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Thread: Air purger
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28-03-2011, 07:47 AM #1
Air purger
Hi,
I want to ask you if you think is absolutely necessary an automatic air purger for an ammonia plant running -30/ + 35. At -30 C the pressure is around 1.2 bar, so no risk of air entering in the instalation.
I think is no need for this air purger.
What do you think?
Thanks.
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28-03-2011, 11:52 AM #2
Re: Air purger
It depends on how much do you want / could spend.
Probably sometimes you will run at -35ºC, no? Or during some service always some air enter.
However I confess that I wouldn't put it unless the Client wants it.To make progress is never good enough, I want to do better and better and better
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29-03-2011, 04:31 AM #3
Re: Air purger
Hi.
your suction at 1.2 bar absolute is a bees **** above zero. So seriously concider an auto purger to keep system clean and tidy. Or else do a high side purge six monthly.
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29-03-2011, 07:01 PM #4
Re: Air purger
Hi, Romanicus
No need for automatic purger (it will be better to have it, less headache regarding purging), but for sure you need to provide valves for proper manual purging from time to time ...
One question, of course if you want to share that info with us ... which compressors you have installed, condenser/s etc.. ..... assume it is single stage plant ....
Best regards, JosipLast edited by Josip; 29-03-2011 at 07:03 PM. Reason: add some text
It's impossible to make anything foolproof because fools are so ingenious...
Don't ever underestimate the power of stupid people when they are in large groups.
Please, don't teach me how to be stupid....
No job is as important as to jeopardize the safety of you or those that you work with.
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30-03-2011, 04:47 AM #5
Re: Air purger
Hi again, and thanks for the responses.
No compressors yet installed.
It's a tender book. I will go with 2 screws with economizer, VSD driven each, pumped ammonia, all evaporators with hot gas defrost, evaporative condenser.
It's a logistic center. In the tender it's specified that you must have this automatic air purger, but i'm afraid that my competition will not offer it. I will offer it, because the tender asks for that, but i want to discuss with the client and maybe he will agree not to have it (if he pushes me with the price down)
It's a one stage plant. I agree with you that it's nice to have an automatic air purger, but it costs quite a lot.
For sure, if the client agrees not to have this automatic air purger i will install manual purging system.
For Sandro: In normal operation is not possible to run at -35C. All the rooms are -20C rooms. BUT, the client might want to store ice cream or something like that, in this case, yes, it's possible to run at a lower suction temperature. But again, the tender specifies -28 evap, -20 air inlet in the evaporator.
Till now the score is 3-1 against the automatic air purger
All the best,
Andrei
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30-03-2011, 08:59 AM #6
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30-03-2011, 12:08 PM #7
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30-03-2011, 01:58 PM #8
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30-03-2011, 08:39 PM #9
Re: Air purger
Thank you gentlemen. In the tender the air purger has a separate price, and so it will have in my offer. Thanks for the nice advices. Tommorow I have to issue the offer so keep the fingers cross for me
Have a wonderful evening.
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30-03-2011, 11:34 PM #10
Re: Air purger
Hope you can do the business unless you are from my competitor . Surely not my company only operate in Portugal.
All the bestTo make progress is never good enough, I want to do better and better and better