Hydrotest min. holding time
Hydrotest min. holding time
(OP)
I just remember that 30 minute is min. holding time in ASME Sec.VIII, Div.1. But I could not remember where this statment is.
Could anyone let me know the location of this statement?
Many thanks in advance.
Could anyone let me know the location of this statement?
Many thanks in advance.





RE: Hydrotest min. holding time
Regards,
RLS
RE: Hydrotest min. holding time
RE: Hydrotest min. holding time
RE: Hydrotest min. holding time
Thats a minimum time. It all depends on the time needed to fully inspect the system to ensure no leaks are present. For pipelines the BS8010 calls for 24 hour test.
RE: Hydrotest min. holding time
for in-place items, from a valve repair to the entire boiler, time would be dictated by how long it takes you to check the connection or walk the boiler down from top to bottom.
RE: Hydrotest min. holding time
you rise to the required pressure test, then lower the pressure to the MAWP, then inspect for leaks for whatever time is required to inspect.
GB
RE: Hydrotest min. holding time
RE: Hydrotest min. holding time
Sometimes it is impractical to blank off the vessel for the site pressure test so that you test through the vessel. Most people avoid this but it does happen sometimes. So if the shop hold test is equal to the site piping hold time then you have some confidence that no problems will show up in the field.
As a practical matter if you go to the trouble to set up for a pressure test then why not test for at least an hour? Whether the hold time is 10 min (B31.3), 4 hours (B31.4) or up to 8 hours (B31.8) the difference in cost is small considering what you pay for the vessel.
RE: Hydrotest min. holding time
you rise to the required pressure test, then lower the pressure to the MAWP, then the AI will inspect for leaks for whatever time is required to inspect.
if your AI does not know or support this, then he is wrong and the procedure needs to be discussed with his/her agency, (why not asking the National Board as well?)
RE: Hydrotest min. holding time
The Manufacturer must do this and the AI agrees.
There may be a desire to extend the 1.1,1.3,or1.5 pressure test for stress relief or to blunt cracks.
There needs to be adequate time for inspection for the AI AND the manufacturer at MAWP.
Review UG-90
RE: Hydrotest min. holding time
RE: Hydrotest min. holding time
Putting Human Factor Back in Engineering
RE: Hydrotest min. holding time
If, as a buyer, you want a longer hold time, you should specify it in the user's design spec.
RE: Hydrotest min. holding time
There is no statement in ASME B&PV Code Section Div1 like you have specified.