Step by Step Methods for WRC 107 and WRC 297 Checking in Caesar II

6/25/2015 StepbyStepMethodsforWRC107andWRC297CheckinginCaesarII

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Introduction:WheneverPressure Vessel orHeat exchanger(StaticEquipments)nozzle loadsexceeds theallowable valuesprovided byVendors(Equipmentmanufacturer) orstandard projectspecific tables(guidelines), thepiping stressprofessional ispermitted touseWRC107/297 (oranyotherFEA) tocheckthestressesat theNozzle-Shell junctionpointandcheckthestresseswithallowablevaluesprovidedbyCodes.Ifthestressesarefoundtobewithinallowable limitthentheloadandmomentvaluescanbeacceptedwithoutanyhesitation.However thereare someboundary conditionswhichmustbemetbeforeusingWRC.Thissmallwriteupwilltrytoexplaintherequireddetails forperformingWRC107andWRC297usingCaesar IIandstepbystepmethodforperformingWRCcheck.BothWRC107andWRC297 dealwithlocalstressstatesinthevicinityofanattachmenttoavesselorpipe.As indicatedby their titles,WRC-107canbeused forattachments tobothspherical and cylindrical shells while WRC-297 only addresses cylinder tocylinder connections.Whilebothbulletinsareused fornozzle connection.WRC-107isbasedonun-penetratedshell,whileWRC-297assumesacircularopening in vessel. Furthermore, WRC-107 defines values for solid andhollow attachments of either round and rectangular shape for sphericalshellsbutdrops thesolid/hollowdistinction forattachments to cylindricalshells.WRC-297,ontheotherhand, is intendedonlyforcylindricalnozzlesattachedtocylindricalshells.BoundaryconditionforusingWRC107:To determine whether WRC 107 bulletin can be used for local stresscheckingthefollowinggeometryguidelinesmustbemet:1.d/D50 (Here, T=Vessel Thickness, Dm=mean diameter ofvessel)BoundaryconditionforusingWRC297:To determine whether WRC 107 bulletin can be used for local stresscheckingthefollowinggeometryguidelinesmustbemet:1.d/D



1.d/D=20andd/t=20andD/T=55. Nozzlemust be isolated (it may not be close to a discontinuity) notwithin2(DT)onvesselandnotwithin2(dt)onnozzleDifferencebetweenWRC107and297:The major differences other than the boundary conditions mentionedabovearelistedbelow:1. WRC 107 calculates only the vessel stresses while WRC 297 calculatesVesselstressesalongwithnozzlestresses.2.WRC297isapplicableonlyfornormally(perpendicular)intersectingtwocylindrical shells whereasWRC 107 is applicable for cylindrical as well assphericalshellsofanyintersection.3. The attachments for WRC 297 checking must be hollow but WRC 107analyzes cylindrical or rectangular attachments which can be rigid orhollow.4.WRC297isnotapplicablefornozzlesprotrudinginsidethevessel(Fig1),TangentialNozzle(Fig2),Nozzleatangle(Fig3).

(http://3.bp.blogspot.com/-1sgGGRbXku4/UfN9eXjWy_I/AAAAAAAAAHA/MBByAskXWXQ/s1600/Untitled.png)

5. Typically,WRC-107 is used for local stress calculations andWRC-297 isusedforflexibilitycalculations.LimitationsofWRC:Other than boundary conditions mentioned above there are few morelimitationsasmentionedbelow:1.Neitherbulletinconsidersshellreinforcementnordotheyaddressstressduetopressure.2.CAESAR II ,PVElite&CodeCalcwillnotextrapolatedata fromthechartswhen geometric limitationsmentioned above are exceeded. Extrapolateddatamaynotbeappropriate.

(http://www.bidvertiser.com/bdv/BidVertiser/bdv_xml_feed.dbm)InputsrequiredforperformingWRCchecking:The following documents must be ready with you before you start toperformWRC107/297checking:1.EquipmentDetails/GeneralArrangementDrawing2.Nozzledetails3.LinelistStepbyStepmethodsforperformingWRC107/WRC297calculationinCaesarII:

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Step1:PerformStaticanalysisofthestresssystemandfindoutthenozzleloadsrequiredforcheckinglocalstresses.Step2:Enter intotheWRCmodulefromCaesarII.Provideafilenameforyourjob

(http://2.bp.blogspot.com/-AN1nO4AM5tA/UfIbwPZsxGI/AAAAAAAAAFw/i5PgQHC3tfA/s1600/1.bmp)Step 3: Following screenwill appear. Enter theNozzledata asmentionedbelow:

(http://1.bp.blogspot.com/-e5g9YxguiB4/UfXteYKOCLI/AAAAAAAAAHg/JTYZJY7UWlw/s1600/untitled.bmp)

Step4:Nowenterthevesseldetailsi.e,diameter,wallthickness,corrosionallowanceandmaterial.



allowanceandmaterial.

(http://4.bp.blogspot.com/-LiewvySO_H4/UfXuhmC3ARI/AAAAAAAAAHw/he9qlLewsDA/s1600/untitled1.bmp)

Step5:InputvesselandNozzledirectioncosines,Internaldesignpressureand load and moments values from Caesar static analysis output(Sustained,Expansionandoccasionalasapplicable).



(http://2.bp.blogspot.com/-K-jEEu3IxsE/UfXw7dl8tWI/AAAAAAAAAII/SmGMy1AZ3vc/s1600/untitled2.bmp)

Step6:Onoptionsitissuggestednottochangeanyparameter.Nowclickon analysis to read the results. The outputwill inform youwhetherWRCcheckingispassingorfailing.Useresultsasperyourrequirement.

(http://4.bp.blogspot.com/-Eh0nGNb4LZY/UfXxyDSRhFI/AAAAAAAAAIU/LcG95nFcXV4/s1600/untitled3.bmp)

For entering loads and moments as per local convention followingdescription and figure canbeused for convertingglobal forces into localforces:



CaesarII(http://www.whatispiping.com/category/caesar-ii)

code(http://www.whatispiping.com/category/code)

EngineeringTools

(http://2.bp.blogspot.com/-PjzH_dYX6j0/UfN_n7Qz1JI/AAAAAAAAAHQ/6LMunHIxlmg/s1600/Untitled.png)

Asshowninfig,StretchyourrighthandwithMiddlefingeralongtheVesselCenterline. Index Finger should parallel to nozzle centerline and shouldpointinadirectionfromnozzletowardsenteringvessel.AndThumbshouldbeperpendiculartoboth.Then1.DirectionofIndexFingerrepresents+P.2.DirectionofMiddleFingerrepresents+VL3.DirectionofThumbrepresents+VC4.MLwillbepositiveifbyapplyingrighthandthumbruletoML,directionofthumbissameasthatofVC.5.MCwillbepositiveifbyapplyingrighthandthumbruletoMC,directionofthumbisoppositetodirectionofVL.6.MTwillbepositiveifbyapplyingrighthandthumbruletoMT,directionofthumb is opposite to direction of P.Get the loads and moments fromCAESARoutput.Compare thedirectionofForcesandMoments inCAESARoutput with conventional Force and Moment directions and enter thevaluesofP,VL,VC,MT,MCandMLaccordingly.

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Step by Step Methods for WRC 107 and WRC 297 Checking in Caesar II

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