External Pressure on a Pipe
External Pressure on a Pipe
(OP)
Can anyone refer me to a method or standard for calculating pipe stress when applying a external pressure to a pipe?
For example, I am installing a fully encompassing spherical fitting around a existing run to create a new branch. After welding the spherical onto the existing run I am suppose to pressure test it at 1.5xMAOP. So I would be putting a external pressure that on the existing pipe run that is 50% greater than the internal pressure and I am worried about the stress on the existing run and possibly collapsing the pipe.
Has anyone else dealt with something like this?
Thanks in advance for your help.
For example, I am installing a fully encompassing spherical fitting around a existing run to create a new branch. After welding the spherical onto the existing run I am suppose to pressure test it at 1.5xMAOP. So I would be putting a external pressure that on the existing pipe run that is 50% greater than the internal pressure and I am worried about the stress on the existing run and possibly collapsing the pipe.
Has anyone else dealt with something like this?
Thanks in advance for your help.





RE: External Pressure on a Pipe
https://www.steeltank.com/Portals/0/pubs/Welded%20...
RE: External Pressure on a Pipe
RE: External Pressure on a Pipe
Small bits of pipe might need an FEA, or use a different fitting.
What pressure rating?
Remember - More details = better answers
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RE: External Pressure on a Pipe
I imagine phllp is referring to something like these:
https://www.google.com/search?q=spherical+hot+tap+...
RE: External Pressure on a Pipe
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.