Abstract: An elongate, closed, fiberglass tank of round or oval cross-section is mounted horizontally on a truck frame. An opening is provided in the bottom portion of the tank wall. A fiberglass sump projects downwardly from the opening and is joined with the bottom wall portion along the periphery of the opening. Liquid may drain from the tank compartment through the opening into the sump. The sump has a generally vertical wall segment at one end. The wall segment faces sideways and forms an outlet. The outlet is positioned above the rails of the truck frame. A discharge assembly, comprising a valve and piping, is connected to the vertical wall segment, communicates with the outlet and extends horizontally above the frame to the side of the tank. By incorporating this design, the tank can be positioned close to the frame and its discharge assembly still remains clear of the frame. The center of gravity of the tank is relatively low and the truck is less likely to overturn.

Abstract: The disclosure describes a tank for separating water and hydrocarbon fuels from contaminated water which comprises an elongated vessel having, at one end thereof, an inlet for delivering contaminated water into the vessel. A distribution baffle is mounted at this end of the vessel for directing the incoming flow of contaminated water into multiple streams thereby reducing the incoming turbulent flow into a laminar flow whereby water is directed towards the opposite end of the vessel in an unobstructed manner so that light hydrocarbon fuel droplets may be allowed to rise and be collected on the surface of the water. A outlet piping is providing at the opposite end of the vessel for discharging water free of hydrocarbon fuels.