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


Pump Bypass Piping (Not Recycle Line)

Pump Bypass Piping (Not Recycle Line)

Pump Bypass Piping (Not Recycle Line)

I am trying to find some guidance or literature on bypass piping from pump suction to pump discharge and I am coming up empty handed. This is not a minimum flow recycle bypass.

We have a 3" NPS pump suction, 3" NPS pump discharge, and 2" NPS pump bypass that travels from the pump suction to the pump discharge.

I am trying to find some guidance or literature that states whether or not the bypass piping should be the same NPS as the pump suction. The pumps are being used to unload RGP from tanker trucks. In the event that the tanker truck pumps are used, the RGP will bypass our pump to the discharge piping and travel to the storage tanks.

RE: Pump Bypass Piping (Not Recycle Line)

1, Make the Bypass line the same size as the rest of the piping.
2, Arrange the piping and Valving so the Bypass can be isolated if in not use.
3, Arrange the piping and Valving so the Pump (via the Pump Suction & Discharge Valves) can be isolated

This way if the Pump fails or needs maintenance it can be shut down but the Unloading can continue with the Truck mounted Pumps.

Sometimes its possible to do all the right things and still get bad results

RE: Pump Bypass Piping (Not Recycle Line)

Thanks pennpiper. My opinion was that they should all be the same size. My argument as to why was lacking.

RE: Pump Bypass Piping (Not Recycle Line)

If they expect the same flows then they should be the same size.
pennpiper's advice about isolation valves for both bypass and pump is right on.
When people will complain about the cost of the extras valves ask them if they would rather shut down the operation.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

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


Research Report - What’s the State of Nonlinear Simulation?
Simulation is an increasingly valuable tool across the product design workflow, but not all simulations are equal. We set out to determine how engineers and product designers make use of specialized analyses, how they incorporate nonlinear simulation into their work and how they rate the available software. Download Now
White Paper – Data Security and Know-How Protection
Our data is constantly exposed to the danger of being intercepted or stolen as it wends its way over global data networks. Data security measures and measures for protecting intellectual property should not, however, first be implemented when data is exchanged – companies must lay the foundation for these measures within their own organization. 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