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!

*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.


Centrifugal Pump operating in zero gravity

Centrifugal Pump operating in zero gravity

A colleague asked me a pump question that I was unsure of. He asked if a centrifugal pump was operating in a normal 1g application and produced 50 ft. of head (water at 21.7 psi for example), and then went into a 0g condition.
If - Pressure = (Weight Density) x (Head) = (Mass Density x g) x (Head)
Then – once gravity (g) nears zero, then Pressure will also go to near zero.

Is this correct?

RE: Centrifugal Pump operating in zero gravity

No. The pump will develop the same head (pressure). Just as in a gravity field the outlet pressure of a pump is determined by the restriction to flow out of the pump. This restriction can be due to the rise in elevation of a pipe in gravity, or to a valve, or to pipe friction.

There might be some issues of getting water into the pump. Air pressure will still push without gravity but liquid will not go to the bottom of a feed tank without gravity or some piston. Before main engines are fired on a rocket in space small jets are fired to slightly accelerate the rocket so fuel and oxidizer moves to the bottom of the tanks.

RE: Centrifugal Pump operating in zero gravity

Thanks! – That was the first time I was asked about a pump application with a gravity condition.

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!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close