Section 1 General requirements

1.1.1 This Section is to be read in conjunction with the requirements of Vol 2, Pt 1 General Requirements, Vol 2, Pt 2 Prime Movers, Vol 2, Pt 3 Transmission Systems and Vol 2, Pt 4 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 engines, turbines or electric motors, directly driven or geared to the shafting.

2. Machinery driven at constant speed by engines, developing 110 kW and over, for other Mobility and/or Ship Type systems including generator sets which are the source of power for main electric propulsion motors.

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 Vol 2, Pt 1, Ch 3, 4.3 Power ratings.

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.

1.3.3 Where significant changes are subsequently made to a dynamic system which has been approved, (e.g. by changing the original design parameters of the prime movers and/or propulsion shafting system or by fitting a propeller or flexible coupling of different design from the previous), the submission of revised calculations may be required. Details of all such changes are to be submitted for consideration.