jkidd, your vacuum method sounds like the supper sucker people have been discussing. It is just a way to move sludgy oil, but not a way to clean it up. Yes, people here do heat their oil to de-water it and thin it out for filtering and centrifuging; however, those who blend have found blending first, then settling for 3 days saves a lot of effort, as KMakar is demonstrating how hard one can work on cleaning up waste oil doing it the hard way.I'm only applying knowledge I have on transformer refurb.. what is a "RUG"? I'm not talking about alot of heat but even heating it up to 90-120 degrees would help alot.
By putting the mixture under vacuum you can pull it out contaminates. This is more for pulling all the contamination out of the transformer can. If you are using a centrifuge to get out contamination I'd say you are gonna remove a boat load. I would try to get the mixture as thin as possible buy filtering it at the highest temp possible w/out the danger of fire..
When we press a unit we will suck the oil from the bottom of the transformer thru a clay bar which removes the moisture/water and then thru a filter then back into the top of the transformer. We heat it up to 190 degrees. You don't wanna stand on top of it haha..
Good to have you on here, but most of us are blending gasoline (RUG) with our waste oil blends anyway, and most of us have found that blending gasoline with waste oil forces water and particulate out of solution rapidly, so we blend it first, then settle, then we drain most of the water and particulate off before filtering and/or centrifuging.My buddy showed me this thread and I thought it was neat.