HTRI常见技术问题汇总Word文档格式.docx
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HTRI常见技术问题汇总Word文档格式.docx
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2)Canatestringbemanufacturedfora"
typedesignwitharemovablecover
2)Yes,plugsareprovidedfortheboltholesinthefloatingtubesheet.SeeParagraphE-4.13(3)
N2(234)
Isitacceptabletouse"
lapjoint"
typeflangesforexchangerbodyflanges(partsnos.3,10,11,13,17inTEMAfigureN-2)?
Yes,providedtheprovisionsoftheASMECodearemaintained.
(292)XX
ReferringtoFigureG-5.2(M),"
HEATEXCHANGERSPECIFICATIONSHEET"
Line42,shouldn'
tthenotation"
(Integ.)(Remov)"
properlybeonLine43?
.
No.Thespecificationsheetiscorrectaswritten.Foranexampleofanintegralshellcover,pleaserefertoFigureN-2fortype"
CFU"
itemdenoted"
9"
.Foranexampleofaremovableshellcover,pleaserefertoFigureN-2fortype"
AES"
WELDINGoffixedtubesheettypeheatexchanger(321)
Onaonepassstraighttubebundle,withtwofixedtubesheets,BEMtype,areweallowedtoweldtubesheetstobothshellandchannels/bonnets?
AndistheunitthenstillcalledBEMtype?
Yes,itisacceptabletoweldtubesheetstobothshellandchannels.Theunittypedesignationisstill"
BEM"
.However,wesuggesttheunittobereferredtoas"
BEM(allwelded)"
or"
BEM(special)"
Section2
(116)
DoesTEMAsetanytoleranceregardingmaximumrotationofthefloatingtubesheetwithregardtothestationarytubesheet?
No
F-3
(219)
1.)DoesFig.F-3refertosurfaceflatness?
1.)No.ThetolerancesinSectionF-3arefordiametersandthicknessrelevanttotubesheets,partitions,coversandflangesandarenotpertinenttogasketsurfaceflatness.
2.)WheredoesTEMAspecifytubesheetflatnessespeciallyforpasspartitions?
2.)RefertoPara.RCB-6.33andRCB-6.4.
Section2F3(229)
IsitpermissibletouseflangetypesotherthanshowninFigureF-3,Section2providedtheymeetASMECoderules?
Yes
StackedUnit(313)
DoesTEMAhaveamethodfordeterminingstresses/thicknessesinshellsofheatexchangersthatarestackeduptothree(3)high?
TEMAdoesnotcurrentlyproviderulesforthedesignofsupportsforstackedexchangers.WithreferencetoG-7.11,supportdesignforthebottomunitshouldtakeintoaccounttheweightofthetopunit(s)topreventoverstressintheshellorsupports.Inaddition,bundlepullingforceofthetopunit(s)forremovablebundlesshouldbeconsideredindesignofsupportsforthebottomexchangerofstackedunits.Calculationmethodsaretheresponsibilityofthedesigner.
RCB-1(227)
AreSA-249tubesacceptableforaTEMAClass"
C"
exchanger?
Yes,materialsshouldmeettherequirementsoftheASMEBoilerandPressureVesselCodeSectionVIII,Div1.
RCB1.13,7.132,7.22&
7.23,ASMESEC.VIIIDiv.2,ASMESEC.IIPart-DTable2A&
2B(282)
IsitacceptabletoapplyASMESectionIIPart-DstressintensityvaluestoanexchangertobedesignedperASMEVIIIDiv.2?
ThestandardsareintendedtoapplyonlytoexchangersdesignedtoASMEVIIIDiv.1.WerefertheusertotheNotestoUsersoftheTEMAStandards,onpageviiiofthestandardforguidance.
RCB-1.13(286)
MayexchangersorpartsofexchangersbedesignedtovesselcodesotherthanASMESectionVIII,Div.I?
IntheNotestoUsersoftheTEMAStandards"
(pageviiioftheStandards),exceptionstotheStandardsareallowedaslongasthereisagreementtotheexceptionbytheuserandtheexceptionisdocumented.
SECTION5ANDRCB2.2TUBEDIAMETERANDGAUGES
RCB–2.21BARETUBES
TABLERCB-2.21LISTSCOMMONTUBEDIAMETERSANDGAUGESFORBARETUBEOFCOPPER,STEELANDALLOY.OTHERDIAMETERSANDGAUGESAREACCEPTABLE(320)
regardingTableRCB-2.21forbaretubes,whichofthefollowinginterpretationsiscorrect?
INTERPRETATION1:
FORTHEDIAMTERSLISTEDINTABLERCB2.21THEGAUGESMENTIONESAREONLYINFORMATIVEANDTHETHICKNESSOFTHETUBEORSELECTIONOFGAUGECANBEBASEDONASMESECTION8DIV.IPRESSURECALCULATIONS.INOTHERWORDSOTHERGAUGES(HIGHERORLOWER)CANBEUSEDFORDIAMETERSLISTED.INTHETABLE
INTERPRETATION2:
FORDIAMETERSLISTEDINTABLERCB2.21THEGAUGESMENTIONEDAREMAXIMUMRECOMMENDED(THICKNESSMINIMUM)ANDTHEFREEDOMTOSELECTHIGHERGAUGESISAVAILABLEONLYFOROTHERDIAMETERSI.E.DIAMETERSWHICHARENOTLISTEDINRCB2.21
Interpretation1iscorrect
RCB-2.21(228)
MayatubewithwallthicknessthinnerthanthatlistedunderParagraphRCB-2.21beusedprovideditmeetstherequirementsoftheASMEcode?
Yes.
RCB-2.31U-bendrequirement
(108)
Shouldtheminimumtubewallthickness(t1),bebasedonthethelargestthicknesscalculatedforinternalorexternalpressure?
RCB-2.31(311)
1)Withreferencetothe10%flatnesstoleranceforU-bends,whatistheintentofthecomment"
U-bendsformedfromtubematerialshavinglowductility…."
?
1)TheintentofthiscommentistoalerttheuserthatU-tubesformedfrommaterialsoflowductilitymayrequirespecialbendingtechniquesinordertomeettheflatnesstolerances.Formoreinformation,youmaywishtoconsulttubesuppliers,particularlythosewhofurnishU-tubestothepowerindustry.
2)Doesa0.75"
ODU-tubewithameasureddiameterof0.665"
atthebendmeetTEMA"
R"
requirements?
2)No
RCB-3.13
(118)
InthetablesR-3.13andCB3.13whatisthecorrectthicknessforintermediatevaluessuchas750mm(29.5inch)nominaldiameter?
SeeTEMAParagraphN-1.11fordeterminingthenominalshelldiameter.Inthecaseofshellinsidediameterswithfractionsof12.7mm(.5inch)andlessitisacceptabletorounddowntothenearestinteger.
RCB-3.13(326)
MinimumthicknessrequirementfroCarbonSteelfrom30-100Inch-12.7mmwhichisverystringent.SometimeactualthicknessasperSectionVIIIdiv1,is8mmforgivenrangeofdiabutwehavetotake14mmplateas12.7mmisnotavailableand12mmisnotacceptable.CanweuselessthicknessifagreedbyourcustomerasperASMEsectionVIII.
AsstatedonpageviiioftheStandards,"
NotestoUsersoftheTEMAStandards"
exceptionstotheStandardsarealloweduponagreementbetweenthepurchaserandfabricatorandsuchexceptionsaredocumented
TableCB-3.13
(130)
1)Whydo20"
and22"
shellsrequiredschedule20pipe(.375"
wall)butplatecanbe.3125"
thick?
1)PipeSchedulesfor20"
shellsarebasedonpipescheduledimensionsshowninTableD-1.
2)Canpipewith.3125"
wallthicknessbeused?
2)No,unlessagreeduponbetweentheManufacturerandPurchaser.
RCB-3.2(327)
InparagraphRCB-3.2minimumshellcoverthicknessisaccordingtotable3.13,butitis"
beforeforming"
.Weknowthatthicknessofknuckleportionafterformingisverydependofformingtechnique.Howeverfordesign,afterformingthicknessisimportantandthebeforeformingthicknessisbasedonexperienceofeachmanufacturer.Pleaseclarifywhichoneiscorrect?
ThenominalthicknessofheadsbeforeformingmustbeatleastequaltothevaluesshowninTableR-3.13andTableCB-3.13.Thethicknessoftheseheadsafterformingmust,asaminimum,meetthethicknessasrequiredbytheASMECode,SectionVIII,Div.1.
RCB-4
(199)
Whatismeantby"
intermediatesupportbaffles"
Theterm"
referstotubesupportsinthebundlewhichdonotaffecttheflowofthefluid.Theyareinstalledbetweenbaffleswhichdirecttheshellsideflow.TheyaremostoftenusedinNTIWbundlesinwhichcasetheyhavewindowsonbothsidesandareusedtoreducetheunsuppportedspanofthetube.
(287)
Inlieuofplatetypesegmentalormulti-segmentaltypebaffles,itacceptabletoprovidetubespacing/supportusingalattice-workcablestensionedbyaframework?
Althoughthismethodoftubespacing/supportisnotdirectlyaddressedinTEMA,"
othertypes"
ofbafflestructuresareallowed;
however,designguidelinesareforothertypesarenotgiveninTEMAandsoundengineeringjudgmentshouldbeexercised.
RCB-4
(302)
1)Isitmandatorytohavehorizontalbafflecutwhennozzlesarebottominletandtopoutletontheshellside?
1)No
2)Isbottominlet/topoutletgenerallyusedorpermittedwithverticalbafflecuts?
2)Itispermissibletohaveverticalbafflecutswithbottominlet/topoutlet.SpecificquestioningregardingrecommendationsofbaffleorientationarenotwithinthescopeofTEMAandarelefttothedesignertoexercisesoundengineeringjudgment.
3)DoeshavingaverticalcutinthebaffleinU-tubebundlehelpinreducingvibration?
3)Bafflecutandthecorrespondingtubelayoutangleareoneofmanyvariableseffectingvibration.TEMAcannotaddressspecificdesignquestionsormakerecommendationsconcerningspecificdesigns.
RCB-4.2
(142)
IsunsupportedtubelengthinParagraphRCB-4.2basedonthesamedefinedunsupportedtubelengthinTablesR-4.41andCB-4.41?
RCB4.4(238)
ForTEMA'
F"
typeshellandforthepurposeofdeterminingbaffleorsupportplatethickness,shouldthe'
nominalshellID'
inTableR-4.41betakenasthefullnominalshellID,or1/2thefullnominalshellID,orthehydraulicdiameterduetopresenceofthelongitudinalbaffle?
Thefullnominalshelldiameter(seeTEMAparagraphN-1.11)shallbeused
RCB4.6
(203)
1.RCB4.63seemstorequireanimpingementplatefortubesideliquidasafunctionofpv^2.Whataboutotherfluids?
1.RCB-4.63doesnotreq
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