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Rupture risk due to deflagration (low pressure vessel)

Rupture risk due to deflagration (low pressure vessel)

Rupture risk due to deflagration (low pressure vessel)

(OP)
API 521, Section 7.3.2.4 recommends that a minimum design pressure of 3.5 barg be selected for knockout drums in subsonic flares to avoid rupture if a deflagration occurs.

I have a 1.5 barg design P vessel connected to flare. It is a hydrocarbon containing vessel but not the flare drum itself (only vented to flare).

Would the risk of deflagration be considered lower if I routed the vent from the vessel to an atmospheric vent with a flame arrestor? A new vessel is not an option.

Thanks.

RE: Rupture risk due to deflagration (low pressure vessel)

normally vent stack sizing is smaller than flare stack, there is another risk if a your area is categorized as a lighning area will be another risk if you dispose a combustible gas since it would be uncontrolable
I doubt if deflag occur in internal system,if worried on external fire,around yr KO drum should be equipped by fire water deluge & spray system

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