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Post by don on Aug 31, 2019 12:57:58 GMT
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Post by coldspaces on Aug 31, 2019 13:27:53 GMT
That is neat info. Surprised they said you could use them on so2 at all.
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Post by turbokinetic on Aug 31, 2019 13:41:27 GMT
Interesting and cool to see this old info!
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Post by elec573 on Sept 11, 2019 3:20:18 GMT
That is interesting.
For us novices what is the correct way to use and then purge say a vacuum pump and also do you need and special precautions with the gauges?
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Post by don on Sept 19, 2019 20:13:15 GMT
In this niche hobby of the repairing of obsolete refrigerating machines many of us can consider ourselves novices. Normally purging hoses is done so that air is not introduced into the machine you will be attaching your gauge set to. That would entail using a cylinder of refrigerant that is correct for the machine you are working on. Alternatively one could attach your hoses to a machine that is at rest and using the pressure existing in the machine to purge the hoses of air. That will not work on an at rest methyl formate machine that has not been sitting in a high ambient for many hours. (+100F)
For the Robinair hose purge recommendation the purpose is to remove the residual SO2 in the hoses and compressed air would suffice. EPA requires that any purging of refrigerant that must be reclaimed to be de minimus.
Vacuum pumps should have the pump oil changed multiple times with the pump run after each change so the clean oil is mixed with any contaminated oil trapped in the vanes.
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