Section 5 Separate machinery spaces * (star) Enhancement
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Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 5 Main and Auxiliary Machinery - Chapter 22 Propulsion and Steering Machinery Redundancy - Section 5 Separate machinery spaces * (star) Enhancement

Section 5 Separate machinery spaces * (star) Enhancement

Parent topic: Chapter 22 Propulsion and Steering Machinery Redundancy

5.1 General

5.1.1 This Section states the additional requirements where propulsion and steering machinery are installed in 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 FMEA required by Pt 5, Ch 22, 2 Failure Mode and Effects Analysis (FMEA) to Pt 5, Ch 22, 4 Control arrangements, together with testing and trials requirements in Pt 5, Ch 22, 6 Testing and trials, are to be complied with in addition to Pt 5, Ch 22, 5.2 Machinery arrangements to Pt 5, Ch 22, 5.7 FMEA.

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 not less 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 Pt 6, Ch 2, 2 Main source of electrical power 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 Pt 5, Ch 22, 3.3 Electrical power supply 3.3.1 are to be arranged in not less 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 essential services, such that propulsion power and steering capability will continue to be available.

5.4 Essential services 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 Pt 5, Ch 22, 3.5 Fuel oil storage and transfer systems and Pt 5, Ch 22, 5.6 Fuel oil storage for fuel oil storage and transfer systems.

5.4.3 Where essential services 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 essential services 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 independent power pumps for bilge drainage are to be located in two separate watertight compartments. Each pump is to be capable of draining any compartment. Means of isolation from other compartments is to be provided.

5.5.2 In addition to the independent power pumps installed to comply with Pt 5, Ch 22, 5.5 Bilge drainage arrangements 5.5.1, an emergency bilge drainage arrangement is to be provided in each main propulsion machinery space.

5.5.3 Each separate machinery compartment is to be provided with at least one independent power pump direct bilge suction.

5.6 Fuel oil storage

5.6.1 The fuel oil service tanks required by Pt 5, Ch 14, 4.18 Fuel oil service tanks 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 Pt 5, Ch 22, 5.4 Essential services for machinery 5.4.2.

5.7 FMEA

5.7.1 The FMEA required by Pt 5, Ch 22, 2.1 General 2.1.1 for the propulsion systems, electrical power supplies, essential services, control systems and steering arrangements 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.

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