air vessel cfm value
air vessel cfm value
(OP)
Hi Guys, My boss wants me to find a CFM value for a vessel we're building a test stand out of. the capacity of the vessel is approximately 75 cu.ft. with a 1" npt outlet. we want the CFM value at 1500 psi. is there a somewhat simple calculation I can use with just this info or do I need some more data to calculate CFM?
Thanks Fellas
Thanks Fellas





RE: air vessel cfm value
Now if you had a velocity limit inside the vessel or through the inlet/outlet nozzles, then a capacity could be calculated, but it would be more appropriate to state it at SCFM (using an explicit definition of standard temperature and pressure).
David Simpson, PE
MuleShoe Engineering
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RE: air vessel cfm value
Is the tank re-filled at the same rate or does it deplete over time?
What is the outlet pressure downstream of the tank?. Anything less than about 700 psig will result in choked flow at your rather small 1" nozzle, plus a LOT of noise.
What is the air feeding? Normally this question is the other way around, i.e. you now how much air you need / require and then design / check your system around it.
As zdas04 says, what conditions do you want you CFM in? - Standard (60F, 1 atm) or at your usage conditions, whatever these are.
currently what you're asking is like saying, I have a tank of fuel. what MPG will I get from it, without knowing the size of engine, power, etc
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: air vessel cfm value
Thanks for the quick responses guys.
RE: air vessel cfm value
You now want to vent this 1500 psig steam via a 6 inch long 1" pipe into an enclosed space straight to atmosphere(!!)
Given that this seems to be unbeleiveably dangerous I'm not going to even try and calcualte this other than to say you will hit choked (sonic) velocity and the steam will expand to a ridiculous degree and you'll burn or kill everyone in the shop, or deafen them at the very least.
When you think about this a bit more and then come back with some more sensible way of doing it you might get a more reasoned response.
Sorry if this isn't the answer you're looking for but the scenario laid out, in my opinion, is so dangerous that it should not be being considered, far less calcualted.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: air vessel cfm value
RE: air vessel cfm value
This is a steam question and I haven't looked at that since university - a looong time ago - so even if I wanted to I can't give you answer. Sorry.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: air vessel cfm value