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Fuel Gas Purge Fow Rate

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wiseguy007

Chemical
Dec 1, 2012
2
Hi Guys,

Does anyone know how to calculate the fuel gas purge flow rate required for a horizontal cold vent open to atmosphere?

So far the only information i can find is realted to vertical flare stacks (API 521). Can these formulae be applied for my case as well? If not, how can i proceed with the calculation?

Thanks.
 
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I assume that this is not continuous purge. I assume that this is start up or maintenance purge. In any event, if the purge is continuous you could use the correlations in API 521 but I cannot envisage a scenario where one would continuously vent fuel gas to atmosphere without at least flaring it.
 
This is a case of continuous purge. Gas is routed from the production header to vent header where there is a knock out drum.
 
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