Introduction to ASME VIII Div 1 (ATS).pdf

Introduction to ASME VIII Div 1 Pressure Vessels

1. INTRODUCTION TO ASME VIII DIV 1
FABRICATION & INSPECTION
(U, UG, UW & UCS)
Batam, 04 July 2023
1
(Ir. Decky Antony Kifta, ST, MM)

2. ASME SECTION VIII
RULES FOR CONSTRUCTION OF PRESSURE VESSELS
•ASME VIII Div. 1 is for Pressure Vessels with pressure above 15 psigto 3,000 psig(20 MPa)
•ASME VIII Div. 2 is for Pressure Vessels with pressure above 15 psigto 10,000 psig(70 MPa)
•ASME VIII Div. 3 is for Pressure Vessels with pressure above 10,000 psig(70 MPa)
•ASME VIII Div. 1 regulates stamps: U, UM, and PRT VIII-1.
•ASME VIII Div. 2 regulates stamps: U2 and PRT VIII-2
•ASME VIII Div. 3 regulates stamps: U3
•Requirements of Certification Markings of UV, UD, UV3 & UD3 were transferred to ASME XIII
•ASMEVIIIisissuedevery2years,thelatestonewasissuedon1
st
July2023andnextissuancewillbeon
1
st
July2025. TheEditionwillbeeffective6monthsafterissuance.
•Contract signed prior to the effective date may use the older edition.
•Revision is indicated by (Year) or (23) at the page margin.
Common PV standards other than ASME VIII
•PD 5500
•EN 13445
•AS 1210
2Ir. Decky Antony Kifta, ST, MM

3. ASME SECTION VIII DIV. 1
3Ir. Decky Antony Kifta, ST, MM
Certification Marks/ Stamps covered in this
Division (based on Year 2023 Edition)

4. ASME VIII Div. 1 is divided into 3 subsections:
•Subsection A: General Requirements
•Part UG: General Requirements for all methods of constructions and materials
•Subsection B: Requirements Pertaining to Methods of Fabrication PV
•Part UW : Welding
•Part UF : Forging
•Part UB: Brazing
•Subsection C: Requirements Pertaining to Classes of Materials
•Part UCS: Carbon & Low Alloy Steels
•Part UNF: Non-Ferrous Materials
•Part UHA: High Alloy Steels
•Part UCI: Cast Iron
•Part UCL: Cladding, Overlay Cladding & Linings
•Part UCD: Cast Ductile Iron
•Part UHT: Heat Treated enhanced Tensile Ferritic Steels
•Part ULW: Layered Construction
•Part ULT: Low Temperature
•Part UHX: Shell & Tube Heat Exchanger
•Part UIG: Impregnated Graphite
ASME SECTION VIII DIV. 1
4Ir. Decky Antony Kifta, ST, MM

5. [U-1] Vessels/pressure parts excluded from the scope are:
•Piping components (pipe, flange, fittings, valves, etc.)
•Vessels having an internal or external pressure not exceeding 15 psig.
•Vessels having inside diameter, width, height or cross-sectional diagram not exceeding 6 -in.
•Pressure vessels for human occupancy.
•Vessels having design pressure exceeding 3,000 psig.
[U-1(j) The requirements of UM pressure vessels.
ASME SECTION VIII DIV. 1
[U-2] User’s Design form and involvement of RPE is required when below conditions are design requirements:
•Superimposed static reactions
•Cyclic or dynamic reactions
•Loadings due to wind, snow or seismic reactions
•Impact reactions
•Temperature effects
•Abnormal pressures
[U-4] Units of Measurements
•U.S.Customary,SI,oranylocalcustomaryunitsmaybeusedtodemonstratecompliancewith
requirementsofthiseditionrelatedtomaterials,fabrication,andoverpressureprotection,however,only
oneorsinglesystemofunitsshallbeusedforallaspectsofdesignexceptotherwisepermittedbythis
Division.
5Ir. Decky Antony Kifta, ST, MM

6. SUBSECTION A
PART UG
GENERAL REQUIREMENTS FOR ALL METHODS OF CONSTRUCTION AND ALL
MATERIALS
6Ir. Decky Antony Kifta, ST, MM

7. ASME SECTION VIII DIV. 1
[UG-4] General:
•MaterialsusedshallconformwithASMESectIIPartD
•ASTM materials may be used provided conforming to
ASME Sect II Part A, Table II-200 -1, i.e. within the
year specified in the table. This is also applicable for
SB materials.
[UG-10]
•Materialidentifiedwithaspecificationnotpermittedby
thisdivisionandidentifiedtoasingleproductionlotas
permittedbyapermittedspecificationmaybeaccepted
provideddocumentationisprovidedtothepressure
manufacturerthatallapplicablechemicalandmechanical
propertiesmeetingthepermittedspecification. Whenno
documentationisavailablethePVmanufacturercan
performchemicalanalysisandmechanicaltestandthe
resultsarecomparedwithapermittedspecification.
[UG-5] Plate, [UG-6] Forgings, [UG-7] Castings, [UG- 8] Pipe and Tubes, and [UG-9] welding materials
7Ir. Decky Antony Kifta, ST, MM
[UG-10] Cont’d. •Pressure vessels manufacturer may re-certify and mark the materials to the permitted specification.
•Material without identification shall not be used.

8. ASME SECTION VIII DIV. 1
[UG-11 ]Prefabricatedandpreformeditemsmaybe
producedbyotherthanPVmanufacturerwithouta
certificationmarkaslongasnopermanentweldinginvolved.
Permanent welding including weld overlay, except for
welded shell, heads or QOC, may be subcontracted to non-
ASME stamped shop provided the requirements specified in
this section are satisfied (UG-11(e).
[UG-12] Bolts & Studs, [UG-13] Nuts & Washers, [UG-14]
Rods & Bars, [UG-15] Product Specification
[UG-16 to UG-34] Design Issues (not discussed) except UG-
20(f) below
8Ir. Decky Antony Kifta, ST, MM
[UG-20(f)] Impact test exemption for P-1
materials
•ImpacttestperUG-84isnotmandatory
forPVmaterialssatisfyingthebellow:
•ThematerialshallbelimitedtoP-1gr.1
&2andthicknessshallnotexceed:
•13mmmaterialsforcurveA
•25mmmaterialsforcurveB
•ThePVshallbehydro-tested&designed
temp.Shallbefrom-29to345°C.
[UG-35] Other Type of Closures
•Dished Covers (Dished head with bolting flanges)
•Quick Actuating Closures
•Quick Opening Closures (QOC)
[UG-36 to UG-53] Design Issues (not discussed)

9. ASME SECTION VIII DIV. 1
[UG-54] Supports:
Allvesselsshallbesupported,andthesupportingmembersshallbeattachedtowithholdmaximumimposed
loadings.
[UG-55 ]Lugsforplatforms,ladders,andotherattachmentstovesselwalls
Lugs or clips may be welded, brazed, or bolted to the outside or inside of the vessel support ladders,
platforms, etc.
[UG-76] Cutting plates and other stock
Plates,edgesofheads,andotherpartsmaybecuttoshapeandsizebymechanicalmeanssuchas
machining,shearing,grindingorbyoxygenorarccutting.Afteroxygenorarccuttingallslagsand
detrimentaldiscolorationshallberemovedbymechanicalmeans.
[UG-77] Material identification Themanufacturershallmaintaintraceabilityofthematerialstotheoriginalidentificationmarkingsbyeither
orcombinationof:[1]accuratetransferofidentification(heatno.),[2]useofcodedmarking(uniqueno.)
traceabletotheoriginalmarking,[3]recordingthematerialidentificationonthetabulation(traceability
sheet)orasbuiltdrawingswhichensurethatidentificationofeachmaterialduringfabricationtovessel
completion.
9Ir. Decky Antony Kifta, ST, MM

10. ASME SECTION VIII DIV. 1
[UG-78] Repair of Defects in Materials
Defects in material may be repaired provided accepted by AI (Authorized Inspector)
[UG-79] Forming Pressure Parts
Shellsorheadsmayberolledorformedprovidedextremefiberelongation(formingstrains)areobserved
andwhenrequiredsubsequentheattreatmentshallbeperformed.
[UG-80] Permissible Out-of-Roundness of Cylindrical, Conical and Spherical Shells
Thedifferencebetweenthemaximumandminimuminsidediametersatanycrosssectionshallnotexceed
1%ofthenominaldiameteratthecrosssectionunderconsideration.
10Ir. Decky Antony Kifta, ST, MM

11. ASME SECTION VIII DIV. 1
[UG-81] Tolerance for Formed Heads
Theinnersurfaceofheadshallnotdeviateoutsideofthespecifiedshapebymorethan1-1/4%ofDnor
insideofthespecifiedthespecifiedshapebymorethan5/8%ofD,whereDisthenominalinsidediameter
ofthevesselshellatpointofattachment.
[UG-82] Lugs & Fitting Attachments
[UG-84] Charpy Impact Test
•Test procedure to follow: ASME SA-370 or ISO 148
•Test specimen shall be as per Fig. UG-84 & Fig. UG-84.5
•Acceptance criteria shall be as per Fig. UG-84.1
•Whenimpacttestonproductionrequiredonetestplateshallbemadeforeachweldingprocedureused
forCategoryAandB,however,whenmanufacturerusessameweldingprocedureforbothcategories,
onlyCategoryAcanrepresentthetestplate.[UG-84 (i)(1)–(3)].
•Forproductionweldimpacttest,thetesttobeperformedonweldmetalandheataffectedzone.
[UG-85] Heat Treatment Heat treatment of plate may be performed by PV manufacturer
11Ir. Decky Antony Kifta, ST, MM

12. ASME SECTION VIII DIV. 1
[UG-90] Inspection and Tests: Manufacturer’s responsibility
(1)MaintainCertificateofAuthorization
(2)Preparedrawings&designcalculations
(3)Materialsidentificationsusedfor
Construction
(4)ObtainPartialDataReports(ifany)
(5)PrepareaccessfortheInspector
(6)Examinationofmaterials,materials
identification,andtraceability.
(7)Documentimpacttestsandothertests
(8)ConcurrenceoftheInspectorpriortoany
basemetalrepairs.
(9)Examinationofheads&shellsareproperly
formed.
(10)Qualificationofweldingprocedures
(11)Qualificationofwelders&welding
operators
(12)Examinationofallpartspriortojoiningforwelding
(13)Examinationofpartsformaterialmarking,defects,
anddimensionalgeometry.
(14)Provisionsofcontrolstoensurethatallrequired
heattreatmentsareperformed.
(15)ProvisionsofrecordsofNDTincludingRTimages.
(16)Makingtherequiredhydrotestorpneumatictest&
arrangingwitnessbytheInspector.
(17)Applyingtherequiredstamping/nameplatetothe
vessel
(18)PreparingtherequiredManufacturer’sData
Reports&certifyingbyInspector
(19)ProvidingtheretentionofRT&UTreports
Manufacturer’sDataReportsandotherrecords.
12Ir. Decky Antony Kifta, ST, MM

13. ASME SECTION VIII DIV. 1
[UG-93] Inspection of Materials
•Plates shall require materials test reports
•All other product forms can be accepted when the product has the correct marking of specification
including grade, type and class of the materials.
[UG-92] Inspection of Materials
•Manufacturer shall arrange free access to AI for performing inspection on PV.
[UG-91] The Inspector
•Individual employed by ASME Accredited Authorized Inspection Agency (AIA) as per ASME QAI-1.
[UG-94] Marking on Materials
•Ifthematerialidentifyingmarksareobliteratedormaterialisdividedintotwoormoreparts,themarks
shallbeproperlytransferredbytheManufacturer.
[UG-95 ]Examinationofsurfacesduringfabrication,[UG-96]Dimensionalcheckofcomponentparts&[UG-
97]InspectionDuringFabrication.
13Ir. Decky Antony Kifta, ST, MM

14. ASME SECTION VIII DIV. 1
[UG-98] Maximum Allowable working pressure
•MAWPisthemaximumpressurepermissibleatthetopofthevesselinitsnormaloperatingpositionat
thedesignatedcoincidenttemperaturespecifiedforthatpressure.
[UG-99] Standard Hydrostatic Test
•Vesselsdesignedforinternalpressureshallbesubjectedtoahydrostatictestpressurethatateverypoint
inthevesselisatleastequalto1.3xMAWPmultipliedbyLSR(LowestStressRatio)forthepressure
boundarymaterialsofwhichthevesselisconstructed.
•Thevesselshallnotbehydrotestedwithpaintorinternalliningunlessapprovedbyuserorhisdesignated
agent.
•Theminimumtemperatureduringhydrotestshallbe17°CwarmerthanMDMTandmaximumtest
temperatureis48°C.
•Vessel with Lethal service shall not be painted or internally lined prior to hydrotest.
14Ir. Decky Antony Kifta, ST, MM

15. Ir. Decky Antony Kifta, ST, MM 15
[UG-100] Pneumatic Test
•Vesselsshallbepneumatictestedthatateverypointinthevesselisatleastequalto1.1xMAWP
multipliedbyLSR(LowestStressRatio)forthepressureboundarymaterialsofwhichthevesselis
constructed.
•Thevesselshallnotbepneumatictestedwithpaintorinternalliningunlessapprovedbyuserorhis
designatedagent.
•Theminimumtemperatureduringhydrotestshallbe17°CwarmerthanMDMTandmaximumtest
temperatureis48°C.
•Vessel with Lethal service shall not be painted or internally lined prior to pneumatic testing.

16. ASME SECTION VIII DIV. 1
16Ir. Decky Antony Kifta, ST, MM
Hydrotest Operation

17. ASME SECTION VIII DIV. 1
[UG-101] Proof Tests to establish MAWP
•WheredesignruledonotexistinthisDivisionthereforethisprooftestmethodtobeperformed[U-2
(g)(1)]
[UG-102] Test Gages
•Dialindicatingpressuregageusedintestingshallbegraduatedoverarangeofaboutdoblethe
intendedmaximumtestpressure,butinnocaseshalltherangebelessthan1-1/2nor4timesthat
pressure.Digitalreadingpressuregageshavingwiderrangeofpressuremaybeused,providedthe
readingsgivethesameorgreaterdegreeofaccuracyasobtainedwithdialpressuregage.
[UG-103] NDT
•MPI shall be performed as per Mandatory Appendix 6 and PT shall be as per Mandatory Appendix 8.
[UG-115] Marking and Reports
•TheunitofmeasurementusedinManufacturer’sDataReports(UStamp),Manufacturer’sCertificatesof
Compliance(UMStamp)andcapacitycertificationofpressurereliefdevicesandinmarkingorstamping
pressurevessels,vesselpartsandpressurereliefdevices,requiredbythisDivision,shallbeeitherUS
CustomaryUnitsoranylocalcustomaryunitsandasinglesystemofunitsshallbeusedforallaspectsof
design[U-4(b)]
17Ir. Decky Antony Kifta, ST, MM

18. ASME SECTION VIII DIV. 1
[UG-116] Required Marking
•EachPVshallbemarkedwiththefollowing
[UG-116] Required Marking
•WhenRTorUTexaminationhasbeenperformed
•RT-1whenallpertainingbuttweldsotherthanCategoryBandCbuttweldsassociatedwithnozzlesand
communicatingchambersthatneitherexceedsNPS10nor1-1/8in.wallthicknesssatisfythefullRT
requirementsfortheirfulllength[UW-11(a)]
18Ir. Decky Antony Kifta, ST, MM

19. ASME SECTION VIII DIV. 1
[UG-116] Required Marking (Cont’d)
•RT-2whenthecompletevesselsatisfiesthe
requirementUW-11(a)(5)(fullRTonLS)and
whenthespotradiographyrequirementsof
UW-11(a)(5)(-b)(spotRToncircseamwhich
intersectwithLS)havebeenapplied.
•RT-3whenthecompletePVsatisfiesthespotRT
asperUW-11b.
•RT-4whenonlypartofthecompletePVhas
satisfiedtheRT[UW-11(a)]orwherenoneof
themarkingsRT-1,RT-2orRT-3areapplicable.
[UG-116] Required Marking (Cont’d)
•PartsofvesselsforWhichpartialDataReports
arerequiredinUG-120 (c)shallbemarkedby
themanufacturerofthepart,withanameplate
orstamping,withthefollowing:
•TheUDesignatorshallstamptheword
‘PART’belowtheCertificationMark.
•ThePRTDesignatorshallstampthename
ofthemanufacturerafter/belowthe
words‘certifiedby’andthemanufacturer’s
serialnumber.ThewordPARTmaynotbe
stamped.
19Ir. Decky Antony Kifta, ST, MM

20. ASME SECTION VIII DIV. 1
[UG-117] Certificates of Authorization and
Certification Marks
•UMCertificationMarkisgrantedbythe
Societyandisusedbythemanufacturer
•UMDesignatorshallemployaCertified
IndividualqualifiedtoASMECA-1andmeeting
therequirementsofASMEQAI-1
•CertifiedIndividualshallcertifyFormU-3,U-
3AorU-3P(Manufacturer’sCertificateof
Compliances)
•UMDesignatorshallalreadyhaveSorU
certificate.
•UMcertificationisvalidfor1yearbutthe1
st
and2
nd
reviewscanbedonebyAIandAI
Supervisor.Thethirdrevieworjointreviewwill
beperformedafter3years
•AnyManufacturerholdingU,UM&PRTVIII-1
CertificationmarksshallhaveQCSystem
(Manual)asperAppendix10&ASMECA-1.
[UG-118 & 119] Methods of Stamping & Nameplate
•Therequiredmarkingshallbeappliedbyoneofthe
followingmethods:
•Nameplate
•Stampeddirectlyonthevessel
•Electrochemicallyetched
20Ir. Decky Antony Kifta, ST, MM

21. ASME SECTION VIII DIV. 1
21Ir. Decky Antony Kifta, ST, MM
U stamp Nameplates (Samples)

22. ASME SECTION VIII DIV. 1
22Ir. Decky Antony Kifta, ST, MM
[UG-120] Date Reports
•Manufacturer’sDatareportstobefilledbyU
Designatorare:
•FormU-1,U-1AorU-1P(PlateHeat
Exchanger)andU-4(attachment)when
required.
•FormU-5forFixedTubeSheetHeat
Exchanger
•Manufacturer’sCertificateofCompliancetobe
issuedbyUMDesignatorare:
•FormU-3,U-3AorU-3P
•PartsmanufacturershallfillinFormU-2orU-
2A.
[UG-120] Date Reports (Cont’d) •UDesignatorshallmaintaintheManufacturer’s
DataReportsforatleast3years
•UM Designatorshallmaintainthe
Manufacturer’sCertificateofComplianceforat
least5years.
•Vessel(UorUM)toberegisteredtoNational
Board,theManufacturer’sDataReportsor
Manufacturer’sCertificateofComplianceshall
besenttoNationalBoardofBoilerand
PressureVesselInspectorinOhio,USA.
[UG-150 to 156] regarding the pressure relieve valves or devices (not discussed)

23. SUBSECTION B
PART UW
REQUIREMENTS PERTAINING METHODS OF FABRICATION OF PRESSURE VESSELS
23Ir. Decky Antony Kifta, ST, MM

24. ASME SECTION VIII DIV. 1
24Ir. Decky Antony Kifta, ST, MM
[UW-2] Service Restrictions
•PVcontainslethalsubstances,allbuttwelds
shallbefullyradiography
•Whenfabricatedusingcarbonorlowalloy
materials,PVshallbePWHTatanywall
thickness
•Themeaningoflethalisliquidorgasthata
verysmallamountmixedornotmixedwithair
isdangeroustolifewheninhaled.
[UW-3] Welded Joint Category
•CatA=longitudinalweldedjoint(shell&
head)andcircseamshelltoheadsotherthan
thedishedhead.
•CatB=circumferentialweldedjoint
•CatC=weldconnectingflanges,flatheadto
mainshell.
•CatD=weldconnectingnozzlestomainshells,
toheads

25. ASME SECTION VIII DIV. 1
25Ir. Decky Antony Kifta, ST, MM
[UW-5 & UW-6] Materials and Weld Consumables (not discussed)
[UW-8 & UW-9] Design (not discussed)
[UW-10] PWHT, refer to UW-40 and UCS-56 (for carbon and low
alloy steels)
[UW-11] Radiography and Ultrasonic Examination
•Full radiography to be performed on:
•All butt welds in the shell and heads of vessels to contain
lethal substances
•All butt welds in the shell and heads of vessels with
thickness exceed 1-1/2 in (38 mm) or for carbon and low
alloy steels as per Table UCS-57.
[UW-12] Joint Efficiencies
•Refer to Table UW-12 below
PAUT (Phased Array UT)

26. ASME SECTION VIII DIV. 1
26Ir. Decky Antony Kifta, ST, MM

27. Ir. Decky Antony Kifta, ST, MM 27
[UW-13] Attachment Details not designed
[UW-14] Openings in or adjacent to welds
•Singleopeningmaybelocatedinhead-to-shellorCategoryBorCbutt-welded joints,providedtheweld
meetstheradiographicrequirementsinUW-51foralengthequaltothreetimesthediameterofthe
openingwiththecenteroftheholeatmidlength. Defectsthatarecompletelyremovedincuttingthehole
shallnotbeconsideredinjudgingtheacceptabilityoftheweld.
[UW-15 to UW-20] regarding design (not discussed)

28. ASME SECTION VIII DIV. 1
28Ir. Decky Antony Kifta, ST, MM
[UW-26] Fabrication
•Eachmanufacturershallberesponsibleforthequalityoftheweldingdonebytheorganization
•AllweldingshallbeperformedinaccordancewithManufacturer’sWPSinaccordancewithASMEIX.
•AllweldersshallbequalifiedbythemanufacturerinaccordancewithASMEIX
•ThemanufacturershallberesponsibleforCodecomplianceofthevesselorpart,includingCertification
MarkStampingandprovidingManufacturer’sDataReportFormsproperlyandcountersignedbythe
Inspector.
[UW-27] Welding Processes
•The welding processes that may be used in the construction of vessel are limited to those listed in ASME IX.
[UW-28] Qualification of welding procedure
•Eachweldingprocedureusedinjoiningpressurepartstopressurepartsorjoiningpressurepartstoload
carryingnon-pressureparts,shallberecordedindetailbythemanufacturerandqualifiedinaccordance
withASMEIX.

29. ASME SECTION VIII DIV. 1
29Ir. Decky Antony Kifta, ST, MM
[UW-29] Tests of welders and welding operators
•Theweldersandweldingoperatorsusedin
weldingpressurepartsandinjoiningload-
carryingnon-pressurepartstopressureparts
shallbequalifiedinaccordancewithASME
IX.
•Eachwelderandweldingoperatorshallbe
assignedanidentifyingnumber,letter,or
symbolbythemanufacturerwhichshallbe
usedtoidentifytheworkofthatwelderor
weldingoperator.
•Themanufacturershallmaintainarecordof
theweldersandweldingoperatorsshowing
thedateandresultsoftestsandidentification
markassignedtoeach.
[UW-30] Lowest permissible temperature for
welding
•Itisrecommendedthatnoweldingofany
kindbedonewhenthetemperatureofthe
basemetalislowerthan-20°C.Attemp.
between0°Cand-20°C,thesurfaceofall
areaswithin75mmofthepointwherea
weldistobestartedshouldbeheatedtoa
temp.atleastwarmtothehand(about15
°C)beforeweldingisstarted.
[UW-31] Cutting, Fitting, and Alignment
•Whenplatesareshapedbyoxygenorarc
cutting,theedgestobeweldedshalluniform
andsmoothandshallbefreeofallloose
scaleandslagaccumulationsbeforewelding.

30. ASME SECTION VIII DIV. 1
30Ir. Decky Antony Kifta, ST, MM
[UW-32] Cleaning of Surfaces to be welded
•Thesurfacestobeweldedshallbecleanand
freeofscale,rust,oil,grease,slag,
detrimentaloxides,andotherdeleterious
foreignmaterial.
[UW-33] Alignment Tolerance
•Alignmentofsectionsatedgestobebutt
weldedshallbesuchthatmaximumoffsetis
notgreaterthattheapplicableamountfor
theweldedjointcategoryunderconsideration
(RefertoTableUW-33).
•Anyoffsetwithintheallowabletolerance
providedinthetableaboveshallbefaired
atathreetoonetaperoverthewidthofthe
finishedweld,orifnecessary,byadding
additionalweldmetal(buildup)beyondwhat
wouldotherwisebetheedgeoftheweld.
Table UW-33
[UW-32] Finished Longitudinal and Circumferential
Joints
•Butt-welded jointsshallhavecomplete
penetrationandfullfusion.As-weldedsurfaces
arepermitted,however,thesurfaceofwelds
shallbesufficientlyfreefromcoarseripples,
grooves,overlaps,andabruptridgesand
valleystopermitproperRTinterpretationand
NDTinspections.

31. ASME SECTION VIII DIV. 1
31Ir. Decky Antony Kifta, ST, MM
[UW-32] Finished Longitudinal and Circumferential
Joints (Cont’d)
•Butt-welded jointsshallhavecomplete
penetrationandfullfusion.As-weldedsurfaces
arepermitted,however,thesurfaceofwelds
shallbesufficientlyfreefromcoarseripples,
grooves,overlaps,andabruptridgesand
valleystopermitproperRTinterpretationand
NDTinspections.
•Reductioninthicknessshallnotreducethe
materialofadjoiningsurfacesbelowthedesign
thicknessatanypoint.
•Reductioninthicknessshallnotexceed1mmor
10%ofthenominalthicknessoftheadjoining
surface,whicheverisless.
•Thethicknessoftheweldreinforcementoneach
faceshallnotexceedthebelowtable.
[UW-36] Fillet welds
•Filletweldshallbedepositedinsuchaway
thatadequatepenetrationintothebase
metalattherootoftheweldissecured.

32. ASME SECTION VIII DIV. 1
32Ir. Decky Antony Kifta, ST, MM
[UW-37] Miscellaneous Welding Requirements
•Eachwelderandweldingoperatorshallstamp
theidentifyingnumber,letter,orsymbol
assignedbythemanufacturer,onoradjacentto
andatintervalsofthemanufacturer,onor
adjacenttoandintervalsofnotmorethan1m
alongtheweldswhichhemakesinsteelplates
6mmandoverinthicknessandinnonferrous
plates13mmandoverinthickness;orarecord
shallbekeptbytheManufacturerofwelders
andweldingoperatorsemployedoneachjoint
whichshallbeavailabletotheInspector.For
identifyingweldsonvesselsinwallthicknessis
lessthan6mmforsteelmaterialandlessthan
13mmfornonferrousmaterial,suitablestencil
orothersurfacemarkingsshallbeused;ora
recordshallbekeptbytheManufacturerof
weldersandweldingoperatorsemployedon
eachjointwhichshallbeavailabletothe
Inspector.
[UW-37] Miscellaneous Welding Requirements
•TheManufacturer’sQualityControlSystem(QC
Manual)includesaprocedurethatwillidentify
theweldersorweldingoperatorsthatmade
suchweldsoneachvesselsothattheInspector
canverifythattheweldersorwelding
operatorswereallproperlyqualified.
•Permanentidentificationofweldersorwelding
operatorsmakingtackweldsthatbecomepart
ofthefinalpressureweldisnotrequired
providedthemanufacturer’sQualityControl
Systemincludesaproceduretopermitthe
Inspectortoverifythatsuchtackweldswere
madebyqualifiedweldersorwelding
operators.

33. ASME SECTION VIII DIV. 1
33Ir. Decky Antony Kifta, ST, MM
[UW-38] Repair of Weld Defects
•Defects,suchascracks,pinholes,andincomplete
fusion,detectedvisuallyorbythehydrostaticor
pneumatictestorbytheexamination
prescribedinUW-11shallberemovedby
mechanicalmeansorbythermalgouging
processes,afterwhichthejointshallbe
rewelded.Re-weldedmayusegroove
WPS/PQR[ASMEIX–QW-202.3]
[UW-39] Peening
•Weldmetalandheataffectedzonesmaybe
peenedbymanual,electric,orpneumaticmeans
whenitisdeemednecessaryorhelpfulto
controldistortion,torelieveresidualstresses,or
toimprovethequalityoftheweld.
•PeeningisnotperformedinlieuofanyPWHT
requiredbythisCode.
[UW-40] Procedures for PWHT
•Heatingthevesselinanenclosedfurnace
•Heatingthevesselinmorethanoneheatina
furnace,providedtheoverlapoftheheated
sectionsofthevesselisatleast5feet(1.5M).
•PartialPWHT
•Internalfiring
•Localizedheating
•PWHTshallbedonebeforehydrostatictest
andafteranyweldedrepairs.
[UW-41] Sectioning of welded joints
•Weldedjointmaybeexaminedbysectioning
whenagreedbyuserandmanufacturer.

34. ASME SECTION VIII DIV. 1
34Ir. Decky Antony Kifta, ST, MM
[UW-42] Weld Metal Buildup
•Weldmetalbuildupispermittedtobe
performedontheconstructionbasemetaland
weldtorestorethethicknessofbasemetalfor
strengthconsiderationortomodifythe
configurationofweldsuchastapertransition,
etc.providedthatagrooveweldingprocedure
qualificationisavailableandcoveringthe
thicknessofweldmetaldeposited.
•Allweldmetalsurfacesshallbebuildupshall
beexaminedbyMTorPT.Whenthebuildup
incorporatedintotheweldjointrequiresRT(full
orspot),theweldmetalbuildupcanbe
included.Weldmetalbuildupweldingshallmay
usegrooveWPS/PQR[ASMEIX–QW-202.3]
Inspection and Tests
[UW-47] Check of Welding Procedure
•TheInspectorshallensurethattheWelding
Procedureemployedintheconstructionhas
beenqualifiedtoASMEIX.
[UW-48]CheckofWelderandWeldingOperator
Qualification
•TheManufacturershallcertifythatallthe
weldersandweldingoperatorsemployedin
constructionarequalifiedforASMEIX.
•TheInspectorshallhaveaccesstocheckthe
welder’sorweldingoperator’srecords.
[UW-49]CheckofPWHTPractice
•TheInspectorshallcheckandverifythePWHT
practice

35. ASME SECTION VIII DIV. 1
35Ir. Decky Antony Kifta, ST, MM
[UW-50] NDE on welds of Pneumatically tested
Vessels
•Onweldedvesselstobepneumaticallytested
theMPIorPTtobetestedon:
•Allweldsaroundtheopening
•Filletweldsofpressurepartswiththroat
thicknessofmorethan6mm
•Exemptionmaybegiventovesselswith
MAWPnotgreaterthan500psig.
[UW-51] RT of weld joints
•ExaminationtobeperformedasperASMEV,
Article2.
•DefectsrevealedbyRTexceedingthespecified
criteriashallberepaired
•UTmaybeusedasanalternativeprovided
complyingwithmethodsspecifiedinUW-53(b)
[automatedorsemi-automatedUT]andUW-
53(c)[PAUT]
[UW-52] Spot examination of weld joints
•Onespotshallbeexaminedoneachvesselfor
each50ft(15m)incrementofweld
•Foridenticalvessels50ft(15m)incrementwill
betakenacrossallvesselswelds.
•Theminimumlengthofthespotradiography
shallbe6in.(150mm)
•Theacceptabilityofweldsexaminedbyspot
radiographyshallbeaspertheseparagraphs.
•Whenrepairisfoundonthespotradiography,
twoadditionalspotsshallberadiography.
•Ifeitherofthetwoadditionalspotsreveals
repair,theentireincrementofweldrepresented
shallberejected.
[UW-53] Ultrasonic examination of welded joints
•Ultrasonicexaminationofweldsperformedin
lieuofRT[asperUW-51(a)(4)]shallbeasper
ASMEVIIIDiv.2para7.5.5(automaticorsemi-
autoUT)orbyusingofPAUT.

36. ASME SECTION VIII DIV. 1
36Ir. Decky Antony Kifta, ST, MM
SUBSECTION C
PART UCS
REQUIREMENTS FOR PRESSURE VESSELS CONSTRUCTED OF CARBON AND LOW
ALLOY STEELS

37. ASME SECTION VIII DIV. 1
37Ir. Decky Antony Kifta, ST, MM
Materials
[UCS-5] General
•Allcarbonandlowalloysteelmaterialusedfor
pressurevesselsshallbeasperASMEIIand
limitedtoTableUCS-23exceptaspermittedin
UG-10 &UG-11
[UCS6toUCS-12]Theseparagraphsexplainthe
materialssimilartoUCS-5requirements,therefore,
notdiscussed.
Design
[UCS-16 to UCS-33] Not discussed

38. ASME SECTION VIII DIV. 1
38Ir. Decky Antony Kifta, ST, MM
[UCS-56] Requirements for PWHT
•Thetemperatureofthefurnaceshallnotexceed
425°Cwhenthevesselisplacedinthefurnace
•Above425°C,theheatingrateshallbenotmore
than222°C/hrdividedbyPVmax.thickness.
Duringtheheating,thetempvariationshallbe
max.140°Cwithinany4.6m.
•Holdingtemp.shallbeasperTableUCS-56-1
andthetemp.variationduringtheholdingtemp.
shallbewithin83°C.
•Above425°C,thecoolingrateshallbenotmore
than280°C/hrdividedbyPVmax.thickness.
Duringthecooling,thetempvariationshallbe
max.140°Cwithinany4.6m.
•Repair,afterPWHTcanbeperformedwithout
subsequentre-PWHT,providedthevesselis
madefromPNo.1Group1,2,and3materials
andtotalrepairdepthshallnotexceed1-1/2in
thickness.

39. ASME SECTION VIII DIV. 1
39Ir. Decky Antony Kifta, ST, MM
Furnace PWHTPWHT Internal Firing
Localized Heating Band
PWHT

40. ASME SECTION VIII DIV. 1
40Ir. Decky Antony Kifta, ST, MM
TableUCS-56.1AlternativeHeatTreatment
RequirementsforCarbonandLowAlloySteels.
Theholdingtemperaturemaybedecreased,
however,theholdingtimewillbecomelonger.
[UCS-57] Radiography examination
•InadditiontotherequirementofUW-11,a
completeradiographyexaminationisrequired
forPVwiththickness:seebelowTableUCS-57

41. ASME SECTION VIII DIV. 1
41Ir. Decky Antony Kifta, ST, MM
Low-Temperature Operation
[UCS-66 to UCS-68] Impact test Exemption
•ImpactexemptionbasedonUG-20(f)
•ImpactexemptionbasedonFig.UCS-66and
TableUCS-66.
•Reductiontempbasedonthecoincidentratio
whentheratio<1,areductiontoexemptionmay
begivenasperFig.UCS-66.1.DeducttheMDMT
fromTableUCStofindthenewMDMTexempted
fromtheimpacttest.
•[UCS-68(c)]allowsreductiontemp.by17°C
whenthematerialistobestressrelieved(without
Coderequirements)
Low-Temperature Operation –for example
[UCS-66 to UCS-68] Impact test Exemption
•MaterialofSA516-70Normalizedwiththickness32
mm,coincidentratio0.64,andthevesselwillbe
PWHTasperClientrequest,whatwillbetheMDMT?
•AsperFig.UCS-66materialSA516-70belongs
toCurveD
•BasedonTableUCS-66CurveDwithathickness
of32mmshowingMDMTof-30°C
•AsperFig.UCS-66.1withthecoincidentratioof
0.64willgiveareductionof20°C,thiswillgive
newMDMTof-30–20°Cbecomes-50°
•Thevesselwillbeheattreatedandwhen
performedthefinalMDMTwillbe-50-17°C=
-67°C[RefertoUCS68(c)].

42. Ir. Decky Antony Kifta, ST, MM 42
Figure UCS-66M

43. Ir. Decky Antony Kifta, ST, MM 43
Table UCS-66 Figure UCS-66.1M
-30 °C
Reduction 20 °C

44. ASME SECTION VIII DIV. 1
44Ir. Decky Antony Kifta, ST, MM
Fabrication
[UCS-75 to UCS-79]
•Carbon&lowalloysteelplatesshallnotbe
formedcoldbyblows,however,maybeformed
byblowsataforgingtemperature.
•PNo.1GrNo.1&2materialsheattreatmentis
requiredwhenextremefiberelongationof
formingexceeds40%oriftheextremefiber
elongationexceeds5%andanyofthefollowing
conditionsexist:
•Thevesselwillcontainlethalsubstances
•Materialrequiresimpacttest
•Nominalthicknessbeforecoldforming
exceeds16mm.
•Thethicknessreductionbycoldformingis
morethan10%atanylocationwherethe
extremefiberelongationexceeds5%.
[UCS-85]
•Thematerialusedinthevesselshallbe
representedbytestspecimensthathavebeen
subjectedtothesameheattreatmentsexceeding
900°F(480°C),exceptasexemptedbelow:
•ThematerialsbelongtoPNo.1Gr.1&2and
allcarbonandlowalloysteelsusedinthe
annealedconditionaspermittedbythematerial
specificationareexemptfromtheabovetesting
requirementprovidedthatheattreatmentsare
limitedtoPWHTatbelowlowertransformation
temp.ofthesteel,exceptforSA-841.

45. ASME SECTION VIII DIV. 1
45Ir. Decky Antony Kifta, ST, MM
MANDATORY APPENDIX 47

46. ASME SECTION VIII DIV. 1
46Ir. Decky Antony Kifta, ST, MM
Mandatory Appendix 47
•CertifyingEngineer
•AsRPEregisteredinUSAorCanada,or
•AuthorizedmemberoftheInternational
ProfessionalEngineersAgreement(IPEA),or
•AuthorizedmemberofAsiaPacificEconomic
Operation(APEC),or
•AuthorizedmemberoftheEuropean
FederationofNationalEngineering
Association(FEANI)
•Shallhave4yearsormoreexperienceinPV
design.
•Engineer
•Shallhaveadegreefromanaccredited
universityorcollegeinengineering,science,
ortechnologywith4yearsoffull-timestudy,
andhaving4yearsofexperienceinPV
design.
Mandatory Appendix 47 (cont’d) •Designer
•Shallhavecompletedanaccredited
engineeringtechnicianorassociatedegree,
requiring2yearsofstudy,plushavea
minimumof6yearsofexperienceinthePV
design,or
•Shallhaveaminimumof10yearsof
experienceinPVdesign.

47. ASME SECTION VIII DIV. 1
47Ir. Decky Antony Kifta, ST, MM
THANK YOU