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.
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
It is a constant load support, so the force remains the same.
RE: Constant Spring Hanger Setting During Commissioning
- 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
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
It would be helpful for me and others as well.