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27-04-2003, 07:46 PM #1
pressure drop of pump return line ammonia
Hey,
I am searching for a formula to calculate the pressure drop of the pump return line (wet gas recírc. 2-5) of ammonia.
In practice the pump return line will be mostly one diameter bigger than the gas line but I need to calculate the pressure drop. Because the pipelength are more then 100 m (328 ft) and there is a suction mainvalve. To prevent high pressure drop over 2 K a calculation have to be.
Could you help?
Thanks
O. Möller
Olav Möller
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27-04-2003, 09:20 PM #2
Hi Moeller,
I use the Dircal program available from the Danfoss site for free.http://Danfoss.com
Search about and you will find this under there Industrial Refrigeration section.
Any problems locating Dircal, post back and I will go look for the exact link.
Kind Regards. Andy
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28-04-2003, 09:56 AM #3
Hi Andy,
thanks, this program I use too. But I want to make my own program (Excel sheet to have a better overview of the results and for better documentation). But I do not believe the calculated pressure loss of the Dircalc-program always and I want to know the calculation base. I asked Danfoss, which base formula they take. Up to now I am waiting for answer.
O. MöllerOlav Möller
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28-04-2003, 07:30 PM #4
Hi Moeller,
in discussions with a danfoss representative, I was informed that there maybe a problem with sum suction lines wet/dry calculated on Dircal below -30 deg C. I might be able to send you a chart on excel to calculate the pipe sizes. I will see if I can make this available to you and I will post back.
Kind Regards Andy
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28-04-2003, 08:41 PM #5
Hi Andy,
this would be great.
Thanks.
O. MöllerOlav Möller
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04-09-2007, 05:21 AM #6
Re: pressure drop of pump return line ammonia
Hi Andy & Moeller, can you post info, Iwould be keen to see spread sheet, as I use Dircal as well.
regards Magoo
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