PSV sizing calculator – fire case for gas filled vessel

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Pressure Safety valve sizing calculator for fire case for a gas filled vessel.

Vessel Diameter		m
Vessel Length (TL-TL)		m
Vessel height above ground		m
Vessel Orientation	Horizontal垂直
Type of head	SphericalElliptical
Area considered for calculation	Total areaArea exposed to fire
Environmental Factor
Set pressure		barg
Accumulation		%
Type	BalancedConventional
Back pressure		barg
Coefficient of discharge Kd		(max=0.975)
Rupture disk upstream to PSV ?	YesNo
Is released fluid steam ?	YesNo
Operating pressure		barg
Operating temperature		0C
Relieved Vapor Desnity		kg/m3
Isentropic coefficient (Cp/Cv)s
Moleculare weight
Compressibility factor (Z)
Relieving pressure		barg
Relieving temperature		0C
Exposed area		m2
Minimum orifice area requirement		cm2

The calculated area is the minimum orifice area required to allow the discharge of gas. The actual orifice area is the next higher available area. Following table presents the standard orifices with their designating letters and corresponding area.

Area (cm2)	Designating letter	Valve size (inch)
0.71	D	1D2 / 1.5D2 / 1.5D3
1.26	E	1E2 / 1.5E2 / 1.5E3
1.98	F	1.5F2 / 1.5F3
3.25	G	1.5G3 / 2G3
5.06	H	1.5H3 / 2H3
8.3	J	2J3 / 3J4
11.86	K	3K4 / 3K6
18.49	L	3L4 / 4L6
23.2	M	4M6
28	N	4N6
41.2	P	4P6
71.2	Q	6Q8
103	R	6R8 / 6R10
168	T	8T10