Oil/Water Separators

[RedBauer]

I have a project with a maintenance garage floor drains discharging directly to the sanitary sewer. According to the Town sewer ordinance and plumbing code, an oil/water separator is required prior to discharging to the sewer. Did some research, called reps, etc. Found a wide variety of oil/water separators and oil/sand separators. Seems like I just need a oil/sand separator (basically a tank with baffles) for gravity discharge to sanitary sewer. Does anyone see any cons to using a simple concrete tank (one piece, say 1,000 gal), w/ booted pipe connections, risers for access during cleaning, baffles, and outlet pipe tee'd to the bottom of the tank? Seems like the most cost effective, simple solution for a maintenance garage with minimal flow.

 

[Ron]

That is a basic design of early oil-water separators....baffles and decanting from below the probable oil surface. Vertical baffles will help with stilling, while horizontal baffles with perforations will help with top oil isolation.

 

[bimr]

Probably less expensive to buy a prefabricated one.

http://www.oldcastleprecast.com/pla...ents/a5a53bca-e527-41cf-863a-fcf23f5d228a.pdf

 

[cvg]

1,000 gallon seems a bit overkill for a garage floor drain

 

[HuntPA]

Several manufacturers have engineered units specifically for these applications. By the time you figure out the maintenance (cleaning as needed and required by the town), installation, and other costs; getting a unit designed specifically for the purpose is generally a lot cheaper and easier. Also, they are a lot smaller than 1,000 gallons.

I have specified Zurn units in the past with good results.