I had a customer today that wanted me to make a copper to steel transition .
This is for a rig to cool natural gas so they can crack it.
Evap temp is gonna run -10f
They wanted to run the suction line in schedule 80 threaded pipe . I said not a good idea ,may hold at first bit after cycling the machine I was afraid thermal expansion and contraction would cause leaks . They are now going to socket weld it . They wouldn't let me run copper as they already have pipe and firings and say they are close to losing money on this deal.
Am I correct in telling them no threaded steel for refrigerant? ...