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Calculation of Flow capacity

  Calculation equation Description of symbols in the equation
1

Flow capacity (for gas) When the P2/P1value is below the value
corresponding toκ

W : Flow capacity [kg/ h]
C : Value corresponding toκ
[-]
K : Coefficient of discharge.
As per Fig.1 or our standard value
[-]
P1 : Relieving pressure (abs) [kgf/㎠-A, MPa-A]
P2 : Back pressure (abs) [kgf/㎠-A, MPa-A]
A : Effective flow area(πDL) [㎠]
M : Molecular weight [-]
T : Relieving temperature(abs) [K]
Z : Compressibility factor.
“1”when not known
[-]
κ : Ratio of specific heats [-]
2

Flow capacity (for gas) When the P2/P1value is above the
value corresponding toκ

3

Flow capacity (for liquid)



(BY HIGH PRESSURE GAS SAFETY LAW)

W : Flow capacity of relief valve [kg/h]
K : Integrated outflow coefficient(0.6 or less) [-]
A : Effective outflow area(πDL) [㎠]
P : Differential pressure at discharge
section of the relief valve
[kgf/㎠]
G : Sloecific gravity of fluid [-]
     
(Note)When MPa is entered in P, divide the calculated value (W) by 0.313155.
4

Flow capacity (for gas)



(BY JIS B8210)

W : Flow capacity [kg/h]
C' : Constant for κ
(ratio of specific heats)
As per Fig.3
[-]
Kd : Coefficient of discharge.
As per Fig.2 or our standard value
[-]
A : Effective flow area(πDL) [㎟]
P1 : Relieving pressure (abs) [kgf/㎠-A, MPa-A]
M : Molecular weight [-]
T : Relieving temperature (abs) [K]
Z : Compressibility factor.
“1” when not known
[-]
Kb : Back pressure correction factor [-]
     
(Note) When MPa is entered in P1, divide the calculated value (W) by 0.0980665.
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