Section 4 Control engineering arrangements
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 5 Main and Auxiliary Machinery - Chapter 20 Azimuth Thrusters - Section 4 Control engineering arrangements

Section 4 Control engineering arrangements

Parent topic: Chapter 20 Azimuth Thrusters

4.1 General

4.1.1 Except where indicated in this Section the control engineering systems are to be in accordance with Pt 6, Ch 1 Control Engineering Systems.

4.1.2 Steering control is to be provided for the azimuth thrusters from the navigating bridge, the main machinery control station and locally.

4.1.3 An indication of the angular position of the thruster(s) and the magnitude of the thrust are to be provided at each station from which it is possible to control the direction of thrust.

4.1.4 Means are to be provided at the remote control station(s) to stop each thrust unit.

4.2 Monitoring and alarms

4.2.1 Alarms and monitoring requirements are indicated in Pt 5, Ch 20, 4.2 Monitoring and alarms 4.2.2 and Table 20.4.1 Alarms for control systems.

Table 20.4.1 Alarms for control systems

Item Alarm Note
Thruster azimuth - Indicator, see Pt 5, Ch 20, 4.1 General 4.1.3
Steering motor Power failure, single phase Also running indication on bridge and at machinery control station
Propulsion motor Overload, power failure Also running indication on bridge and at machinery control station
Control system power Failure  
Hydraulic oil supply tank level Low  
Hydraulic oil system pressure Low  
Hydraulic oil system temperature High Where oil cooler is fitted
Hydraulic oil filters differential pressure High Where oil filters are fitted
Lubricating oil supply Low If separate forced lubrication

4.2.2 The alarms described in Table 20.4.1 Alarms for control systems are to be indicated individually on the navigating bridge and in accordance with the alarm system specified by Pt 6, Ch 1, Pt 6, Ch 1, 2.3 Alarm systems, general requirements.

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