To all ammonia guys, this ones for you...

I am interested in finding out how low you can operate your discharge pressures in the winter. What is the minimum pressure you can run?

Any problems with liquid supply to the system?

How many of you are using liquid injection for oil cooling for screw compressors?

Or even, what type of oil cooling are you using? What have been the problems you have had with your oil cooling?

How about hot gas defrost problems?

Has anyone had experience running at 10C condensing with ammonia systems?