Rupture Disc Sizing

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• ASME SEC XIII DIV.1
• KS B ISO 4126
• API STD520
• Supplement

ASME SEC XIII DIV.1

Gas

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Equation
Term Definition	A	Required discharge area	[in²]
	W	Required discharge capacity	[lb/h]
	C	Function of k at discharge temperature	-
	K	Discharge coefficient	-
	P	Discharge pressure (Pset + allowable pressure + Patm)	[psia]
	T	Temperature	[°R]
	Z	Compressibility factor	-
	M	Molecular weight	-

Liquid

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Equation
Term Definition	A	Required discharge area	[in²]
	C	2,407	-
	K	Discharge coefficient	-
	Wt	Required flow rate	[lb/h]
	ρ	Liquid density	[lb/ft³]
	P	Discharge pressure (Pset + allowable pressure + Patm)	[psia]
	Pd	Back pressure	[psia]

Steam

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Equation
Term Definition	A	Required discharge area	[in²]
	P	Discharge pressure (Pset + allowable pressure + Patm)	[psia]
	K	Discharge coefficient	-
	W	Required flow rate	[lb/h]

KS B ISO 4126

Gas

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Equation
Term Definition	A	Required discharge area	[mm²]
	W	Required discharge capacity	[kg/h]
	C	Function of k at discharge temperature	-
	K	Discharge coefficient	-
	P	Discharge pressure (Pset + allowable pressure + Patm)	[bar.a]
	T	Temperature	K
	Z	Compressibility factor	-
	M	Molecular weight	-

Liquid

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Equation
Term Definition	A	Required discharge area	[mm²]
	Kdr	Discharge coefficient	-
	Kv	Viscosity coefficient	-
	Q	Required flow rate	[kg/h]
	v0	Specific volume of liquid	[m³/kg]
	P0	Discharge pressure (Pset + allowable pressure + Patm)	[bar.a]
	Pb	Back pressure	[bar.a]

Steam

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Equation
Term Definition	A	Required discharge area	[mm²]
	P0	Discharge pressure (Pset + allowable pressure + Patm)	[bar.a]
	Kdr	Discharge coefficient	-
	C	Function of k at discharge temperature, 2.656	-
	v0	Specific volume of steam	[m³/kg]
	Q	Required flow rate	[kg/h]

API STD520

Gas

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Equation
Term Definition	A	Required discharge area	[in²]
	W	Required discharge capacity	[lb/h]
	C	Function of k at discharge temperature	-
	Kd	Discharge coefficient	-
	P1	Discharge pressure (Pset + allowable pressure + Patm)	[psia]
	Kb	Back pressure coefficient	-
	Kc	Combination coefficient	-
	T	Temperature	[°R]
	Z	Compressibility factor	-
	M	Molecular weight	-

Liquid

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Equation
Term Definition	A	Required discharge area	[in²]
	Kd	Discharge coefficient	-
	Kw	Back pressure coefficient	-
	Kc	Combination coefficient	-
	Kv	Viscosity coefficient	-
	Q	Required discharge capacity	[gal/min]
	G1	Specific gravity of liquid	-
	P1	Discharge pressure (Pset + allowable pressure + Patm)	[psia]
	P2	Back pressure	[psia]

Steam

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Equation
Term Definition	A	Required discharge area	[in²]
	P1	Discharge pressure (Pset + allowable pressure + Patm)	[psia]
	Kd	Discharge coefficient	-
	Kb	Back pressure coefficient	-
	Kc	Combination coefficient	-
	KN	Napier coefficient	-
	KSH	Superheated steam correction coefficient	-
	W	Required flow rate	[lb/h]

Supplement

Capacity Correction Factor for Back Pressure

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Capacity Correction Factor for Viscosity

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Gas Properties

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Name	Chemical Formula	Molecular Weight (M)	Adiabatic Index (k)
Acetylene	C2H2	26.04	1.26
Air		28.97	1.40
Ammonia	NH2	17.03	1.31
Argon	Ar	39.95	1.67
Butadiene	C4H6	54.09	1.113
Benzene	C6H6	78.12	1.12
iso-Butane	iso-C4H10 or CH(CH3)3	58.12	1.10
n-Butane	n-C4H10	58.12	1.09
Carbon disulfide	CS2	76.14	1.21
Carbon dioxide	CO2	44.01	1.29
Carbon monoxide	CO	28.01	1.40
Chlorine	Cl2	70.91	1.36
Cyclohexane	C6H12	84.16	1.09
n-Decane	n-C10H22	142.29	1.03
Ethane	C2H6	30.07	1.19
Ethyl alcohol	C2H5OH or C2H6O	46.07
Ethylene	C2H4	28.05	1.24
Helium	He	4.00	1.66
n-Heptane	n-CH3(CH2)5CH3 or C7H16	100.21	1.05
n-Hexane	n-C6H14	86.18	1.06
Anhydrous Hydrogen chloride (Hydrogen chloride)	HCl	36.46	1.41
Hydrogen	H2	2.02	1.41
Hydrogen sulfide	H2S	34.08	1.32
Dichlorodifluoromethane (R12)	CCl2F2	120.91	1.139
Methane	CH4	16.04	1.31
Methanol	CH3OH or CH4O	32.04	1.20
Methyl chloride	CH3Cl	50.49	1.20
Nitrogen	N2	28.01	1.40
Nitrous oxide	N2O	44.01	1.30
n-Nonane	n-CH3(CH2)7CH3 or C9H20	128.26	1.04
Oxygen	O2	32.00	1.40
n-Pentane	n-CH3(CH2)3CH3 or C5H12	72.15	1.07
n-Propane	n-CH3CH2CH3 or C3H8	44.10	1.13
Water vapor (pure)	H2O	18.02	1.133
Sulfur dioxide	SO2 or O2S	64.06	1.29
Toluene	C6H5CH3 or C7H8	92.15	1.09
Propylene	CH3CHCH2 or C3H6	42.08	1.15
Octane	CH3(CH2)6CH3 or C8H18	114.00	1.05