We’ve had some problems with the pipes in our shop getting clogged from the bits of oil that get drained with our wash water. After a few too many trips from the plumber, we decided that it’s time that we installed a grease trap. Grease traps are expensive, so with a little ingenuity and some help from the internet, we developed our own.
The design is really quite simple. Water flows in from one end and enters the polyethylene tank, water then settles to the bottom while grease rises to the top, and clean(er) water leaves the tank, flowing into the drain. The whole system can be made for under $70 whereas one would normally spend around $300 for a trap that’s pre-fabricated. It was assembled from parts ordered from US Plastic and random plumbing parts that we had in the shop. When constructing one of these, you want to be more concerned with having a large surface area that the water can be exposed to rather than having a deep tank. Our size tank is appropriate for an inlet flow of approximately 4 gallons per minute. The trap is fed by a garden hose that’s draining our 100 gallon wash tank. If you have a similar set-up, this size trap should work for you too. US Plastics sells this model bin in several different sizes, so if you need to change the size to accommodate your shop, that’s a definite option. The parts that we ordered are:
Blue Dividable Grid Container (22 1/2 x 17 1/2 x 12 ), $19.22, item # 52562
Clear Cover for 22 1/2" Containers, $6.91, item # 52959
(quantity:2) 2" Tank Fitting (Double), $10.51, item # 7919
The rest of the parts needed for this project would be some 2” PVC piping and whatever parts that are required to connect to your water source and drain. Once the project is complete, you’re going to want to make sure that you periodically empty the oil from the top of your trap.
This really is a great and easy project. Not only does it save your pipes from clogging, but it also helps out the environment by keeping nasty stuff from getting into the water.
Thnaks for sharing this idea. Simple, economical and environmentally sound.
Two things that I should have included in the overall project description are that you should use some type of sealant around the tank fittings and that the inlet should be located at least an inch above the outlet. This way, the outlet is less likely to suck up oily water.This message has been edited. Last edited by: D'son BioD,
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