In an oil interceptor using a gravity draw-off system, the draw-off sleeve terminal should be set above the normal water line by how much?

In an oil interceptor using a gravity draw-off system, the draw-off sleeve terminal should be set above the normal water line by how much?

• A. 1/4 Inch
• B. 1/2 Inch
• C. 3/4 Inch
• D. 1 Inch

Answer: (B)

In an oil interceptor, you want the draw-off to pull primarily oil that floats on top of the water, not the water itself. By placing the draw-off sleeve terminal a small distance above the normal water line, the outlet stays in the oil layer even as levels fluctuate, so water isn’t drawn off with the oil. The typical, practical setting used is a half-inch above the normal water line. If the gap is too small, water can be pulled into the outlet; if it’s too large, the system may not draw oil efficiently or could require more maintenance.

In an oil interceptor, you want the draw-off to pull primarily oil that floats on top of the water, not the water itself. By placing the draw-off sleeve terminal a small distance above the normal water line, the outlet stays in the oil layer even as levels fluctuate, so water isn’t drawn off with the oil. The typical, practical setting used is a half-inch above the normal water line. If the gap is too small, water can be pulled into the outlet; if it’s too large, the system may not draw oil efficiently or could require more maintenance.