Panache
International Hazard
Posts: 1290
Registered: 18-10-2007
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Mood: Instead of being my deliverance, she had a resemblance to a Kat named Frankenstein
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A further fridge pump question....
Firsty to clarify, in refering to fridge pumps i think we are generally referring to 'squirrel cage motors'.
So my question relates to my air compressor, which is a dentist/bank variety that has a squirel cage motor atop a small holding pressurised holding
cylinder that outlets into some filters (oil, water).
These compresors run oil that i assume covers and coats the internals and is largely immiscible with the fluid ordinarily being compressed, which is
air, and is rudimentarily seperated from it before leaving the compressor.
The compressd air accumulates into the cylinder whereupon water, present in the air condenses into the bottom of the cylinder, requiring routinue
removal, oil not effectvely seperated out also accumulates here and must be replaced from time to time.
If properly cleaned and suitability/compatability assesed in regards to gasket, rubber,oil and flange materials within the pump/compressor there is no
reason why any gas connot be fed into the air intake of this unit and compressed safetly.
So my question is, is that last paragraph largely true?
Basically can i use it to compress hydrogen and does anyone have any clear advice regarding this. I have done much reading on this, im very familiar
with this gases strict requirement not be compresssd with any oxygen present, requiring flushing and bleeding cycles.
Im after the 'yeah ive done this and watch out for...' style of advice please.
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draculic acid69
International Hazard
Posts: 1371
Registered: 2-8-2018
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I don't know about compressing H2 using a fridge pump but I do remember Cody's lab did a video on compressing H2 and it detailed how he separated
O2 from the H2 .it was a pretty simple setup involving jars beach balls and catalytic converter honeycombs.and as far as fridge pumps go I've tried to
use them from recovered fridges and at most out of four attempts I've only got one to turn on for like two minutes before it stopped for whatever
reason.with the price of harbor freight vac pumps and aspirators I'll never try another fridge pump.
[Edited on 22-8-2019 by draculic acid69]
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Ubya
International Hazard
Posts: 1247
Registered: 23-11-2017
Location: Rome-Italy
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Mood: I'm a maddo scientisto!!!
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if the system has no oxygen (there are a few steps to do this) you are pretty safe with hydrogen. if you want to compress oxygen, on the other hand,
you can't use a compressor that uses oil, it can go boom
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feel free to correct my grammar, or any mistakes i make
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XeonTheMGPony
International Hazard
Posts: 1640
Registered: 5-1-2016
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Mood: No Mood
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A hermetic and semi hermetic refrigeration compressor is fine for compressing hydrogen, you do want to aggressively filter and clean the out let gas,
best to do this after cooling.
Then run through your drying stack to final storage if storing any amount you want 316L stainless steel, starting from a check valve into the main
header of your piping system, all pipes should be 316L as well.
Dental blowers (I would not call them a proper compressor) are ill suited for such use.
Newer compressors you will need to thoroughly clean and replace their oil with a mineral oil as the current oil will become acidic on exposure to
moisture.
[Edited on 22-8-2019 by XeonTheMGPony]
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