×
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

Constant Spring Hanger Setting During Commissioning
3

Constant Spring Hanger Setting During Commissioning

Constant Spring Hanger Setting During Commissioning

(OP)
Hi guys,

For constant spring hanger (lug attached to a structure case), we will carry out cold setting as per stress designed during cold condition before the piping is put in service. In commissioning stage, which by right the locking pin has been removed, the supported pipe will travel up to a certain level.Based on my understanding, if the travel point is till lower the hot point, we will not do anything to the spring and leave it as it is. My question is, what should we do if the indicator go beyond the hot point? I mean exceeded the hot marking of the spring hanger. Hope anybody can give me some lights on this matter.

RE: Constant Spring Hanger Setting During Commissioning

adjust the rod, so that the indicator is in the middle.
It is a constant load support, so the force remains the same.

RE: Constant Spring Hanger Setting During Commissioning

- check if there sufficient travel left in the hanger. if there's too little travel left, the pipe may want to move up but is jammed. so hold periodic inspections to see how the travel evolves over time.
- review your stress analysis. your design may be wrong, or other supporting structures may cause negative influence. find out the causes, and adjust accordingly.

RE: Constant Spring Hanger Setting During Commissioning

Good points above. Follow them. In operation, at nominal hot temperatures of everything, the constant force hanger should be "near middle" of the hanger movement.

Almost all of the time, the pipe hangers are sized and positioned so no hanger is "bottomed out" nor "top crushed" when shutdown. Not always, but almost always. If you are seeing that, check everything as mentioned above: This kind of finding is why they call it "testing" and "commissioning" rather than "startup" 8<)

You may have to replace a hanger, or adjust a hanger upstream of downstream of the one being crushed too tight. I had one case where the hangers were fine, but the structural steel I-beam between the hangers bent.

RE: Constant Spring Hanger Setting During Commissioning

(OP)
Thanks guys for your knowledge and experience sharing.
It would be helpful for me and others as well.

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