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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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  • 0
    Legh,

    What you have just described is an Ex d enclosure where the enclosure can 'breathe' through the flame path gap. If there is ignition the flame passes and cools through the flame path such that when it reaches the outside atmosphere the temperature is insufficient to ignite the surrounding vapour/gas. If I had an Ex p enclosure (pressurised) I wouldn't expect it to allow gases to enter the enclosure, nor with Ex m (encapsulated) or Ex o (oil filled) protection arrangements.

    Alasdair
Reply
  • 0
    Legh,

    What you have just described is an Ex d enclosure where the enclosure can 'breathe' through the flame path gap. If there is ignition the flame passes and cools through the flame path such that when it reaches the outside atmosphere the temperature is insufficient to ignite the surrounding vapour/gas. If I had an Ex p enclosure (pressurised) I wouldn't expect it to allow gases to enter the enclosure, nor with Ex m (encapsulated) or Ex o (oil filled) protection arrangements.

    Alasdair
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