×
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

pumping in parallel

pumping in parallel

pumping in parallel

(OP)
what is the power consumption when pumping in paralel?

do you add the individual power consumptions of each pump?

RE: pumping in parallel

Yes.

RE: pumping in parallel

If you had one pump running and started a second in parallel, the power would not double... you have to find the new operating point as the intersection of the system curve with the two-pump curve (double the flow rate at any head).  The knowing the operating point use the head (dp) to go back to the individual pump curves to determine the bhp for each.

=====================================
Eng-tips forums: The best place on the web for engineering discussions.

RE: pumping in parallel

(OP)
in effect, what system would consume the more power, the single pump system delivering the same flow & head OR the parallel system?

RE: pumping in parallel

That depends on how is the system designed. If you have one pump with a system curve joint at close to the Best Efficiency Point, and you add the second pump in parallel without modifying the piping system (except for the piping around the pump), the combined pump curve will join the system curve at left side of the BEP with lower efficiency. That means, the pumps consume more power than the increase in flow delivery.

If you added the second pump while modifying the piping system (with larger pipe size)to make the total friction lose same as previous for one pump, you are getting doubled flow with same efficiecy - just like as if you added a parallel system.

RE: pumping in parallel


one big pump will probably have better efficiency than two smaller pumps delivering same Q,H; but this effect is not important compared to other design issues (proces demands, reliability...and commercial offers!)

usually we consider that by increasing pump size, relative dimensions of gaps and tolerances decrease, resulting in better efficiency.  

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