Section 5 Separate machinery spaces * (star) Enhancement
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 5 Separate machinery spaces * (star) Enhancement

Section 5 Separate machinery spaces * (star) Enhancement

Parent topic: Chapter 3 Propulsion and Steering Machinery Redundancy

5.1 General

5.1.1 This Section states the additional requirements where propulsion and steering machinery are installed separate compartments such that, in the event of the loss of one compartment, the ship will retain availability of propulsion power and manoeuvring capability.

5.1.2 The machinery arrangements, control arrangements and Risk Assessment (RA) required by Vol 3, Pt 1, Ch 3, 2 Risk Assessment (RA), together with testing and trials requirements in Vol 3, Pt 1, Ch 3, 6 Testing and trials, are to be complied with in addition to Vol 3, Pt 1, Ch 3, 5.2 Machinery arrangements.

5.2 Machinery arrangements

5.2.1 The main propulsion machinery is to be arranged in not less than two compartments such that, in the event of the loss of one compartment, propulsion power and/or manoeuvring capability will continue to be available, where required by the respective class notations.

5.2.2 The steering systems are to be arranged in no fewer than two separate compartments, such that steering capability will continue to be available in the event of the loss of one compartment, where required by the respective class notations.

5.3 Electrical power supply

5.3.1 The generating sets and converting sets required by Vol 3, Pt 1, Ch 3, 3.3 Electrical power supply 3.3.1 are to be arranged so that they are located in at least two separate machinery compartments.

5.3.2 The independent sections of the switchboard required by Vol 3, Pt 1, Ch 3, 3.3 Electrical power supply 3.3.1 are to be arranged in no fewer than two separate compartments.

5.3.3 In the event of the loss of one compartment, there is to be continuity of sufficient electrical power to supply Mobility and/or Ship Type systems, such that propulsion power and steering capability will continue to be available.

5.4 Mobility and Ship Type systems for machinery

5.4.1 Services essential for the operation of the propulsion machinery, steering and the supply of electrical power are to be arranged, so that propulsion power and steering capability are maintained in the event of the loss of one machinery compartment.

5.4.2 The design of systems which may have a common source, such as those used for supplying fuel oil, lubricating oil, fresh and sea-water cooling, ventilation of compartments and engine starting energy, is to ensure continuous availability of supply in the event of the loss of any one compartment. Where applicable, continuous availability of heating services, fuel oil and water treatments is also to be provided. See Vol 3, Pt 1, Ch 3, 3.5 Fuel oil storage and transfer systems and Vol 3, Pt 1, Ch 3, 5.6 Fuel oil storage for fuel oil storage and transfer systems.

5.4.3 Where Mobility or Ship Type systems are arranged so that they may supply machinery in another compartment, means of isolation from that compartment is to be provided.

5.4.4 Where pumps for Mobility or Ship Type systems are arranged to supply more than one compartment, standby pumps for the same supplies are to be provided in a different compartment. The standby pumps are to be arranged to start automatically if the discharge pressure from the working pumps falls below a predetermined value.

5.5 Bilge drainage arrangements

5.5.1 The drainage arrangements for any machinery space are to be provided with means of isolation from other compartments.

5.6 Fuel oil storage

5.6.1 The fuel oil service tanks required by Vol 2, Pt 7, Ch 3, 4.18 Fuel oil service tanks 4.18.2 are to be located in separate compartments.

5.6.2 Provision is to be made to ensure that fuel oil preparation and transfer arrangements to the fuel oil service tanks are continuously available in the event of the loss of any one compartment, see also Vol 3, Pt 1, Ch 3, 5.4 Mobility and Ship Type systems for machinery 5.4.2.

5.7 Fire containment

5.7.1 Common boundaries separating compartments containing propulsion and/or steering machinery are to be at least ‘A-30’ class divisions.

5.8 Risk Assessment (RA)

5.8.1 The RA required by Vol 3, Pt 1, Ch 3, 2.1 General 2.1.1 for the propulsion systems, electrical power supplies, control systems, steering arrangements and other Mobility and/or Ship Type systems is also to address the following:

  1. Fire in a machinery space or control room.

  2. Flooding of any watertight compartment which could affect propulsion or steering capability.

  3. Separation of machinery spaces.

Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.