My filtration "still"

[uvopowerstroke]

I have a 60 gallon water tank. If I fill it with 50 gallons of UVO the maximum temperature is 120F. If is drain off 10 gallons and get the volume down to 40 gallons the single heater will take it up to 140F. Two days ago I did drain off 10 gallons and did a HPT, it failed again. I let it settle for two days, drained of one cubie of oil, tested again and it failed. I am letting it settle another two more days and will test again. The temperature when I tested on the oil was down to 80F from 140F.

[Fanderson]

Sounds like the oil was probably really wet to begin with. Do you have any reason to believe that the oil might have boil out in it?

I'd try more settling time first to keep it simple. When I get really wet oil (which I try to avoid in the first place), I use vacuum dewatering to dry it out. There are several threads around here on vacuum dewatering. In a nutshell, it helps remove water by lowering the boiling point through vacuum and then sucking it out via a vacuum pump. I heat the oil to 140 - 150F, put a vacuum on the HWH with my pump, then crack open a valve at the top of a standpipe which sucks in air through the bottom of the HWH. I try to trickle it in as slow as possible for about 30 - 60 mins. The oil has always passed the HPT after I do this and send it through my centrifuge.

Some people argue that this technique enhances polymerization, and they're probably right, but it seems to work when I have oil that's really tough to get dry. I just try to avoid wet oil if possible, but it's sometimes tough to tell when you're collecting.

[Snake]

UVO - how long are you letting your oil settle before you try to process it? Can you also please describe how you're doing your HPT?

[djkswiss]

Sorry to hijack, but I think it may add some value to the thread. When are people performing their hot pan tests after heat and settle and before centrifuge with inline heater?

[Snake]

No centrifuge with the still.

[uvopowerstroke]

This oil has been collecting for over 1.5 years approximately 4 cubies per month. I have let is settle the entire time before pouting the top 75% of the cubies into a 5 gallon barrel which has three barrel screens 400 / 200 and 100 microns. I have two sources one is a mainly breakfast type restaurant that makes up a lot of hash browns, fries in the oil. The other is a potatoe chip factory that settles the oil out of the chip remnants. The top of these barrels which have settled for one year are also not passing the HPT before doing the settling and I have not tried this oil through the hot water tank yet.j

To do the hot pan test I heat a frying pan to 320F then introduce a drop of oil to the pan and observe the number of bubbles that show up which usually looks like about a dozen bubbles. If I dump a couple of ounces of oil into the pan their is quite a few bubbles tat show up which heat off.

Not sure what I need to do here to get to dry oil.

[Clay]

Originally Posted by uvopowerstroke

This oil has been collecting for over 1.5 years approximately 4 cubies per month. I have let is settle the entire time before pouting the top 75% of the cubies into a 5 gallon barrel which has three barrel screens 400 / 200 and 100 microns. I have two sources one is a mainly breakfast type restaurant that makes up a lot of hash browns, fries in the oil. The other is a potatoe chip factory that settles the oil out of the chip remnants. The top of these barrels which have settled for one year are also not passing the HPT before doing the settling and I have not tried this oil through the hot water tank yet.j

To do the hot pan test I heat a frying pan to 320F then introduce a drop of oil to the pan and observe the number of bubbles that show up which usually looks like about a dozen bubbles. If I dump a couple of ounces of oil into the pan their is quite a few bubbles tat show up which heat off.

Not sure what I need to do here to get to dry oil.

This should probably be a new thread with its own title to get better response.