The MSDS sheet as seen in this link

http://media.photobucket.com/user/Euclid_bucket/media/22017lg.jpg.html?filters[term]=santa&filters[primary]=images&filters[featured_media]=1341&sort=1&o=85

also states used engine oil vapours to be flamable. I had long waited to build a similar device that you made but my vacuum pump is only rated for general purpose air not flamable vapours I don't see any way to dismiss the dangers unless the pump is up to snuff.

I will not say that my setup will never explode. However, the chance of it exploding is less than one in a million.

If any flammable vapors are present they are not concentrated with vacuum but the opposite. As an example in order to condense natural gas into a liquid you have to compress it not put it under vacuum.

... so, in reverse, putting the OIL in a vacuum will separate the LIQUID into a VAPOR... :rolleyes:

Then just add a length of tubing to allow the exhaust from the vacuum with the flammable vapor laden air a distance from the non explosion proof motor and electrical connections. He may have it i will replay the video to see how it exhausts.

Freeze his video at about 0.04 there is tubing from the exhaust side of the vacuum pump. If someone wants to be a little safer and a foot or so. That should allow the vapors to drop below the lower explosive levels even for heavily gas diluted motor oil. It also appears to be outside, if doing it in side of a garage let the exhaust tubing discharge under the closed door to the outside atmosphere.

Definately going in the right direction with removing the exhaust 25 ft at ground or if elevated to 3 feet 10 feet as required by law. But you must consider a failure of the pumps diaphragm or seal in that event will the flammable gases be exposed to a source of ignition? How old is the pump will these fumes break down a seal faster than air? These are all taken into consideration with an intrinsically rated pump.

Boiling point of motor oil is 570 F. Being under 25" HG vacuum reduces the boiling point by some amount. By how much IDK off hand but it can be looked up. A rough guess is less than 70F.

If 570- 70 = 500F is the motor oil's boiling point in the tank under 25" HG, that means the oil remain as a liquid and not change to vapor.

An explosion requires a flammable substance + oxygen in a confined space. Even if there is a flammable substance in the tank, there is no oxygen since it is under vacuum and the oxygen has been evacuated, an explosion cannot occur inside the tank.

Outside the tank, there is oxygen, but there is no confined space. Even if there is a flammable substance (which there isn't), an explosion cannot occur. It will simply burn (like a torch), if somehow it got ignited.

You are worrying about nothing.

if you are considered about oil vapor in this tank exploding then how come your engine does not explode from it if the vent tube gets a bit clogged - the blow by contains a fair amount of oil vapor.

Where in the tank would be the ignition source ?? Oil flow sure wont provide it !!

Leave him alone guys. There is no harm in warnings on the Internet.

All you have to do is just ask yourself every time you go to change your oil would it be ok it put an open flame on the intake of the vacuum tank. If you answered no then why take the chance with a pump that is not rated for the application. The point of ignition during a drawdown would be at the DC motors contacts then travel to greater concentrations and naturally be sucked into that tank.

Bang that's my take from experience.

Thank you for the warnings. Anybody attempting this procedure please realize that conditions could exist for a fire or explosion. Proceed at your own risk.:eek:

Leave him alone? :confused: Are we allowed to ask him questions?

It depends on the liquid. engine oil, diesel, no. gasoline and low boiling point fuels, yes

Boiling Point - Fuels

Boiling point of Mobil 1 5W40 is 600F

http://s7d9.scene7.com/is/content/GenuinePartsCompany/1498139pdf?$PDF$