(4) Connect ground wire to tank cars and truck
trailers before any unloading or loading operation is started.
(5) Wear rubber (neoprene) gloves when gauging
tank cars, truck trailer, and storage tanks and when performing
(6) Keep vapor or liquid off skin and clothing.
Liquid in contact with skin produces the same injury as a freeze
(7) Thorough ventilation is required in
buildings, especially at floor level.
Use spark proof tools and explosion proof
(9) Open valves slowly. If excess flow valves
are closed, they may be opened by closing the line discharge
valve for a few minutes, thus permitting pressure above and
below excess flow valve to equalize internally through the small
hole provided for this purpose, enabling the excess flow valve
disk to drop into the open position.
(10) The coefficient of thermal expansion of the
liquefied gas is high, therefore, liquid should not be confined
in any isolated section of pipe except where a pressure relief
valve is provided.
(11) Do not overfill storage tanks. The maximum
allowable fill is 80 percent full, refer to NFPA 58 for exact
(12) Do not pressurize tank cars above the safety
valve setting as stenciled on the car. If faulty equipment on
the car prevents normal unloading do not loosen or remove car
valves under any circumstances. Fill in "Bad Order Tag" and
attach to defective car part. Inform firefighting school
supervisor of defective car and await further instructions on
disposition of the car.
(13) Bleed vapor and liquid unloading and loading
hoses before uncoupling from tank cars or truck transports.