Section 2 Risk Assessment (RA)
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Naval Ships, January 2023 - Volume 3 Additional Class Notations - Part 1 Ship Type Capability - Chapter 3 Propulsion and Steering Machinery Redundancy - Section 2 Risk Assessment (RA)

Section 2 Risk Assessment (RA)

Parent topic: Chapter 3 Propulsion and Steering Machinery Redundancy

2.1 General

2.1.1 A Risk Assessment (RA) is to be carried out in accordance with Vol 2, Pt 1, Ch 3, 18 Risk Assessment (RA) Vol 3, Pt 1, Ch 3, 2.1 General 2.1.2, for the propulsion systems, electrical power supply systems and steering systems to demonstrate that a single failure in active equipment or loss of an associated sub-system, see Vol 3, Pt 1, Ch 3, 1.1 General 1.1.4, will not cause loss of all propulsion and/or steering capability as required by a class notation. Typical sub-systems include associated control and monitoring arrangements, data communications, power supplies (electrical, hydraulic or pneumatic), fuel, lubricating, cooling, etc.

2.1.2 The RA is to establish that in the event of a single failure:

  1. For PSMR and PSMR* notations, that not less than 50 per cent of the installed prime mover capacity and not less than 50 per cent of the installed propulsion systems is available, and that steering capability is retained at a speed of seven knots.

  2. For PMR and PMR* notations, that not less than 50 per cent of the installed prime mover capacity and not less than 50 per cent of the installed propulsion systems remain available.

  3. For SMR and SMR* notations, steering capability at a speed of seven knots is to be retained.

2.1.3 For PSMRL* notation, that the ship will retain the ability to use available installed prime mover capacity and installed propulsion systems that are unaffected by the failure and retain steering capability at a service speed of not less than seven knots.

2.1.4 For PMRL* notation, that the ship will retain the ability to use available installed prime mover capacity and installed propulsion systems that are unaffected by the failure.

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