Pipe Stress on Expander -Recompressor Outlet/Inlet

[dungun]

Hi
1) What is normally practice of multiplier of NEMA SM23? for turbo machinery?.
2) Any concern of the straight length for discharge and inlet pipe for Turbo Expander?. What is value?

 

[TangoCleveland]

We recently designed a turboexpander/compressor unit from GE Rotoflow. They used a NEMA SM23 multiplier of 3 for nozzle loads. I don't recall their required straight lengths, but we couldn't achieve them. I believe it was on the order of 10 diameters for the expander suction and 5 diameters for the discharge. Our inlet piping was 30" diameter with 48" discharge.

Larry