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Gas explosion question

Stephen Biddle
Hi All


I've just had a gas explosion in an enclosure and I'm trying to remember my basic COMPEX stuff.  The enclosure is Ex e.  I must have had an explosive mixture and a source of ingnition.  I am trying to find the cause of both, but there's not much left of it to study.  Am I right in thinking that there should not normally be an explosive mixture in an Ex e box ie this is a rare event?  If so is the presence of gas in itself a fault to be rectified?


Stephen
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    Hi For all those who read this question, you might be interested in the answer I found.


    An Ex e enclosure is used in Zones 1 and 2 where explosive gas is unlikeley.  In this case a gas leak had occured, which made the explosive mixture permanent and when an electrical fault occured it ignited.  I inspected a similar enclosure and found the same gas, so shut this one down.  I will now make a regular inspection with a gas detector for all similar installations.


    Note that for a location where gas is likeley and a source of ignition is present and Ex d enclosure should be used.


    Stephen
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  • 0
    Hi For all those who read this question, you might be interested in the answer I found.


    An Ex e enclosure is used in Zones 1 and 2 where explosive gas is unlikeley.  In this case a gas leak had occured, which made the explosive mixture permanent and when an electrical fault occured it ignited.  I inspected a similar enclosure and found the same gas, so shut this one down.  I will now make a regular inspection with a gas detector for all similar installations.


    Note that for a location where gas is likeley and a source of ignition is present and Ex d enclosure should be used.


    Stephen
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