×
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

Cold Load for Spring Hanger

Cold Load for Spring Hanger

Cold Load for Spring Hanger

(OP)
Dear All,

I just want to know if an existing spring hanger can be reset with different cold load? Because the EXISTING cold load is 12978 N but upon changes in the line the spring cold load increases to 14653 N. I already checked the spring table and still the hot&cold load were within the allowable/range.

Thank you.

Sincerely,

marchie

RE: Cold Load for Spring Hanger

I believe that when it's within the range of the hangers capabilities (travel range not exceeded etc.) then yes.

RE: Cold Load for Spring Hanger

(OP)
XL83NL,

Yes, it is still within travel range/load. But I think the cold load was usually set upon installation. Please correct me if my information is incorrect.
What will be the purpose of cold load if it can be changed/reset? Aside from checking the range/variability(%).

Sincerely,

marchie

RE: Cold Load for Spring Hanger

The purpose of having a changeable travel range of a spring hanger is that it allows to have only few hanger models for a large range of loads and travels, rather then a unique version for each travel/load combination. The cold load is indeed set before installation by a special device which the MFR uses for this purpose (some sort of pre-tensioning device).

RE: Cold Load for Spring Hanger

XL83NL,
I think you mean pre-compressing device!!!

RE: Cold Load for Spring Hanger

Haha, yes, whoopsie thumbsup2

RE: Cold Load for Spring Hanger

Marchie,

On that last question, the point of setting to the cold load is that when installed and chocks removed it will be at the conditions it was designed for, aside from minor adjustments. And it gives a marker on the plate to return to if minor adjustments were needed in the future.

If the preset cold load was at an arbitrary 50% mark of the total travel, in some cases you would have to overload/"oversupport" the pipe to properly remove the chocks and then loosen the load to reduce it back to the intended cold load for your service. This could possibly overstress connected equipment or connections during installation. Providing this to the vendor they set it exactly where needed to adequately support the deadweight of the pipe/components. When the pipe is supported by the hanger, if designed and specified properly, you should be able to easily remove the top chock from the hanger.

The last advantage of a preset cold load is that it is a calibrated value. That spring is exerting virtually that exact cold load when installed if no travel is observed. Any adjustments in the future are done somewhat relative to this calibrated value.

Thanks,
Ehzin

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