Re: compressor piping

From: <George>
Date: Mon Sep 15 2003 - 07:38:00 EDT

Vikas
I have worked with compressors for some time, and definitely do NOT recommend you support compressor piping from the same points as compressor. I have a little trouble following your note, in reference to compressor support columns - is this compressor mounted on a platform? Normally, onshore, we would have the compressor (or compressor skid) mounted on a concrete block. Then, the compressor discharge bottles would be supported by a series of adjustable wedges, one under each compressor nozzle. The discharge line would then run (preferably through a couple of 90 ells to give some flexibility) to a support block, independent of the compressor block. Suction piping is similar, with the suction pulsation bottle normally elevated above the cylinders, and a riser line or lines, again with 90 degree ells preferred.

On the compressor and piping moving together, be careful about this. The compressor cylinders will "stretch" with each stroke, giving a horizontal displacement to the nozzle and bottle. If you have two or more cylinders tied to the same bottle, this will result in a net rotational movement of the bottle(s). The compressor frame and foundation will move in line with the sum of acting forces, not necessarily in phase with the motion of the bottle. Sum total of all this is, make your compressor block as massive and rigid as possible, but the supports for bottles and piping should allow for some movement. Otherwise, relative movements of the compressor and cylinders will set up stress in the piping.

Hope this helps, if you have more details, write back.

George McKinney
----- Original Message -----

   From: vikas
   To: <a href="/group/PipingDesign/post?postID=hd58aM9wLT7Y2KXaz06-6Fh6EqDjkAsENnIEZ7J2-HrIhccJPnk7nDz97xUP3G444vyzNVYfrZTZeKO11jOAMjC-4cVGxco">PipingDesign@yahoogroups.com</a>    Sent: Monday, September 15, 2003 3:07 AM    Subject: [PipingDesign] compressor piping

   is it advisable to take pipe support for compressor inlet n outlet lines    from the compressor support columns? it is advised that support shall not be    taken from the columns as they will be vibrating along with the machine    hence the vibration will pass on to the nozzles. my opinion is that since    both machine n structural column and the support are subjected to same    vibrations hence there should not be any adverse effect on the nozzles.    i would like ur valuable opinion on this    regards
   vikas

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[Non-text portions of this message have been removed] Received on Mon Sep 15 07:38:00 2003