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SHEET FOR VALVE SIZING CALCULATIONS.
CONDITION - FLOW MEDIUM LIQUID / FLOW IS BY WEIGHT.
INPUT DATA
1 SERVICE FLUID LIQUID
2 FLOW RATE (1000 Kg/hr) MAX / NOR / MIN (w) 5 7 10
3 5
4 4
5 DELTA P - SIZING (BAR) 1
6 320
7 SPECIFIC GRAVITY (G) 1.1
Since DELTA P < P1/2. Therefore, flow is subcritical.
5.8 8.2 11.7
INLET PRESSURE (P1) BARA
OUTLET PRESSURE (P2) BARA
FLUID TEMPERATURE (T) 0K
Formula for C v Calculation ( Flow By Weight )
Cv = 1.16w / S Gr x DELTA P
Cv(max) = Cv(Nor) = Cv(Min) =
FROM mm OF wc
CONVERSIONS :
1 TO CONVERT PRESSURE.
FROM Kg/Cm2 (g)
FROM BAR
2 TO CONVERT TEMPERATURE.
Gr = G x ( 288 / T ) = 0.990
Since DELTA P < P1/2. Therefore, flow is subcritical.
Since DELTA P > P1/2. Therefore, flow is critical.
FROM 0 C
Where Gr = Specific Gravity of the fluid at flowing temperature.
0.000 bar
TO CONVERT PRESSURE.
INPUT VALUE IN BARA
1.0130
1.0130
TO CONVERT TEMPERATURE.
INPUT
273
VALUE IN 0K.
SHEET FOR VALVE SIZING CALCULATIONS.
CONDITION - FLOW MEDIUM LIQUID / VOLUMETRIC FLOW.
INPUT DATA
1 SERVICE FLUID LIQUID
2
3
4
5 DELTA P - SIZING (BAR) 0
6
7 SPECIFIC GRAVITY (G)
Since DELTA P > P1/2. Therefore, flow is critical.
#DIV/0! #DIV/0! #DIV/0!
FLOW RATE (m3/hr) MAX / NOR / MIN (Q)
INLET PRESSURE (P1) BARA
OUTLET PRESSURE (P2) BARA
FLUID TEMPERATURE (T) 0K
Formula for C v Calculation ( Flow By VOLUME )
Cv = 1.16QS Gr / DELTA P
Cv(max) = Cv(Nor) = Cv(Min) =
Gr = G x ( 288 / T ) = #DIV/0!
Since DELTA P < P1/2. Therefore, flow is subcritical.
Since DELTA P > P1/2. Therefore, flow is critical.
Where Gr = Specific Gravity of the fluid at flowing temperature.
FROM mm OF wc 0.000 bar
CONVERSIONS :
1 TO CONVERT PRESSURE.
INPUT VALUE IN BARA
FROM Kg/Cm2 (g) 4 4.9358
FROM BAR 1.013
2 TO CONVERT TEMPERATURE.
INPUT
273
VALUE IN 0K.
FROM 0 C
SHEET FOR VALVE SIZING CALCULATIONS.
CONDITION - FLOW MEDIUM GAS / FLOW IS BY WEIGHT.
INPUT DATA
1 SERVICE FLUID GAS
2
3
4
5 0
6
7
8
Since DELTA P > P1/2. Therefore, flow is critical.
#DIV/0! #DIV/0! #DIV/0!
FLOW RATE (1000 Kg/hr) MAX / NOR / MIN (w)
INLET PRESSURE (P1) BARA
OUTLET PRESSURE (P2) BARA
DELTA P - SIZING (BAR)
FLUID TEMPERATURE (T) 0K
SPECIFIC GRAVITY (G)
COMPRESSABILITY FACTOR (Z)
Formula for C v Calculation ( Flow By Weight )
Cv = 47.2 w S Z / S (DELTA P x (P1 + P2) Gr)
Cv(max) = Cv(Nor) = Cv(Min) =
GAS
Gr = G x ( 288 / T ) = #DIV/0!
Since DELTA P < P1/2. Therefore, flow is subcritical.
Since DELTA P > P1/2. Therefore, flow is critical.
Where Gr = Specific Gravity of the fluid at flowing temperature.
FROM mm OF wc 0.000
CONVERSIONS :
1 TO CONVERT PRESSURE.
INPUT VALUE IN BARA
FROM Kg/Cm2 (g) 1.0130
FROM BAR 1.0130
2 TO CONVERT TEMPERATURE.
INPUT
273
/2. Therefore, flow is subcritical.
VALUE IN 0K.
FROM 0 C
bar
SHEET FOR VALVE SIZING CALCULATIONS.
CONDITION - FLOW MEDIUM GAS / FLOW IS BY VOLUME.
INPUT DATA
1 SERVICE FLUID GAS
2 10800 3600 4140
3 0.000 0.000 0.000
4 0.000 0.000 0.000
5 0.001 0.001 0.002
6 318
7 1
8 1
Since DELTA P > P1/2. Therefore, flow is critical.
#DIV/0! #DIV/0! #DIV/0!
FLOW RATE (m3/hr) MAX / NOR / MIN (Q)
INLET PRESSURE (P1) BARA
OUTLET PRESSURE (P2) BARA
DELTA P - SIZING
FLUID TEMPERATURE (T) 0K
SPECIFIC GRAVITY (G)
COMPRESSABILITY FACTOR (Z)
Formula for C v Calculation ( Flow By Volume )
Cv = (Q / 295) S (G x T x Z) / (DELTA P x (P1 + P2))
Cv(max) = Cv(Nor) = Cv(Min) =
q 10 20 17.99
2.6 17 14.1
Since DELTA P < P1/2. Therefore, flow is subcritical.
Since DELTA P > P1/2. Therefore, flow is critical.
q1 q2 q3
CV
CV1 CV2
q 4740 6420 5580.0032 36 34.0
q1 q2 q3
CV
CV1 CV2
CONVERSIONS :
1 TO CONVERT PRESSURE.
INPUT VALUE IN BARA
FROM Kg/Cm2 (g) 3 3.9551
FROM BAR 0.001 1.0140
FROM mm OF wc 10 0.001 bar
2 TO CONVERT TEMPERATURE.
INPUT
45 318
1.0135 1.0135
1.014 1.014
1.0149 1.0149
VALUE IN 0K.
FROM 0 C
CONDITION - FLOW MEDIUM GAS / FLOW IS BY WEIGHT.
INPUT DATA
1 SERVICE FLUID GAS
2 120
3 6.1
4 2
5 4.1
6 373
7 1.16
8 1
9 CRITICAL FLOW FACTOR 0.8
Since DELTA P > P1/2. Therefore, flow is critical.
1244.3 0.0 0.0
SHEET FOR VALVE SIZING CALCULATIONS FOR FLOW IN KG / HR & DP > P1/2
FLOW RATE (1000 Kg/hr) MAX / NOR / MIN (w)
INLET PRESSURE (P1) BARA
OUTLET PRESSURE (P2) BARA
DELTA P - SIZING (BAR)
FLUID TEMPERATURE (T) 0K
SPECIFIC GRAVITY (GF)
COMPRESSABILITY FACTOR (Z)
Formula for C v Calculation ( Flow By Weight )
Cv = 54.5 w S Z / (CF x P1 x S GF )
Cv(max) = Cv(Nor) = Cv(Min) =
GAS
Gr = G x ( 288 / T ) = 0.896
SHEET FOR VALVE SIZING CALCULATIONS FOR FLOW IN KG / HR & DP > P1/2
Since DELTA P < P1/2. Therefore, flow is subcritical.
Since DELTA P > P1/2. Therefore, flow is critical.
Where Gr = Specific Gravity of the fluid at flowing temperature.
FROM mm OF wc 0.000
CONVERSIONS :
1 TO CONVERT PRESSURE.
INPUT VALUE IN BARA
FROM Kg/Cm2 (g) 1.0130
FROM BAR 1.0130
2 TO CONVERT TEMPERATURE.
INPUT
100 373
/2. Therefore, flow is subcritical.
VALUE IN 0K.
FROM 0 C
bar
SHEET FOR VALVE SIZING CALCULATIONS.
CONDITION - FLOW MEDIUM GAS / FLOW IS BY VOLUME.
INPUT DATA
1 SERVICE FLUID GAS
2 1575 1365
3 8.013 8.013
4 7.513 7.513
5 0.500 0.500
6 333
7 0.865
8 1
SELECTED Cv 258
Match Factor (M) 1
Since DELTA P < P1/2. Therefore, flow is subcritical.
= 0.0
FLOW RATE (m3/hr) MAX / NOR / MIN (Q)
INLET PRESSURE (P1) BARA
OUTLET PRESSURE (P2) BARA
DELTA P - SIZING
FLUID TEMPERATURE (T) 0K
SPECIFIC GRAVITY (G)
COMPRESSABILITY FACTOR (Z)
Formula for C v Calculation ( Flow By Volume )
DP
GAS 343
220.5
8.013
2.513
5.500
q 80 90 93.89
230 258 268.9
Since DELTA P < P1/2. Therefore, flow is subcritical.
Since DELTA P > P1/2. Therefore, flow is critical.
q1 q2 q3
CV
CV1 CV2
CONVERSIONS :
1 TO CONVERT PRESSURE.
INPUT VALUE IN BARA
FROM Kg/Cm2 (g) 3 3.9551
FROM BAR 1.0130
FROM mm OF wc 10400 1.010
2 TO CONVERT TEMPERATURE.
INPUT
273
/2. Therefore, flow is subcritical.
VALUE IN 0K.
FROM 0 C
VALUE IN BARA
3.9551
1.0130
1.010 bar
273
VALUE IN 0K.
