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Thread: pentane
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30-11-2009, 06:43 PM #1
pentane
Hi All,
I came across a two door refrigerator,almost new that runs on pentane.Well call was as it was not cooling enough.I read a freezer temperature of -11 degrees celcius and 14 degrees celcius in refrigerator,well far from the normal temperatures expected from my side.I was in the verge to install a pierce vale to check suction pressure but was faced with the problem to braze back the pipe.I have a crimping tool but obviously has to braze the pierced copper.What can be done with these newly designed refrigerators as pentane is highly flamable and do not think is a good idea getting close with a brazing torch ! Any help would be appreciated.
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30-11-2009, 07:28 PM #2
Re: pentane
Need to recall it and recharge.
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01-12-2009, 02:57 PM #3
Re: pentane
Yes but how about to close pierce of valve or shall I leave one installed there ?
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01-12-2009, 04:31 PM #4
Re: pentane
It won't harm to leave it there as soon as it's leak tight.
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02-12-2009, 02:37 PM #5
Re: pentane
Ok then will do it this way.But if there's a circumstance that one has to open system,how can he braze if the gas is flamable ?
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02-12-2009, 03:29 PM #6
Re: pentane
^ I'm not sure what the other members may suggest, but I'd recover refrigerant, vacuum, purge with OFN (repeat at least 2x), measure pentane levels % - check not near explosion point - set strong OFN purge, get brazing.
This kind of thing is done in refineries & chemical plants routinely. There will always be some level of risk, with refrigerant hiding in system. A good OFN blanket is useful.
Not sure if there are other better blanketing gases around. I'd be interested to hear comments.
With this kind of job, I'd take along a spare pair of underpants - you may need them.Engineering Specialist - Cuprobraze, Nocolok, CD Technology
Rarefied Technologies ( SE Asia )
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02-12-2009, 07:28 PM #7
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03-12-2009, 06:54 AM #8
Re: pentane
Supco answered an email in which I asked if their peircing valve is considered suitable for use on hydrocarbons and they answered yes.
They are a permanent fix when fastened down after testing.
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03-12-2009, 02:51 PM #9
Re: pentane
Ok thanks so better keep a fire blanket just in case.
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