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Thread: ammonia liquid
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15-05-2007, 02:37 AM #1
ammonia liquid
Hello guys
How r u?
I have question for the ammonia liquid with low temp. and pumping with the ammonia pump. It is possible if the velocity of liquid ammonia with low temp we increase will be build up the gas?
many thanks
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15-05-2007, 02:43 AM #2
Re: ammonia liquid
When you pump liquid ammonia the pressure increase generates subcooling. You can see this on a pressure-enthalpy diagram.
The extent of pressure increase created by the pump means you can increase the friciton losses or static head losses equal to the pressure added by the pump, before the liquid will flash off into a vapor.If all else fails, ask for help.
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15-05-2007, 08:21 AM #3
Re: ammonia liquid
Now I have a problem with ammonia liquid pump is sometimes cavitation (at low pressure receiver -40degC). I have check the pump is over capacity so they have make adjusment and decrease the pipe suction and discharge sizing. My suspect is if they make sizing down for that pipe the velocity become increase and flash in to the vapor like u said, its correct?
thanks for your help
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15-05-2007, 09:58 AM #4
Re: ammonia liquid
Dear US Iceman,
By any chance can you put up the PH diagram for this pump pressure increase & the Superheat increase point.
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15-05-2007, 10:24 AM #5
Re: ammonia liquid
Smpsmap, this is a normal log/p for NH3 where you have to plot the real cycle on it.
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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15-05-2007, 02:50 PM #6
Re: ammonia liquid
Originally Posted by faryuki
If the pump is trying to pump too much liquid, the NPSHR (net positive suciton head required by the pump) can increase dramatically, which causes the pump to cavitate.
That's only one possible explanation. but it is the most likely.If all else fails, ask for help.
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