Vacuum degassing requirements
Posted: Wed May 10, 2017 10:30 am
Mike,
I don't see the Vacuum chamber in the tools section of your web site anymore, or the pressure chambers either. Am I missing something?
I previously used a makeshift pressure vessel but dismantled it when I moved. I was going to look into a vacuum chamber and pump now that I am trying to gear back up.
How big do I need the chamber? For example, if I expect to degass only 1/4 gallon of material at a time, do I need 1/2 gallon for expansion, 1 gallon for expansion, or do I need a larger one?
What do I need the pump to be able to pull for a vacuum? For example, Standard Pressure at Sea Level is about 30" so I assume that we would want something in excess of 29". Obviously at my current elevation of 4000' I would never get that much (cannot draw more than outside atmospheric pressure).
This seems like a loaded question, but how fast do we need to draw it, or more easily asked, how many Cubic Feet per Minute rating should the pump be rated for? I assume that for a 2 gallon chamber you could do with a much slower pump then a 5 gallon chamber, but still, my experience is that it takes time draw the 29" or more in a larger chamber. Soooo, with a lot of uncertainty in the answer, what is your experience in this?
I don't see the Vacuum chamber in the tools section of your web site anymore, or the pressure chambers either. Am I missing something?
I previously used a makeshift pressure vessel but dismantled it when I moved. I was going to look into a vacuum chamber and pump now that I am trying to gear back up.
How big do I need the chamber? For example, if I expect to degass only 1/4 gallon of material at a time, do I need 1/2 gallon for expansion, 1 gallon for expansion, or do I need a larger one?
What do I need the pump to be able to pull for a vacuum? For example, Standard Pressure at Sea Level is about 30" so I assume that we would want something in excess of 29". Obviously at my current elevation of 4000' I would never get that much (cannot draw more than outside atmospheric pressure).
This seems like a loaded question, but how fast do we need to draw it, or more easily asked, how many Cubic Feet per Minute rating should the pump be rated for? I assume that for a 2 gallon chamber you could do with a much slower pump then a 5 gallon chamber, but still, my experience is that it takes time draw the 29" or more in a larger chamber. Soooo, with a lot of uncertainty in the answer, what is your experience in this?