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


plan 53 flange system question

plan 53 flange system question

plan 53 flange system question

Got a question. I have seen pump vendors having a flanged (welded) plan 53 system and tubing running from the flange to and from the the seal. Is this common? Why would they do tubing rather than piping? If system is not to see the process media, why not NPT rather than flanged? I dont see the reasoning. Can anyone shed some light on this?

Thanks in advance.

RE: plan 53 flange system question

These are sensitive to friction losses, so you don't want hard pipe with elbows, you want tubing with smooth bends. The plan 53 is usually in pump vendor's scope, and the exact location relative to the pump is unknown, so the connecting has to be done in the field. Tubing is easier, bend it by hand.

Why would you prefer flanged hard pipe? Don't say cost because after all the cutting/threading/fitting labor, you're in the hole compared to stainless tubing.

People are also less likely to stand on tubing, compared to hard pipe.

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