×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Pump up equation?

Pump up equation?

Pump up equation?

(OP)
I am trying to determine how long it would take to pump air into an open bottomed barrel(100 cubic feet) in a tank of water 230 feet deep. (Say a silo)
I know that the psi at that depth is approx 100 psi.
The pump will be located below the tank so there will be minimal amount of hose needed.
I have a 25hp pump pushing 100 CFPM.
How do I calculate this???
any help would be greatly appreciated.

RE: Pump up equation?

Answer depends on what pressure the pump operates at. If less than 100psi, you can never fill the barrel. Of course you must have just over 100psi, otherwise the air would never have enough pressure to overcome the water pressure. Now assuming you have just enough pressure, with a 100cfpm pump it would theoretically take 1 minute to fill a 100 cubic foot barrel. If you have a higher pressure output it would take less time, in which case you should be able to use the perfect gas law to figure(P1*V1/T1=P2*V2/T2. Do you know what pressure out put of pump is? If pump pressure output was 200psi, then its equivalent volume in the barrrel would be twice that in the pipe. Effectively you could fill the barrel in half the time. This is all theorectical and there will some friction losses, but it should get you in the ball park. How close do you need? Answer would be: Time= Volume of barrel/(CFM of Pump * Pressure OutPut of Pump/Pressure in barrel).

RE: Pump up equation?

(OP)
Thank you very much.  That answers my question completely.
I even went so far as to contact a few air pump manufacturers and was told by the chief engineer (which I highly doubt) that all it would do is aeriate the water.........
Again, thank you very much.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources