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


Heat Exchanger Bank PRV Losses

Heat Exchanger Bank PRV Losses

Heat Exchanger Bank PRV Losses

Hi All,

I'm trying to find some source that discusses how to handle manifolded heat exchangers protected by a single relief valve. We currently have 2 pairs of heat exchangers mounted nozzle to nozzle, with a short section of pipe connecting the pairs. The PRV is located off this connecting pipe.

When trying to analyze the PRV inlet loss, does one have to consider the loss of the 1st exchanger's relief rate through the flow of the 2nd heat exchanger towards the relief valve? If not, why? I've attached a quick sketch showing my thought. The only reference I can find is a page excerpt from a book on Google saying you start at the closest equipment.

RE: Heat Exchanger Bank PRV Losses

"Inlet losses" = pressure loss between the system and the PSV. This does not include the system itself.

The system of exchangers and the manifold is hydraulically connected and hence behaves as a single containment/system. "Inlet losses" refer to head loss between the system discharge flange (at the exchanger manifold) and the PSV inlet flange. The manifold is a part of the system and no friction losses should be accounted for within the system.

A similar example could be e.g. relief from the overhead line of a distillation column. In the moment of relief, the overhead line pressure can be quite lower than the tower bottoms pressure (depending on the relief flow), but that does not mean that inlet losses should be calculated all the way down to the tower bottom section.

Process Engineer, MSChE

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!


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