Section 1 General service
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Inland Waterways Ships, July 2022 - Part 5 Main and Auxiliary Machinery - Chapter 7 Strengthening for Navigation in Ice - Section 1 General service

Section 1 General service

Parent topic: Chapter 7 Strengthening for Navigation in Ice

1.1 General

1.1.1 Where the notation ‘Ice’ as specified in Pt 1, Ch 2 Classification Regulations is desired, the following requirements are to be complied with, so far as these are applicable.

1.2 Materials for shafting

1.2.1 All components of the main propulsion system are to be of steel or other approved material.

1.3 Materials for propellers

1.3.1 Propellers and propeller blades are to be of cast steel or copper alloys having specified minimum tensile strengths as stated in Table 5.2.1 Materials for propellers in Chapter 5.

1.4 Main engine shafting and propellers

1.4.1 The diameter of the screwshaft as required by Pt 5, Ch 4, 3.5 Hollow shafts is to be increased by five per cent.

1.4.2 The thickness of the propeller blades at the root and at 60 per cent radius as required by Pt 5, Ch 5, 3.1 Minimum blade thickness are to be increased by eight per cent.

1.4.3 The tip thickness, t, of the blade at 95 per cent radius is to be not less than that obtained by the following formula:

t = mm
where
T = blade root thickness required, in mm
σu = specified minimum tensile strength of material, in N/mm2

1.4.4 For keyless propellers the mean torque Q as defined in Pt 5, Ch 5, 3.2 Keyless propellers is to be increased by 15 per cent.

1.5 CROSS REFERENCES

1.5.1 For hull requirements, see Pt 3 Ship Structures (General).

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