Add studding pad
Add studding pad
(OP)
I have a 10' diameter CS API 650 tank, flat bottom.
It's about 15 years old. Customer wants to put a 6"
studding pad (thru a vertical weld)located about 6" from
the bottom plate. There is no information on this type
of connection. Does it still need a repad added? Can it just
be welded in or should it be made part of an assembly?
Thanks,
It's about 15 years old. Customer wants to put a 6"
studding pad (thru a vertical weld)located about 6" from
the bottom plate. There is no information on this type
of connection. Does it still need a repad added? Can it just
be welded in or should it be made part of an assembly?
Thanks,





RE: Add studding pad
RE: Add studding pad
Api just states repads based on nozzle size. So are you suggesting to use
maybe the ASME pressure vessel code method?
RE: Add studding pad
1. A repad. (5.7.2.3(b)
2. Excess shell thickness above the required shell thickness. (5.7.2.3(d)
3. Excess nozzle thickness above what is required in Table 5-4(b). (5.7.2.3(c) and 5.7.2.4)
Limits of reinforcement are provided as well. The procedure is similar to the ASME pressure vessel code procedure, but may have some small tweaks. I haven't done these calculations for a few years though. I believe the reinforcement limits for the nozzle are different for one.
RE: Add studding pad
RE: Add studding pad
These are more common on pressure vessels rather that API 650 style tanks.
MJCronin
Sr. Process Engineer
RE: Add studding pad
customer said that space was very limited but it seems like
a regular nozzle would have work? If I get more info, I'll
let you know.
RE: Add studding pad