Gas group and temperature rating of Hydrocarbon

[kimseunghee]

I'd like to select electrical equipment to be installed in area where "hydrocarbon" exists. I have no idea which gas group and temperature rating it belongs to.
Anybody helps me out ?

 

[itsmoked]

You need to say what hydrocarbons or what kind of facility and where.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[Aimn]

I hope you can find the answer here in the attachment link

Aimn

 

[kimseunghee]

The electrical equipment is to be installed in drillship. I can't find hydrocarbon on list and I don't know whether it belongs to IIB or IIC and Temerature rating.

 

[waross]

A hydro-carbon is a member of a family of compounds consisting of a combination of hydrogen and carbon atoms.
Tar is a hydro-carbon.
Lubricating oil is a hydro-carbon.
Diesel fuel is a hydro-carbon.
Gasoline is a hydro-carbon.
The term "hydro-carbon" is often used in the petroleum industry to refer to a mixture of products, or to a hydro-carbon based liquid of unknown or uncertain composition.



Bill
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"Why not the best?"
Jimmy Carter

 

[itsmoked]

And as waross explains you can well imagine tar would have different requirements from gasoline or acetylene.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[ScottyUK]

In such an uncertain operating environment you will need to design for the worst case if the client can't tell you the gas composition or you can't determine it for them: gas Group C, temp class T6 in Europe. This will in all probability be overkill and lead to an unnecessarily expensive solution, so it is worth determining what the actual environment is.

You will also need the likely duration of when a hazardous gas will be present in order to determine whether it is a zone 0, 1, or 2. This can be calculated from the nature of the equipment and its operating conditions.

If you assume worst case for everything you will end up with a very restrictive design spec which will only allow intrinsically safe 'ia' design. In most cases this will be completely unacceptable, which brings up my earlier point: find out what you are designing for. You don't have enough information at present.


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