South Australian Current Regulations

GAS REGULATIONS 2012 - SCHEDULE 1

Schedule 1—Flame speed factor and sooting index

(regulation 3)

Part 1—Flame speed factor

*The flame speed factor ( S ) of a gas is given by—

where—

F = flame speed coefficient for each combustible component according to the table in Part 3

m = mole fraction of combustible component that has a flame speed coefficient F _m

A = air requirement for each combustible gas component according to the table in Part 3

n = mole fraction of combustible component that has an Air requirement of A _n according to the table in Part 3

Z = the total mole fraction of inert gases (eg CO ₂ , N ₂ )

Q = the mole fraction of oxygen present.

Note—

1         Based on Gilbert, M.G. and Prigg, J.A., Gas Council Research Communication GC35 (see Transactions of the Institution of Gas Engineers 1956/57 ).

Part 2—Sooting index

*The sooting index ( I ) of a gas is given by—

where—

B = the sooting coefficient for each combustible component according to the table in Part 3

a = the volume per cent of component that has a sooting coefficient of B _a

H ₂ = the volume per cent of hydrogen in the gas

CO = the volume per cent of carbon monoxide in the gas

O ₂ = the volume per cent of oxygen in the gas

d = the relative density of the gas.

Note—

1         Based on Schneck, H. and Delbourg, P., Journal des Industries du Gaz , December, 1962.

Part 3—Table

Combustible Gas Component	Flame Speed Coefficient F	Air Requirement A	Sooting Coefficient B
carbon monoxide	61	2.39	—
hydrogen	339	2.39	—
methane	148	9.55	1.0
ethane	301	16.71	2.0
propane	398	23.87	3.6
butane	513	31.03	4.7
pentane	610	38.00	6.0
hexane	710	45.00	10
heptane	800	52.00	13
octane	880	59.00	17
ethylene	454	14.32	2.8
propylene	674	21.48	6.0
butylene	890	28.64	7.0