This posts listed topic is really only part of the issue. As the famed radio commentator (Mr. Paul Harvey of the U.S.A.) says now the rest of the story.... Foglamp (HID?) mentions "On this horizontal pipe there are 3 PSV's connected by a weldolet."

Well frankly the idea of PSV piping loosely supported I find disconcerting. Especially if the PSV's start to simmer (pop open slam shut pop open slam shut etc., etc. ......)

These lines should be held down at least in a few spots relatively securely. Please review the non-mandatory chapter on relief piping found in ASME B31.1

Also a factor to be considered is the ever popular and mysterious flow induced vibration. Some people insist on full countoured welded insert to help reduce the likelihood of such phenomena.

So sustained, occasional stresses, and support lift-off not withstanding you have other issues to consider at the very least look at B31.1!