What Is the Boiling Point of POE Oil at 500 Microns Pressure?

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Discussion Overview

The discussion revolves around the boiling point of POE oil at a pressure of 500 microns absolute. Participants explore the implications of pressure on the boiling point and the specific properties of the oil in question, with a focus on refrigeration applications.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant queries the boiling point of refrigeration POE oil at 500 microns absolute pressure.
  • Another participant seeks clarification on what "500 microns" refers to, suggesting it could pertain to different substances.
  • A participant mentions that in refrigeration engineering, it is generally assumed that oils do not boil at high vacuum levels, expressing doubt about this assumption.
  • Another participant argues that every liquid has a vapor pressure, and if the vacuum pressure falls below that, the oil will vaporize, emphasizing the need for a phase diagram to understand the relationship between pressure and temperature.
  • A participant points out the terminology issue, noting that "microns" is not a standard term in scientific contexts for pressure measurements.
  • One participant suggests that the answer to the boiling point question depends on specific knowledge of the oil and its phase diagram, recommending that the original poster seek technical information from the manufacturer's resources.

Areas of Agreement / Disagreement

Participants express differing views on the boiling behavior of POE oil under vacuum conditions, with no consensus reached on the specific boiling point or the implications of pressure on the oil's state.

Contextual Notes

The discussion highlights the importance of specific material properties and phase diagrams, which are not provided in the thread. There is also ambiguity regarding the terminology used for pressure measurements.

Yuri B.
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What may be the boiling point (temperature) of a refrigeration POE oil at, let's say, 500 microns absolute pressure ?
 
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Your question is unclear. 500 microns of what? Water? Mercury?

In any event, this information would probably be found on a material property sheet from the manufacturer.
 
Millitorrs are generally called "microns". It is assumed among refrigeration engineers that during vacuumation processes the oils in systems worked upon, themselves, do not boil - no matter how high vacuum would be achieved. I am in doubt.
 
Last edited:
Every liquid has a vapor pressure ... if your vacuum goes below that, your oil will spread through the vacuum.

Every electron microscope engineer knows this.

Of course the vapor pressure is also sensitive to temperature; you would need the phase diagram to cover all of the pressure-temperature points.Here is a discussion of your topic in a refrigeration engineer forum:
http://www.refrigeration-engineer.com/forums/showthread.php?15384-Vaporize-POE-Oil

PS: in the sciences we call a millitorr a millitorr ... your use of "microns" refers to "microns of Hg". I'm sure it is useful in your engineering jargon as a short way of saying what you mean, but it is certainly not a common expression.
 
I have already read this thread, thank you. (but it did not answer my question)
 
Why do you think we would know the answer? It depends upon specific, detailed knowledge of the oil and its phase diagram.

Thus you should be searching for technical information on your POE oil; for example, the manufacturer's website.
 

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