Oil Traps or Interceptor 

Oil interceptors are designed for use in drain lines where oils, sediment and other liquids are found. These drain lines may be from areas in parking garages, machine shops, service stations, aircraft hangars, industrial and manufacturing facilities, etc., and all need an environmentally sensible way to drain off. For an effective, durable way to drain, try a Zurn oil interceptor.

Oil Interceptors & How They Operate

The solid baffle plate opposite the inlet to the oil interceptor diffuses the flow into the interceptor and lessens the turbulence of the oil-laden water as it enters the intercepting chamber. Solids and sludge carried in the water are stopped by the baffle and collected in the solids retaining bucket between the inlet and the flow-retarding baffle. Such accumulation can then be removed. The resulting quiet, even flow of water through the interceptor permits the oils and other light density substances to rise to the surface by the “flotation” principle of separation. Oils are lighter than water, therefore gravity causes the oil to rise to the surface of the water. Maximum separation and interception is affected in proportion to the elimination of turbulence of wastewater within the interceptor. The unique baffle/bucket design permits almost 90 percent of the interior of the interceptor to be used for the function of oil separation. They are constructed of 100% steel for long lasting performance and durability.

Installation Considerations:

Install the interceptor in the building sewer line. The interceptor may be set on the floor, partially recessed in the floor, top flush with the floor, or fully recessed below the floor to suit piping and structural conditions. All Zurn oil interceptors with oil level sensors must be installed sitting on the floor or recessed in a pit. Pit installations require the pit be kept dry by means of a drain or sump pump. Be sure to anticipate sufficient clearance for removal of interceptor cover for cleaning. Also take into consideration the placement of flow control fittings, vent requirements, and draw-off piping. All oil interceptors must be vented to the atmosphere.

These Interceptors are great for commercial and industrial applications such as: filling and service stations, maintenance garages, auto shops, airport hangars, carwashes, laundries and cleaning establishments, parking facilities, wash down areas, machine shops, refineries, fabrication and welding plants, foundries, electrical substations or anywhere oil can be spilled and possibly leak into a sanitary drain system.


These oil interceptors feature

Fabricated steel construction with an acid resistant epoxy coat on the interior and exterior, bronze cleanout plug, visible double wall trap seal, removable combination pressure equalizing/flow diffusing baffle and sediment bucket, horizontal baffle, adjustable oil draw-off and vent connections either side, secured gasketed non-skid cover complete with flow control fitting and a threaded inlet and outlet. Note: Location of outlet from bottom of interceptor cannot be changed.

This Zurn Z1186 oil interceptor is furnished with a 1-1/2″ NPT adjustable oil draw-off assembly. Since oils are lighter than water, gravity causes the oil to rise to the surface of the water. The oil draw-off assembly allows the separated oils, and other similar light density substances, to be automatically drained out through a properly adjusted internal stand pipe. A pipe connection from the internal adjustable standpipe is connected to an oil drain line leading from the oil interceptor to an oil storage tank. The standpipe sleeve (brass tube) must be adjusted so the opening is 1/8″ above the top of the normal water flow level in the interceptor chamber. The oil that floats to the surface will drain off by gravity flow as waste water flows through the interceptor. When the adjustable sleeve in the standpipe is correctly set, no water will drain off with the oil. There is no need for any manual skimming of the oil.

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