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55. (1) In every ship in which machinery essential for the propulsion and safety of the ship or of persons on board is required to be started, operated or controlled solely by compressed air there shall be provided at least one independently driven air compressor which shall be of efficient design and of sufficient strength and capacity for the service for which it is intended.
(2) Every ship which is propelled by compression ignition engines designed to start by compressed air shall be provided with at least one air receiver, which shall be of such capacity that, when filled with compressed air, the air contained therein will be sufficient to start each of the ship’s main engines 12 times if such engines are reversible, and six times if such engines are non-reversible.
(3) Every air receiver and air bottle shall be fitted with means of access for purposes of inspection and shall be provided with efficient drains for the removal of oil and water and with efficient relief valves to prevent overpressure. If the air receiver or air bottle can be isolated from the relief valve, it shall be fitted with one or more fusible plugs so as to discharge its contents in the event of fire.