安全阀反力计算



RELIEF VALVE FORCES
	OPEN AND CLOSED GAS/VAPOUR SYSTEMS
	VALVE NO:		4021		TYPE:		2
	OUT OF BALANCE FORCES
	TYPE 1			TYPE 2			TYPE 3
	NOMENCLATURE
		Orifice Letter				T
	A	Orifice Area			(seeAPI table)	16774		mm2
	Ac	Calculated Orifice Area				20485		mm2
		(from data sheet)
	N	Number of Working Valves				1
	Ps	Set Pressure				7		Bar
	T1	Inlet Temperature				173		oC
						446		oK
	T2	Max Exit Temperature				173		oC
						446		oK
	K	Ratio of Specific Heats			(Cp/Cv)	1.29
		K=1.4 for Air
	Wz	Data Sheet Discharge Rate				75007		kg/hr
	Wm	Actual Discharge Rate			(WzA/N.Ac)	61418		kg/hr
	W	Actual Discharge Rate			(Wm/3600)	17.06		kg/sec
	M	Molecular Weight				18
		M=28.97 for Air
	Rt	Gas Consant			(8314/M)	461.88		J/gok
	g	Acceleration due to Gravity				9.81		m/sec2
	F1			8245.373273		N
	F2			5278.727405		N
	F3			5100.872394		N
	F4					N