Hydrotest on flanged vessel
Hydrotest on flanged vessel
(OP)
I have recently designed some vessels with body flanges. In fact, each vessel can be divided into some parts. The question is that "Is it allowed to perform hydrotest on each section separately (using blind flanges) and then assemble the whole system or the whole system shall be tested at once?"





RE: Hydrotest on flanged vessel
There is a code interpretation VIII-1-01-04 on separate testing of vessel body and upper head.
RE: Hydrotest on flanged vessel
Thanks...
RE: Hydrotest on flanged vessel
Regards,
Mike
RE: Hydrotest on flanged vessel
RE: Hydrotest on flanged vessel
Regards,
Mike
RE: Hydrotest on flanged vessel
You could offer something less than 1.3X design as a final proof. The AI could sign off on a service pressure test rather than a full hydro.
Either way, good luck!
RE: Hydrotest on flanged vessel
The reason is that the hydrotest is for checking the pressure retaining components, not the gaskets, bolts and other removable components.
Cheers,
gr2vessels
RE: Hydrotest on flanged vessel
Part of the reason for doing the pressure test is to verify that the tank doesn't contain any leaks. I doubt that you'd get any repeat business if you installed a tank that leaked the first time your customers put product into it.
RE: Hydrotest on flanged vessel
The object of the post was a pressure vessel designed with a girth flange, not a storage tank. The BPVC is different from the API tanks standard. A pressure vessel is hydrotested for integrity purposes, not for gasket leaking.