×
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

Bushing issues
3

Bushing issues

Bushing issues

(OP)
My pipefitter has issues with using bushings.  I've heard of others not liking the practice of using bushings, but no one can explain why.  The only thing I've been able to find is that the lack of "meat" in a bushing doesn't lend much confidence to it's pressure rating.  My feeling is if a reputable company is willing to stamp it with a pressure rating, there should be no issues.  Any thoughts?

RE: Bushing issues

Bushing are allowed by Gas Code around here, as long as they are not nested (i.e. using two bushings together to get down to the desired size).  Good bushings will have the same pressure rating as your piping but you're adding one more potential leak point (threads) by using a bushing.  It depends on your fluid and process conditions though...

RE: Bushing issues

For B31.3 applications, threaded fittings are not permitted on the piping side of the piping isolation valve. Things are more flexible after the first block valve.

When I worked in a plant in the early 1970's we used bushings when necessary for small bore connection issues.  Since then I have heard that bushings were not acceptable.  I used a bushing last year on a UK device with straight threads to match nominal pipe threads in a nearly atmospheric application.  My suggestion would be to avoid bushings when possible.

RE: Bushing issues

I don't know the technical reasons for it, but at the refinery that I work at, we as a general rule of thumb do not use bushings. They are not included in any of our piping specifications.

Now, if you go out in the field you will run across them. Most of the time in a utility service, but not always..... The maintance people like to work by their own rules.
 

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