R290 LPG Used in a Locomotive train

[BradC]

Yes i know its really hard to get a license . But Doesn't anyone agree putting LPG into a moving vehicle and a massive expensive one of that a bad idea,

Dude, really?! Loads (like 10-20%) of vehicles carry 45kg of the stuff in the boot on a daily basis, plus an additional 60L of another hydrocarbon.

What do i do to the system to get it back running on r134a . He has done no changes to the system. Flush the system out replace driers . Put r134a of good to go ?

R290 is very (like very very very) miscible in lubricants, so pull a good vacuum for a decent period to ensure you suck it all out of the oil. The other thing that happens with BBQ Propane is the oil absorbs the ethyl mercaptan (the stench) from the gas. I'd put a burnout drier in if you can as the mercaptan can break down and release sulfonates into the system.