Article 20 Specified conditions

It shall be a condition of the exemption granted by article 19 that the relevant gas to be supplied to a particular building or structure is stored in not more than 4 transportable containers (“storage containers”) and that each of them contains no more than 47 kilograms of a liquid substance consisting wholly or mainly of relevant gas in a liquid state.

It shall be a further condition of that exemption that, where the relevant gas to be supplied to a particular building or structure may be conveyed thereto from 3 or 4 different storage containers, there is an automatic device, duly maintained, which secures that the relevant gas conveyed to any particular building or structure at any one time is restricted to gas drawn from not more than 2 of those containers.

It shall be a further condition of that exemption that the aggregate length of pipe through which relevant gas may be conveyed from any particular storage container to any particular building or structure does not exceed 3 metres measured from where the pipe leaves the storage container to where it enters the building or structure.