5706.5.16 Securing cargo tanks and tank cars from movement.

Cargo tanks and tank cars shall be secured from movement during loading and unloading operations by setting the cargo tank's or tank car's brakes and by chocking or blocking the wheels. At least two wheel chocks not less than 5 inches by 5 inches by 12 inches (127 mm by 127 mm by 305 mm) in size and dished to fit the contour of the tires shall be used for cargo tanks.

5706.5.17 Vehicle motor.

Motors of cargo tanks or tank cars shall be shut off during the making and breaking of hose connections and during the unloading operation except when unloading is performed with a pump deriving its power from the cargo tank motor.

5706.5.18 Piping, valves, hoses and fittings.

During process transfers, piping, valves, hoses and fittings which are not a part of the cargo tank or tank car shall be designed and installed in accordance with FC 5703.6. Caps or plugs which prevent leakage or spillage shall be provided at all points of connection to transfer piping.