Section 9 Control and monitoring
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Naval Ships, January 2023 - Volume 2 Machinery and Engineering Systems - Part 3 Transmission Systems - Chapter 1 Gearing - Section 9 Control and monitoring

Section 9 Control and monitoring

Parent topic: Chapter 1 Gearing

9.1 General

9.1.1 Control engineering systems are to be in accordance with Vol 2, Pt 9, Ch 7 Control, Alerts and Safety Systems

9.1.2 All main and auxiliary gear units, intended for Mobility and/or Ship Type systems, are to be provided with means of indicating the lubricating oil supply pressure. Audible and visual alarms are to be fitted to give warning of an appreciable reduction in pressure of the lubricating oil supply. These alarms are to be actuated from the outlet side of any restrictions, such as filters, coolers, etc.

9.2 Unattended machinery

9.2.1 Where the machinery is fitted with automatic or remote controls so that under normal operating conditions it does not require any manual intervention by the operators, gear units are to be provided with alarms and safety arrangements required by Vol 2, Pt 3, Ch 1, 9.2 Unattended machinery 9.2.2 and Table 1.9.1 Alarms and safeguards. The sensors and circuits utilised for the second stage alarm and automatic shutdown in Table 1.9.1 Alarms and safeguards are to be independent of those required for the first stage alarm.

Table 1.9.1 Alarms and safeguards

Item Alarm Note
Lubricating oil sump level Low –
Lubricating oil inlet pressure* 1st Stage Low Slow-down of prime mover
Lubricating oil inlet pressure* 2nd Stage Low Automatic shutdown of prime mover
Lubricating oil inlet temperature* High –
Thrust bearing temperature* High Slow-down of prime mover

Note Where the prime mover is an electric motor then this is to be fitted with a means of reducing speed to enable compliance with this Table. Where gearboxes use an external oil tank for the lubricating oil supply then this is to be considered as the sump.

9.2.2 Where the gear unit is required to be provided with a standby pump, the standby pump is to start automatically if the discharge pressure from the working pump falls below a predetermined value.

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