×
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!
*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

Impeller Design

thread407-12601

Impeller Design

Impeller Design

(OP)
I was wondering if anyone could help me with improving the TDH of a standard End suction pump with a closed impeller?
A brief history:
The pump has a full size impeller
The speed conforms to the speed of the sales curve.
The Pump delivers 5m head lower then the performance curve ..at Shutoff head.
 Any info would help greatly!!

RE: Impeller Design

Could the impellars be worn?

Best Reagrds

Morten

RE: Impeller Design

Have you checked the wear on the impeller wear rings?  Verify the correct clearange bewteen the impeller inlet shroud OD and the pump casing inlet wear ring ID.  If it were a semi-enclosed impeller, then check the impeller end clearance.

RE: Impeller Design

You did not provide anywear near enough info so we can only wildly guess.  Wear ring clearances as butelja suggested often cause performance loss and the smaller the pump and the lower the Ns of the pump the more effect wear ring clearances have.

What hp and what rpm, NPSHA vs. NPSHR, Pump Nss and Ns, impeller diameter?  Whatever you have would help.

PUMPDESIGNER

RE: Impeller Design

Also, make sure your calc's are correct (adjusted to centerline of the pump).  Some pump manufacturers calculate the performance of the pumps they publish, so it isn't uncommon to find one "out-of-spec".  Also, they only guarantee one performance point, not the whole curve.

Also, what type of drive.  I assume direct and not magnetic.

RE: Impeller Design

I doubt Trojan is still watching this thread, the last time they are showing as logging in to the site is October 24, 2001

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

Resources

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
The Great Project Profitability Debate
A/E firms have a great opportunity to lead the world into the future, but the industry’s greatest asset—real-time data—is sitting wasted in clunky, archaic ERP platforms. Learn how real-time, fully interactive dashboards in a modern ERP allow you to unlock data that will shape the future of the world. 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