Horizontal & Vertical Quench Tank

Horizontal & Vertical Quench Tank

I had this idea a while back while on coffee break and sketched a quench tank that would accommodate both horizontal and vertical quenching. It was kind of like a piece of pipe with a box welded on top with a lid. I called it the SUPER-TANK(ED) 2000 as a joke.

Fast forward a few months and some trips to the local dump and I had what I needed to make the idea come to life. I found a 20 lb fire extinguisher. I checked with a magnet to make sure it was steel and not aluminum. After unscrewing the valve I noticed there was still a little powder in there which I vacuumed out.

I ran a band of electrical tape around the cap seam, trying to keep it as straight as possible. Then clamped as best  I could the extinguisher body to my table saw.

Using an angle grinder and cutting disc I walked around the top, adjusting the position by un-clamping, rotating and re-clamping as I went.

 There's the inside. The steel walls look like to be about 12 gauge or 0.1". The outside diameter is 7".
I had an old 16" x 12" x 10" electrical enclosure with the mounting pan and door missing and some extra holes drilled in it.

Using a compass I marked a 7" hole in the back of the enclosure.
The red line is where I centered the circle better in the center of the enclosure back. I drilled two 5/16" holes just inside the line.
 Using the jig saw and a good steel cutting blade I walked around the line from hole to hole.
 Voila! Very close to 7" in diameter.
The cut is not perfectly on the line.

So I used a  coarse sanding drum on the cordless drill to clean up the cut.

Here I am test fitting the two pieces. Using the belt sander I cleaned the paint off the top of the fire extinguisher body.

 A small grinding wheel can be used to take the paint off the enclosure. This should be free of paint before welding.
Inside the enclosure I cut the mounting pan studs off with the angle grinder and cutting disc.
 Using the cutting disc again I tool the flange off the door opening of the enclosure.
 Cutting the flange off  leaves a sharp and ragged edge, so it gets some attention with the grinding wheel as well.
 As this enclosure had no lid, I cut a piece of 1/8" cold rolled to fit the opening.
 Tack welded on two hinges 2.5" from the ends.
 Drilled a 7/16" hole 2" up from the bottom. The hole goes through the bottom bell and the side wall, so it's double thick at this spot. About 0.2" thick.
 Tapped with a 1/4" NPT (tapered pipe thread) tap.
 A 1/4" nipple and cap are threaded on with teflon tape to seal the threads.
 I cut and drilled four 1.5" angle iron legs. The holes are drilled to 5/16".
I put the enclosure on the welding bench and pressed the fire extinguisher into the hole. With the welder I went around attempting to seam weld these pieces together. It looked ok, but I applied some silicone from the inside just in case. I also siliconed bolts, washers and nuts to seal any holes.
 For the base I steel framed dolly with some 3/4" MDF wood screwed on to it. The steel frame is made from 1" square tubing. I was lucky enough to get the cross members of the frame to line up with the angle iron legs on on the extinguisher body.

I made a lid stop and pop riveted it on the back (hinge) side. Black spray paint on and added a cool little aluminum cabinet door handle. The lid stop will be screwed in later.

 Once mounted to the base, I added some cool stripe tape.

The enclosure has a grounding stud on the inside where I mounted a dollar store cooking thermometer.
Tightened the drain cap and put in about 9 gallons of water. Checking for leaks. So far so good.

Drained the water out on the grass.
Filled her up with just over 33 litres or about 9 gallons of used turkey fry canola oil. Mmmm smells like Thanksgiving!

The lid stop is from a toggle clamp and can be adjusted up or down.


Unknown said...

Is used motor oil ok for quenching? Thats the only type of oil i can easily have access to

D. Comeau said...

Engine oil is a poor choice for a quenchant. Automatic Transmission Fluid (ATF) is a better choice. I prefer vegetable oil as it doesn't stink so bad, has good heat dissipation, is less toxic and is cheaper than most petroleum based oils. Depending on where you live cheap vegetable oil is about $1 a litre or $4 a gallon. If you are really hard up for cash, talk to some restaurant owners and ask if you can have some of their used oil from their fryers.