How to Calculate Surge Forces on Piping Systems_ - Intergraph CADWorx & Analysis

6/10/2015 Howtocalculatesurgeforcesonpipingsystems?IntergraphCADWorx&Analysis

http://65.57.255.42/ubbthreads/ubbthreads.php?ubb=showflat&Number=37418 1/4

Youarenotloggedin.[LogIn]HomePageForumsAnalysisSolutionsCAESARIIHowtocalculatesurgeforcesonpipingsystems?

#3741808/13/1009:20PM

#3743908/15/1011:50PM

RegisterUserForumListCalendarActiveTopics FAQ

TopicOptions

Howtocalculatesurgeforcesonpipingsystems?Kuramadenz

Member

Registered:08/13/10Posts:2Loc:Philippines

Higuys!

Ineedsomehelphere.

Iamanalyzinga40"LNGline,withasurgepressureof9.14bargandavolumetricflowrateof14,000m^3/hr.Ineedtosolvefortheforcedevelopbythissurgepressureonmypipingsystem,sothatIcananticipatepreciselytheloadsactingonmydirectionalanchorsandguides.Ijustdon'tknowtherightformulaforit,orhowtocalculateitprecisely.Anyonehaveanyideasonhowtocalculatesurgeforces?Pleasehelpmeoutherefolks..Ijustneeditbadly..

Thankyouverymuch!

_________________________Kuramadenz

Top

Re:Howtocalculatesurgeforcesonpipingsystems?[Re:Kuramadenz]the_dude

Member

Registered:01/20/05Posts:76Loc:Singapore

Calculatingsurgeloadsisnotastraightforwardexerciseunfortunately.MosttimesIhaveexperiencedthistheapproachhasbeenvery,veryconservative.ie:PxAxDLF,whichisbasicallyassuminganinstantvalveclosureandassumingthesamepressurerisefortheentirepipingsystemregardlessofthelengthorconfiguration.

Itisworthspeakingtoanexperiencedprocessengineerwhohaspracticalpipingandsiteknowledge.Youneedtoknowthesurgerise,thevalveclosuretime,thevalvetype(todetermineeffectiveclosuretime),acousticvelocityandsomeotherthings.Aprocessengineercantellyouallthosethings,andtheyshouldbeabletohelpworkoutrealisticloadsdevelopedfromelbowtoelbow.

Ifyouworkwithanysubseaorpipelinesengineerstheyshouldalsobeabletohelpyou,astheywoulddealwithsubstantialsurgeloadsduetolongstraightlengthsofpipe.

Who'sOnline1registered(Nagarjun),18Guestsand3Spidersonline.Key:Admin,GlobalMod,Mod

JuneSu M Tu W Th F Sa

1 2 3 4 5 67 8 9 10 11 12 1314 15 16 17 18 19 2021 22 23 24 25 26 2728 29 30

ForumStats10651Members13Forums13591Topics61076Posts

MaxOnline:57@12/06/0911:14AM



#3757208/20/1006:06AM

#3758608/21/1002:58AM

#3759708/22/1011:01PM

Editedbythe_dude(08/15/1011:52PM)

_________________________nosignature

Top

Re:Howtocalculatesurgeforcesonpipingsystems?[Re:the_dude]faiz_mas

Member

Registered:06/03/10Posts:12Loc:TamilNadu

HelloKuramadenz,Pleaseconfirmwhetherthepressureyouhavestatedisthesurgepressureorthelinepressure.UsuallyforamainLNGlinesasurgeanalysiswillbestudiedduringshutdownoperationinaspecialisedsoftware(eg,Pipenet).Thiswillgivetheriseinpressureinthelineduringshutdownoperations.Sincethevalvesarenotstopedasuddenthesurgepressurewillnotbethathigh.Sincethelinesizesareveryhighinyourcaseitwillbetooconservativetoconsidertheabsolutepressuredifferenceasthesurgepressure.

Top

Re:Howtocalculatesurgeforcesonpipingsystems?[Re:faiz_mas]Farhad Member

Registered:04/25/07Posts:116Loc:UAE

HelloThere,

Forvalveclosureandsurgeanalysis,PIPENETTransientmodulegeneratesForceFile(FRCfile)containinguniaxialappliedforcesonpipingsystems.CAESARIIcanimportFRCfilesandgeneratesDynamicinput(WaterHammer)automatically.YoumaydothesameanalysisbyusingBOSFluidsandCAESARII.Forwaterhammercalculation,refertoCAESARIIapplicationguide.

_________________________Regards,FarhadSalehiWhatUgiveUgetback!!!

Top

Re:Howtocalculatesurgeforcesonpipingsystems?[Re:faiz_mas]Kuramadenz

Member

Registered:08/13/10Posts:2

HelloFaiMaz,

Thesurgepressureisreallythat9.14barg.ActuallyIhavealreadythesurgeanalysisreportfromtheprocessgroup.Theyhave7casesofESDofcontrolvalves.I



#3760108/23/1012:16AM

#5619109/15/1306:14AM

#5620709/17/1302:07AM

Loc:Philippines chosethecasethatwouldgivemeaconservativeresult,andthatcaseregisteredapeaksurgepressureof9.14barg.

Statically,theforcethatwouldbeexpectedateachnodes,isaround600knformycase,assumingofcoursethatthepressurerisetimeiszero.Buttheprocesshadgivenmearisetimeof15secondsafterESD.SoIrunadynamicanalysis,andgetalowloadsonmysupports.I'mjustnotsureifthisisarightprocedure.

_________________________Kuramadenz

Top

Re:Howtocalculatesurgeforcesonpipingsystems?[Re:Kuramadenz]K.MKIM

Member

Registered:11/14/07Posts:6Loc:KOREA

Hello

IfyouhavethesurgeanalysisreportfromprocessgroupwhichcontainsthetimePressuredataateachnodes.FirstchangethepressureintorisedpressurebyusingP=P0+DeltaP(Risedpressure)andthenchangetherisedpressureintoforcebyusingF=PxA.Finally,runTimehistoryanalysisinCaesarIIwithTimeforcedataateachnodes.Thisismyjustidea

Doesanybodyhaveanyideaaboutabove?

Top

Re:Howtocalculatesurgeforcesonpipingsystems?[Re:Kuramadenz]DuWei Member

Registered:08/22/05Posts:15Loc:Shanghai,P.R.China

IfapplyingthecalcualtedsurgeforcesinCEASARIIby"staticequivalent",itmightrequiretomultiplytheloadsbyDLFfactor=2?

Top

Re:Howtocalculatesurgeforcesonpipingsystems?[Re:Kuramadenz]Farhad Member

Registered:04/25/07Posts:116Loc:UAE

DuWei,

DLFforaninstantaneouslyappliedconstantload(notaharmonicorimpactload)isalwaysexactly2.

_________________________Regards,FarhadSalehiWhatUgiveUgetback!!!



Hopto: CAESARII Go

Top

PreviousTopic Index NextTopic

Moderator:DaveDiehl,RichardAy

PrivacystatementBoardRulesMarkallreadGooG_v2_copy_copy_copy ContactUsHomePageTop

Generatedin0.042secondsinwhich0.009secondswerespentonatotalof15queries.Zlibcompressiondisabled.PoweredbyUBB.threadsPHPForumSoftware7.5.7

How to Calculate Surge Forces on Piping Systems_ - Intergraph CADWorx & Analysis

Documents

Transcript of How to Calculate Surge Forces on Piping Systems_ - Intergraph CADWorx & Analysis