compressor sizing
compressor sizing
(OP)
I posted this in the pipes forum and they directed me here..
It I have a compressed air continuous plant demand of 15,000 scfm at 30 psig, can I serve this with an IR compressor rated for 3,000 cfm free air delivery at 150 psig with a pressure regulator to 30 psig? I am confused as to what the free air delivery is? Does this mean it can supply 3,000 cfm at 150 psi which would be 15,000 cfm at 30 psig? I used the equation P1V1=P2V2. My location is pretty much at standard conditions. Thanks in advance.
It I have a compressed air continuous plant demand of 15,000 scfm at 30 psig, can I serve this with an IR compressor rated for 3,000 cfm free air delivery at 150 psig with a pressure regulator to 30 psig? I am confused as to what the free air delivery is? Does this mean it can supply 3,000 cfm at 150 psi which would be 15,000 cfm at 30 psig? I used the equation P1V1=P2V2. My location is pretty much at standard conditions. Thanks in advance.





RE: compressor sizing
Good luck,
Latexman
RE: compressor sizing
Good luck,
Latexman
RE: compressor sizing
RE: compressor sizing
Good luck,
Latexman
RE: compressor sizing
If you're still uncertain, here's what I would do. I bet the vendor's literature includes a phone number or e-mail address.
Use it, and tell them that their marketing department has made confusing literature that may cost them a sale. Tell them you need an engineer calculate for much air will be available on the 30 psig side of a regulator, and you need it quickly.
The engineers LOVE hearing that stuff, and they might even offer to design the rest of your system for you at no charge. You'll forever have a technical support friend, at the very least.
Good on ya,
Goober Dave
Haven't see the forum policies? Do so now: Forum Policies
RE: compressor sizing
15000 scfm at 30 psig is 'about' 5000 actual cfm. Your compressor isn't going to do it if it's only compressing 3000 cfm at atmospheric pressure.
RE: compressor sizing
RE: compressor sizing
I have not seen you on ET since about 2009. Big project over? Welcome back!
Good luck,
Latexman
RE: compressor sizing
RE: compressor sizing
Good luck,
Latexman
RE: compressor sizing
I'm confused now
Hi Latexman
RE: compressor sizing
Good luck,
Latexman
RE: compressor sizing
This interesting and practical topic is in capable hands if it receives comments and recommendations from the likes of Latexman and TD2K.
It could really heat up if we could get David's (zdas04) to pitch in with his valued views and recommendations.
As Latex said, WELCOME BACK TO THE FORUMS TD2K .
RE: compressor sizing
"psi" without a qualifier is simply lazy and it has no meaning. In school in means "psia". In some people's mind in industry, "of course it is psig". It is horrible.
I have the same problem with Bar and kPa. I often get grief for writing bar(a), but I don't care. When I was an undergraduate no one would ever consider reporting "bar" as other than referenced to absolute zero, today bar(g) is almost more common that bar(a) even though it is difficult to get agreement on how to convert (it used to be that zero bar was absolute zero, and atmospheric pressure usually occured at 0.8-0.95 bar, now absolute zero is -0.8 to -0.95 bar(g)).
Latexman,
You must not work much with contracts. Before I retired I had 4 contracts that I had to live under and every damn one of them had a different "standard". "Standard" is absolutely whatever two parties agree it is.
David
RE: compressor sizing
I recently finished up a job where the client handed us their design basis memorandum. I asked whether a concentration they had provided was ppmv or ppmw. Talk about deer in the headlight look from them. How do you expect someone to provide you a design when you don't really know what you are asking them to provide?
I also use bar(a). Maybe people don't like it but they can't claim they don't know what I mean.
RE: compressor sizing
Thank you David!
That's music to my ears....
RE: compressor sizing
David