A gravity settling tank is to be used to clean waste water from an oil refinery. The waste water contains 1% by volume of oil droplets ranging in size from 100 to 1000 microns which will be removed from the water before the latter is discharged to a nearby river. The tank is of rectangular section 2 ft wide and 4 ft deep with provisions for smooth continuous discharge if clean water and skimming off of oil at the surface of the discharge end. If 10,000 gallons per minute of waste water is to be cleaned of oil droplets, specific gravity of oil is 0.87. Calculate the required length of the settling tank.

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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A gravity settling tank is to be used to clean waste water from an oil refinery. The waste water
contains 1% by volume of oil droplets ranging in size from 100 to 1000 microns which will be
removed from the water before the latter is discharged to a nearby river. The tank is of
rectangular section 2 ft wide and 4 ft deep with provisions for smooth continuous discharge if
clean water and skimming off of oil at the surface of the discharge end. If 10,000 gallons per
minute of waste water is to be cleaned of oil droplets, specific gravity of oil is 0.87. Calculate the
required length of the settling tank.

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