Cr Cor Eng Prc 105 e Surge Analysis

Doc. n. CR-COR-ENG_PRC-105-E CORPORATE CRITERIA Rev. 01

Date 15/11/13

HYDRAULIC TRANSIENTS FOR LIQUIDS Pag. 1 di 39

CORPORATE CRITERIA

HYDRAULIC TRANSIENTS FOR LIQUIDS

CR-COR-ENG_PRC-105-E

28/10/13

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INDE+ 1

SCOPE AND PURPOSE

,

REFERENCE DO DOCUENTS

,.1 ,., / /.1 /., /./  .1 .1.1 .1., .1., .1. .1./ / .1. ., .,. .,.1 1 .,., .,. .,./ / .,. .,.5 .,. .,.9 9 ./ ./.1 ./.1 ./., ././ ././ ./. ./. ./.5 ./.9 . ..1 .., .., .. ../ / .5 .5.1 .5., .5. .5./ / .9 .9.1 .9.1 .9., 5 5.1

INTERNAT NATIONAL ST STANDA NDARDS REFERENCES DEFINITIONS TERS ACRONYS S YOLS ACTI2ITIES DES DESCRIPTION AC3GROUND AND FIELD OF APPLICATION a!'4"o(% ai O(t!o) !o)e a a% o6 o6e! e!ttive ives Cos Coso7 o7i% i%at ate% e% $ie7 $ie7%s %s o$ a##7i ##7i!a !ati tio o Aa7*ti! a##"oa!& H YDRAULIC FACETS AND SIPLIFIED ETHOD Pe"i Pe"io% o% o$ Reso Resoa a! !e e a% a% 8av 8aves#e es#ee% e% (7' o%(7(s S("4 S("4e e #" #"ess( ess("e "e %(e %(e to to 2a 2a7ve 7ve !7o !7os( s("e "e 2a7ve C7os("e ti)e A!!e#ta!e C"ite"ia S("4 S("4e e #"es #"ess( s("e "e a% a% !av !avitat itatio io  GUIDELINE IN UILDING AN AD2ANCED SIULATION Gee ee"a7 Ca Ca7!( 7!(7atio atio  as ases Si)(7atio Ti)e Ste# F7(i% 7(i% #"o #"o#e" #e"ties ies %e %e$iit iitio io  Pi#i i#i4 4 )e!& )e!&a ai!a i!a7 #"o #"o#e"t e"ties ies P()#s #"o#e"ties 2a7ves PRESSURE OUTPUT AND ITIGATIONS STRATEGIES Gee"a7 Res( Res(7t 7ts s :it :it& o !avit avita atio io Res( Res(7t 7ts s :it& :it& !avi !aviti ties es 4e 4ee" e"at atio io  a% a% !o7 !o77a 7a#s #se e FORCES CALCULATIONS Fo"e:o"% Ua7a!e% $o"!es S("4 S("4e e Loa% Loa%s; s; Si)# Si)#7i 7i$i $ie% e% )et& )et&o% o% SURGE LOADS FRO SOFT8ARE SIULATIONS Res( Res(7t 7ts s :it :it& o !avit avita atio io Res(7ts :i :it& !a !avitatio APPENDI+ EQUATIONS FOR TRANSIENT SIULATIONS


Date 15/11/13

HYDRAULIC TRANSIENTS FOR LIQUIDS Pag.  di 39

1

SCOPE AND PURPOSE

),e *#*o!e o t,i! Co*oate Citeia i! to deine t,e g#ide+ine! o t,e ,da#+ic tan!ient ana+!e! o +i#id !!te! (#ge &na+!i!. 4da#+ic tan!ient ana+!e! can e cond#cted  ean o *e+iina ca+c#+ation! o  #!ing advanced !i#+ation !ot6ae7 accoding to t,e co*+eit7 t,e citica+it o t,e !!te! and t,e e#ied detai+ +eve+. ),i! Co*oate Citeia ai! to *ovide t,e a!ic *inci*+e! and t,eoetica+ e+eent! to ena+e t,e de!igne to "denti t,e ie+d o a**+ication o !#ge ana+!e! 'nde!tand t,e *,!ica+ *o+e! e+ated to t,e ,da#+ic tan!ient! Cond#ct a !i*+iied !#ge ana+!i! Find t,e g#ide+ine! to cond#ct a detai+ed !#ge ana+!i!  #!ing a !i#+ation !ot6ae &!!e!! t,e n#eica+ e!#+t! e+iai+it7 in *atic#+a o advanced !ot6ae !i#+ation. ),i! Co*oate Citeia a**+ie! to t,e engineeing and con!t#ction *o:ect! o intee!t o t,e (ai*e Go#*.

,

,.1

REFERENCE DOCUENTS

INTERNATIONAL STANDARDS

;1< Poce!! Pi*ing = &(>E %31.3 =2012

Poce!! Pi*ing

;2< EN 1380-3 2012

>eta++ic ind#!tia+ *i*ing - Pat 3 De!ign and ca+c#+ation

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REFERENCES

Cane Do#g+a!7 Ga!ioe?7 (6aie+d

F+o6 o +#id! t,o#g, va+ve!7 itting! and *i*e F+#id >ec,anic!


Date 15/11/13


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DEFINITIONS TERS

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ACTI2ITIES DESCRIPTION

.1

AC3GROUND AND FIELD

.1.1

OF APPLICATION

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'ndeta?ing (#ge ana+!i! o t,e di!tinctive !!te! *e!ented in t,i! !ection7 i! oten a contact#a+ e#ieent 6it,in t,e EPC contact!. Nevet,e+e!!7 #t,e t,an an contact#a+ e#ieent7 t,ee ae a n#e o !t#d ca!e! in 6,ic, !#ge ana+!i! i! not on+7 and not an +onge7 inte*eted a! a c,ec? / veiication ta!?7 #t eodie! a ea+ *o!itive conti#te in t,e #+tidi!ci*+ina de!ign7 !ince t,e Font End engineeing. (#ge ana+!i! o#tcoe deinite+ a in+#ence t,e *oce!! engineeing7 and a i*act on t,e *i*ing !#**ot! and civi+ !t#ct#e! de!ign a! 6e++. Fo t,i! ea!on7 t,i! activit ,a! eac,ed ,ig,e citica+it degee t,o#g, t,e ea!7 and i! no6 con!ideed a+o!t a! a !tandad *actice in t,e engineeing 6o?+o6. & dee* ?no6+edge in t,i! ie+d ,a! !*ead a+!o aong C#!toe!7 and it i! no6 a ?e ta!? to #i+d a !*eciic ?no6 ,o67 o#nded on !,aed and c+ea *inci*+e!7 a++o6ing to ceate and oe a !tandad Co*oate engineeing !evice o t,i! di!ci*+ine.

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ai O(t!o)e a% o6e!tives

Genea++7 !#ge ana+!e! ae *eoed to a!!e!! t,e eect! o !#dden c,ange! in ,da#+ic !tead !tate7 +eading to *otentia+ ove*e!!#e o 6ate ,ae con!e#ent to cavit co++a*!e. "n *atic#+a7 !i#+ation! ae t*ica++ #t not ec+#!ive+ cond#cted to deteine -

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Pe!!#e tend! con!e#ent to o*eative !cenaio t,at a invo+ve a tan!ient !#c, a! o*eating *#* !6itc, ove7 o !tat #* *oced#e7 6,o!e eect! ae deeed 6ot, inve!tigating7 d#e to con!idea+e diaete! o *#* !ie invo+ved.

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(#ge oce! acting on *i*e #n! in*#t o *i*ing +eii+it ana+!i! and !te!! ana+!i!

),e *#*o!e o t,e !#ge ana+!i! !t#d i! t,eeoe aied to ind itigation! and tec,nica+ !o+#tion! 6,eneve t,e o#tcoe i! not acce*ta+e in te! o !#ge *e!!#e7 o !#ge oce!7 o vac## geneation in t,e !!te.

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Coso7i%ate% $ie7%s o$ a##7i!atio

Re+ecting t,e aove7 (#ge &na+!e! ae t*ica++ cond#cted o 1. O-!ite *od#ct tan!e !!te a. e*ot !!te! o eined o cogenic *od#ct! to +oading teina+! Hett et,! o o!,oe teina+K . i*ot !!te! o eined o cogenic *od#ct! o o-!ite teina+! Hett et,! o o!,oe teina+K 2.

)an!e *i*e+ine! o +i#id! eined *od#ct! o 6ate

3.

@ide di!ti#tion net6o?! coo+ing 6ate !!te! once t,o#g, o coo+ing to6e cic#it!


Date 15/11/13


.1.

Aa7*ti! a##"oa!&

&n tie +i#id +o6! into *i*e!7 it i! nece!!a to !ee i !#ge ana+!i! i! to e *eoed. ),e ain *aaete! to e con!ideed ae -

Pi*ing +engt, Diaete Device! t,at co#+d geneate !#ge *#*!7 a#toatic va+ve!7 etc..

"n a!ence o !*eciic contact#a+ e#ieent!7 one ana+tica+ a**oac, to deteine 6,et,e a !#ge ana+!i! !t#d !,o#+d e #ndeta?en o not7 can e a!ed on t,e atio o t6o *aaete! -

t,e *i*eL! *eiod o e!onance τ !ee deinition in M .2.17 and

-

t,e tie )C !ee M .2.3 a!!ociated to t,e event e!*on!i+e o t,e tan!ient t*ica++ t,e va+ve c+o!#e tie.

)C / τ < 1

)C / τ > 1





I#ic? C+o!#e



advanced !i#+ation e#ied 1 )C / τ < 5



!i*+iied et,od

)C / τ > 57



Not citica+

(+o6 C+o!#e

Fo atio ) C / τ ,ig,e t,an 57 t,e !!te can e con!ideed not citica+7 and !#ge ana+!i! can e oitted. ),e atio ) C / τ anging o 1 to 5 e*e!ent! a++ t,o!e ca!e! o 6,ic, t,e +ine eten!ion can e citica+ co*aed to t,e ,*ot,etica+ va+ve c+o!#e tie o7 in ot,e 6od!7 a++ t,e ca!e! o 6,ic, t,e c+o!#e tie i! !ti++ #ic?7 co*aed to t,e +ine eten!ion7 and a geneate a**ecia+e !#ge *e!!#e7 6,o!e agnit#de a e 6ot, a!!e!!ing oe in detai+. Fo t,e!e ca!e!7 a *e+iina !#ge ana+!i! a!ed on t,e o#+a! given in M .27 can e #!e#+ to a!!e!! 6,et,e ai# e*ected *e!!#e accoding to E#ation 87 i! e+o6 t,e adi!!i+e7 o i an advanced !i#+ation! i! e#ied to ind an itigation.


Date 15/11/13


.,

H YDRAULIC FACETS

AND SIPLIFIED ETHOD

(oe a!ic e+eent! e+evant to t,e t,eo o 6ate ,ae ae !#aied in t,i! !ection7 in ode to ac,ieve t,e a!i! to eva+#ate a++ t,e *,!ica+ to*ic!7 and t,e *otentia+ citica+it o t,e ana+ed !!te!. ),e inoation given in t,i! !ection !,o#+d ena+e t,e de!igne to *oceed in a *e+iina !#ge ana+!i! ca+c#+ation o !i*+e !!te!.

.,.1

Pe"io% o$ Resoa!e a% 8aves#ee%

),e Peiod o Re!onance o t,e a!ic !!te e*e!ented in Fig. 1 i! deined a! τ  2 / c ;!ec<

E<(atio 1

@,ee -

 ;< i! t,e *i*e eten!ion o t,e !o#ce o t,e *et#ation #* to t,e e+ection *oint t,e c,ec? va+ve at *#* di!c,age

-

c ;/!< i! t,e !*eed o !o#nd t,o#g, t,e *i*e 6it, t,e con!ideed +i#id o e+a!tic 6ave!*eed. &n *et#ation geneating in t,e !!te7 6i++ t,en *o*agate a+ong t,e *i*e at !*eed c.

Fo an #nconined +i#id7 @ave!*eed can e eva+#ated a! o++o6!

E<(atio ,

c' =

k ⋅ 10 9 ;/!ec< ρ

@,ee -

k ;GPa< i! t,e F+#id co*e!!ii+it7 o %#+? >od#+#! !ee M .2.2

-

ρ ;?g/3< i! t,e F+#id den!it

"n a *i*e o a given geoet7 @ave!*eed ecoe!

E<(atio /

c= 1+

c' k ⋅ d

=

E ⋅ t

k ⋅109 / ρ k ⋅ d 1+ E ⋅ t

;/!ec<

@,ee -

E ;GPa< i! t,e Pi*e o#ng >od#+#!

-

d ;< i! t,e Pi*e intena+ diaete

-

t ;< i! t,e Pi*e 6a++ t,ic?ne!!

),e atio

 K ⋅ d     E ⋅ t  #antiie! t,e conti#te e+ated to *i*e adia+ deoai+it !#eeing eect. ),e !tie t,e *i*e 6a++! ae7 t,e #ic?e t,e 6ave tave+!  c incea!e! 6,en E and / o t incea!e. F#t,eoe7 c decea!e! 6,en *i*e diaete incea!e!.

Cr Cor Eng Prc 105 e Surge Analysis

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