We have installed a new compressor for nitrogen service which is designed and built as per standard API 618. The nitrogen which is being compressed is highly dry and dew point is around -100 deg C whixh makes it bone dry gas. Now, supplier is putting up a restriction not to use the highly dried nitrogen having dew point less than -60 deg c. To my knowledge, higher value of dew point of the gas being compressed is a concern for the compressor as liquid droplets can damage the compressor parts, but how come higher degree of dryness is dangerous for the conpressor. Is this the case for non lubricated pistions only or applicable to lubricated pistons also.
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API compressor for bone dry gas
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Speculation only, but I wonder if this is just careless use of language.
I hear people say "less than -60 C" when they mean "on the side of -60 C which is nearer to zero" almost as often as I hear the term used rationally.
I think this happens because we generally think of dewpoint as a measure of dryness rather than wetness, so the numbers only go in the "right" direction if you ignore the sign - after which it's really anyone's guess what some people mean when they say "less".
A.
I hear people say "less than -60 C" when they mean "on the side of -60 C which is nearer to zero" almost as often as I hear the term used rationally.
I think this happens because we generally think of dewpoint as a measure of dryness rather than wetness, so the numbers only go in the "right" direction if you ignore the sign - after which it's really anyone's guess what some people mean when they say "less".
A.
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