Vessel Sizing Question
Vessel Sizing Question
(OP)
I would appreciate any help I could get on a problem I am having at work. Thanks in advance!
I have a system that I am designing a test chamber for. We have a customer requirement that states the maximum rate of pressure change the system needs to be able to be subjected to during testing is 0.01 psi/sec and I have a pump that I know has a minimum pumping speed of 100 l/min to a maxiumum of 400 l/min. How would I size the interior volume of my chamber to know that I am capable of achieving the pressure change requirement? Thanks!
I have a system that I am designing a test chamber for. We have a customer requirement that states the maximum rate of pressure change the system needs to be able to be subjected to during testing is 0.01 psi/sec and I have a pump that I know has a minimum pumping speed of 100 l/min to a maxiumum of 400 l/min. How would I size the interior volume of my chamber to know that I am capable of achieving the pressure change requirement? Thanks!





RE: Vessel Sizing Question
From that experiment you can infer that, if you did that in 1 second, it would be a change of air volume of 5.0034 - 5 liters = 0.0034 liters in that 1 second.
Problem is that 0.0034 l/s air flow will only change the pressure by 0.01 psi, if the bottle is about 5 liters in size. If the bottle is a different size, say bigger than 5 liters, then that flow rate won't change the pressure by that much. Do the problem again, but instead of using 5 liters, use the volume of the container that you have to fill. You will find that you will need 2 x the flow rate to change the pressure by the same 0.01 psi/s, if your container has a 10 Liter volume.
Neglecting air compressibility of course, which you can do at low pressures like that example.
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RE: Vessel Sizing Question
The pressure rise is very low, 0.6 psi /min. If it's air, what pressure is your "pump" flow at?
If it's liquid system without any air gap, you would need a huge volume at 100l/sec to make this sort of pressure rise.
Give us a but more info and you might get a more specific response. It's all very vague at the moment.
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RE: Vessel Sizing Question
RE: Vessel Sizing Question
Is your pump pulling 100 liter/min or 400 liter/min?
How is that rate controlled?
RE: Vessel Sizing Question