Orifice Letter A Orifice Area
(seeAPI table)
mm 2Calculated Orifice Area (from data sheet)
N Number of Working Valves P s Set Pressure Bar
o
C o K o
C
o
K Ratio of Specific Heats (Cp/Cv)
K=1.4 for Air
W z Data Sheet Discharge Rate kg/hr W m Actual Discharge Rate (WzA/N.Ac)
kg/hr W Actual Discharge Rate (W m /3600)
kg/sec
Molecular Weight M=28.97 for Air R t Gas Consant
(8314/M) J/g o k g
Acceleration due to Gravity
m/sec 2
A c mm 272048516774446RELIEF VALVE FORCES
OPEN AND CLOSED GAS/VAPOUR SYSTEMS
NOMENCLATURE
VALVE NO:TYPE:4021
2
OUT OF BALANCE FORCES
TYPE 1
F 2F 3F 4
5278.727405N
5100.872394
T 2117.0617317375007
446
61418K T 1F 118
461.889.81
N
8245.373273M N
TYPE 2
Inlet Temperature Max Exit Temperature N
1.29 TYPE 3T
