I have a question regarding the hydrotest.
We have a pipeline of size 8 inch. The design pressure is 215 bar, installation temp is 13 deg c an dwall thickness is 7.3 mm with 0 mm corossion allowance.
While doing the calculation for equivalent stress during hydrotesting the system shows failure as teh calculauted stress is more than 90% of SMYS.
Equivalent stress is calculated as hoop stress +Expansion stress+sustained stress.
is this the right approach?