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Unfortunately, there is no way of avoiding the flammable / explosive gas mix forming possibility when venting a flammable gas to atmosphere. I have watched lots of discussions around the subject, because some people always come saying that the probability of a flame ball or explosion occurence...

Dear friend: Some basic concepts, I have been using and seen into practice in many natural gas pipeline installations: 1 - For NG vent systems, always consider ignition as a possibility. Therefore, flame radiation calculations (as per API) is a must. Gas dispersion study, for given stack...

The gases from a vent stack may ignite, by lightning, by static electricity or by contacting any ignition source. This may typically happen some 30 seconds or more after the blow down process is initiated. That's because initially the velocity is too high and dispersion has not taken place in...

API RP 521 has some very useful recommendations, which are of widespread use for engineering design of vent stacks, from pressure drop calculations on vent gas lines to vent stack tip design taking into account the minimum velocity for gas dispersion. Radiation also must be taken into account...

I agree with those that won't use this type of compressors for high pressures, or for demanding applications requiring a API compressor, unless the decision to go with it is backed by a good number of cases of sucessfull experience in the same conditions. And when evaluating such thing as "same...