Summary of Regulations

1) The main steering and rudder stock shall be of adequate strength and capable of putting the rudder over from 35° on one side to 35° on the other side with the ship at its deepest seagoing draught and running ahead at maximum ahead service speed and, under the same conditions, from 35° on either side to 30° on the other side in not more than 28 seconds.

2) The auxiliary steering gear shall be of adequate strength and capable of steering the ship at navigable speed and of being brought speedily into action in an emergency: % must be capable of putting the rudder over from 15° on one side to 15° on the other side in not more than 60 seconds with the ship at its deepest seagoing draught and running ahead at one half of the maximum ahead service speed or 7 knots, whichever is the greater.

3) Main and auxiliary steering gear power units shall be arranged to restart automatically when power is restored after a power failure and capable of being brought into operation from a position on the navigation bridge. In the event of a power failure any one of the steering gear power units, an audible and visual alarm shall be given cat the navigation bridge.

4) Steering gear control shall be provided for the following:

a) The main steering gear, both on the navigation bridge and in the steering gear compartment;

b) The auxiliary steering gear, in the steering gear compartment and, if power-operated, it shall also be operable from the navigation bridge and shall tar independent of the control system for the main steering gear.

5) Any main and auxiliary steering gear control system operable from the navigation bridge shall comply with the following:

a) If it is electric, it shall be served by its own separate circuit supplied from a steering gear power circuit from a point within the steering gear compartment, or directly from switchboard busbars supplying that steering gear power circuit at a point on the switchboard adjacent to the supply to the steering gear power circuit;

b) means shall be provided in the steering gear compartment for disconnecting any control system operable from the navigation bridge from the steering gear it serves;

c) the system shall be capable of being brought into operation from a position on the navigation bridge;

d) in the event of a failure of electrical power supply to the control system, an audible and visual alarm shall be given on the navigation bridge; and

e) short circuit protection only shall be provided for steering gear control supply circuits.

6)The electrical power circuits and the steering gear control systems with their associated components, cables and pipes required shall be separated as far as is practicable throughout their length.

7)The angular position of the rudder, independent of the steering gear control system shall be recognizable in the steering gear compartment and if the main steering gear is power-operated, be indicated on the navigation bridge.

8) A low-level alarm for each hydraulic fluid reservoir must give the earliest practicable indication of hydraulic fluid leakage. Audible and visual alarms shall be given on the navigation bridge and in the machinery space where they can be readily observed,

9) Every tanker, chemical tanker or gas carrier of 10,000 gross tonnage and upwards shall comply with the following:

a) two independent steering gear control systems shall be provided each of which can be operated from the navigation bridge. This does not require duplication of the steering wheel or steering lever;

b) if the steering gear control system in operation fails, the second system shall be capable of being brought into immediate operation from the navigation bridge; and

c) each steering gear control system, if electric, shall be served by its own separate circuit supplied from the steering gear power circuit or directly from switchboard busbars supplying that steering gear power circuit at a point on the switchboard adjacent to the supply to the steering gear power circuit.

10) Means for indicating that the motors of electric and electrohydraulic steering gear are running shall be installed on the navigation bridge and at a suitable main machinery control position.

11) Each electric or electrohydraulic steering gear comprising one or more power urns shall be served by at least two exclusive circuits fed directly from the man switchboard; however, one of the circuits may be supplied through the emergency switchboard.

12) An auxiliary electric or electrohydraulic steering gear associated with a main electric or electrohydraulic steering gear may be connected to one of the circuits supplying this main steering gear. The circuits supplying an electric or electrohydraulic steering gear shall have adequate rating for supplying all motors which can be simultaneously connected to them and may be required to operate simultaneously.

13) Short circuit protection and an overload alarm shall be provided for such circuits and motors. Protection against excess current, including starting current, if provided shall be for not less than twice the full load current of the motor or circuit so protected, and shall be arranged to permit the passage of the appropriate starting currents. Where a three-phase supply is used an alarm shall be provided that will indicate failure of anyone of the supply phases. The alarms required in this paragraph shall be both audible and visual and shall be situated in a conspicuous position in the main machinery space or control room from which the main machinery is normally controlled and as may be required by Regulation 51.

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