How to register a fitting without using B16.9
How to register a fitting without using B16.9
(OP)
Hi, everyone
I got a project, it's a quick coupling for Nuclear Class2. Based on ASME III-NC, I have to do a burst test based on B16.9. The design pressure just 2700PSI, but based on B16.9, the burst pressure will be 20000PSI. The material is SA479 316.
Anyone has this kind of experience?
Thanks a lot in advance.
Michael





RE: How to register a fitting without using B16.9
What exactly are you wanting to hear?
Catastrophic tales of bursting 316SS blocks? I've witnessed burst testing appurtences ~5xDP and above and there were no issues, no indications, and no pieces taking eyes out.
Make sure you have the proper precuations in place and using the correct strain measurement technique and have fun.
Today is gone. Today was fun.
Tomorrow is another one.
Every day, from here to there,
funny things are everywhere. ~'Dr.' Theodor Geisel
RE: How to register a fitting without using B16.9
In order to register this coupling, I did a design report. I think the burst test pressure based on B16.9 is testing the safety of the body but not the seal. Because the thicker of the wall, the higher of the burst pressure it is.
I try the burst test, the Oring blew out at 15000psi.
Normally we do burst test at 4 times the DP, but for this case, I don't know what else I can do.
Thanks again.
RE: How to register a fitting without using B16.9
O-ring blow out is not failure in a burst test. In fact it is allowable 'modify' connections to the body in order to pressurize it to test pressure. I've seen test ends welded on, changing of seals to material that would withstand the burst test and go back to regular seal arrangement for production. You're testing the 'irregular' body configuration that cannot be solved with analytical techniques from the code. You're not leak testing.
I can't recall B16.9 but I thought test pressure was based on the required design pressure (from the specification) and the Sy of the material. Thickness of your wall is independent.
Today is gone. Today was fun.
Tomorrow is another one.
Every day, from here to there,
funny things are everywhere. ~'Dr.' Theodor Geisel
RE: How to register a fitting without using B16.9
I will try to weld those two parts together and try to explain to the inspector.
The equation of B16.9 is 2 times actual tensile strength times thickness and divide by the outside diameter.
Tomorrow will be better
RE: How to register a fitting without using B16.9
http://www.formweldfitting.com/4.html