Download - Spreadsheet - Gas Blanketed Tanks - Outbreathing Process Calculations & Control Valve Sizing - Rev2
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8/17/2019 Spreadsheet - Gas Blanketed Tanks - Outbreathing Process Calculations & Control Valve Sizing - Rev2
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Process and Physca! Para"e#ers
Para"e#er
Ser$ce (Tan%)
&!'d (S#ored n Tan%)s
Ser$ce (PCV)
&!'d (Thro'h PCV)
Vo!'"e o Tan% (V#%)
O*era#n Press're o Tan%
O*era#n Te"*era#'re o Tan%
+o!ec'!ar ,eh# o Gas (&or Ar ./0121 3"o!)
Co"*ress4!#y &ac#or o Gas (I dea! en#er 5)
S#andard 6ens#y o Gas (&or Ar aro'nd 50.. K3"7)Gas Re!ease Press're 6o8ns#rea" o O'#!e# PCV
S#e +n"'" A"4en# Te"*era#'re
S#e +a9"'" A"4en# Te"*era#'re
6esn :ac%ro'nd ; This spreadsheet focuses on Design Calculation of O%nlet li/uid 0owrates are considered and the Tank $ir Outbreathing Flowrates
gi#en C# is selected and the calculated C# re/uired is copared against it,
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:!an%e# Gas &!o8n Cond#ons (In!e# #o PCV)
6ens#y o Tan% In!e# Iner# C'shon Gas a# &!o8n Cond#ons
S*ec
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D-&ac#or (As Per API .??? #h Ed#on)
Nor"a! Te"*
Nor"a! Press're
S#d0 Te"*
S#d0 Press're
Ac#'a! Te"*0Ac#'a! Press're
To#a! O'#4rea#hn Gas &!o8 Ra#e Re@'red
Tan% O'#!e# PCV Process Para"e#ers
In!e# &!'d (Iner# Gas) +ass &!o8 Ra#e
6esn &!o8 +arn (Ty*ca!!y 507)
6esn +ass &!o8 Ra#e (8)
Ra#o o S*ec
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In!e# &##n =ead Loss Coe>cen# (K)
O'#!e# PCV SnF
Va!$e +an'ac#'rer
Va!$e +ode! Se!ec#ed
Se!ec#ed Va!$e Ra#ed +a9"'" (&!o8 Coe>cen#) CV5
P*n Geo"e#ry &ac#or (&*)
+odcen# (O'#!e#Red'cer) (K:.)
O$era!! Press're Loss Coe>cen# ( K H K5K.K:5-K:.)
NOTE ; Sizing has been done based on English 1nits )Psi2 3b4ft52 inch etc,+ since Cis the sae since the re/uired answers are in "atios or percentages, 7here#er re/
Se!ec#ed Va!$e Ra#ed Press're 6ro* Ra#o &ac#or(&ro" +an'ac#'rer or #he Ta4!e) (X#)
Se!ec#ed Va!$e Cr#ca! &!o8 Cond#on Press're 6ro* Ra#o &ac#or(X")
Press're 6ro* across Va!$e or Va!$e Press're 6Jeren#a! (P5-P. or
P)
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EJec#$e Press're 6ro* Ra#o (X EJ)
Gas E9*anson &ac#or (D)Ca!c'!a#ed Ca*ac#y &ac#or Re@'red (CV.)
Ra#ed Ca*ac#y &ac#or o Va!$e (CV5)
Va!$e O*enn Re@'red (CV.3CV5)
Is Va!$e Se!ec#ed S'#a4!e B
Cr#ca!#y :y
Genera! G'de!ne Chec%s
50 Is Va!$e O*enn A4o$e 5? B
50 Is Va!$e O*enn :e!o8 /? B
.0 Is Va!$e End Se S"a!!er #han or E@'a! #o Lne Se B
70 Is 6esn &!o8 +arn a#!eas# 507 B
NOTES
Cr#ca! or S'4-Cr#ca! &!o8 B (Cho%ed or No# Cho%ed) To help deterine E8ecti#e Pressure Drop "atio
Conc!'sons ;a, The Outbreathing "e/uireents are calculated as per the new $P% (etho There is an alternati#e ethod for snall sized tanks that satisf! speci6c crite4, %n general2 Val#es can also be allowed to operate under Choked Flow Con
possible is the rated #al#e critical pressure drop ratio, %n non choked );on9crc, For Val#e Openings which are too low2 #erif! the acceptabilit! and whethe.enerall! ne#er select a #al#e greater than the line size,d, %f the 3i/uid stored in the Tank is #olatile2 the outbreathing re/uireents
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EXPANSION TANK -
Un#s Va!'e
Cushion .as %nlet for PCV
$ir
5 '
psia
kpaa ?' @+Solution
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oC 55,55
oF BB,'*
oC ,*'
g45 50??/
lb4ft5 ?0?7
50???
74&, B,''
',''
74, oC
kPa ','''
g ','''kPa ','>'
g ',5*>
;O
B',>?
-elow B&
B,'''
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',5&'
.705
kpaa 5?507.
.//0
kpaa 5?507.
.10/
kpaa /50???
;54hr ?02.
S54hr ?0221
54hr ?02
g4hr ?021
$54hr ?02
g4hr ?021
g4hr ',>BA
lb4hr
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','''
','''
?0???
Carraro
','5<
',*''
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Uncho%ed or S'4-Cr#ca! &!o8
?077
',AA?0???/1
?0?75??
.0/
S'#a4!e
:'# Ta%e Care d'e #o Very Lo8 In!e# &!o8
No Cr#ca!#y
NO Very Acce*#a4!#y NO
DES Good DES
DES Good DES
DES Good DES
as stated in $P% &'''2 *th Edition2 5,5,&,ria gi#en in $nnex $ of the $P% std, The newer ethod isitions, %f #al#es operate at higher pressure drop ratios th
itical+ 0ows2 the pressure drop is deterined b! the gener the #al#e opens or not for that 0owrate and pressure,
hange2 but that has been accounted for in the Outbreath
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r 4s
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UTLET CONTROL VALVE SIZING (GAS)
Va!'e Va!'e
Cushion .as %nlet for PCV Cushion .as %nlet for PCV
$ir $ir
' '
?
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55,55 55,55
BB,'* BB,'*
,*' ,*'
50??/ 50??/
?0?7 ?0?7
50??? 50???
B,'' B,''
','' ',''
;O ;O
B',>? B',>?
-elow B& -elow B&
B,''' B,'''
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',5&' ',5&'
.705 .705
5?507. 5?507.
.//0 .//0
5?507. 5?507.
.10/ .10/
/50??? /50???
?02. ?02.
?0221 ?0221
?02 ?02
?021 ?021
?02 ?02
?021 ?021
',>BA ',>BA
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',''' ','''
',''' ','''
?0??? ?0???
Carraro Carraro
','5< ','5<
',*'' ',*''
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Uncho%ed or S'4-Cr#ca! &!o8 Uncho%ed or S'4-Cr#ca! &!o
?077 ?077
',AA ',AA?0???/1 ?0???/1
?0?75?? ?0?75??
.0/ .0/
S'#a4!e S'#a4!e
No Cr#ca!#y No Cr#ca!#y
Very Acce*#a4!#y NO Very Acce*#a4!#y
Good DES Good
Good DES Good
Good DES Good
eneral in nature and ore conser#ati#e than the Old ethod with the introan critical 0ow conditions2 then the e8ecti#e pressure drop ratio becoes th
ral pressure drop )1pstrea9downstrea+ across the #al#e,
ing "e/uireents )due to 0ow+ forula,
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Va!'e
Cushion .as %nlet for PCV
$ir
'
?' @+Solution
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55,55
BB,'*
,*'
50??/
?0?7
50???
B,''
',''
oC
','''
','''','>'
',5*>
;O
B',>?
-elow B&
B,'''
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','''
','''
?0???
Carraro
','5<
',*''
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Uncho%ed or S'4-Cr#ca! &!o8
?077
',AA?0???/1
?0?75??
.0/
S'#a4!e
No Cr#ca!#y
NO Very Acce*#a4!#y
DES Good
DES Good
DES Good
uction of new paraeters such as 3atitude2 Ccritical pressure drop ratio since at Choked
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:ass o Ca!c'!a#on
if ;& then &?,'
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Tank Operating Teperature
Calculated
Sec, 5,5,&,B2 $P% &''' )* Ed,+
Sec, 5,5,&,B2 $P% &''' )* Ed,+
Sec, 5,5,&,&2 $P% &''' )* Ed,+
$ssued sae as Tank Op, Tep
Sec, 5,5,&,52 $P% &''' )* Ed,+
$ssuing ;o %nsulation is conser#ati#esince adding insulation reduces 0ow
re/nt
$bo#e
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Sec, 5,5,&,52 $P% &''' )* Ed,+
Sec, 5,5,&,5,52 $P% &''' )* Ed,+
STP at , oC2 < at
;TP at 'oC2 < at
For Val#e Selected -elow
(asoneilan Control Val#e andbook and%S$ "eference
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Fro Val#e (anufacturer
See -lackonk "eference
See -lackonk "eference
(asoneilan "eference )Table+
Val#e Setpoint Decided b! us
$bient Outside 4 Exit Pressure
See Table attached orCrane or -lackonk reference
(asoneilan Control Val#e andbook and%S$ "eference
Fro Val#e (anufacturer orthe %S$ "eference table2 Sec, ?
(asoneilan Control Val#e andbook and%S$ "eference
(asoneilan Control Val#e andbook and%S$ "eference
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$ll "eferences$ll "eferences
See -lackonk "eference
Depends on .uidelines below
(argin b! which 0ow is Choked
See Carl -ranan "eference
See Carl -ranan "eference
See Carl -ranan "eference
See Carl -ranan "eference
(asoneilan Control Val#e andbook and%S$ "eference
%n Choked 0ow2 ax P Drop is CriticalVal#e P "atio2 else it is
e/ual to Val#e P Drop
9Factor2 :9Factor etc,low2 the highest pressure drop ratio
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VPMH=EXANE (Non Vo!a#!e)
-elow &> oC $bo#e and E/ual &> oC
-elow B& B ,>
-etween B& and >? 5 >
$bo#e >? &,> B
VP=EXANE (Vo!a#!e)
-elow &> oC $bo#e and E/ual &> oC
-elow B& ,> ,>
-etween B& and >? > >
$bo#e >? B B
Nor"a! Cond#ons
S#andard Cond#ons
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Ty*ca! X# Va!'es (Ra#ed Press're 6ro
' oC2 < at
, oC2
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Ra#o &ac#or)