Compressor suction drum/knockout

Compressor suction drum/knockout pot Because compressors require dry gas that is free of foreign... 

A PR valve is not required for protection against fire on any vessel which normally contains little or no liquid, since failure of the shell from overheating would occur even if a PR valve where provided. Examples are fuel gas knockout drums and compressor suction knockout drums. (Note Some local codes require pressure relief valve protection for "dry drum" situations.)... 

Liquid loads are considered from all safety valves that discharge as a result of a single contingency, plus in each case an allowance for knockout drum liquids (fuel gas knockout drums, absorber overhead knockout drums, and compressor suction and interstage knockout drums) equal to the inventory of all drums which discharge to the blowdown drum, at their LHA point. 

A gas stream having the composition given in Table 6.2.1 flows into a compressor suction. Size the knockout drum to prevent liquid from entering the compressor. The gas enters the drum at 105 °F (40.6 °C) and 150 psig (10.3 bar). 

Efficiencies of 95% for collection of 5 m droplets can be achieved by proper design of cyclone separators. For applications such as knockout drums on the suction of compressors, however, it is sufficient to remove only droplets greater than 40-50 m. 

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