primary, secondary, tertiary Ex – one replaces the other one?

Primary Ex is about prevention.
Secondary Ex is about protection.
Tertiary Ex is about follow up action, how to mitigate the consequences of possible explosion.

10 Steps to Coordinate Remote Teams

just received the question: if there is a well engineered gas sensoric and ventillation system, is there any need for tertiary Ex? is it a good question? what about secondary? what about any management issues to co-ordinate explosion protection on site?

is one of them simply enough?

my answer: No. in all cases all 3 shall be considered, but maybe not applied. it depends on many factors: 1) Ex personnel competency (understanding of epxlosion protection) 2) HAC (hazardous area classification) 3) …

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Keep up good work!


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