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QW-202.6 Tube-to-Tubesheet Qualification. When the applicable Code Section requires the use of QW-193 for tube-to-tubesheet demonstration mockup qualificatio tests, QW-193.1 shall apply. f specific qualification test requirements are not specifie by the applicable Code Section , tube-to-tube sheet !elds shall be qualified !ith one the follo!in" methods# (a) "roo$e !elds per the requirements of QW-%&%.% and QW-%&%.' (b) a demonstration mockup per the requirements of QW-193.1 (c) fillet !elds per the requirements of QW-%&%.%(c) (for non pressure retainin" tubetube sheet !elds only)
QW-193 Tube-to-Tube sheet Tests When the applicable Code Section requires the use of this para"raph for tube-totubesheet demonstration mockup qualification, QW-193.1 throu"h QW-193.1.3 shall apply. QW-193.1 Procedure Qualification Specimens. *en mockup !elds are required to qualify each procedure. *he mockup assembly shall essentially duplicate the tube ho confi"uration and the tube-to-tubesheet +oint desi"n !ithin the limits of the essential $ariables of QW-%. *he thickness of the mockup tubesheet is not required to be thicker than % in. (& mm) and the claddin" may be represented by base material of essentially equi$alent chemical composition to the claddin" composition. *he mocku !elds shall be submitted to the follo!in" tests sequentially and must meet the applicable acceptance criteria. QW-193.1.1 cceptance !riteria " #isual $%amination. *he accessible surfaces the !elds shall be eamined $isually !ith no ma"nification required. *he !elds shall sho! complete fusion and no e$idence of burnin" throu"h the tube !all, and shall be free from crackin" or porosity. QW-193.1.2 cceptance !riteria " &i'uid Penetrant. *he liquid penetrant eamination shall meet the requirements of Section /, 0rticle . *he !eld surfaces shall meet the requirements of QW-19.%. Sign up to vote this title !elds sha *heon mockup QW-193.1.3 cceptance !riteria " (acro- $%amination. sectioned throu"h the center of the tube for macro-eamination. four eposed Not useful Useful *he surfaces shall be smoothed and etched !ith a suitable etchant (see QW-'2&) to "i$e clear definition of the !eld and heat-affected one. 4sin" a ma"nification of 1&5 to %
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QW-19).2 &i'uid Penetrant cceptance !riteria QW-19).2.1 Terminolo*+ relevant indications # indications !ith ma+or dimensions "reater than 161 in. (1. mm linear indications # an indication ha$in" a len"th "reater than three times the !idth. rounded indications# an indication of circular or elliptical shape !ith the len"th equal or less than three times the !idth. QW-19).2.2 cceptance Standards. 7rocedure and performance tests eamined b liquid penetrant techniques shall be +ud"ed unacceptable !hen the eamination ehi any indication in ecess of the limits specified in the follo!in"# (a) rele$ant linear indications (b) rele$ant rounded indications "reater than 361 in.( mm) (c) four or more rele$ant rounded indications in a line separated by 161 in. (1. mm) less (ed"e-to-ed"e)
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,W-20 T,$-T-T,$S/$$T W$&S ,W-20.1 Scope. *hese rules pro$ide a basis for establishin" !eld sies and allo!ab +oint loads for full stren"th and partial stren"th tube-to-tubesheet !elds. ,W-20.2 efinitions UW-20.2(a) Full Strength Weld. 0 full stren"th tubeto- tubesheet !eld is one in !hic the desi"n stren"th is equal to or "reater than the aial tube stren"th, Ft . When the in a tube-to-tubesheet +oint meets the requirements of 4W-%&.', it is a full stren"th ! and the +oint does not require qualification by shear load testin". Such a !eld also pro$ides tube +oint leak ti"htness.
UW-20.2(b) Partial Strength Weld. 0 partial stren"th !eld is one in !hich the desi"n stren"th is based on the mechanical and thermal aial tube loads (in either direction) that are determined from the actual desi"n conditions. *he maimum allo!able aial load of this !eld may be determined in accordance !ith 4W-%&., 0ppendi 0, or 4W-1(d). When the !eld in a tube-to-tubesheet +oint meets the requirements of 4W %&. or 4W-1(d), it is a partial stren"th !eld and the +oint does not require qualificat by shear load testin". Such a !eld also pro$ides tube +oint leak ti"htness.
UW-20.2(c) Seal Weld. 0 tube-to-tubesheet seal !eld is one used to supplement an epanded tube +oint to ensure leak ti"htness. ts sie has not been determined based aial tube loadin". You're Reading a Preview described belo! are used for the desi"n of tu ,W-20.3 omenclature. *he symbols to-tubesheet !elds. Unlock full access with a free trial. ac 8 len"th of the combined !eld le"s measured parallel to the lon"itudinal ais of the tube at its outside diameter Download With Free Trial af 8 fillet !eld le" ag = "roo$e !eld le" ar 8 minimum required len"th of the !eld le"(s) under consideration d o 8 tube outside diameter Sign up to vote on this title F d 8 desi"n stren"th, but not "reater than F t f d 8 ratio of the desi"n stren"th to the tube stren"th Useful Not useful 8 1.& for full stren"th !elds 8 F d F t for partial stren"th !elds
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St 8 allo!able stress of the material to !hich the tube is !elded (see S, abo$e) Sw 8 allo!able stress in !eld (lesser of Sa or St , abo$e) t 8 nominal tube thickness
!"#$% For a welded tube or &i&e' use the allowable stress for the euivalent seale &roduct. When the allowable stress for the euivalent sealess &roduct is not availa divide the allowable stress of the welded &roduct b* 0.+,.
,W-20. ull Stren*th Welds. >ull stren"th !elds sho!n in >i". 4W-%&.1 shall conform to the follo!in" requirements# UW-20.(a) *he sie of a full stren"th !eld shall be determined in accordance !ith 4 %&.. UW-20.(b) *he maimum allo!able aial load in either direction on a tube-to-tubesh +oint !ith a full stren"th !eld shall be determined as follo!s# UW-20.(b)() >or loads due to pressure-induced aial forces, ma 8 F t. UW-20.(b)(2) >or loads due to thermally induced or pressure plus thermally induced aial forces# UW-20.(b)(2)(a) ma 8 F t for !elded only tube to- tubesheet +oints, !here the thickn throu"h the !eld throat is less than the nominal tube thickness t ? UW-20.(b)(2)(b) ma8 %F t for all other !elded tube-to-tubesheet +oints. You're Reading a Preview Unlock full access with a free trial.
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,W-20.) Partial Stren*th Welds. 7artial stren"th !elds sho!n in >i". 4W-%&.1 sha conform to the follo!in" requirements# UW-20.,(a) *he sie of a partial stren"th !eld shall be determined in accordance 4W %&.. UW-20.,(b) *he maimum allo!able aial load in either direction on a tube-to-tubesh +oint !ith a partial stren"th !eld shall be determined as follo!s# UW-20.,(b)() >or loads due to pressure-induced aial forces, mapFf ; Fg , but no "reater than Ft . UW-20.,(b)(2) >or loads due to thermally induced or pressure plus thermally induced aial forces# UW-20.,(b)(2)(a) mapFf ; Fg , but not "reater than Ft , for !elded only tube-totubesheet +oints, !here the thickness throu"h the !eld throat is less than the nomina tube thickness t ? UW-20.,(b)(2)(b) map%( Ff ; Fg ), but not "reater than % Ft , for all other !elded tub to-tubesheet +oints.
,W-20.6 Weld Si4e esi*n ormulas. *he sie of tube-to-tubesheet stren"th !eld sho!n in >i". 4W-%&.1 shall conform to the follo!in" requirements# UW-20./(a) >or fillet !elds sho!n in sketch (a), @ do < @ ar p @@&.2 do @% ; %.23t t fwfd < &.2do UW-20./(a)() >or full stren"th !elds, af shall not be less than the "reater of ar or You're Reading a Preview !elds, not be less than ar . UW-20./(a)(2) >or partial stren"th af shall UW-20./(b) >or "roo$e !elds sho!n in sketch (b), Unlock full access with a free trial. @ do < @ ar p @@&.2 do @% ; 1.2t t fwfd < &.2do UW-20./(b)() >or full stren"th !elds, ag shall not be less than the "reater of ar or Download With Freenot Trial !elds, ag shall be less than ar . UW-20./(b)(2) >or partial stren"th UW-20./(c) >or combined "roo$e and fillet !elds sho!n in sketch (c), !here af is eq to ag , @ do < t @ fwfd < &.2do @ ar p %@@@&.2 do @% ; 1.&2t up than to votethe on this title of ar or less "reater UW-20./(c)() >or full stren"th !elds, ac shall not beSign less than . UW-20./(c)(2) >or partial stren"th !elds, ac shall not Useful useful be Notar Calculate af and ag # af pac % and ag pac %. UW-20./(d) >or combined "roo$e and fillet !elds sho!n in sketch (d), !here af is n
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