ACME / Stub ACME pressurized limitations?
ACME / Stub ACME pressurized limitations?
(OP)
If you consider a pipe with internal pressure connected together with a stub acme thread, and the o-ring is not on the pressure side. Then you will have a burst effect on the female thread and maybe a small collapse effect on the male. So what I want to know is the reduction in capacity (thread shear capacity). Please see attached picture.





RE: ACME / Stub ACME pressurized limitations?
RE: ACME / Stub ACME pressurized limitations?
PS.: The reason for having the o-ring on the low-pressure side is to verify the o-ring entrance.
RE: ACME / Stub ACME pressurized limitations?
Ted
RE: ACME / Stub ACME pressurized limitations?
We did actually "blow" a Stub Acme thread once during a pressuree test long before we could have dreamt it, and we found out during the investigation that since the acme threads are not self centralizing only one side had begun the separation process, and finally BOOM!!! So theory and practice doesn't always go together. We could clearly see that on the "upper half" of the female thread the threads were destroyed on the inner edge, while on the "lower half" of the female thread the threads were destroyed on the outer edge. So the box had tilted as result of the un-symmetric load scenario.