Cylinders should, whenever practicable, be stowed upright
with their valves on top and with their protective caps firmly in
place. Cylinders should be adequately secured, so as to withstand
the rigours of the intended voyage, by means of steel strapping or
equivalent means led to lashing points on the container floor. When
cylinders cannot be stowed upright in a closed container, they should
be carried in an open-top or a platform-based container.