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Hi All,

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?

RE: Hydrotest


What is SMYS of pipe material?

What is design code and how have you calculated hydrotest pressure / what hydrotest pressure are you using?

So long as it's not more than 105% of SMYS you're Ok for hydrotest as it's not a sustained pressure.

You don't normally have thermal stress in a hydrotest.

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