Section 1 General requirements
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Special Service Craft, July 2022 - Part 13 Shaft Vibration and Alignment - Chapter 1 Torsional Vibration - Section 1 General requirements

Section 1 General requirements

Parent topic: Chapter 1 Torsional Vibration

1.1 Application

1.1.1 This Section is to be read in conjunction with the requirements of Pt 9 General Requirements for Machinery, Pt 10 Prime Movers, Pt 11 Transmission Systems and Pt 12 Propulsion Devices.

1.1.2 Unless otherwise advised, it is the responsibility of the Builder as main contractor to ensure, in co-operation with the Enginebuilders, that the information required by this Chapter is prepared and submitted.

1.1.3 The requirements of this Chapter are applicable to the following systems:

  1. Main propulsion systems formed by oil engines, turbines or electric motors, directly driven or geared to the shafting.

  2. Machinery driven at constant speed by oil engines, developing 110 kW and over, for essential auxiliary services including generator sets which are the source of power for main electric propulsion motors.

1.2 Power ratings

1.2.1 In this Chapter where shaft power, P, in kW, and revolutions per minute, R, are referred to, the values to be used are those defined in Pt 9 General Requirements for Machinery.

1.3 Basic requirements

1.3.1 System designs are to take account of the potential effects of engine and component malfunction and variability in characteristic values.

1.3.2 Where torques, stresses or amplitudes are found to exceed the limits for continuous operation, restrictions in speed and/or power will be imposed.

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