pdg-01-psv sizing for tube rupture

8/8/2019 PDG-01-PSV sizing for Tube rupture

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DOCUMENT NO. 4-0241..4;19-SAFETY -RELIEF REQUIREMENT INCASE OFEXCJlANGERTWE: FAILURE

DESCRf l>TION1.0 ptJRpOSt

Thepurpose of'thisprocedure is- - .-. - -

- 1) to Ia y do~ the -c rl te tia ,t ~- as ce rta futh~ pOSSl,,_ilityQfex;chang~rtubefailure.-2} -to decide-when to install a reliefdevice,

- - . _. -_3) howto specitYthe teliefIoadandoth~ C ( I D _ d i ! i O t l s i n t he .exchanger a n d P R Vdata sheet.

4)-how to showthePkv with necessary features ,mP8tIJl

This ,procedure shaRapplybYall_theengjneers,TspQilSl'ble tot carrying Out processd e s i g n fora u n i t J o 'j t . ' ; i! e $ , a n d _ l m . 1 i t ie s - s y s : t e m . . _ p a r t ic W a i 1 y : i n v o l V e d : in - t h e preparationoftheprecessdatasheet 'of;SheU'$d' -tubebeatexc~g~ d_ev:elbpiIigthe P&l, -relief'Ioad andsafetydevices.datasheets, . - - -

-3.0 REFERENCES- __5-,0241..0111EJL.;0241 ...7451--1-API RP 521 -- -4 10M. 19E I L . J O O O C _ . . .xxx-x

_ProCedure for Preparation OfPTO~ssDe-sign Guidel ines . :~o.ce$S-Data~eet tor~eatEx~gers - __ _ . .-.:~SlZlJlg... selection and IilSt~fion of P ressure R elieV Ing _. ,Devi~-s-in,}l:efln_eries- -Crane 'FIi ;JWof 'F luids , _T~carPub1ications -Process Data sheet for S af ety V alv e ---

Sht. 20 'itt: -

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- :.im . .: s irs Ot:"lgl1 pr.: _.....u re- \\ hich js lh~ t~~l prf~-"l J: r e _ thiS I"ensured when this 1 ' 1 : ' " p.rcS$t! .H:eq_llals the Hf' ....idc designpressur.

5-:2.2 The t'lIh~ rupture srenario and the al"ow -crileria ~Hto for the$1;1( '11;fnll tuh(. ' t:\:ehang\'lSi)nly. The tuh\' I-HpLttrC \,1..lI'!:Hio isnotapplicable Jnroll~l;:'r type of {,x('h;l!ngt:rsJ~nllnwi-J:lg is~t{}heconsidered fur lihL' double Wipe nchan~crs_

5.2.3 In case of a dill1hlc,:pirel'xch:lngcr.;~'PpJy .the ill~n\.:{::criteria first In exph1f~\\:l~el!hnl'hct,ubc rupture is likely ;Ilid.then mention as ~lriQtt,!- in the. p-ro\.-~$S datal - sheet 'No.EIL-02-J1-7J5-J ~ that " Tube rupture to be cOH~jJ,"rt'tr if a'gauge -tuhe is .uscd in the criRS-lfllct;Jrln,. -Thermal des-igner torevert back."_Tuhe Tuprure -scenario IS nor-to be considcrediincase of - adouble pipe- exchanger constructed \\ ith "schedule" pipes- --which-is .usmilly th e case. the schedulepipeis like any _ otherpiping in the $y:-tcmand~ltnng~J than thenormal '_'-g,lllgej,IJpe --tube used in th e ~ht"l1ahcll:lih~ exchancers. -- - - -

-5-3 - GUIDEiJ\ES 0:\- ~ \ V - H l E - - n U 2 R TO -GOF'OR -A RELIFF-VALVE OR lSCREASE_THELPSliDE DESIGNPRFSSL''RE.- . . . - - - . . -5.3.1 For the Sjllfat,jt1n a s ruentiuned in caseb) . in-lihepara 5.2.1, -

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;::,.-set prC!s.sure"isprac!.isltdin other cases of the safety relief) . At .the same lime. itts (iil!mlst impossih1e topnovide any suitablearrangernentwhich can avoid any liquid accumulation in theoutletlineleadlngto the. flanebeader .Matter ,is s imple 'if therelief discharge can becrmnectedtoanother low pressure sink with free draining the ou tlet line. Asa lirst Chtlice, always explore .thls -possibility_. Ot'herwiset,hereexits:two tlptlnns when the exchanger is below theflare header--eleva tion:a) Increase th~ exchanger elevation ( which will.implyabove lilkflare header) so .that the PRVdrainine to the flarebenden, - . - ----. . . . . . - - .

au~oinaticallyoutlet is free

bJConnect .l'he 'relief discharge li~)it local knock Out drum (which,w i l l - floatwith the Ilareheuder land the liquidflutnping{lillt/'dis:posal system. This a 1 5 C ; ] - mayrequirea slightly elevated'exchanuer -in order to .makethe PRY outlet free xlraininz. ~ . . . . ... -tow ard s the: v essel,The decision on th~'::I(klpliGnofa particular optlon , sizing ofvessel liquid drainageJpurnpingetc. are project specific andto be carefully mnaH~~d bythe concerned process engineerqs),This is not addressed further in this 'procedure.

5.3.2Fot- the cother' 'situation as meiltihnedin_'ease. b)!o para 5.2.1.use th~ decision chartattached fernscertajning whether toinstall .fhePRVor not, Nflte that eIhphaslshm..'ebee n .ghe_n .toavoid putting a : p , R Vby increasing the LP'sided~sign'piess1,ir~..If th e tPfluid i .s , in the channel side .itis a lway s p ro po se d-to..do soas the ( 'o! ' tpe,naltyis not rnuchH the LPfluid is In theshetlside. then' del;jendirty.upon:theexchangerl"lcat,ion. size.'MOC.PRV to he installed if it is. Ielr: that itisa costlier.proposhien to increasethe LP side designpressure.

i


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- o _ Y e $~

-

Ref: S .J .2 Pc..~_ : D ecision chart-for ascer ta in ing whe ther a PRV to beinstalledYes No

I$-thetxhcloc8,t:ed below''''''_-..,..-~fla-re'headereleva,tion

1$ the Lpfluid:in--sh~ll $ide.?

Cantne relief _ _discha.rgeb~c0nnec-ted. -to a lo.w pre$_sue --de$tinat~il~fn with~-fFe~-drC\-ioning prov:isiQn -or-to __P:t,maspne,re

--Yes-_ _ c - _ - _ - - .

----Is the relief -d1t_seha,tgef-'ully va'p_ouro.r vaplll(j,Yes -n\.fx:tut:e @~lQ_rel'H!::ade-r ---.-'--,--:condi:~tion (a,t ze'robac)~-press in; -fla:,reheader

-,"-r".

NO -

Examinewhel:her the __relie:f 41seha-tge _-cati ,be $oI'Ule-eted to' ,Nofla.:re -:p.-epending: .on - ---the--:hature'O'fthefluid:. -- ':" - . - ..

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...e _- ___jJ- : y e s -Ca'nthe liquid --dl$cha;l';g"'- '_~o-be cGFlnected -toclGsed - l'----'--~-----l-blowGown,

.cs She-lI - costl:y,-Ar~a. _ ->$00 m~ - MOCpress. ratio < 1 1 . .~ ~ _ - _ Pl1'ess ra:t.to


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.;~7-=-_.--'-)- i J - - : - - -

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Note J: T hese are fheoroad-guidc-!ines based onthe survey Gonefor big projec-ts. For agiven pl'oje-cl,: always, consultwith - H 'M T - Dfo r the COS I_ factor _hetol' -deC id img not go tiara relief valve . Atsoclientand licensor is to be jnformed, if necessary, on case to casebasis .NO le -2: pressure ra_ tio- -:-Requireddesign pL for the ~.t.P_side tos a t i s _ : f y t m e _ two-shirdcriteria -cli~,idedby-r m designpr. of-tfue LP

_- s id e -from norm al pro-cess consideration.

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-~Jnst: l ll~ninn of iT PH ,V does not.ruean t)1;11 the - H I P fluid ingre-ss' c a n - b e p r e v e r u e d i n the LP side c J (W . 1 r 1 S 1 f c < l 1 1 1lupsl,ream d u r i n g - atuberupture, The pllfJmsetjf llhe nelief deviceis -10prevent onlylhee-xt.h


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_5.4 .2 - W hen it , is dCf . :idctf - tn- ins ta ll a ,saf t; ty rci ic .fva lvc .a} ._T ht,. P R V for tiUtilt: ruptureis 10 h~d.ecl_icaled andloca red enthe eXi;-hal1gr:-r --in ~LHtSlion . No other PRY Jorated-clQwns-tl"e-;Jm:l'p!


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5.5 _CALcuLAtION OF -THE ItlE:t.;N,SVING LOAD ANDSNECIF '_ lNG OTH'ER 'CONDITlo.NSIN--THI: -,PRY DA TASHEET NO . E ; l L x x ' x , x : ~ ) ; , x " x .- - . . . . . . . .

5.$. '1011l'1:ili~dc(idedtH :install fi 'PRV , H 1 C ;fullowing Iormulue to he:used,t{'lCilkulal~the(,Jow HlfiAUghthe nll~tutt(!lof'H!ning. Sim"cthe trcarmentis fonthestendy.srate .rhe weight How in :kglht so.calculated through the - ruptured'opening willbe jhrough-thePRV-_aJso._the LP 's icJ t:ml l1mal iy have . somecapacity t O O absorb the flew,-Slnce it i~cliffkll1t-10 C!s tnMishthi s - ,conX ' inc ing ly ,no9 '- e< :Ht is t0bit taken _Each of t~e :thn6\\cing 'case's ,cH ntai n thegu ideU n e Oil - what a ne thow to spl!tify the Joad andorher conditions-in tbePRV dar'asheet.TWH conditions are to he. specified in the data sheet .. one for_the HP' sidefluid retieved t:hrolJj!h the :PRVand the ol,her__.. - - - - - - . ._ , .. - "_ - _L P sid~ - nuldjl~eI(. Tht!PRV robe sized f0rbQl'h andp f i { O ) \ l d l t t l f


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w --- -J;low ,r-ate.kg.lhr.d _;... - ,lD~_of - { , h e tuhe:mm.AP -,. :O esignflfT e~slIre of -the- H IP side.kglctn-2a,;..;oJ.1limes thedesign _flr~ssul'ie,kg!tm2a-nfl'heLP sicle{ bt.tihe reliev ingpressure].P ..,- Density of theliquid; - - k g . . l m 3 a t - th eoflttrtlt,ing temperatuneof tht! up- side. UsedesigntemperatureIf coincident w jrh -.dcsi;n pressure.

60

, . .'theH0\vS('1 calculatedis the liP-side li~uicl -t:lowing. thflolJg.hlht! np_cmiI lg.-F"ol lhW ingtobe -adopted. forthe 'PRv data sheet:

- -Case J: Sp~_cify:the H P side -Jiqpid as the re :J ie vlng f lu id .

i) theflow as C;:iJcuhlted ~IS aboveii) -the irated capadty _ 0 f .the pumpzcernpressor upstream-orestablished -hy rnateninltsalance orrnaximurnperrnitted -b y the ,-control \'ah'eup/do\Vn~lfeam ~ -

: -. -

01Setpressure: Ijp side design.pressure.orIesser (de:pending .onbther -prQcessreasons_ inlheL J> s1d~} ~Kg!ttn2g. - :-( : 1 'O v e rp re ssu re : -1'0% -d f the set p r e s sure ,

--d) Relieving'tempera ture ~O.pe.rating- tempe ratoreefthe HP- 's ide l iq i ri cl . Sp_et'ifyt-he ~des ig f1 --temperatuteif - i t iscoitrcidefilwith-the design .p - ressure, _ -- . i' "', '0'"

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. . . . .f .:- .... _


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e) Properties :H P _side-li{;luid'prl,'pert'ies at th e relie . .. ..,ing- { ; . ' 6 n d h l i ( 1 J f U L i ~ I l ! i d : JH'opC!,f{l ies will - n t ' l t - u i l _ d e t g o anychnnge a t theTCt:lie-vingpfte-ssure. --

- - -Case 2: sfJt~ciryas an alternatecase theL~ side :fluid.oJ Load; Specify th~LP sid_eflu_id B mw late same as theV 0 h l 1 T i e : t r - i c equlvalent .as. t-heloa-dd~terminedii1the tas~l-aQ~ lVer t1 rHi' Iiquid~Obtainthte kg/rui tJa4 by rfiulr:i~tyjng\V;lth,propel d~:nshyat -t,hf! f t-1I1ov.i ing-(, 'ondhien. This n l F y - _ b - e seenmomentarily - b y - PRY :nefote r i ! _ l e a s i n _ g the ~ctual-HP-liqli jt ;i ._hlS~tpliess\1r~:LP 5 ided ltxign f lr ess} . ir .~ orlesse r (de:pe :nd ii tg on . ~ t _ : ,-etherptocess-rei150ns , i n "t,he t:p si_ lk).kg!cm2g~_- - ~- c} 'O v erpF essu-te:- _ Hi)% of the set pressure, - {d'}-R.~Iit!l~ing leltlpeNnut~: Temperature 0f thelP .slde Iluidarth e relievingpfilt5S(lttt. .This -mayht : satnratkan -eroperating_temperature de , pdmUng upon -ihcase. . " :

- .

i_-_elPtl1pettis_LP side :Jiquidpf@perties&t the : r e h e V i n g-~0ndition,\ 5,5.3 liP s i d e - - i s _gas/v;lpour .and flowthtough rupture .witheut phasechange . .

Forcompressible. fluid-;flow IhFG_ugb~tjfke-openjng; there exits"a -fundatnenlal -thetmodvnamicconsidenation. -this ,is - foragi\:eii-~pst-~e:tmpressure. ._- I , h e thf~~1t "pf~S~~Jieca h n d t ; -JaUb~low --ac(frtain,nhJe -- no maner.to lihe whal_leveFt,hcdownstteamptessut~j5- dropped. -rhis limiting t h ( 0 a t :p~ess'~F~:-~is-canedlhe

- ' --cr il iCa l f lo \\ - pressure -PQF . 1cleatI}~~- r~r -a -g ]\"f .i l upstreampressure . -this value is ro _ be -c altu ta te q'ftom -t h : e - sonic flowequations usJng lhe-- - cp/ev .N()rmaUY. this value comes out tohe -50.;55%of lhc_ upsmeampress . Itispropesed te use a

t;o f;- - . ~ --" p I :~.

- "'


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value of . 5 5 1 1 t -of - the-upst'Jieampft"ssllTc fot thecalculations_here.lf lhis value.comesout - to-he_mtire--- l,ha_" th~ .downstrearn~ L P _side - r e l k v i t l g r)Ji~SSufe-.' PCF 'ifsdf tobeusedindeltaP ftJrthe flow calculation, : r : o J 1 o w i l l _ g Iorrnulae lobe used: -

W ,.-Fkiw rate ~kg/hr.d _---liD- '0ft-he tube, nun,_ v ~ - Specific volume, m3/kg ,(g -designpressure & operatingIctilpetat 'nte--0fl,herU~. sid~.Usedesigntempera 1U~ejrtQlncide;R t wi {ill-lksign pressure. -y --- -U)~- ~).3HAPtP.rEx'Pansjnn; factor.This is to 'he :~1ke'hInto.aecount forchanze in volumeof- - - - - - - - - -~- - -- -COm pT t~ ss ih )e f:lu ld t'h riOug J1 - th e0 fjf Jc e~ .. -; . -. -PI -~ Design pressure of the lilI' side~l


14/25

_ I n : - ~ - ' - s ltuation _in\ 't ,~ lvJng .excbanger :in-ihe -p a r a lJelcifcuit,-- --m axim um - flow possib le can 'henscenalnedand - specifled. A '

- .g-[;lodD ppt(~nchisti' l lake sonic flow in the Inlet piping of the: N ' P side. 'If this valuecannotbe determlnedwith conldeJice 1specify- the v alue .ns -d'eterm_ineaby th e abevecritena.-: - h )S if tp re "- ss lif e: -l . ..P-5id e .d eslg np ressu re -n rles-ser (dependingon

-other .-pnlCessFt'-.iSt,lJiS, in the l..P 'side) , -kg!( :J 1']Zg~. clO w .rpressl.iJ ie: I0 9 : _offhe:;et:pfessUIiC-.d) Re-liev in g .tem p en ature: _O petD lin gtemp eJ imU fe oj. the -HP--sidegas, $ptteify the de.signteJl1pe,rah.ire jif it is .coincident with--thedesignpressure. -',

-_e-)P :r@ ~11itfS _-: HP .side ,gaspropeities at - t,hereUeving-c0ni lkms. Notethat ifthe"~:lie\'ing,pi'essllJie-is lower than tiht;-, peF tlnd tbe - proflettl:s -tlfetobe reestablished fOF this -

-cHn(1itinn~.f) -- Ca lc ula te 1h~\'fi1tll11elric -now ,,1 ft h eHP nuii;J a tthe--teJie\~ingcondition.Case 2: Sped!)' as an alternate case the -lP side fluid.

,a} LO


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- e) ,PtHp(rtie-! ' lP - sjtJ~ Uuid -pnlpetl,jesat the relievingconditlons.

5.5:4 IIP~hlcis _ J i q l i i r l a n d ' -n(~wthr:


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W ( VlIWlL) .;:~ . '01


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:r) 'CH_ICl.h~letht!vnh'flleHliCn(,)W vupolIr+tfquidof the liPf luid_ at the Jie , t i e _ v _ i r i g c ( , u l t : 1 i t k m . -Case 2~ Spedfyas nnnhernate case the LP sjdcf:hJi~~-a} Lead: Spltcity f.he_LP~idefluid ,flow n1tesam e: -as thev@l\1I11elriceq,uivnhml@f the HPfluio';( as determined' at thereliving condhi()o ). Obtain the -kglhrload: Iuttl1cr:, _""lp@ri~ ~_:a:ftc;r.-!lowingthrough Jhrupt:i,lte~_ - , - -. - . .

t h e appnoach : i o r this .case remains theeame'.asehe earliercase, ~ BUI v apour t< )1iq uicl'falI"O .at the thtoat pressure -lobe- - - t _ # d and: to beeslCihlisht: :d frfli11unis_nt'llaip,ic .,-flashtunbycom puter. _j_ _ If} rst. carry e n O l an -iseinh


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6.0 DOCIJM:.ENtATIONAnnexu re - 11\nneXUIe--2 -Atinexu:re-3-Al:r i:texute-4

List ofarticleszpublicationsreferredTyPical :f~&IDT~tesentation-S -nle -Calculation'-- a m p - - - - - - - -S ample 'PRVdata sheet

Page 1Pagel-pages5Pagel

- .P age l'9 'of 19

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