Oil Sep : AB oil freezing temp

[sdumper]

Specs:
Lowest zero load temp: maybe -85c/-88c but not for long and that temp will be in a 10 plate HX flowing fast
Running idle temp -76c or so
Load temp -68c to -74c
Metering TXV 01 orifice
Gas Ethane r170

Can I get by skipping the oil sep under the scenario above?

I really dont want to spend $154 on a floated Temprite 900 series oil sep and i dont want to use a cheap manual one...

[Jack]

Does the AB oil spec. sheet mention a freezing temp?

But I'm guessing that at -76* C idle, you would be cutting it close...

Why not use a simple home-build oil sep just to be sure?

[sdumper]

Does the AB oil spec. sheet mention a freezing temp?

But I'm guessing that at -76* C idle, you would be cutting it close...

Why not use a simple home-build oil sep just to be sure?

Cant find an AB oil spec sheet...


Never heard of a home built oil sep that was floated and I want it to be automated...

[ultralo1]

Specs:
Lowest zero load temp: maybe -85c/-88c but not for long and that temp will be in a 10 plate HX flowing fast
Running idle temp -76c or so
Load temp -68c to -74c
Metering TXV 01 orifice
Gas Ethane r170

Can I get by skipping the oil sep under the scenario above?

My guess is no, but if you have the time it would be a good experment.

[sdumper]

I may do that next week...im tired of messing with a manual oil sep and i dont want to buy a second floated oil sep...

[quintus]

...
Gas Ethane r170
...

Because of this i would say that a oil sep is not needed, for that range of temps.

[sdumper]

Because of this i would say that a oil sep is not needed, for that range of temps.

Thats what im thinking as well...

Im going to recover and remove that pipework Monday....

[[XC] gomeler]

My guess is no, but if you have the time it would be a good experment.

Agreed.

[sdumper]

Im betting it will work...I have had a first stage with a txv down to -72c with r402 without issues before so i dont see this being any different really...

[n00b 0f l337]

Nature of the beast. Sometimes it's more that the temperature at -70C is going to be in the highside of the second stage, and you get freezing in the HX or captube, and not necesarily in the evaporator.