Gas Group Acetylene in a mixture 1

[AC.l]

Hi,

I have a mixed gas containing amongst others Hydrogen, acetylene and methane.

Gas would be group IIB if it weren't for the hydrogen and acetylene.

Hydrogen is low, below 30% vol and inline with IEC 60079-10-1 2020 page 103 annex H.1 the gas doesn't come under the IIC classification from the hydrogen perspective.


I am sure from seeing this elsewhere in a previous application that a similar rule is available for acetylene below (I think) 14% vol which our gas is, however I can't find the reference to support this.

Please can anybody help me with a reference to support that a mixed gas below ~14% vol acetylene doesn't have to be a IIC classification.

I would note that the sum of acetylene and hydrogen by volume is also less than the 30% hydrogen limit so no concerns with considering acetylene to be a "hydrogen like" gas.

I am aware there are a great many sources with the blanket statement "gas group IIC for acetylene/ hydrogen" - as proved in the hydrogen case this is nuanced for low levels in a mixed gas so would appreciate if we could look beyond this to my specific case.

Thanks for your assistance.

 

[hacksaw]

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