A tank battery is a group of tanks that are connected to receive produced water from a well. A tank is normally a single- or double-steel or fiberglass vessel that can hold 200-400 barrels. The tank battery also includes some production equipment, such as gas separators which allow the produced water to be separated from the gas. The produced water is removed from the tanks by truck, and taken to disposal facilities outside of the City.
A device attached immediately above the casing to control the pressure and prevent the escape of fluids from the annular space between the drill pipe and casing or shut off the hole, if no drill pipe is in the hole, should a blowout occur. These devices are pressure tested between 3,500 – 5,000 psi when installed and every two weeks afterwards.