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Thread: Ammonia basics
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27-02-2014, 11:11 AM #2
Re: Ammonia basics
Venting a compressor depends on local laws, you can vent to air, in water,or use transfer unit. Some plants may have compressors running at lower pressure or vacuum. You could connect a suitable hose to transfer to the lower pressure.
If you do a lot of it, a transfer unit is not a waste of money.
Draining a surge drum by gravity can only happen if where you are draining to is equal or lower pressure, possible but unlikely.
Usually first close liquid make up to surge drum, then limit compressor capacity & very slowly reduce pressure, also restrict compressor suction stop valve.
If you have a suction trap or slop pot you may no need to restrict suction on compressor, but definitely find out reason for it, like leaking LLSV etc.
Oil does not return, you have to drain it from all low points at regular intervals like monthly etc