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Old 03-10-2013, 03:23 PM   #1 (permalink)
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Weird white powder in old tank regulator.

In preparation for rehydroing a tank, I decided to take apart the HPR. I've been having a leak out of the pin valve for a while.

Anyways, everything looks good, except there's an almost tacky dry white powder all over everything. What the heck is it?

Also, I figure a light amount of non-petroleum lube would be nice. I've gotten conflicting answers as to whether I should use dow 33, dow 55, or vaseline. (Which is odd, because vaseline is a petroleum product.) Any recommendations? Preferably non-dow 55, since I don't have it.

I also figure I'll fix the leak by changing the valve seat or stretching the spring, probably will do both.
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Old 03-10-2013, 03:32 PM   #2 (permalink)
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dow33 is what you want to use.

I imagine the powder is whatever lube was used on it last, that's dried up.
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Old 03-10-2013, 04:17 PM   #3 (permalink)
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Compressors pull everything out of the air and concentrate it. Without cleaning up the air afterward, there's lots of things to be found. With lots of moisture you get Aluminum oxide from the bottle or other parts, which is white. Add some pollen and mold cooked from compression and maybe some compressor oil, and you have a tasty coating.
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Old 03-10-2013, 05:28 PM   #4 (permalink)
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Compressors pull everything out of the air and concentrate it. Without cleaning up the air afterward, there's lots of things to be found. With lots of moisture you get Aluminum oxide from the bottle or other parts, which is white. Add some pollen and mold cooked from compression and maybe some compressor oil, and you have a tasty coating.

Is it low in carbs?
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Old 03-10-2013, 06:41 PM   #5 (permalink)
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... or vaseline. (Which is odd, because vaseline is a petroleum product.) ....
Sprague, the manufacturer of the WGP megabooster, recommends vaseline as a lubricant for the moving parts in their manual. Seems scary since it's made to boost air to 5000psi, but I guess it's ok in that application.

Not saying it's what you want to use here, but that petroleum is sometimes used to lubricate in high pressure applications.
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