l and Lubr i cant ( POL) Ser vi ce syst ems. Devi at i ons f r om appl i cabl e codes, appr oved pr ocedur es, and appr oved det ai l dr awi ngs wi l l not be per mi t t ed wi t hout pr i or wr i t t en appr oval by t he Cont r act i ng Of f i cer . Mat er i al s or component s wi t h wel ds made of f s i t e wi l l not be accept ed i f t he wel di ng does not conf or m t o t he r equi r ement s of t hi s speci f i cat i on, unl ess ot her wi se speci f i ed.

Pr ocedur es must be devel oped by t he Cont r act or f or wel di ng al l met al s i ncl uded i n t he wor k. Wel di ng must not be st ar t ed unt i l wel di ng pr ocedur es, wel der s, and wel di ng oper at or s have been qual i f i ed.

Qual i f i cat i on t est i ng must be per f or med by an appr oved t est i ng l abor at or y, or by t he Cont r act or i f appr oved by t he Cont r act i ng Of f i cer . Cost s of such t est i ng must be bor ne by t he Cont r act or . The Cont r act i ng Of f i cer must be not i f i ed at l east one week i n advance of t he t i me and pl ace of t he t est s. I f t he Cont r act i ng Of f i cer el ect s t o wi t ness t he t est s, t he qual i f i cat i on t est s must be per f or med at or near t he wor ksi t e. The Cont r act or must mai nt ai n cur r ent r ecor ds of t he t est r esul t s obt ai ned i n t he wel di ng pr ocedur e, wel di ng oper at or , wel der per f or mance qual i f i cat i ons, and nondest r uct i ve exami nat i on ( NDE) pr ocedur es r eadi l y avai l abl e at t he s i t e f or exami nat i on by t he Cont r act i ng Of f i cer . The pr ocedur es f or maki ng t r ansi t i on wel ds bet ween di f f er ent mat er i al s or bet ween pl at es or pi pes of di f f er ent wal l t hi cknesses must be qual i f i ed.

Unl ess ot her wi se speci f i ed, t he choi ce of wel di ng pr ocess must be t he r esponsi bi l i t y of t he Cont r act or . I t shoul d be not ed t hat ASME B31. 3 i ncor por at es by r ef er ence, ot her r equi r ement s of ASME Sect i on V, Sect i on I X and speci f i c AWS r equi r ement s.

1. 5 PERFORMANCE

The Cont r act or wi l l be r esponsi bl e f or t he qual i t y of al l j oi nt pr epar at i on, wel di ng, and exami nat i on. Al l mat er i al s used i n t he wel di ng oper at i ons must be cl ear l y i dent i f i ed and r ecor ded. The i nspect i on and t est i ng def i ned i n t hi s speci f i cat i on ar e mi ni mum r equi r ement s.

Addi t i onal i nspect i on and t est i ng must be t he r esponsi bi l i t y of t he Cont r act or when he deems i t necessar y t o achi eve t he qual i t y r equi r ed.

1. 6 QUALI FI CATI ONS

Wel di ng pr ocedur es, wel der s, and wel di ng oper at or s pr evi ousl y qual i f i ed by t est may be accept ed f or t he wor k wi t hout r equal i f i cat i on, pr ovi ded t hat al l of t he f ol l owi ng condi t i ons ar e f ul f i l l ed:

SECTI ON 33 52 23. 15 Page 3

a. Copi es of t he wel di ng pr ocedur e speci f i cat i ons ( WPS) , t he pr ocedur e qual i f i cat i on r ecor d ( PQR) r ecor d, and t he wel der per f or mance qual i f i cat i on ( WPQ) ar e submi t t ed and appr oved i n accor dance wi t h par agr aph SUBMI TTALS.

b. Test i ng was per f or med by an appr oved t est i ng l abor at or y or appr oved t echni cal consul t ant or by t he Cont r act or ' s appr oved qual i t y assur ance or gani zat i on.

c. The wel di ng pr ocedur es, wel der s, and wel di ng oper at or s wer e qual i f i ed i n accor dance wi t h ASME B31. 3 and base mat er i al s, f i l l er mat er i al s, el ect r odes, equi pment , and pr ocesses conf or med t o t he appl i cabl e r equi r ement s of t hi s speci f i cat i on.

d. The r equi r ement s of par agr aph RENEWAL OF QUALI FI CATI ON bel ow ar e met and r ecor ds showi ng name of empl oyer and per i od of empl oyment usi ng t he pr ocess f or whi ch qual i f i ed ar e submi t t ed as evi dence of conf or mance.

1. 6. 1 Wel di ng Oper at i ons

The Cont r act or must pr ovi de a descr i pt i on of how t he cr i t i cal wel di ng oper at i ons wi l l be accompl i shed. Pr ovi de t he wel di ng pr ocedur es t o be used f or each oper at i on, t he sequence of wel di ng t o mi ni mi ze heat di st or t i on, sequence of wel di ng pi pi ng sect i ons bot h i n t he t r ench and out si de, machi ne wel di ng i f used, and mul t i pl e wel der s on same pi pe wel d.

Submi t det ai l ed pr ocedur es whi ch def i ne met hods of compl i ance t o cont r act dr awi ngs and speci f i cat i ons.

1. 6. 2 Wel di ng Pr ocedur e Speci f i cat i on and Pr ocedur e Qual i f i cat i on Recor ds

The Cont r act or must r ecor d i n det ai l and must qual i f y t he Wel di ng Pr ocedur e Speci f i cat i ons f or ever y pr oposed wel di ng pr ocedur e.

Qual i f i cat i on f or each wel di ng pr ocedur e must conf or m t o t he r equi r ement s of ASME B31. 3 and t o t hi s speci f i cat i on. The wel di ng pr ocedur es must speci f y back pur ge gas r equi r ement s, end pr epar at i on f or but t wel ds i ncl udi ng cl eani ng, al i gnment , and r oot openi ngs. Pr eheat , i nt er pass t emper at ur e cont r ol , and post heat t r eat ment of wel ds must be as r equi r ed by appr oved wel di ng pr ocedur es, unl ess ot her wi se i ndi cat ed or speci f i ed.

Copi es of t he wel di ng pr ocedur e speci f i cat i ons and wel d pr ocedur e qual i f i cat i on r ecor d r esul t s f or each t ype of wel di ng r equi r ed must be submi t t ed i n accor dance wi t h par agr aph SUBMI TTALS. Appr oval of any pr ocedur e does not r el i eve t he Cont r act or of t he sol e r esponsi bi l i t y f or pr oduci ng accept abl e wel ds. Wel di ng pr ocedur es must be i dent i f i ed i ndi v i dual l y and must be r ef er enced on t he POL ser vi ce pi pi ng shop dr awi ngs. Submi t det ai l dr awi ngs showi ng l ocat i on, l engt h, and t ype of wel ds; and i ndi cat i ng pr ewel d and post wel d heat t r eat ment and NDE as r equi r ed. The dr awi ngs must show t he wel di ng pr ocedur e speci f i cat i on ( WPS) t o be used at each wel d l ocat i on.

1. 6. 3 Wel der and Wel di ng Oper at or Per f or mance

Each wel der and wel di ng oper at or assi gned t o wor k must be qual i f i ed i n accor dance wi t h ASME B31. 3.

1. 6. 3. 1 Cer t i f i cat i on

Bef or e assi gni ng wel der s or wel di ng oper at or s t o t he wor k, t he Cont r act or must pr ovi de t he Cont r act i ng Of f i cer wi t h t hei r names t oget her wi t h

SECTI ON 33 52 23. 15 Page 4 cer t i f i cat i on t hat each i ndi v i dual i s per f or mance- qual i f i ed as speci f i ed.

The cer t i f i cat i on must st at e t he t ype of wel di ng and posi t i ons f or whi ch each i s qual i f i ed, t he code and wel di ng pr ocedur e speci f i cat i on under whi ch each i s qual i f i ed, dat e qual i f i ed, and t he f i r m and i ndi v i dual cer t i f y i ng t he qual i f i cat i on t est s. The Cont r act or must pr ovi de a summar y t abl e showi ng al l wel der s and t he WPS wi t h whi ch t hey ar e qual i f i ed t o wel d.

1. 6. 3. 2 I dent i f i cat i on

Each par t i cul ar wel d must be i dent i f i ed wi t h t he per sonal number , l et t er , or symbol assi gned t o each wel der or wel di ng oper at or . To i dent i f y wel ds, wr i t t en r ecor ds i ndi cat i ng t he l ocat i on of wel ds made by each wel der or wel di ng oper at or must be submi t t ed, and each wel der or wel di ng oper at or must appl y t he per sonal mar k adj acent t o t he wel ds usi ng a r ubber st amp or f el t - t i pped mar ker wi t h per manent , weat her pr oof i nk or ot her met hods appr oved by t he Cont r act i ng Of f i cer t hat do not def or m t he met al .

I dent i f i cat i on by di e st amps or el ect r i c et cher s wi l l not be al l owed.

1. 6. 3. 3 Renewal of Qual i f i cat i on

Requal i f i cat i on of a wel der or wel di ng oper at or must be r equi r ed under any of t he f ol l owi ng condi t i ons:

a. When a wel der or wel di ng oper at or has not used t he speci f i c wel di ng pr ocedur e f or a per i od of 3 mont hs; t he per i od may be ext ended t o 6 mont hs i f t he wel der or wel di ng oper at or has been empl oyed on anot her wel di ng pr ocedur e.

b. When a wel der or wel di ng oper at or has not wel ded wi t h any pr ocedur e dur i ng a per i od of 3 mont hs, al l t he per sonal qual i f i cat i ons must be consi der ed expi r ed, i ncl udi ng any ext ensi on by v i r t ue of a. above.

c. Ther e i s speci f i c r eason t o quest i on t he per son' s abi l i t y t o make wel ds t hat wi l l meet t he r equi r ement s of t he speci f i cat i ons.

d. The wel der or wel di ng oper at or was qual i f i ed by an empl oyer , ot her t han t hose f i r ms per f or mi ng wor k under t hi s cont r act , and a qual i f i cat i on t est has not been t aken wi t hi n t he pr ecedi ng 12 mont hs.

e. Renewal of qual i f i cat i on f or a speci f i c wel di ng pr ocedur e under condi t i ons a. , b. , and d. , above, needs t o be made on onl y a s i ngl e t est j oi nt or pi pe of a t hi ckness, posi t i on, or mat er i al r equi r ed by t he wel di ng pr ocedur e speci f i cat i ons t o r eest abl i sh t he wel der ' s or wel di ng oper at or ' s qual i f i cat i on f or t he pr evi ous qual i f i cat i on.

1. 6. 4 Test Repor t s

Test r epor t s must consi st of t he f ol l owi ng.

a. Recor ds made by t he AWS cer t i f i ed i nspect or f or al l dut i es per f or med per par agr aph 4. 2 of AWS QC1.

b. Al l NDE ( r adi ogr aph) r epor t s wi t h uni que wel d I D f or each wel d t est ed.

c. " Wel d Maps" . These maps/ dr awi ngs cor r el at e t he shop dr awi ngs submi t t ed t o t he NDE r epor t s. The NDE r epor t t hat shows a wel d number as accept abl e i s cor r el at ed wi t h wel d number on t he dr awi ngs.

SECTI ON 33 52 23. 15 Page 5

d. Pr ovi de t he l ocat i on of each wel d, what pr ocedur e was used, whi ch wel der di d t he wel d, t he r esul t s of t he v i sual t est , and t he r esul t s of t he NDE.

1. 6. 5 I nspect i on and NDE Per sonnel

Cont r act or must pr ovi de a commer ci al l y i ndependent or gani zat i on f or al l wel d exami nat i ons. Al l i nspect i on and NDE per sonnel must be qual i f i ed i n accor dance wi t h t he f ol l owi ng r equi r ement s. The cont r act or must submi t t he qual i f i cat i ons of al l t he t est i ng per sonnel t hat wi l l per f or m al l f i el d t est s f or r evi ew by t he Cont r act i ng Of f i cer . The qual i f i cat i ons of al l per sonnel on t he j ob s i t e t hat wi l l per f or m wel di ng i nspect i ons and NDE must be submi t t ed f or appr oval . Al l i nspect or s and NDE per sonnel must have a mi ni mum of one year exper i ence i nspect i ng t he pi pi ng mat er i al bei ng used and f i ve year s i n mi l i t ar y or commer ci al ai r cr af t hydr ant f uel i ng syst ems or t r uck f uel i ng syst ems, pet r ol eum r ef i ner i es, power gener at i ng pl ant s, or chemi cal pr ocess pl ant s.

1. 6. 5. 1 I nspect or Cer t i f i cat i on

Vi sual wel di ng i nspect or s must be qual i f i ed i n accor dance wi t h AWS QC1.

1. 6. 5. 2 NDE Per sonnel

NDE per sonnel must be cer t i f i ed Level I I i n accor dance wi t h ASME Sect i on V, ASME B31. 3 and ASNT SNT- TC- 1A f or each NDE pr ocedur e he i s r equi r ed t o use, and a wr i t t en pr ocedur e f or t he cont r ol and admi ni st r at i on of NDE per sonnel t r ai ni ng, exami nat i on, and cer t i f i cat i on must be est abl i shed.

The pr ocedur es must be based on appr opr i at e speci f i c and gener al gui del i nes of t r ai ni ng and exper i ence r ecommended by ASNT SNT- TC- 1A.

Shoul d t he NDE exami ner al so be a wel der , t hat i ndi v i dual i s di squal i f i ed f r om exami ni ng t hei r own wor k.

1. 7 DELI VERY, STORAGE, AND HANDLI NG

Al l f i l l er met al s, el ect r odes, and ot her wel di ng mat er i al s must be del i ver ed t o t he s i t e i n manuf act ur er s ' or i gi nal packages and st or ed i n a dr y space unt i l used. Packages must be pr oper l y l abel ed and desi gned t o gi ve maxi mum pr ot ect i on f r om moi st ur e and t o i nsur e saf e handl i ng.

1. 7. 1 Mat er i al Cont r ol

Mat er i al s must be st or ed i n a cont r ol l ed access and cl ean, dr y ar ea t hat i s weat her t i ght and i s mai nt ai ned at a t emper at ur e r ecommended by t he manuf act ur er . The mat er i al s must not be i n cont act wi t h t he f l oor and must be st or ed on wooden pal l et s or cr i bbi ng.

1. 7. 1. 1 Damaged Cont ai ner s

Low- hydr ogen st eel el ect r odes must be st or ed i n t hei r seal ed shi ppi ng cont ai ner . I f t he seal i s damaged dur i ng shi pment or st or age, and t he damage i s not i mmedi at el y det ect ed, t he cover ed el ect r odes i n t hat cont ai ner must be r ebaked i n accor dance wi t h t he manuf act ur er ' s i nst r uct i ons pr i or t o i ssuance or must be di scar ded. I f a cont ai ner i s damaged i n st or age and t he damage i s wi t nessed, t he el ect r odes f r om t hat cont ai ner must be i mmedi at el y pl aced i n a st or age oven. The st or age oven t emper at ur e must be as r ecommended by t he manuf act ur er or t he wel di ng mat er i al speci f i cat i on.

SECTI ON 33 52 23. 15 Page 6

1. 7. 1. 2 Par t i al I ssues

When a cont ai ner of cover ed el ect r odes i s opened and onl y a por t i on of t he cont ent i s i ssued, t he r emai ni ng por t i on must , wi t hi n t he l i mi t s est abl i shed by AWS D1. 1/ D1. 1M be pl aced i n a st or age oven.

1. 7. 2 Damaged Mat er i al s

Mat er i al s whi ch ar e damaged must be di scar ded. Cover ed el ect r odes whi ch ar e oi l or wat er - soaked, di r t y, or on whi ch t he f l ux has separ at ed f r om t he wi r e must be di scar ded.

1. 8 SYMBOLS

Symbol s must be i n accor dance wi t h AWS A2. 4.

1. 9 SAFETY

Saf et y pr ecaut i ons must conf or m t o AWS Z49. 1.

PART 2 PRODUCTS

2. 1 WELDI NG MATERI ALS

Wel di ng mat er i al s f or car bon st eel , and st ai nl ess st eel and al umi num must compl y wi t h AWS WHB- 4. 9. Wel di ng equi pment , el ect r odes, wel di ng wi r e, shi el di ng and backi ng gas, and f l uxes must be capabl e of pr oduci ng sat i sf act or y wel ds when used by a qual i f i ed wel der or wel di ng oper at or usi ng qual i f i ed wel di ng pr ocedur es. Al l f i el d gi r t h r oot pass wel ds must be made wi t h non- cover ed el ect r odes or wel di ng wi r e. Al l r oot passes must be made wi t h shi el di ng and backi ng gas. Ext er nal wel ds on t he pi pe such as at t achi ng pi pe suppor t s may be made wi t h cover ed el ect r odes or wel di ng wi r e. El ect r odes, wel di ng wi r e and/ or f l uxes must be i n accor dance wi t h Tabl e 1.

TABLE I

AWS Pr ocess Al l oy Consumabl e Use

( Exampl es) ( 1)

AWS A5. 1/ A5. 1M SMAW Low Car bon E7018 Fi l l

AWS A5. 4/ A5. 4M SMAW St ai nl ess E308L, E309L Fi l l

AWS A5. 9/ A5. 9M GTAW St ai nl ess ER308L, ER309L Root and Fi l l

AWS A5. 18/ A5. 18M GTAW Low Car bon E70S- 3, E70S- 6 Root and Fi l l

AWS A5. 22/ A5. 22M GTAW St ai nl ess E308LT1- 1 Root ( Backi ng and Shi el di ng Gas Requi r ed)

AWS A5. 32/ A5. 32M GTAW Al l Shi el di ng Gas

SECTI ON 33 52 23. 15 Page 7

TABLE I

AWS Pr ocess Al l oy Consumabl e Use

( Exampl es) ( 1)

Not e( 1) : The consumabl e mat er i al desi gnat i ons shown ar e exampl es onl y and ar e not i nt ended t o l i mi t t he Cont r act or ' s sel ect i on of consumabl e mat er i al s.

PART 3 EXECUTI ON

3. 1 WELDI NG OPERATI ONS

Wel di ng must be per f or med i n accor dance wi t h qual i f i ed pr ocedur es usi ng qual i f i ed wel der s and wel di ng oper at or s. Wel di ng must not be done when t he qual i t y of t he compl et ed wel d coul d be i mpai r ed by t he pr evai l i ng wor ki ng or weat her condi t i ons. The Cont r act i ng Of f i cer must det er mi ne when weat her or wor ki ng condi t i ons ar e unsui t abl e f or wel di ng. Wel di ng of hanger s, suppor t s, and pl at es t o st r uct ur al member s must conf or m t o Sect i on 05 05 23. 16 STRUCTURAL WELDI NG.

Wel di ng must be per f or med i n accor dance wi t h ASME B31. 3 and t he appl i cabl e por t i ons of AWS D10. 4, AWS D10. 7/ D10. 7M, AWS D10. 10/ D10. 10M, AWS D10. 11M/ D10. 11, AWS D10. 12M/ D10. 12, and AWS C5. 5/ C5. 5M.

Al l j oi nt s unl ess i ndi cat ed ot her wi se, i n car bon st eel and st ai nl ess st eel pi pi ng syst ems must be wel ded. Unl ess ot her wi se appr oved, al l gi r t h wel ds must be compl et e penet r at i on gr oove wel ds made i n accor dance wi t h qual i f i ed wel di ng pr ocedur es. The r oot pass on st ai nl ess st eel and car bon st eel pi pe must be by t he GTAW pr ocess.

a. Wel d Pr epar at i on must compl y wi t h t he r equi r ement s of ASME B31. 3 and t he qual i f i ed Wel di ng Pr ocedur e Speci f i cat i on. The use of " r i ce paper " as pur ge bl ocks i s not per mi t t ed. Cont r act or must submi t al t er nat e met hod f or appr oval .

b. Backi ng Ri ngs. The use of backi ng r i ngs f or maki ng or r epai r i ng wel ds wi l l not be per mi t t ed.

3. 1. 1 Base Met al Pr epar at i on

Oxy- f uel cut t i ng must not be used on aust eni t i c st ai nl ess st eel or nonf er r ous mat er i al s.

Mechani cal gr i ndi ng of t her mal cut ends must be used t o r emove t he heat af f ect ed ar ea but shoul d be l i mi t ed t o maxi mum 1/ 8 i nch.

3. 1. 2 Wel d Joi nt Fi t - Up

Par t s t hat ar e t o be j oi ned by wel di ng must be f i t t ed, al i gned, and r et ai ned i n posi t i on dur i ng t he wel di ng oper at i on by t he use of bar s, j acks, c l amps, or ot her mechani cal f i x t ur es. End wel ds must be pr oper l y al i gned pr i or t o wel di ng i n accor dance wi t h Chapt er V of ASME B31. 3. Al l socket - wel ded j oi nt s must be pr oper l y f i t t ed wi t h gaps bet ween t he pi pe and t he bot t om of t he socket i n accor dance wi t h ASME B31. 3. Cont r act or must i mpl ement a pr ogr am t o ensur e gaps ar e pr oper l y measur ed and document ed. Wel ded t empor ar y at t achment s must not be used except when i t

SECTI ON 33 52 23. 15 Page 8 i s i mpr act i cal t o use mechani cal f i x t ur es. When t empor ar y at t achment s ar e used, t hey must be t he same mat er i al as t he base met al , and must be compl et el y r emoved by gr i ndi ng or t her mal cut t i ng af t er t he wel di ng oper at i on i s compl et ed. I f t her mal cut t i ng i s used, t he at t achment must be cut t o not l ess t han 1/ 4 i nch f r om t he member and t he bal ance r emoved by gr i ndi ng. Af t er t he t empor ar y at t achment has been r emoved, t he ar ea must be vi sual l y exami ned.

3. 1. 3 But t Wel d Joi nt Spaci ng

But t wel d j oi nt s must be spaced a mi ni mum of 6 i nches apar t . Measur ement must be t aken f r om t he t oe of t he f i r st wel d t o t he t oe of t he second wel d. The measur ement must be t aken at t he c l osest poi nt bet ween t he wel ds when vi sual l y i nspect ed. I f spaci ng i s not possi bl e due t o exi st i ng condi t i ons, a r educt i on i n spaci ng t o not l ess t han 2 i nches may be made.

3. 1. 4 Pr eheat and I nt er pass Temper at ur es

Pr eheat t emper at ur es must meet t he r equi r ement s speci f i ed by ASME B31. 3.

However , i n no case wi l l t he pr eheat be bel ow 50 degr ees F f or f er r i t i c st eel or aust eni t i c st ai nl ess st eel , or 32 degr ees F f or nonf er r ous al l oys. The maxi mum i nt er pass t emper at ur es must not exceed 300 degr ees F f or aust eni t i c st ai nl ess st eel s, ni ckel al l oys, and copper al l oys; and 500 degr ees F f or car bon st eel s. Pr eheat t echni ques must be such as t o ensur e t hat t he f ul l t hi ckness of t he wel d j oi nt pr epar at i on and or adj acent base mat er i al , at l east 3 i nches i n al l di r ect i ons, i s at t he speci f i ed t emper at ur e. Pr eheat i ng by i nduct i on or r esi st ance met hods i s pr ef er r ed.

When f l ame heat i ng i s used, onl y a neut r al f l ame must be empl oyed.

Oxy- f uel heat i ng must not be used on aust eni t i c st ai nl ess st eel ; however , ai r - f uel heat i ng i s accept abl e i f cont r ol l ed t o ensur e t hat t he sur f ace t emper at ur e does not exceed 150 degr ees F. I nt er pass t emper at ur es must be checked on t he sur f ace of t he component wi t hi n one i nch of t he wel d gr oove and at t he st ar t i ng l ocat i on of t he next wel d pass, and f or a di st ance of about 6 i nches ahead of t he wel d, but not on t he ar ea t o be wel ded.

3. 1. 5 Pr oduct i on Wel di ng I nst r uct i ons

a. Wel di ng must not be done when t he ambi ent t emper at ur e i s l ower t han 0 degr ees F.

b. Wel di ng i s not per mi t t ed on sur f aces t hat ar e wet or cover ed wi t h i ce, when snow or r ai n i s f al l i ng on t he sur f aces t o be wel ded, or dur i ng per i ods of hi gh wi nds, unl ess t he wel der s and t he wor k ar e pr oper l y pr ot ect ed.

c. Gases f or pur gi ng and shi el di ng must be wel di ng gr ade and must have a dew poi nt of mi nus 40 degr ees F or l ower .

d. Back pur ges ar e r equi r ed f or aust eni t i c st ai nl ess st eel s and nonf er r ous al l oys wel ded f r om one si de and must be set up such t hat t he f l ow of gas f r om t he i nl et t o t he out l et or i f i ce passes acr oss t he ar ea t o be wel ded. The oxygen cont ent of t he gas exi t i ng f r om t he pur ge vent must be l ess t han 2 per cent pr i or t o wel di ng. The f l ow r at e must be t hat r equi r ed by t he appr oved wel d pr ocedur e speci f i cat i on.

e. The pur ge on gr oove wel ds must be mai nt ai ned f or at l east t wo passes or 3/ 16 i nch whi chever i s gr eat er .

SECTI ON 33 52 23. 15 Page 9 f . Removabl e pur ge dam mat er i al s must be made of expandabl e or f l exi bl e pl ugs, such as Pl exi gl as, pl ywood ( whi ch must be dr y when used) . Wood dams must be ki l n- dr i ed qual i t y. Pur ge dams must not be made of pol yvi nyl al cohol .

g. Any wel di ng pr ocess whi ch r equi r es t he use of ext er nal gas shi el di ng must not be done i n a dr af t or wi nd unl ess t he wel d ar ea i s pr ot ect ed by a shel t er . Thi s shel t er must be of mat er i al and shape appr opr i at e t o r educe wi nd vel oci t y i n t he v i c i ni t y of t he wel d t o a maxi mum of 5 mph ( 440 f pm) .

h. Tack wel ds t o be i ncor por at ed i n t he f i nal wel ds must have t hei r ends t aper ed by gr i ndi ng or wel di ng t echni que. Tack wel ds t hat ar e cr acked or def ect i ve must be r emoved and t he gr oove must be r et acked pr i or t o wel di ng. Tempor ar y t ack wel ds must be r emoved, t he sur f ace gr ound smoot h, and vi sual l y i nspect ed. For l ow- al l oy and har denabl e hi gh- al l oy st eel s, t he ar ea must be magnet i c par t i c l e exami nat i on i nspect ed.

i . Gr i ndi ng of compl et ed wel ds i s t o be per f or med onl y t o t he ext ent r equi r ed f or NDE, i ncl udi ng any i nser vi ce exami nat i on, and t o pr ovi de wel d r ei nf or cement wi t hi n t he r equi r ement s of ASME B31. 3. I f t he sur f ace of t he wel d r equi r es gr i ndi ng, r educi ng t he wel d or base mat er i al bel ow t he mi ni mum r equi r ed t hi ckness must be avoi ded.

Mi ni mum wel d ext er nal r ei nf or cement must be f l ush bet ween ext er nal sur f aces.

j . Each qual i f i ed wel der must be assi gned an i dent i f i cat i on symbol . Al l wel ds must be per manent l y mar ked wi t h t he symbol of t he i ndi v i dual who made t he wel d.

3. 1. 6 Post wel d Heat Tr eat ment

a. When r equi r ed post wel d heat t r eat ment must be per f or med i n accor dance wi t h ASME B31. 3. Temper at ur es f or l ocal post wel d heat t r eat ment must be measur ed cont i nuousl y by t her mocoupl es i n cont act wi t h t he wel dment .

b. Post wel d heat t r eat ment of l ow- al l oy st eel s, when r equi r ed, must be per f or med i mmedi at el y upon compl et i on of wel di ng and pr i or t o t he t emper at ur e of t he wel d f al l i ng bel ow t he pr eheat t emper at ur e.

However , post wel d heat t r eat ment may be post poned af t er t he compl et i on of t he wel d, i f , i mmedi at el y af t er t he wel d i s compl et ed, i t i s mai nt ai ned at a mi ni mum t emper at ur e of 300 degr ees F or t he pr eheat t emper at ur e, whi chever i s gr eat er , f or 2- hour s per one i nch of wel d t hi ckness.

3. 2 EXAMI NATI ONS, I NSPECTI ONS AND TESTS

Wel d i nspect i on and NDE must be per f or med by t he Cont r act or t o det ect sur f ace and i nt er nal di scont i nui t i es i n compl et ed wel ds. The ser vi ces of a qual i f i ed commer ci al i nspect i on or t est i ng l abor at or y or t echni cal consul t ant meet i ng t he r equi r ement s of par agr aph I NSPECTI ON AND NDE PERSONNEL, appr oved by t he Cont r act i ng Of f i cer , must be empl oyed by t he Cont r act or . Al l compl et ed wel ds must be vi sual l y i nspect ed i n accor dance wi t h t he v i sual i nspect i on r equi r ement s of ASME B31. 3 and AWS D1. 1/ D1. 1M.

Radi ogr aphi c, Li qui d penet r ant or Magnet i c par t i c l e exami nat i on must be r equi r ed as i ndi cat ed bel ow. When i n- pr ocess wel d qual i t y cont r ol i s r equi r ed f or t i e- i n wel ds, i t must be per f or med i n accor dance wi t h ASME B31. 3. When i nspect i on and t est i ng i ndi cat es di squal i f y i ng def ect s

SECTI ON 33 52 23. 15 Page 10 i n a wel d j oi nt , t he wel d must be r epai r ed by a qual i f i ed wel der i n accor dance wi t h par agr aph CORRECTI ONS AND REPAI RS. The Cont r act or must submi t wel d i nspect i on and NDE f i el d t est i ng r epor t s t o t he Cont r act i ng Of f i cer .

The per son per f or mi ng t he wel d i nspect i on must per f or m t he f ol l owi ng:

a. Ver i f y t hat t he base mat er i al s and consumabl e wel di ng mat er i al s conf or m t o t he speci f i cat i ons and t hat wel di ng f i l l er met al s used ar e as speci f i ed f or each base mat er i al .

b. Ver i f y t hat t he wel di ng equi pment t o be used f or t he wor k i s appr opr i at e f or use wi t h t he wel di ng pr ocedur e speci f i cat i on and has t he capabi l i t y t o meet t he appl i cabl e r equi r ement s of t he wel di ng pr ocedur e.

c. Ver i f y t hat onl y appr oved or qual i f i ed wel di ng pr ocedur es ar e used f or t he wor k.

d. Ver i f y t hat t he edge pr epar at i on or j oi nt geomet r y meet t he r equi r ement s of t he wel di ng pr ocedur e and dr awi ngs.

e. Ver i f y t hat t he speci f i ed f i l l er met al s ar e used and t hat f i l l er met al s ar e mai nt ai ned i n pr oper condi t i on, per r equi r ement s, or as r ecommended by t he manuf act ur er .

f . Ver i f y t hat t he t echni que and per f or mance of each wel der , wel di ng oper at or , and t ack wel der ar e as speci f i ed.

g. Ver i f y t hat t he wor k conf or ms t o r equi r ement s of t he appl i cabl e st andar ds, dr awi ngs, or ot her document s.

h. Ver i f y t hat t he wor k i nspect ed i s i dent i f i ed and document ed i n accor dance wi t h speci f i ed r equi r ement s.

i . Pr epar e c l ear and conci se r epor t s and ver i f y t hat r ecor ds of t he r esul t s of exami nat i ons ar e mai nt ai ned.

j . Ver i f y t he appr oved WPS pr e- heat and post heat pr ocedur es ar e bei ng used.

3. 2. 1 Vi sual I nspect i on

Wel d j oi nt s must be i nspect ed vi sual l y as f ol l ows:

a. Bef or e wel di ng - f or compl i ance wi t h r equi r ement s f or j oi nt pr epar at i on, al i gnment and f i t - up, and cl eanl i ness i n accor dance wi t h

ASME B31. 3.

b. Dur i ng wel di ng - f or cr acks and conf or mance t o t he appr oved wel di ng pr ocedur e onl y when i n- pr ocess wel d qual i t y cont r ol i s r equi r ed by

ASME ASME B31. 3.

c. Af t er wel di ng - f or cr acks, cont our and f i ni sh, bead r ei nf or cement , under cut t i ng, over l ap, wel d s l ag on t he i nt er i or of t he pi pe and si ze of wel ds i n accor dance wi t h ASME B31. 3 and AWS D1. 1/ D1. 1M. Vi sual exami nat i on of t he i nt er i or of t he pi pe may be per f or med by any of t he r emot e means al l owed by ASME BPVC SEC V, v i sual i nspect i on. Vi sual

SECTI ON 33 52 23. 15 Page 11 exami nat i on of t he wel d must be per f or med pr i or t o any ot her NDE exami nat i ons as r equi r ed by t hi s speci f i cat i on.

3. 2. 2 NDE Test i ng Fr equency

Pi pe f i el d wel ds, i ncl udi ng hi gh poi nt vent pi pe t ees, i nser t but t wel ded wel d- o- l et s, and l ow poi nt dr ai n pi pe, must be exami ned by r adi ogr aphi c met hods at t he f r equency of i nspect i on c l ar i f i ed bel ow. Al l socket wel ds and sock- o- l et s or wel d- o- l et s t o pi pe wel ds must be exami ned wi t h ei t her magnet i c par t i c l e or l i qui d penet r ant met hods, i n addi t i on t o t he v i sual exami nat i ons. The ser vi ces of a qual i f i ed commer ci al or t est i ng l abor at or y appr oved by t he Cont r act i ng Of f i cer must be empl oyed by t he Cont r act or f or t est i ng of pi pi ng wel ds. Cost s of t est i ng, i ncl udi ng r et est i ng of r epai r ed wel ds, must be bor ne by t he Cont r act or .

a. Pr ovi de sel ect r andom r adi ogr aphi c t est i ng i n accor dance wi t h ASME B31. 3 f or al l abovegr ound pi pi ng. The i nspect i on must i ncl ude an exami nat i on of wel ds made by each wel di ng oper at or or wel der . Not l ess t han 10 per cent of pr oj ect t ot al wel ds shal l be exami ned.

Cont r act or shal l submi t t o t he Cont r act i ng Of f i cer f or Gover nment r evi ew and appr oval t he NDE Wel d I nspect i on Test Pl an whi ch def i nes t he t est l ot gr oupi ngs whi ch wi l l each r ecei ve 10 per cent i nspect i on f or appr oval . Test l ot gr oupi ngs shal l r epr esent al l di f f er ent wel di ng envi r onment s and pr ocedur es and shal l i ncl ude as a mi ni mum shop wel ds, wor k l aydown ar e wel ds, and t i e- i n wel ds. I f t he t est i ng r eveal s t hat any wel ds f ai l t o meet mi ni mum qual i t y r equi r ement s, an addi t i onal per cent of t he wel ds i n t hat same gr oup must be i nspect ed i n accor dance wi t h ASME B31. 3. I f al l of t he addi t i onal wel ds i nspect ed meet t he qual i t y r equi r ement s, t he ent i r e gr oup of wel ds r epr esent ed must be accept ed and t he def ect i ve wel ds must be r epai r ed. I f any of t he addi t i onal wel ds i nspect ed al so f ai l t o meet t he qual i t y r equi r ement s, t hat ent i r e gr oup of wel ds must be r ej ect ed. The r ej ect ed wel ds must be r emoved and r ewel ded, or t he r ej ect ed wel ds must be 100 per cent i nspect ed and al l def ect i ve wel d ar eas r emoved and r ewel ded.

3. 2. 3 NDE Test i ng

NDE must be as r equi r ed by ASME B31. 3 and i n accor dance wi t h wr i t t en pr ocedur es. Pr ocedur es f or r adi ogr aphi c, l i qui d penet r ant and magnet i c par t i c l e t est s and met hods must conf or m t o ASME BPVC SEC V. Onl y Radi ogr aphy ar e accept abl e t est met hods f or but t wel ded j oi nt s. The appr oved pr ocedur e must be demonst r at ed t o t he sat i sf act i on of t he Cont r act i ng Of f i cer . I n addi t i on t o t he i nf or mat i on r equi r ed i n ASME BPVC SEC V, t he wr i t t en pr ocedur es must i ncl ude t he t i mi ng of t he NDE i n r el at i on t o t he wel di ng oper at i ons and saf et y pr ecaut i ons.

The ser vi ces of a commer ci al l y i ndependent qual i f i ed t est i ng agency appr oved by t he Cont r act i ng Of f i cer must be empl oyed by t he Cont r act or f or t est i ng of pi pi ng wel ds. Cost s of t est i ng, i ncl udi ng r et est i ng of r epai r ed wel ds, must be bor ne by t he Cont r act or . Wel d r i ppl es or sur f ace i r r egul ar i t i es t hat mi ght mask or be conf used wi t h t he r adi ogr aphi c i mage of any obj ect i onabl e def ect must be r emoved by gr i ndi ng and, or ot her sui t abl e mechani cal means. The wel d sur f ace must be mer ged smoot hl y wi t h t he base met al sur f ace.

3. 2. 4 I nspect i on and Test s by t he Gover nment

The Gover nment may per f or m i nspect i on and suppl ement al nondest r uct i ve or

SECTI ON 33 52 23. 15 Page 12 dest r uct i ve t est s as deemed necessar y. The cost of suppl ement al NDE wi l l be bor ne by t he Gover nment . The cor r ect i on and r epai r of def ect s and t he r eexami nat i on of wel d r epai r s must be per f or med by t he Cont r act or at no addi t i onal cost t o t he Gover nment . I nspect i on and t est s wi l l be per f or med as r equi r ed f or v i sual i nspect i on and NDE, except t hat dest r uct i ve t est s may be r equi r ed al so. When dest r uct i ve t est s ar e or der ed by t he Cont r act i ng Of f i cer and per f or med by t he Cont r act or and t he speci mens or ot her suppl ement al exami nat i ons i ndi cat e t hat t he mat er i al s and wor kmanshi p do not conf or m t o t he cont r act r equi r ement s, t he cost of t he t est s, cor r ect i ons, and r epai r s must be bor ne by t he Cont r act or . When t he speci mens or ot her suppl ement al exami nat i ons of dest r uct i ve t est s i ndi cat e t hat mat er i al s or wor kmanshi p do conf or m t o t he speci f i cat i on r equi r ement s, t he cost of t he t est s and r epai r s wi l l be bor ne by t he Gover nment . When dest r uct i ve t est s ar e made, r epai r s must be made by qual i f i ed wel der s or wel di ng oper at or s usi ng wel di ng pr ocedur es whi ch wi l l devel op t he f ul l st r engt h of t he member s cut . Wel di ng must be subj ect t o i nspect i on and t est s i n t he mi l l , shop, and f i el d. When mat er i al s or wor kmanshi p do not conf or m t o t he speci f i cat i on r equi r ement s, t he wor k may be r ej ect ed at any t i me bef or e f i nal accept ance of t he syst em cont ai ni ng t he wel dment .

3. 3 ACCEPTANCE STANDARDS

Accept ance st andar ds must be i n accor dance wi t h ASME B31. 3 par agr aph

341. 3. 2, Chapt er VI i n addi t i on t o t he f ol l owi ng speci f i ed i t ems.

3. 3. 1 Vi sual

The f ol l owi ng i ndi cat i ons ar e unaccept abl e:

Wel d Sl ag on t he i nt er i or of t he pi pe.

3. 3. 2 Magnet i c Par t i c l e Exami nat i on

The f ol l owi ng r el evant i ndi cat i ons ar e unaccept abl e:

a. Any l i near i ndi cat i ons.

b. Rounded i ndi cat i ons wi t h di mensi ons gr eat er t han 3/ 16 i nch.

c. Four or mor e r ounded i ndi cat i ons i n a l i ne separ at ed by 1/ 16 i nch or l ess edge- t o- edge.

d. Ten or mor e r ounded i ndi cat i ons i n any 6 squar e i nches of sur f ace wi t h t he maj or di mensi on of t hi s ar ea not t o exceed 6 i nches wi t h t he ar ea t aken i n t he most unf avor abl e l ocat i on r el at i ve t o t he i ndi cat i ons bei ng eval uat ed.

3. 3. 3 Li qui d Penet r ant Exami nat i on

I ndi cat i ons wi t h maj or di mensi ons gr eat er t han 1/ 16 of an i nch must be consi der ed r el evant . The f ol l owi ng r el evant i ndi cat i ons ar e unaccept abl e:

a. Any cr acks or l i near i ndi cat i ons.

b. Rounded i ndi cat i ons wi t h di mensi ons gr eat er t han 3/ 16 i nch.

c. Four or mor e r ounded i ndi cat i ons i n a l i ne separ at ed by 1/ 16 i nch or l ess edge- t o- edge.

SECTI ON 33 52 23. 15 Page 13

d. Ten or mor e r ounded i ndi cat i ons i n any 6 squar e i nches of sur f ace wi t h t he maj or di mensi on of t hi s ar ea not t o exceed 6 i nches wi t h t he ar ea t aken i n t he most unf avor abl e l ocat i on r el at i ve t o t he i ndi cat i ons bei ng eval uat ed.

3. 4 CORRECTI ONS AND REPAI RS

Di squal i f y i ng def ect s must be r emoved and r epai r ed as speci f i ed i n ASME B31. 3 unl ess ot her wi se speci f i ed. Di squal i f y i ng def ect s di scover ed bet ween wel d passes must be r epai r ed bef or e addi t i onal wel d mat er i al i s deposi t ed. Af t er def ect r emoval i s compl et e and bef or e r ewel di ng, t he ar ea must be exami ned by t he same t est met hod whi ch f i r st r eveal ed t he def ect t o ensur e t hat t he def ect has been el i mi nat ed. Af t er r ewel di ng, t he r epai r ed ar ea must be r eexami ned by t he same t est met hod or i gi nal l y used f or t hat ar ea. Any i ndi cat i on of a def ect must be r egar ded as a def ect unl ess r eeval uat i on by NDE or by sur f ace condi t i oni ng shows t hat no di squal i f y i ng def ect s ar e pr esent .

3. 4. 1 Def ect Removal

Def ect i ve or unsound wel d j oi nt s must be cor r ect ed by r emovi ng and r epl aci ng t he ent i r e wel d j oi nt , or f or t he f ol l owi ng def ect s cor r ect i ons must be made as f ol l ows:

a. Excessi ve Convexi t y and Over l ap: Reduce by r emoval of excess met al .

b. Excessi ve Concavi t y of Wel d, Under si zed Wel ds, Under cut t i ng: Cl ean and deposi t addi t i onal wel d met al .

c. Excessi ve Wel d Por osi t y, I ncl usi ons, Lack of Fusi on, I ncompl et e Penet r at i on: Remove def ect i ve por t i ons and r ewel d.

d. Cr acks or l i ner i ndi cat i ons i n Wel d or Base Met al : Remove cr ack t hr oughout i t s l engt h, i ncl udi ng sound wel d met al f or a di st ance of t wi ce t he t hi ckness of t he base met al or t wo i nches, whi chever i s l ess, beyond each end of t he cr ack, f ol l owed by t he r equi r ed r ewel di ng. Compl et e r emoval must be conf i r med by magnet i c par t i c l e i nspect i on f or car bon st eel or l i qui d penet r ant i nspect i on f or st ai nl ess st eel . I nspect i on pr ocedur es must compl y wi t h t he r equi r ement s of ASME B31. 3.

e. Poor Fi t - Up: Cut apar t i mpr oper l y f i t t ed par t s, and r ewel d.

3. 4. 1. 1 Met hods of Def ect Removal

The r emoval of wel d met al or por t i ons of t he base met al must be done pr ef er abl y by chi ppi ng, gr i ndi ng, sawi ng, machi ni ng, or ot her mechani cal means. Def ect s al so may be r emoved by t her mal cut t i ng t echni ques. I f t her mal cut t i ng t echni ques ar e used, t he cut sur f aces must be cl eaned and smoot hed by mechani cal means t o r emove t he heat af f ect ed zone. I n addi t i on, a maxi mum of 1/ 8- i nch of met al must be r emoved by mechani cal means f r om t he cut sur f aces of st ai nl ess st eel .

Wher ever a def ect i s r emoved, and r epai r by wel di ng i s not r equi r ed, t he af f ect ed ar ea must be bl ended i nt o t he sur r oundi ng sur f ace el i mi nat i ng shar p not ches, cr evi ces, or cor ner s.

SECTI ON 33 52 23. 15 Page 14

3. 4. 1. 2 Rewel di ng

Repai r wel ds must be made usi ng an el ect r ode or f i l l er wi r e smal l er t han t hat used i n maki ng t he or i gi nal wel d. Rewel di ng must be done usi ng qual i f i ed wel di ng pr ocedur es. The sur f ace must be cl eaned bef or e r ewel di ng. Repai r wel ds must meet t he r equi r ement s of t hi s speci f i cat i on.

3. 4. 1. 3 Peeni ng or Caul k i ng

The use of f or ce ( peeni ng) or f or ei gn mat er i al s t o mask, f i l l i n, seal , or di sgui se any wel di ng def ect s must not be per mi t t ed.

3. 5 MAI NTAI NI NG CLEANLI NESS OF PI PI NG

The Cont r act or must keep t he i nt er i or and ends of al l new pi pi ng af f ect ed by t he Cont r act or ' s oper at i ons t hor oughl y c l eaned of f or ei gn mat t er and wat er bef or e and af t er bei ng i nst al l ed. Pi pi ng syst ems must be kept c l ean dur i ng i nst al l at i on by means of pl ugs or ot her appr oved met hods. When wor k i s not i n pr ogr ess, open ends of pi pi ng and f i t t i ngs must be cl osed so t hat no wat er or ot her f or ei gn subst ance wi l l ent er t he pi pes or f i t t i ngs. Pi pi ng must be i nspect ed bef or e pl aci ng i nt o posi t i on. The i nt er i or of each l engt h of pi pe must be cl eaned af t er wel di ng; A swab, wi t h a l eat her or canvas bel t di sc t o f i t t he i nsi de di amet er of pi pe, must be pul l ed t hr ough each l engt h of pi pe af t er wel di ng i n pl ace. I t must be t he Cont r act or ' s r esponsi bi l i t y f or i nsur i ng t hat t he i nt er i or of t he pi pi ng i s f r ee of f or ei gn mat t er i ncl udi ng wel d s l ag when i t i s connect ed i nt o t he syst em.

3. 6 COMMI SSI ONI NG

For commi ssi oni ng of POL ser vi ce pi pi ng syst ems see Sect i on 33 08 55 FUEL

DI STRI BUTI ON SYSTEM START- UP ( NON- HYDRANT) .

- - End of Sect i on - -

SECTI ON 33 52 23. 15 Page 15

1.7.2 Damaged Materials