Thanks PhillipF, i do have similar hopes I will take extra caution when dealing with ethylene.

@Crazy666: These compressor draw about ~230W on idle each, so they aren't power hungry horses most of you guys use here. So two 0.72kW condensors (one acting only as gas cooler - desuperheater) should be enough. I know that gas cooling isn't as efficient as liquid cooling but it should do it's job - dump low temperature stage's heat of compression so there is substantially less heat (of compression) needed to be transferred to high temperature stage.

Well, at least that is my theory.

Thanks for your kind support! Greetings,
N.