Situation:
A section of 8" diameter pipe transfering hazardous material was damaged when the overhead portion of the pipe rack was damaged by moving equipment. A long section of the piping was left unsupported and the first ell that turns up to the rack fell (dropped) about 2 feet to the ground.

When I model the existing piping and remove the supports at the bridge and add a new support for the ground, the SUS case fails to the tune of about 200%. However, the pipe is still in service, i.e., no leaks. Temporary supports have been added where the bridge used to be, but CII gives similar overstress values with the added supports due to the original large displacement.

I’ve never checked the OPE case per APP P before now; the results are about 70% (note the EXP stress is low which may explain partly).

Question: Why has the piping not failed catastrophically with a SUS stress ratio of 200%?

Depending on responses, there may be some followup questions.

Thanks for your consideration . . .