Gas group as per IP 15 hazardous area classification
Gas group as per IP 15 hazardous area classification
(OP)
thread238-103548: Gas Groups for Flammable Gases and Vapours
Dear all,
Can you please clarify me on the following on hazardous area classification :
1) I have a gas mixture with 90% methane and other hydrocarbons for the balance of % and a small portion of hydrogen sulphide.
If it is pure methane I can classify as gas group iia. However, as per ip 15, when there is a mixture, the most onerous one is to be considered for subgroup.
Please clarify if I should use II B classification instead of II A.
With best regards,
Vijay
Dear all,
Can you please clarify me on the following on hazardous area classification :
1) I have a gas mixture with 90% methane and other hydrocarbons for the balance of % and a small portion of hydrogen sulphide.
If it is pure methane I can classify as gas group iia. However, as per ip 15, when there is a mixture, the most onerous one is to be considered for subgroup.
Please clarify if I should use II B classification instead of II A.
With best regards,
Vijay






RE: Gas group as per IP 15 hazardous area classification
It depends on what those other hydrocarbons are, and what concentrations. We can't tell from here. Get a good assay and decide which mixture will be the first to explode in the presence of an ignition source as air is added to your mixture. Then decide which will be first to explode in the presence of an ignition source as your mixture is added to pure air. Some engineering judgement will be required to decide if either case is unlikely enough to warrant exclusion.
If it's common utility natural gas that comes in the pipeline to my house here in Georgia (US), it's group IIA. The heavy things have been scrubbed to the greatest extent economically possible.
Best to you,
Goober Dave
Haven't see the forum policies? Do so now: Forum Policies
RE: Gas group as per IP 15 hazardous area classification