Section 4 Steering control systems
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, July 2022 - Part 5 Main and Auxiliary Machinery - Chapter 19 Steering Gear - Section 4 Steering control systems

Section 4 Steering control systems

Parent topic: Chapter 19 Steering Gear

4.1 General

4.1.1 Steering gear control is to be provided:
  1. For the main steering gear, both on the navigating bridge and in the steering gear compartment;
  2. Where the main steering gear is arranged according to Pt 5, Ch 19, 2.1 General 2.1.4, by two independent control systems, both operable from the navigating bridge. This does not require duplication of the steering wheel or steering lever. Where the control system consists of a hydraulic telemotor, a second independent system does not need to be fitted, except in a oil storage unit of 10000 gross tonnage and upwards;
  3. For the auxiliary steering gear, in the steering gear compartment and, if power-operated, it shall also be operable from the navigating bridge and is to be independent of the control system for the main steering gear; and
  4. Where the steering gear is so arranged that more than one control system can be simultaneously operated, the risk of hydraulic locking caused by single failure is to be considered.
4.1.2 Any main and auxiliary steering gear control system, operable from the navigating bridge, is to comply with the following:
  1. Means are to be provided in the steering gear compartment for disconnecting any control system operable from the navigating bridge from the steering gear it serves;
  2. The system is to be capable of being brought into operation from a position on the navigating bridge.
4.1.3 The angular position of the rudder shall:
  1. Be indicated on the navigating bridge, if the main steering gear is power-operated. The rudder angle indication is to be independent of the steering gear control system;
  2. Be recognisable in the steering gear compartment.

4.1.4 Appropriate operating instructions with a block diagram showing the changeover procedures for steering gear control systems and steering gear actuating systems, which are to be permanently displayed in the wheelhouse and in the steering gear compartment.

4.1.5 Where the system failure alarms for hydraulic lock, see Table 19.5.1 Alarm requirements, are provided, appropriate instructions shall be placed on the navigating bridge to shut down the system at fault.

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