Nozzle Re-Pad Questions for a vessel with 24" standard pipe
Nozzle Re-Pad Questions for a vessel with 24" standard pipe
(OP)
I working on a storage vessel, it uses 24" pipe as the shell, heads are pipe caps. There are several nozzles with the size equal to or greater than 4". Two manhole's sizes are 10".
According to ASME code, the re-pads should be considered. The vender said it is not a standard vessel, and they are not going to stamp it per ASME Sec.VIII Div.1. I am struggling with the re-pads.
Could you give me some suggestions.
Thanks,
According to ASME code, the re-pads should be considered. The vender said it is not a standard vessel, and they are not going to stamp it per ASME Sec.VIII Div.1. I am struggling with the re-pads.
Could you give me some suggestions.
Thanks,





RE: Nozzle Re-Pad Questions for a vessel with 24" standard pipe
1) Where in the world are you located (i.e. does your local jurisdiction require compliance with the ASME Code, by law)?
2) What is the length of the "storage vessel"?
3) Pressure/temperature/materials of construction?
RE: Nozzle Re-Pad Questions for a vessel with 24" standard pipe
2) Vessel Length is 10' TAN to TAN
3) DP: 15 PSI, DT: Ambient/ Material: SA-106B 3/8" THK, Horizontal vessel, Saddle and base plate: SA-36
Thanks,
RE: Nozzle Re-Pad Questions for a vessel with 24" standard pipe
I take it that you have performed the opening reinforcement calculations according to UG-36 and UG-37? These calculations would be based on the nominal thickness of the vessel shell wall, as well as the required thickness from the calculations. For such a low pressure, the required thickness may be very low, and accordingly the openings may be self-reinforced. If they are not, then you can either chose a self-reinforcing nozzle, or a fillet-weld attached reinforcement pad on the shell.
Where's the confusion?
RE: Nozzle Re-Pad Questions for a vessel with 24" standard pipe
Yes, the calculated required pad thickness is very low. What do you mean that the openings may be self-reinforced (don't need re-pad?), For example: The design THK is 3/8", the nominal THK:0.3125", and the calculated required pad thickness is 0.0625". So, in this case, it is self-reinforced and don't need additional re-pad. Is it what you mean.
Thank you again for your help.
RE: Nozzle Re-Pad Questions for a vessel with 24" standard pipe
RE: Nozzle Re-Pad Questions for a vessel with 24" standard pipe
Thanks,
RE: Nozzle Re-Pad Questions for a vessel with 24" standard pipe
Go through the UG-27 calc and the UG-37 in full.
RE: Nozzle Re-Pad Questions for a vessel with 24" standard pipe
RE: Nozzle Re-Pad Questions for a vessel with 24" standard pipe
RE: Nozzle Re-Pad Questions for a vessel with 24" standard pipe
RE: Nozzle Re-Pad Questions for a vessel with 24" standard pipe