A little issue with our process drains and are now forced to pipe a safety/relief valve to a common header in order avoid further damage.  However in 'good engineering practice' this was supposed to be piped in order to avoid and undo stresses during operation with pipe travel.  I was thinking of having a bellows expansion joint fabricated, would this be against boiler or B31.1 power piping code and has anyone come across this issue before.  This is a safety valve off our FW pump with 3000 psi @ 330F.
Use a flexible ball joint in the line if you're concerned about pipe stress. Bellows will eventually have to be inspected on a regular basis for fatigue.
There are a couple of companies that make these flexible ball joints.
I'm familiar with one in Chula Vista California called Hyspan. They also make the bellows type conectors that you're referring to.

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