Gas & Vapor Sizing Required Sizing Data Fluid Properties Fluid
O2
State
gas
Molecular Weight Specific Gravity Liquid (referred to water)
32.00
Gas (referred to air) 1.39
Ratio of specific heats (k)
1
Compressibility factor, Z
Operating Conditions Operating Pressure (max)
kPag
Operating Temperature (max)
ºC
Max. Allowable Working Press
Relieving Conditions Required Relieviing Capacity Gas or Vapor (kg/hr), W Gas or Vapor (Sm3/min) Liquid (Liter/min) Set Pressure Allowable Overpressure % Superimposed Backpressure (specify constant or variable) Built-Up Back Pressure Relieving Temperature
45.79 45.79 kg/hr kg/hr
70 kPag kPag 10% kPag kPag 30 ºC
Calculation 10% Overpressure (kg/hr) Tag
1190-PSV-060
A= A= C K Kb M
0.0466 0.0466 sq inch inch 30.0 30.06 6 mm mm2 2 355.37 0.975 1 31.999
P1 T W Z
178 kPa 303 Kelvin 45.787 Kg K g/hr 1
Min Min Eff Eff Disc Discha harg rge e Area Area Coeff from ratio of spec heats. effective coeff of discharge. 0,975 Capacity correction due to back pressure Mol weight Relieving pressure = Set Pressure + overpressure + atm pressure. temp of fluid at valve inlet Required relieving capacity, kg/hr Compressibility factor
Critical Temperature
154.94 K
Reduced Temp
2.0
Critical Pressure
5042.7 kPaa
Reduced Press
0.0
=to 315 if unknow With superimposed constant back press exceding critical, Table T7-1. for b Table T7-7 or =to 315 if unknow
fig F7-1. Use 1 if unknown
Gas & Vapor Sizing Required Sizing Data Fluid Properties Fluid
Helium
State
gas 4
Molecular Weight Specific Gravity Liquid (referred to water) Gas (referred to air)
1.6703
Ratio of specific heats (k)
1
Compressibility factor, Z
Operating Conditions Operating Pressure (max)
kPag
Operating Temperature (max)
ºC
Max. Allowable Working Press
Relieving Conditions Required Relieviing Capacity Gas or Vapor (kg/hr), W Gas or Vapor (Sm3/min) Liquid (Liter/min) Set Pressure kPag Allowable Overpressure % Superimposed Backpressure (specify constant or variable) Built-Up Back Pressure (kPag) Relieving Temperature ºC
17.63
70 kPag 10% kPag kPag 30 ºC
Calculation 10% Overpressure (kg/hr) Tag
1190-PSV-082
A= A= C K Kb M
0.0477 sq inch 30.79 mm2 377.89 0.975 1 4
P1 T W Z
178 kPa 303 Kelvin 17.63 Kg/hr 1
Min Eff Discharge Area Coeff from ratio of spec heats. effective coeff of discharge. 0,975 Capacity correction due to back pressure Mol weight Relieving pressure = Set Pressure + overpressure + atm pressure. temp of fluid at valve inlet Required relieving capacity, kg/hr Compressibility factor
Critical Temperature Critical Pressure
5.2 K
Reduced Temp
58.3
228.99 kPaa
Reduced Press
0.8
=to 315 if unknow With superimposed constant back press exceding critical, Table T7-1. for b Table T7-7 or =to 315 if unknow
fig F7-1. Use 1 if unknown
Gas & Vapor Sizing Required Sizing Data Fluid Properties Fluid State Specific Gravity Liquid (referred to water) Gas (referred to air) Ratio of specific heats (k) Compressibility factor, Z
Operating Conditions Operating Pressure (Kpag maximum) Operating Temperature (ºC maximum) Max. Allowable Working Pressure
Relieving Conditions Required Relieveing Capacity Gas or Vapor (kg/hr), W Gas or Vapor (Sm3/min) Liquid (Liter/min) Set Pressure kPag Allowable Overpressure % Superimposed Backpressure (kPag) (specify constant or variable) Built-Up Back Pressure (kPag) Relieving Temperature ºC
Calculation 10% Overpressure (kg/hr)
A= C K Kb M
255.16 344 0.975 1 19
P1 T W Z
1696 323 2675 1
Natural Gas
1
2675
1450 kPag 10%
50 ºC
Min Eff Discharge Area Coeff from ratio of spec heats. effective coeff of discharge. 0,975 Capacity correction due to back pressure Mol weight Relieving pressure = Set Pressure + overpressure + atm pressure. temp of fluid at valve inlet Required relieving capacity, kg/hr Compressibility factor
mm2 Table T7-7 or =to 315 if unknow With superimposed constant back press e Table T7-7 or =to 315 if unknow
kPa Kelvin Kg/hr fig F7-1. Use 1 if unknown
ceding critical, Table T7-1. for bellows or Series BP with superimposed or variable back pressure, fi
F7-2. For pilot, page 7--4
Gas & Vapor Sizing Required Sizing Data Fluid Properties Fluid
O2
State
gas
Molecular Weight Specific Gravity Liquid (referred to water)
32.00
Gas (referred to air) 1.40
Ratio of specific heats (k)
1
Compressibility factor, Z
Operating Conditions Operating Pressure (max)
kPag
Operating Temperature (max)
ºC
Max. Allowable Working Press
Relieving Conditions Required Relieviing Capacity Gas or Vapor (kg/hr), W Gas or Vapor (Sm3/min) Liquid (Liter/min) Set Pressure Allowable Overpressure % Superimposed Backpressure (specify constant or variable) Built-Up Back Pressure Relieving Temperature
45.67 kg/hr
70 kPag 10% kPag kPag 30 ºC
Calculation 10% Overpressure (kg/hr) Tag
1190-PSV-060
A= A= C K Kb M
0.0612 sq inch 39.49 mm2 356.06 0.739 1 31.999
P1 T W Z
178 kPa 303 Kelvin 45.669 Kg/hr 1
Min Eff Discharge Area Coeff from ratio of spec heats. effective coeff of discharge. 0,975 Capacity correction due to back pressure Mol weight Relieving pressure = Set Pressure + overpressure + atm pressure. temp of fluid at valve inlet Required relieving capacity, kg/hr Compressibility factor
Critical Temperature
154.94 K
Reduced Temp
2.0
Critical Pressure
5042.7 kPaa
Reduced Press
0.0
=to 315 if unknow With superimposed constant back press exceding critical, Table T7-1. for b Table T7-7 or =to 315 if unknow
fig F7-1. Use 1 if unknown
Gas & Vapor Sizing Required Sizing Data Fluid Properties Fluid
Helium
State
gas 4
Molecular Weight Specific Gravity Liquid (referred to water) Gas (referred to air)
1.63
Ratio of specific heats (k)
1
Compressibility factor, Z
Operating Conditions Operating Pressure (max)
kPag
Operating Temperature (max)
ºC
Max. Allowable Working Press
Relieving Conditions Required Relieviing Capacity Gas or Vapor (kg/hr), W Gas or Vapor (Sm3/min) Liquid (Liter/min) Set Pressure kPag Allowable Overpressure % Superimposed Backpressure (specify constant or variable) Built-Up Back Pressure (kPag) Relieving Temperature ºC
17.63
70 kPag 10% kPag kPag 30 ºC
Calculation 10% Overpressure (kg/hr) Tag
1190-PSV-082
A= A= C K Kb M
0.0481 sq inch 31.04 mm2 374.85 0.975 1 4
P1 T W Z
178 kPa 303 Kelvin 17.63 Kg/hr 1
Min Eff Discharge Area Coeff from ratio of spec heats. effective coeff of discharge. 0,975 Capacity correction due to back pressure Mol weight Relieving pressure = Set Pressure + overpressure + atm pressure. temp of fluid at valve inlet Required relieving capacity, kg/hr Compressibility factor
Critical Temperature Critical Pressure
5.2 K
Reduced Temp
58.3
228.99 kPaa
Reduced Press
0.8
=to 315 if unknow With superimposed constant back press exceding critical, Table T7-1. for b Table T7-7 or =to 315 if unknow
fig F7-1. Use 1 if unknown
