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 2 Axial Vibration - Section 1 General requirements

Section 1 General requirements

Parent topic: Chapter 2 Axial 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:

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

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 For all main propulsion systems, the Builders are to ensure that axial vibration amplitudes are satisfactory throughout the speed range. Where natural frequency calculations indicate significant axial vibration responses, sufficiently wide restricted speed ranges will be imposed. Alternatively, measurements may be used to determine the speed ranges at which amplitudes are excessive for continuous running.

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