Hello,

In Annex 1,

I showed the formula from API520, where the force resulting from the opening of the safety valve, consisting of the dynamic and static forces, is determined.

The Autopipe program, in the tab Loads>Fluid transient determines the force value from the dynamic effect (Annex 2).

When performing a Timehistory analysis, the occasional stress program adds the flow loads and gives results in the form of pipe stresses.

I would like to ask whether the static force component of the pressure and the active surface of the pipeline should be added in each bend of the pipeline section (similarly to expension joints when entering difference betwen the effective area of the expansion joints and the cross section of pipe )?

Thank you in advance for your quick reply.