Section 1 Scope
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 1 Scope

Section 1 Scope

Parent topic: Chapter 1 Gearing

1.1 Application

1.1.1 This Chapter, defines the requirements for the design and service life of marine gears and is to be read in conjunction with the General Requirements for Machinery and Engineering Systems in Vol 2, Pt 1, Ch 1 General Requirements for Classification of Engineering Systems and Vol 2, Pt 1, Ch 3 Requirements for Design, Construction, Installation and Sea Trials of Engineering Systems.

1.1.2 The scope of this Chapter includes gearing for main propulsion and auxiliary machinery, the support arrangements, the controls and systems necessary to maintain operation and functionality of the unit. The contents are in respect of mechanical integrity of the gears, control and monitoring systems and other support critical systems.

1.1.3 Marine gears utilised for propulsion or electrical power generation purposes are within the Mobility and Ship Type categories as defined in Vol 2, Pt 1, Ch 1, 3 Engineering system designation

1.1.4 The requirements of this Chapter are applicable to electric motor, gas turbine, steam turbines and engine gearing for driving:

  1. Conventional, totally submerged propeller(s)/impeller(s) for main propulsion purposes where the transmitted powers exceed 220 kW.

  2. Auxiliary machinery that is essential for the safety of the ship or for the safety of persons on board where the transmitted powers exceed 110 kW.

1.1.5 Gear designs for applications other than those specified in Vol 2, Pt 3, Ch 1, 1.1 Application 1.1.4 will be specially considered.

1.1.6 In any mesh, the terms pinion and wheel refer to the smaller and larger gear respectively.

1.1.7 Bevel gears will be specially considered on the basis of a conversion to equivalent cylindrical gears.

1.1.8 Gear type testing will be required as part of the approval process for first of type.

1.1.9  See Vol 2, Pt 1, Ch 3, 10 Gearing for construction, installation and testing requirements.

1.2 Power ratings

1.2.1 In this Chapter where the dimensions of any particular components are determined from shaft power, P, in kW, and revolutions per minute, R, the values to be used are those defined in Vol 2, Pt 1, Ch 3, 4.3 Power ratings

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