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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Im about to run some degassing trials, I've got almost everything at hand but the time.
However not all materials resist an influx of water vapor and gas. as we know the common number used in transformer oil is 70% nitrogen and 30% oxygen, versus the atmospheric normal of 78% to 21%.
so my question is: If i go to all the trouble of degassing oil, then put it in PVC pipe as i usually do with resistors and capacitors, will the PVC or acrylic slowly let in the oxides or water vapor over years or weeks ? It wouldnt be under vacuum, the components are already hermetically sealed within minutes of degassing. So there would be no pressure differential forcing contaminates inward, it would be a membrane-equilibrium type of mechanism.
Registered Member #64743
Joined: Sat Sept 08 2018, 07:41PM
Location: Canada
Posts: 9
Hygroscopic Resins (i.e. Nylon, ABS, Acrylic, Polyurethane, Polycarbonate, PET, PBT) -Have a strong affinity to attract moisture -Will absorb moisture onto their molecular structure if exposed to ambient air -Internal moisture cannot be removed with hot air alone
PVC is non-hygroscopic and I get mixed data for Polyethylene. I don't know how much moisture before it becomes a problem, it would be the pipe that breaks down first.
Usually there is a vent somewhere to accommodate the oil's thermal expansion/contraction? At a vent site I see desiccant like silica gel, on large utility power transformers.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
wow, that explains alot about 3d printing too.
Ok so maybe i should use fiberglass and contact my epoxy maker. So, next question... how and what do the transformer makers do for the little vent thingie you speak of ? I use a nylon screw and gasket that I loosen and tighten with temperature expansion.
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High vacuum degassing of oil.
