Compressed air holding time
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Posted by: pmcheng ®

08/23/2006, 06:40:29
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Dear all,

Currently, I am looking into a system for compressed air system. I am running into trouble for the calculation of air holding time.
Hope that any of you guys can help me here.

I have 3 units of compressor running at 3400Nm3/hr each.
The pressure of the compressor is 9.5 bar.
The general flowrate required is 10,800Nm3/hr.
Minimal air required during emergency is 2,000Nm3/hr.
I have a receiver tank of 20m3 (water volume).

When there is a power failure, it will take 40sec for the compressor to start up and supply from emergency power.
During this situation, the supply will be only restricted to minimal air requirement (2000 Nm3/hr).
I need to calculate the holding time if the volume in the receiver tank is sufficient to hold more than 40sec.

Can anyone help me?

Best regards
PINGMUN








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Re: Compressed air holding time
Re: Compressed air holding time -- pmcheng Post Reply Top of thread Forum
Posted by: zekeman ®

08/28/2006, 10:05:31
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What's a Nm3, an m3 at ibar?
If so, you take the 20m3 and multiply by 9.5 to get the volume at 1 bar and therefore the depletion time is
20*9.5/2000*3600seconds=342 seconds
which is much greater than your required 40sec. So I say you are OK if my assumumption is right.







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