Michael has rightly commented .. there is no difference between fast transient generated by steam turbine inlet psv closure and psv opening or closure on pipe legs bound by two elbows, so far as force time histories are concerned.
Anyone working with fluid transient software know it very well since long.

In recent past, we have seen spring cans toppling in intermediate legs of centrifugal compressor hot or cold bypass line similarly just after opening of the bypass valve as the first few legs were only axially strengthened, not the longest one in pipe rack.
Regarding ethics,we engineers, earn to live a life worth living while saving people who depend on us!
Unethical life is a dog's life!
Sun will rise again, however dark the night is! We have faith in Almighty and ourselves!

Reg,
Sam
Refer the link to know the load .. tail pipe has both loads, while intermediate ones only wave load.

https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://cdn2.hubspot.net/hubfs/232514/Fauske-2017/PDF/EvaluationofDynamicTailPipeLoadsDuringReliefValveDischargeWithRELAP5.pdf%3Ft%3D1505490261269&ved=2ahUKEwjM49uds_fYAhXFppQKHR9cDjs4ChAWMAJ6BAgTEAE&usg=AOvVaw0JDLzRmfbxmQRuMEpIzcLG