×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Parallel Pump Calculation

Parallel Pump Calculation

Parallel Pump Calculation

(OP)
How can I calculate my pumps performance in parallel conditions?

In our LPG system we have two pumps (motor/turbine), usually motor pump is running most of the time. The common discharge line will split into tow streams one to rundown (LPG to storage) and the other one back to the column as a reflux.

Based on filed survey, it was noticed that running with a Turbine pump will not delivered the required head, on other word it is not equivalent to the motor pump. More money needs to be spent to upgrade the turbine pump.

We are planning to increase our unit throughput and based on the Engineering study it was found that another motor pump is required to run in parallel to the existing motor pump. Therefore, we are going to run with two motor pumps in parallel in the future.

The question is, how can I ensure that running with a motor and turbine pump in parallel will deliver the required flow for the future case?

We are thinking to carry out a test run now to run both turbine and motor pump is parallel to have a good base line.

What other things that I need to be considered during my testing? Your help in this matter is required. Thank you.


RE: Parallel Pump Calculation

first - are existing pumps in good condition? identical? pump rpm? meaning, are they operating as designed?

if so, then is piping system of sufficient size to handle the additional capacity?

is current piping configuration such that the overall flow resistance from pump common inlet piping to common outlet piping the same for each pump?

generally, pumps installed and operating in parallel should have nearly identical performance curves. if not, then the pump with the higher head capability will reduce the capacity of the lower head pump. typically, pumps operating in parallel will have additive flows at same developed head.

i'd be certain of existing installation before installing additional capacity. hence, check pump perf curves, piping installation, etc.

hope this helps!
good luck!
-pmover

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

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