repad - UG37 of BPVC VIII-1
repad - UG37 of BPVC VIII-1
(OP)
Does anyone know of a vendor that stock or make the repads specified to UG37 of the code. The outside contractor I work with doesn't know and I am not in the pressure vessel industry.
I thought a machine shop could make the repad from a flat piece of metal and form it to the outside diameter of the vessel...
see attachment for repad that I'm referring to.
Thanks!
I thought a machine shop could make the repad from a flat piece of metal and form it to the outside diameter of the vessel...
see attachment for repad that I'm referring to.
Thanks!





RE: repad - UG37 of BPVC VIII-1
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: repad - UG37 of BPVC VIII-1
These repads would likely meet the requirements of UG-37, but I'm hoping you are still performing calculations to support the design. There are all sorts of special cases where these might not work (large openings/etc...).
Cheers,
Marty
RE: repad - UG37 of BPVC VIII-1
@SnTman, that are probably not stock, you're right.
@Marty, yes, I did use the boiler code to confirm the design.
As a follow up question related to nozzle reinforcement. Does the boiler code allow for a saddle instead of a repad? Seems like saddle is more common in process piping world - ASME B31.3. The boiler code does mention saddle but doesn't really goes into specifics on analysis. Our vendor isn't too fond of using the repad because of the inner weld between the nozzle and the repad. As he explains it, you have a fillet on top of a weld. With a saddle, it's two fillets welds and there are no welds that stacks on another weld.
Regards,
Monk
RE: repad - UG37 of BPVC VIII-1
A saddle is listed in the code in Fig.UG-40(f), and UW-16.1(f-1).
I don't know of any software that directly models this, but it could be calculated in the same way as for a repad. The effective repad thickness would just be the saddle thickness minus the shell thickness.
Cheers,
Marty
RE: repad - UG37 of BPVC VIII-1
Thanks!
Monk
RE: repad - UG37 of BPVC VIII-1
Please explain, how about a sketch? UG-40(j) maybe?
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: repad - UG37 of BPVC VIII-1
-Monk
RE: repad - UG37 of BPVC VIII-1
RE: repad - UG37 of BPVC VIII-1
Thanks,
Monk
RE: repad - UG37 of BPVC VIII-1
As compared to a plain old pad, it looks like an expensive detail to me...
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: repad - UG37 of BPVC VIII-1
RE: repad - UG37 of BPVC VIII-1