Section 2 Performance requirements
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 9 Electrotechnical Systems - Chapter 7 Control, Alerts and Safety Systems - Section 2 Performance requirements

Section 2 Performance requirements

Parent topic: Chapter 7 Control, Alerts and Safety Systems

2.1 Performance requirements

2.1.1 The design, construction and operation of control, alert and safety systems shall employ human-centred activities.

2.1.2 Mobility systems for propulsion and manoeuvring, electrical power generation, and safety of the ship shall be provided with a continuous electrical supply. An audible and visual alert shall be initiated in the event of the failure of any of the power supplies.

2.1.3 The control system must operate Mobility and/or Ship Type systems in a safe, controlled and stable manner throughout the machinery's/systems’ defined operational limits and shall recover automatically in a safe manner after a loss of power supply.

2.1.4 It shall be possible to control machinery/systems from only one location at a time, with clear indication showing the location of the control. Transfer between control stations without altering the control set points shall be provided. Transfer of control location will be indicated with visual and audible indication.

2.1.5 Appropriate indication and feedback shall be provided at each control station to confirm that the system has responded to the Operator’s demands. The status of automatic control systems shall be indicated.

2.1.6 Means are to be available to disable the automatic or remote control operation of Mobility and/or Ship Type systems to allow inspection and maintenance tasks to be performed safely on the machinery and systems.

2.1.7 Indications of impending slowdown/shutdown of Mobility and/or Ship Type systems shall be provided at applicable locations with provision to take alternative actions if approved.

2.1.8 Automated control systems which utilise stored energy to start Mobility and/or Ship Type machinery shall be configured not to exhaust the stored energy completely and to provide an alert when the stored energy is below a critical limit.

2.1.9 The monitoring system for system parameters is to have integrity appropriate for its intended purpose.

2.1.10 Where it is proposed to operate the Mobility or Ship Type machinery in an unattended space, no matter what period, sufficient controls, alarms and safeguards are to be provided to enable safe and effective operation of the equipment. A dedicated control position shall be provided.

2.1.11 Failure of a control system is not to result in the loss of ability to provide either Mobility or Ship Type systems by alternative means.

2.1.12 Control, Alert and Safety systems shall be designed to fail to the least hazardous condition. This condition shall be determined for the complete installation.

2.1.13 Operators shall have an independent, high integrity method to disconnect all energy sources that shall put machinery for Ship Type safety functions into a known safe state.

2.1.14 An alert system with appropriate controls and displays shall be located at key locations.

2.1.15 Where parameters of the alert system can be adjusted, the integrity of the system shall be maintained.

2.1.16 The status of an alert shall be clearly visible and a means to accept it from all appropriate locations. Visual indication of the alarm shall remain until the fault is cleared.

2.1.17 Design of machinery safety systems shall be such that equipment must be reset manually before being restarted.

2.1.18 Where the function of a safety system might lead to a greater hazard than the loss of the equipment, an override should be provided.

2.1.19 The status of standby machinery and systems shall be indicated at appropriate control stations as agreed with the Naval Administration.

2.1.20 Systems shall be readily usable under all intended operating conditions and shall support effective and efficient operation. Adequate safeguards against incorrect operation shall be provided.

2.1.21 The systems’ repeatability and accuracy shall be adequate for the proposed use and shall be maintained at their specified value during their expected lifetime and normal use.

2.1.22 System design shall take account of any constraints or limitations imposed due to equipment or machinery.

2.1.23 Where the system design intent includes ‘darken ship’ capability, the controls and alerts are to be arranged to support safe operation in this state.

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