[Wilson]

Thanks for such a quick reply.

I understand its not going to be a simple PSI to CFM conversion. However there must be a point where these PSI and CFM meet. Example: PSI to HP then convert HP to CFM.

No we don't know the HP we need, nor the PSI. That’s my dilemma.
By estimated figures we need to be able to suck about 6-11Ft³.
This is not a set in stone figure. The container is in the open environment (pollen, humidity, etc.)(Size of container: 40ftx8.5ftx8ft), and need the formula to figure out the PSI we need within the tubing and that would help us to gain the Hp needed to acquire that PSI or vise-versa.

I'm not the air flow expert in this matter; I came across this site by chance and in hopes that someone may be able to answer this question for me. But I will get one of my other guys to get on this site first thing in the morning and have him take a look and reply back with his knowledge of what is needed. He maybe able to word this better then me, so that you would be able to gain a better understanding of what it is I am asking for.

Thanks
-Wilson

Edit: The inlet/outlet of the motor is which ever works, the size so long it’s not a huge motor. We have been working with 1/4in, 1/2in, 3/4in, and 1'in. Pressure in all cases seems to hold from start to finish in about 30 ft worth of tubing. We are also looking for just one consistent CFM rating all the way threw; we are not trying to change it at any given point. Valves are a problem we are also dealing with losing about 2 PSI per valve.