vent hole in the reinforcement pads
vent hole in the reinforcement pads
(OP)
I think the vent hole in the reinforcement pads for pressure vessel should be visibleā¦.
however I could not see any requirement in ASME 8 Div.1 required this issue
As i know, the purpose of the vent hole is to use it for pneumatic test to insure the condition of the weld on the reinforcement pads. The required test was completed, but they may need to do while it is in-service.
Also, the vent is used to know the corrosion condition on the pad, because the corrosion always starts on the vent.
however I could not see any requirement in ASME 8 Div.1 required this issue
As i know, the purpose of the vent hole is to use it for pneumatic test to insure the condition of the weld on the reinforcement pads. The required test was completed, but they may need to do while it is in-service.
Also, the vent is used to know the corrosion condition on the pad, because the corrosion always starts on the vent.





RE: vent hole in the reinforcement pads
I've never heard of a post construction test of a repad. I have seen leaks resulting in weep hole weepage (?) in piping connection and tank nozzle repads, not on vessels. I have even seen well meaning technicians install a valve into the leaking threaded connection and then close the valve... I've never seen any effort to be sure that the weep hole is visible. If the vessel is insulated, the entire repad will be under insulation.
I think you'll find Thread794-25516 interesting reading.
jt
RE: vent hole in the reinforcement pads
Do not place any fittings on the weep hole or plug weld the weep hole!!
RE: vent hole in the reinforcement pads
Steve Braune
Tank Industry Consultants
www.tankindustry.com
RE: vent hole in the reinforcement pads
UG-96(b) and UG-99(g)(3).
RE: vent hole in the reinforcement pads
also to isolate the vessel from the pad, clearing air/gas trapped.
E.R.
RE: vent hole in the reinforcement pads
You do not want the repad to be a pressure vessel itself. The repad thickness is likely not suited for the full operating pressure and if the weld leaks the resulting (over) pressurization of the repad could cause it to fail and become an unidentified flying object - not a good thing.
Regards, John.