Section 6 Control and monitoring
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Special Service Craft, July 2022 - Part 12 Propulsion Devices - Chapter 3 Thrusters - Section 6 Control and monitoring

Section 6 Control and monitoring

Parent topic: Chapter 3 Thrusters

6.1 General

6.1.1 Except where indicated in this Section the control engineering systems are to be in accordance with Pt 16, Ch 1 Control Engineering Systems.

6.1.2 Azimuthing control for azimuth thruster(s) and propeller pitch control for azimuth and/or tunnel thruster(s) are to be provided from the navigating bridge, the main machinery control station and locally.

6.1.3 Means are to be provided at the remote control station(s) to stop each azimuth or tunnel thruster unit.

6.2 Monitoring and alarms

6.2.1 Alarms and monitoring requirements are indicated in Pt 12, Ch 3, 6.2 Monitoring and alarms 6.2.2, Pt 12, Ch 3, 6.2 Monitoring and alarms 6.2.3 and Table 3.6.1 Alarms.

Table 3.6.1 Alarms

Item Alarm Note
Thruster, azimuth or tunnel - Indicators, see Pt 12, Ch 3, 6.2 Monitoring and alarms 6.2.2
Azimuthing motor Power failure, single phase Also running indication on bridge and at machinery control station
Propeller pitch motor Power failure 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 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 pressure Low If separate forced lubrication

6.2.2 An indication of the angular position of the azimuth thruster(s) and the propeller pitch position for azimuth and/or tunnel thruster(s) are to be provided at each station from which it is possible to control the direction of thrust or the pitch.

6.2.3 All alarms associated with thruster unit faults are to be indicated individually on the navigating bridge and in accordance with the alarm system specified by Pt 16 Control and Electrical Engineering.

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