The exterior surfaces of aboveground storage tanks and piping shall be protected by a suitable coating which prevents corrosion and deterioration. The coating system shall be maintained throughout the entire operational life of the tank.
25 Pa. Code § 245.533
This section cited in 25 Pa. Code § 78a.57 (relating to control, storage and disposal of production fluids); and 25 Pa. Code § 245.521 (relating to performance standards for aboveground storage tanks).