SLIDES OF WATER HAMMER.ppt

7/21/2019 SLIDES OF WATER HAMMER.ppt

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WATER HAMMER

CALCULATION

USING CDB - SAIPEM’S

INHOUSE SOFTWARE



Water Hammer

Water hammer is pr!"#e! $he% the &i'"i! (&$i%)i% a pipe is s"!!e%&* !e#e&erate! t +er ,e&#it* *a (ast #&si%) ,a&,e. a press"re $a,e prpa)ates"pstream t the pipe i%&et/

Fr a% i%sta%ta%e"s (&$ stppa)e ( a tr"&*i%#mpressi&e (&"i! i% a% i%e&asti# pipe. the press"rerise $"&! e i%(i%ite/ Fi%ite #mpressii&it* ( the(&"i! a%! e&asti#it* ( the pipe &imit the press"re riset a (i%ite ,a&"e/



The ma0im"m press"re s"r)e is tai%e! $he% the,a&,e #&ses i% &ess time tha% the peri! t re'"ire! (rthe press"re $a,e t tra,e& (rm the ,a&,e t the pipei%&et a%! a#1. a tta& !ista%#e is 2L/

The press"re s"r)e $i&& e re!"#e! $he% the time ((&$ stppa)e e0#ee!s the pipe peri! t. !"e t#a%#e&&ati% et$ee% !ire#t a%! re(&e#te! $a,es/



Water hammer #a% e )e%erate! * 3 #&s"re ( ,a&,e.

starti%) r stppi%) ( p"mps.

#ha%)i%) e&e,ati% ( a reser,ir. $a,es % reser,ir



ABOUT THE CDB

CDB is Saipem’s i%h"se s(t$are !e,e&pe! *Remi Da"res/ It is "se! t sim"&ate stea!* state a%!tra%sie%t perati%s/

4a&i!ati% 3

A reprt ( ,a&i!ati% $as #arrie! "t i% 2552/ The#%#&"si%s are that the res"&ts are re&ia&e as &%)as there is % ,apri+ati%/ The treatme%t (#a,itati% has &ea!s t ,erpress"res $hi#h is mresi)%i(i#a%t tha% a#t"a&/



MODELISATION IN CDB

The %et$r1 is m!e&e! * %!es that #%%e#ti%) (

the ra%#hes r the e'"ipme%t/

Ea#h ra%#h is a"tmati#a&&* !i,i!e! i%t se)me%ts *

the pr)ram. a##r!i%) t the step ( time #hse% *

the "ser/

The "%!ar* #%!iti%s are spe#i(ie! i% (&$ r

press"re * e0ter%a& re)"&atrs/



UNITS

press"re 3 ar 6#a% e m!i(ie! * 1e*$r! 7atm89

(&$rate 3 m:;hr

!iameter 3 mm

&e%)th 3 1m time 3 se#%! 6#a% a&s "se the %tati% h3m3s r

m3s9



CDB outline

General data

tmx !"rati% ( sim"&ati%

dtc step ( time

dti step ( impse! time 6rep&a#e !t# i( the step ( time

ei%) (i0e!9

dtp peri! ( psti%)

out &iste! ( res"&t



Fluid characteristic prd %ame ( pr!"#t rho spe# )ra,it* i! ,is#sit*

6#St9 "md "&1 m!"&"s 6MPa9 ap ,apr press"re

Equipment description E0ter%a& Re)"&atr

E0ter%a& re)"&atr is "se! t spe#i(* a #%!iti% i% a %!e/

O%&* %e #%!iti% %ee! t spe#i(* i% ea#h e0ter%a& re)"&atr

xr# %ame ( e0ter%a& re)"&atr $mn mi%im"m (&$ 6m:;hr9

$mx ma0im"m (&$ 6m:;hr9 pmn mi%im"m press"re 6ar9

pmx ma0im"m press"re 6ar9



Pump: pum %ame ( p"mp n%h sh"t (( hea! 6m9 hea %mi%a&

hea! %lo !eit

Valves3 l %ame ( ,a&,e cmx ma0im"m ,a&,e #e(( cr ,a&,e

#"r,e

PSV: rl% %ame ( ,a&,e coec #e((i#ie%t ( press"re &ss dia

ri(i#e !iameter dpo !e&ta p pe%i%) dpc !e&ta p #&si%)



Accumulator or reservoir:The !i((ere%#e et$ee% a##"m"&atr a%! reser,ir is ase! %

the #e((i#ie%t p&*trpi# 6<9/ The e'"ipme%t is #%si!ere! as a

ta%1 i( < = 5 $hi&e it is a% a##"m"&atr i( < > 5/ The )as i% a##"m"&atr (&&$s the p&*trpi# re&ati% P4< =

#%sta%t/ I% the #ase ( )as i!ea&. the ,a&"e ( e0p%e%t $i&& eta1e% e'"a&i+es $ith < = ?/ I( the pr#ess is a!iaati# a%!

re,ersi&e. < = ?/@ a%! (r istherma& a%! ise%trpi# < = ?/2

With the < = 5. the press"re i% the ta%1 is #%si!ere! #%sta%t/

acc %ame ( a##"m"&atr &in i%&et %++&e #e((i#ie%t &ou "t&et %++&e #e((i#ie%t dia !iameter ( ri(i#e #am

#e((i#ie%t p&*trpi# ol i%itia& ,&"me mn mi%im"m

,&"me ( )as mx ma0im"m ,&"me ( )as



PID Regulator: ctr %ame ( re)"&atr pro prprti%a& #e((i#ie%t p 69

der !eri,ati,e #e((i#ie%t T! 6?;s9 int i%te)ra& #e((i#ie%t i6?;s9 !et C

(&&$e! * 3 nod %!e %"mer. i( the pi%t ( meas"reme%t is a %!e

6#%tr& ( press"re9 e$u %ame ( e'"ipme%t. i( the pi%t ( meas"reme%t is a%

e'"ipme%t 6#%tr& ( (&$9 e$u %ame ( e'"ipme%t par i%!e0 ( the ,aria&e. i( the

pi%t ( the meas"reme%t is a% e'"ipme%t $ith a #%tr& (a%ther ,aria&e e0#ept (&$

ctr %ame ( re)"&atr. i( the pi%t ( meas"reme%t is the"t&et ( a%ther re)"&atr



N!eN!e is "se! t spe#i(* the pipe se)me%t a%! their e&e,ati%

nod i!e%ti(i#ati% %"mer ( %!e ele pipe e&e,ati% 6m9l&p pi%t 1i&metri# 61m9 pre press"re 6ar9

remar1s 3 the i%itia& press"re ( the %!e is pti%a& the !e(i%iti% ( the %!es are %t %e#essar* $he% the

&e%)ths ( ea#h ra%#h is spe#i(ie! i% the &i%e &e)/ a%! thee&e,ati% ( the %!e is 5

* !e(a"&t e&e,ati% ( the %!e is same as the pre#e!i%)

%!e/ t spe#i(* sme %!es $hi#h ha,e same e&e,ati%.(&&$i%) %tati% #a% e app&ie!3 nod ?. 2. : ele r nod ? ele 'nod 2 'nod :



Net$r1 C%(i)"rati%

Bra%#hes 3 le# %ame ( ra%#h r pipe se)me%t nup "pstream %!e

%"mer ndn !$%stream %!e %"mer odi "tsi!e!iameter (th $a&& thi#1%ess rou r")h%ess ela pipee&asti#it* len &e%)th

I( the ra%#hes r pipe se)me%t has the same pipe prpert* 6"tsi!e!iameter. $a&& thi#1%ess. r")h%ess a%! e&asti#it*9 the% (&&$i%)%ti(i#ati% #a% e app&ie! 3

)d %ame ( )r"p ( !ata odi "tsi!e !iameter 6mm9(th $a&& thi#1%ess 6mm9 rou r")h%ess ela pipee&asti#it* 6Mpa9

E0amp&e 3

! PIPE? !i ?/: $th :/@5 r" 5/5? e&a 25555

&e) ?5 %"p ?5 %!% ?? PIPE? &e% 5/5@

&e) ?? %"p ?? %!% ?2 PIPE? &e% 5/5::



E'"ipme%t 3 e$u %ame ( e'"ipme%t nup "pstream %!e %"mer ndn

!$%stream %!e %"mer e$uipment &e*(ord 6s"#h as

pum. l r acc9 %ame ( e'"ipme%t as spe#i(ie! i%

e'"ipme%t !es#ripti%

E0amp&e 3

e'" P??5? %"p ?2 %!% ?: p"m PUMP5?



S#e%ari

tr! %ame ( e'"ipme%t tim time ? al ,a&"e ? tim time

2 al ,a&"e 2

a& is %e ( the 1e*$r!s spe#i(ie! e&$3

(r p"mp3 pup s"#ti% press"re

pdn !is#har)e press"re

$mx (&$rate

!pd spee! ( the p"mp 69 num a %"mer ( p"mps i% series



(r ,a&,e3 pco per#e%ta)e ( ,a&,e pe%i%) $mx (&$rate pup "pstream press"re pdn !$%stream press"re

(r e0ter%a& re)"&atr3 $mn mi%im"m (&$rate $mx ma0im"m (&$rate

pmn mi%im"m press"re pmx ma0im"m press"re



(r the )r"p ( !ata. (&&$i%) %tati%s are e'"i,a&e%t 3 e0amp&e (r p"mp3

tr! P??5? tim 5. ?5. 5. ?55 pco ?55. 5. 25. 5

OR

! PUMPSTOP tim 5 !pd ?55 tim ?5 !pd J ?5/ tim 25!pd / tim 2 !pd @/2? tim :@ J !pd :/ tim ?55 !pd 5

tr! P??5? PUMPSTOP



Pst pr#ess

Pst pr#ess is the r!er t treat the res"&t3 tre%! 6e'"ipme%t9

trn (i&e %ame e$u %ame ( e'"ipme%t ar e'"ipme%t ,aria&e

tre%! 6%!e9

trn (i&e %ame nod %!e %"mer ar %!e

,aria&e

#p* the (i&es

cp* !esti%ati% (i&e (i&e ? K (i&e 2 K (i&e : K //



Graph

#p* /(i) 6%ame ( (i&e9 /t0t 6(rmat ( )raph9 K /pr% 6the(i&e $hi#h #%tai% the res"&t that $i&& e tra%s(erre! t the)raphi# (rmat9

The &ist ( #mma%! i% the /t0t (i&e is as (&&$3

TI tit&e 6pti%a&9 L &e)e%! ( a0is L &e)e%! ( r!i%ate ? mi%im"m a0is 2 ma0im"m a0is D !e&ta

? mi%im"m 2 ma0im"m D !e&ta LI st*&e a%! thi#1%ess

SLIDES OF WATER HAMMER.ppt

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