Where a consumer uses gas for the purpose of working or supplying plant which is liable to produce pressure fluctuation in the gas supply such as to cause any danger to other consumers, he shall comply with such directions as may be given to him by the transporter of the gas to prevent such danger.
Where a consumer intends to use for or in connection with the consumption of gas any gaseous substance he shall—
and in this paragraph "gaseous substance" includes compressed air but does not include any gaseous substance supplied by the transporter.
Where a direction under paragraphs (1) or (2) above requires the provision of any device, the consumer shall ensure that the device is adequately maintained.
Any direction given pursuant to this regulation shall be in writing.