Regulation 21

Main propulsion, control, steam pipe, fuel oil, compressed air and electrical systems; auxiliary machinery; boilers and other pressure vessels, piping and pumping arrangements; steering equipment and gears, shafts and couplings for power transmission shall be designed, constructed, tested, installed and serviced to the satisfaction of the Certifying Authority and shall be protected so as to reduce to a minimum danger to persons on board. Special attention shall be paid to moving parts, hot surfaces and other dangers. (2) Machinery spaces shall be so designed as to provide safe and free access to all machinery and its controls and to any other part which may require servicing. Such spaces shall be adequately ventilated. Provided that the Certifying Authority may, having regard to overall safety considerations, accept a partial reduction in capability in lieu of full normal operation. (3) ( a ) Means shall be provided whereby the operational capability of the propulsion machinery can be sustained or restored even though one of the essential auxiliaries becomes inoperative. Special consideration shall be given to the functioning of —

the arrangements which supply fuel oil pressure for main propulsion machinery; (ii) the normal sources of lubricating oil pressure; (iii) the hydraulic, pneumatic and electrical means for the control of main propulsion machinery including controllable pitch propellers; (iv) the sources of water pressure for main propulsion cooling systems; and (v) an air compressor and an air receiver for starting or control purposes: Provided that the Certifying Authority may, having regard to overall safety considerations, accept a partial reduction in capability in lieu of full normal operation. ( b ) Means shall be provided whereby the machinery can be brought into operation from the dead ship condition without external aid. (4) Special consideration shall be given to the design, construction and installation of propulsion machinery systems so that any mode of their vibrations shall not cause undue stresses in such machinery systems in the normal operating ranges. (5) The design and construction of electrical installations shall be such as to provide — ( a ) the services necessary to maintain the ship in normal operational condition without having recourse to an emergency source of power; ( b ) the services essential to safety when failure of the main source of electrical power occurs; and ( c ) protection of the crew and ship from electrical hazards. (6) In ships fitted with periodically unattended machinery spaces, documentary evidence of their fitness to operate in such mode shall be submitted to the Director.