Thanks for your answer Mariog. 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 pressure, it would correspond to the residual pressure between the design pressure and the pressure that can withstand the local thin area plus the expected corrosion.

Regards,
CMP.