I give an example:
Data:
Shell Equipment (Asme VIII Div 1)
Pd: 350 psig (24.12 bar)
Td: 225 °C (437 °F)
Shell Material: SA-516 70
E: 1
thk. nominal: 21 mm
corrosion allow.: 3 mm
min. thk. mesured: 16.51 mm (local thin area)...
I understand that if the patch is installed due to a leak, the pressure used for calculating the patch should be equal to the design pressure, on the other hand, if the patch is installed to cover a local thin area, the pressure for calculating this should be a pressure lower than the design...
Hi, My query
It is logical for me to think from this article that the pressure "P" to be used is the residual pressure, that is the pressure the patch should only withstand due to lack of thickness of the equipment or pipe, and not the total design pressure.
I will appreciate your comments...
