Thanks for sharing your experience Jouku. I'll follow your advice. So far I haven't design up to the creep temperature range for expansion joint. As much as possible I don't want to use it as it is a weak spot in the system if improperly designed. It's still better to design using the natural flexibility of the piping system if space permits. I just happen to use it due to very low allowable nozzle load at the equipment connection but temperature is low.

Any other experience is greatly appreciated.

Cheers!!