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[Cornbinder89]

Propane cyl are sometimes marked with their empty weight, They may do the same for R12 look for a weight stamped into the cylinder near the top/valve...

[Cornbinder89]

No, the reason I mentioned phase change is because high side pressure is irrelevant to the refrigeration process, The high side has to be in liquid form,...

[Cornbinder89]

There really is no "rule" rather there are accepted compromises for engineering limitations.
From a purely refrigeration standpoint, you...

[Cornbinder89]

I ran tube types up until I retired a year ago or so. I had started to phase them out, not because they were a problem, but because it was becoming hard...

[Cornbinder89]

A coupla things to keep in mind. Lots of things used to use 134a other than vehicles. The use has or will be stopped in the next year, no new items using...