Is Hydro-Testing always Required On ASME Code Vessels
Is Hydro-Testing always Required On ASME Code Vessels
(OP)
Quick Question: Is it required to always perform Hydro-testing on ASME code euipment. We are currenty building some work bins that are being built to ASME and stamped. Do we need to perform the hydro-test, and if so is this required, and if not, why not? Thanks All, you guys are always great at answering these dumb questions!





RE: Is Hydro-Testing always Required On ASME Code Vessels
RE: Is Hydro-Testing always Required On ASME Code Vessels
RE: Is Hydro-Testing always Required On ASME Code Vessels
RE: Is Hydro-Testing always Required On ASME Code Vessels
We build vessels to Sect.VIII, Div.1, per UG-90(c)(2). The vessels cannot tolerate traces of moisture. So we pneumatically test per UG-100, rather than hydro test per UG-99.
The situation, naturally is complicated. First because of the extreme danger of pneumatically testing. Second, some vessels are above MAWP 500 psig and we test to 1.3x MAWP. (REALLY scary) Our AIA advised us that because we do not invoke UG-20(f), we are not limited by the Appendix 35-6 500 psi for pneumatic testing.
So far, the explanation given by our AIA has been accepted by Canadian Regulatory bodies. I conclude from this that the practice is "legal".
Don't know if this helps your situation, it may be food for thought.
RE: Is Hydro-Testing always Required On ASME Code Vessels
RE: Is Hydro-Testing always Required On ASME Code Vessels
There is many caveats that are spelled out in the code, and you need to read carefully.
RE: Is Hydro-Testing always Required On ASME Code Vessels
The customer wants the equipment fabricated to Sect.VIII, Div.1 and thats it. They are not requiring a hydro test, only a bubble test. I am not sure why they are wanting this as the hydro test is much more extensive and is required when equipment is built to Sect.VIII, Div.1. We are still trying to find out what the rules are...........why would they want this built to Sect.VIII, Div.1, but not proparly tested to Sect.VIII, Div.1. Any comments would be appreciated.
RE: Is Hydro-Testing always Required On ASME Code Vessels
Regards,
Mike
RE: Is Hydro-Testing always Required On ASME Code Vessels
RE: Is Hydro-Testing always Required On ASME Code Vessels
If you still doubt the customer's intention, go ask your project manager, who for unknown reasons, gives you little information about the work. Go ask him what the "work bin" is for. Would it be categorized as a pressure vessel? Where would this bin be installed? Did your customer checked with his local jurisdiction if work bins need to be registered and stamp? These are questions you need to ask your projects group.
RE: Is Hydro-Testing always Required On ASME Code Vessels