Section 5 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 2 Water Jet Systems - Section 5 Control and monitoring

Section 5 Control and monitoring

Parent topic: Chapter 2 Water Jet Systems

5.1 General

5.1.1 In addition to this Section, the control engineering systems are to comply with Pt 16, Ch 1 Control Engineering Systems.

5.1.2 Steering control for the water jet is to be provided at the ship’s normal conning stations.

5.1.3 For water jets used as the only means of propulsion and steering, a standby or alternative power source for the actuating device, that controls the angular position and/or the reversing angle, is to be provided. Automatic start of the standby pump supplying hydraulic power for steering and reversing is to be provided.

5.1.4 Means are to be provided at each control station to stop each water jet.

5.2 Monitoring and alarms

5.2.1 In addition to the requirements of Pt 14, Ch 1 Steering Systems, alarms and monitoring requirements are indicated in Pt 12, Ch 2, 5.2 Monitoring and alarms 5.2.2 and Table 2.5.1 Alarms.

Table 2.5.1 Alarms

Item Alarm Note
Hydraulic system pressure Low -
Hydraulic oil supply tank level Low -
Hydraulic oil temperature High Where an oil cooler is fitted
Lubricating oil temperature High  
Lubricating oil pressure Low In forced lubrication systems
Lubricating oil tank level Low Where a tank is provided
Ratio of jet rpm/vessel speed High Only if installed power per jet > 4 MW
Control system failure Fault Includes follow-up failure of steering or reversing system
Control system power supply Failure  

5.2.2 An indication of the angular position of the nozzle is to be provided at each station from which it is possible to control the direction of thrust from the units.

5.2.3 An indication of both the required and actual reversing bucket position is to be provided at each station from which it is possible to control the reversal of thrust.

5.2.4 All alarms associated with water jet unit faults are to be indicated individually at the control stations and in accordance with the alarm system specified by Pt 16, Ch 1 Control Engineering Systems.

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