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Safety Valve Discharge Capacity Calculation

Safety Valve Discharge Capacity Calculation

  • Medium is Air or Gas
  • Critical Condition:

 

  1. 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℃

  1. When  

   ,

 

  1. When ,

 

Table1---The Coefficient of gas properties for different K value

Value C of the property coefficient of the gases of different valve k

 

 

K
C
K
C
K
C
K
C
1.00
315
1.20
337
1.40
356
1.60
372
1.02
318
1.22
339
1.42
358
1.62
374
1.04
320
1.24
341
1.44
359
1.64
376
1.06
322
1.26
343
1.46
361
1.66
377
1.08
324
1.28
345
1.48
363
1.68
379
1.10
327
1.30
347
1.50
364
1.70
380
1.12
329
1.32
349
1.52
366
2.00
400
1.14
331
1.34
351
1.54
368
2.20
412
1.16
333
1.36
352
1.56
369
 
 
1.18
335
1.38
354
1.58
371
 
 

 

Hits:  UpdateTime:2016-07-20 11:44:54  【Printing】  【Close
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