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Old 04-13-2009, 09:17 AM   #21
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Quote:
Originally Posted by NickTech View Post
min evac. level mandated by epa on vacuum pumps are 500 microns, even if you could pull down to 200 microns the vacuum would only be 29.91"hg. vacuum pump oil has a boiling point under atmospheric conditions between 721-1004 deg f,and will not vaporize at that point under that vacuum.
The oil does not evaporate. It degases.

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Old 04-29-2009, 05:32 PM   #22
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the final answer is
Even Even A!
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Old 05-06-2009, 01:22 AM   #23
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I am inclined to agree with NickTech, since he does actually back up his answer with a source.

Does it count as cheating on the quiz when I look at other people's answers?
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Old 05-06-2009, 05:41 AM   #24
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Quote:
Originally Posted by NickTech View Post
section 608 of the federal clean air act, under prescrided evac. rate. (EPA.gov)
I think you'll find that is not a regulation.
But a recomendation.
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Old 09-01-2009, 06:28 PM   #25
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“Evacuate
the system to below 200 microns.” This should not
be considered. Note that the word “system” is used
here, because it is possible to evacuate piping or
some component other than the compressor to below
this level. Refrigeration oil has a vapor pressure and,
by going below 200 microns, you will degas particles
of the refrigeration oil. Be aware that if you change
the makeup of the oil, it will no longer be a true
lubricating oil.

Source - jbind.com/tools/userfiles/file/Deep_Vacuum.pdf
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Old 09-01-2009, 06:59 PM   #26
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Check the original cpyright date on that article, or the sourse for that article.
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Old 09-01-2009, 07:03 PM   #27
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Quote:
Originally Posted by cralx2k View Post
“Evacuate
the system to below 200 microns.” This should not
be considered. Note that the word “system” is used
here, because it is possible to evacuate piping or
some component other than the compressor to below
this level. Refrigeration oil has a vapor pressure and,
by going below 200 microns, you will degas particles
of the refrigeration oil. Be aware that if you change
the makeup of the oil, it will no longer be a true
lubricating oil.

Source - jbind.com/tools/userfiles/file/Deep_Vacuum.pdf
go to the principal's office. You peeked at the test answers on my desk
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