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Safety Valve Discharge Capacity Calculation
發佈日期：2020/4/11
Safety Valve Discharge Capacity Calculation
Medium is Air or Gas
Critical Condition:
Sub-critical Condition:
In the Formula:
Ws---The Discharge Capacity of Safety Valve, Kg/h
K---The Discharge Coefficient, related to the structure of safety valve, provided by the manufacturer, also can be selected upon the following:
Full Lift Safety Valve, K=0.75∼0.81
Low Lift Safety Valve, K=0.2∼0.3
Pd---The Discharge Pressure of Safety Valve (Absolute pressure)、Pd=1.1Ps+0.1MPa
Ps---The Set Pressure of the safety valve, MPa
Po---The Outlet pressure of the safety valve, MPa
A----The minimum exhaust sectional area of safety valve, mm2
Fully Lift Safety Valve, when,
Low Lift Safety Valve, when,
In the formula: h---the opened height of the safety valve, mm
d1---The minimum diameter of flowing area(throat diameter), mm
D---The diameter of seat ring, mm
C---Coefficient of gas property, (Reference to the table 1)
K---Absolute heat index of gas,
M---Mole Mass of gas, kg/mol
T---The Temperature of the gas, K
Z---The compressed coefficient of gas under the operation temperature and pressure.
Medium is Liquid
In the Formula:
Kp---Overpressure regulating value
25% overpressure, Kp=1.0
20% overpressure, Kp=0.8
10% overpressure, Kp=0.6
Kv---Intensity Regulating Value
U---The absolute Intensity of the flowing medium temperature
.ρ---The liquid density at the valve inlet temperature, kg/m3
P----The Pressure drop of the Inlet and Outlet Pressure, Mpa
,
Ps---Set Pressure, Pb---- Back Pressure (guage pressure)
Medium is Saturated Steam
When the Saturated Steam is≥98%, the maximum working heat is 10℃
When
,
When ,
Table1---The Coefficient of gas properties for different K value
Value C of the property coefficient of the gases of different valve k