Contact US

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.

Students Click Here

Centrifugal screw pump or impeller

Centrifugal screw pump or impeller

Centrifugal screw pump or impeller

Hi Altruists,
I have attached a photo of a pump shaft with impeller.
I have come to know about centrifugal screw pump but here in our power plant i have seen a turbine drainage pump (it pumps condensate to a tank than to WTP again) which have both screw impeller and closed impeller.
Can anyone tell me which type of pump is this and how does this work?

RE: Centrifugal screw pump or impeller

This is a centrifugal pump with an flow inducer at the inlet. The screw allows the centrifugal pump to operate at a lower NPSH (net positive suction head) without cavitation. Hot condensate can flash into steam with the slightest drop in pressure.

RE: Centrifugal screw pump or impeller

Thanks Compositepro!!
I am here only for a week now and already impressed by the help i am getting.
Hope one day i can also contribute.

RE: Centrifugal screw pump or impeller

Can't add anything to that. It works by gently helping the flow into the eye of the impellor to reduce NPSHR.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Centrifugal screw pump or impeller

And don't be surprised if you see other ones of these and they look very different.
Each pump mfg tends to use their own style.
These are also used in cases where you know that you are pumping a two phase flow and want to prevent the gas from collecting and blocking fluid entrance to the eye.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

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! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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