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Join Date: Feb 2016
Posts: 5

Water And Oil

02/25/2016 11:18 AM

I service Environmental test chambers These use single stage or cascade refrigeration and are capable of producing -100F temperatures controlling at +/- 1 degree ( cascade)

I have a customer who has a water cooled system and was using well water for their water cooled condenser which is so acidic it "ate" through a copper fitting on a heat exchanger and allowed water to enter the system

I will have to replace the scroll compressor, receiver, and a number of parts in order to be sure this system will run reliably as some of the testing done in these systems are prototypes and worth hundreds of thousands of $$

I can remove the water content by using L2 at a high volume heat strips on the components and pressure along with my magnet tool to open any valves then evacuate this for days etc and hope the H2O is gone but there is still oil in this system that is contaminated that is the worry I can use a flush and I have access to gallons on Isopropl alcohol but how you I know all the oil has been removed? do I have to flush every valve, etc ? I am worried about any remnant water or oil plug that would or could happen while running and render the test useless Suggestions? Is there better way?

Thanks!!

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#1

Re: WATER AND OIL

02/25/2016 11:31 AM

I would use a suction filter drier cleanup kit....

https://meus.mylinkdrive.com/files/PAC-SPRFCS_System_Product_Guide.pdf

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#2

Re: WATER AND OIL

02/25/2016 11:54 AM
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#9
In reply to #2

Re: WATER AND OIL

02/25/2016 3:01 PM

THIS is interesting! who sells this? I am in FL

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#3

Re: WATER AND OIL

02/25/2016 11:54 AM

What is L2? You certainly don't mean the second Lagrange point, the James Webb Space Telescope will be eventually placed there. Is L2 a typo for LN2 which is an abbreviation for liquid Nitrogen. The boil off of LN2 will be very pure nitrogen gas but purging with this very cold liquid (-321° F) will not remove water or any kind of oil.

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#4
In reply to #3

Re: WATER AND OIL

02/25/2016 12:00 PM

in the old days old fogies like Tornado just flushed this through

then 2 of these overnight

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#5
In reply to #4

Re: WATER AND OIL

02/25/2016 12:20 PM

Close, but not quite; I was never really a FreonTM guy.

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#6
In reply to #5

Re: WATER AND OIL

02/25/2016 2:17 PM

before it was banned I used 11 for acidic burned out systems. they get clean as a whistle and no oil anywhere!

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#8
In reply to #6

Re: WATER AND OIL

02/25/2016 3:00 PM

I knew this as we used this in the "old" days too I've been doing this for over 35 years so I've just about seen it all Just trying to be within the laws Is there a replacement for R11? Something that wont make me glow in the dark.....

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#7
In reply to #3

Re: WATER AND OIL

02/25/2016 2:54 PM

L2 is the dry nitrogen inert gas typically used in production of PC boards or in mechanical switches etc at high heat ( 2-300C) LN2 is liquid nitrogen that in my business is used to boost cooling capability of a test system when a device under test requires very intense temperature ramp rates to create Thermal Shock to that product to test for failure

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#10

Re: WATER AND OIL

02/25/2016 3:11 PM

I should have pointed out that the entire system was filled with water right up to and in the scroll compressor LOTS of acidic nasty H2O this is why I am replacing most of the components to be better safe that sorry BUT I don't want to repipe don't see that need and don't even want to go there This system costs a cool $85K so it needs to work when flip the switch

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#11
In reply to #10

Re: WATER AND OIL

02/25/2016 3:46 PM

the majority of water and acid will be in the compressor. once you pull that its a mater of blowing/flushing the lines clear. I'd cut the pipes and install a few of thesethen this

http://www.ebay.com/itm/R11-RX11-Flush-Air-Conditioning-Refrigeration-Flush-/400112472598

depending on system, size. a liquid line filter remove the access valves, seal it all and triple evacuate don't forget to bleed a bit of nitrogen into the lines while soldering to prevent sooting

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chamberman (4); Fredski (4); redfred (1); SolarEagle (1); Tornado (1)

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