Re: Compressed Natural Gas Cooler

From: <George>
Date: Thu Jul 21 2005 - 11:33:00 EDT

Elie:
Some comments on your question about natural gas cooling: If I understand what you are saying, you would like to add a gas to water aftercooler downstream of the existing fin-fan compressor coolers, using your available produced water as the cooling medium. If so, there should be a good number of available manufacturers for this type of exchanger. GEA is one company that comes to mind, but if you search the web for "shell and tube heat exchangers" you will get a number of sources. Or, check Compressor Tech2 - Compression Technology Sourcing Supplement - would probably give you a number of sources.

Comments:
First of all, why are your aftercoolers undersized - were they properly sized, what is your ambient air temperature, has compressor suction/discharge changed increasing discharge temperature, are coolers needing cleaning? Generally, determine if you really need the new cooler. Second, what is the BTU/hr load of the gas that you are rejecting - it is going to go to your water, and then what? What will be the temperature of the effluent water? Do you have a discharge that will not be affected by the increased temperature of the water?
And, what is the content of your produced water? Is it really just water, or does it have salt and pipeline liquids? Will it foul the cooler when you go circulating?

It sounds like you have a reasonable approach, but a number of details need resolved.

George McKinney

• Original Message -----
  From: elie altawil
  To: <a href="/group/PipingDesign/post?postID=r8MvxWu-mS7hiyKtrW9dN5owXPSvGl9f_VLzM2h3ynEK3O_UqxyFvii9O_qEwZjlcqxX0copvC8Als2VWIoOnum1">PipingDesign@yahoogroups.com</a>
  Sent: Thursday, July 21, 2005 10:07 AM
  Subject: Re: [PipingDesign] Compressed Natural Gas Cooler
  

The Problem:

This plant has 4 recip compressor units and 4 TEG dehydration units. The
finfan coolers on the compressors are undersized and the gas outlet temperature from the finfans exceeds the dehy unit design inlet gas temperature of 100 deg F, resulting in gas to the pipeline with >7 lb/mmscf water content. On site we have available >2500 bbl/day of produced water at 70 deg F. Plant normal output is 60 MM @ 400 psig.

We are looking at several option, one of which is installing a gas cooler with
water pumps instead of fans, all what we need .

The Request

1. Anyone implemented this approach successfully?
2. We are looking at decreasing the gas temp from 120 deg F to 95 deg. F?
3. I am looking for a ASME Certified design/fabricator in the USA only?

Thank a lot. ET.

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[Non-text portions of this message have been removed] Received on Thu Jul 21 11:33:00 2005