Valves in Drawing-Off Pipes. All drawing-off pipes terminating inside of any building, shall have an automatically closing type shutoff valve or dead-man switch to control pump and an emergency valve at the point of discharge.
Valves for Aboveground Tanks Below Liquid Level. All aboveground tanks shall have a valve in the discharge pipe leading from such tank which shall be located within two feet of the tank, with no branches or outlets between the tank and valve. All inlet pipes shall have a tank valve and shall have a check valve immediately adjacent to the tank valve. Where a pair of valves are used in a pipe line aboveground, a relief valve or a relief bypass valve shall be provided in each line and discharge into the top of the tank or a properly installed underground tank. Relief valves shall be of sufficient size to prevent excessive pressure in the pipe line and in no case shall the relief valve be set at a higher pressure than the maximum working pressure of the pipe. Pipes leading into or out of a diked area shall have an additional valve within ten feet of the dike, except no valves will be required in aboveground pipe lines when such pipes are used for conserving vapor losses and piped to an expanding roof tank.
All valves shall have identification tags, stating the use of the valve and the material that is conveyed. Tags shall be of the stamped metal type and not less than one-fourth-inch lettering used. Tags shall be permanently fixed to the valve. All piping shall be labeled stating material conveyed or flammable liquid and its class. The direction of the normal flow shall be clearly shown.
Pipe Drain to Tanks. Where underground tanks are used, vent, fill, and suction lines shall pitch toward the tank without traps or pockets. Suction piping entering a building from an underground tank, shall be equipped with an approved antisyphon device when said pipe is installed below, or may fall below the highest level of the tank.
Pipes in Rooms Containing Open Flames. Pipes conveying Class I or II flammable liquid, shall not extend into or pass through any room which contains open light or fire, unless said pipes are of standard full weight wrought iron, steel or extra heavy wrought steel pipe (ASTM Schedule 80) are without threaded joints or connection.
(Prior code § 129.1-40)