Section 6 Requirements for craft which are not required to comply with the HSC Code

6.1.1 Service craft of less than 24 m do not have to comply with Pt 11, Ch 2, 1.3 Clutches 1.3.1 in respect of emergency operation of clutches on single screw installations.

6.2.1 The corrosion fatigue strength of corrosion resistant shaft material need not be submitted if the material is as shown in Table 2.4.1 `A’ Value for use in unprotected screwshaft formula , see also Pt 11, Ch 2, 2.2 Calculations and specifications.

6.3.1 The proposals to use extruded non-ferrous or composite materials will receive special consideration.

6.3.2 For the survey and testing of shaft material, see theRules for the Manufacture, Testing and Certification of Materials, July 2022.

6.4.1 For service craft less than 24 m, the requirements of Pt 11, Ch 2, 4.16 Sternbushes and sterntube arrangements 4.16.1 do not apply. Sterntube bearings of approved plastics materials are to be installed so as to ensure a supply of water for lubrication in accordance with the bearing manufacturer’s recommendations.

6.4.2 The aftermost propeller shaft bearing in the sterntube is to be secured to prevent rotational and axial movement.

6.4.3 For service craft less than 24 m, the requirements of Pt 11, Ch 2, 4.16 Sternbushes and sterntube arrangements 4.16.10 do not apply.

6.4.4 The lubrication of propulsion shafting bearings on SES craft less than 24 m will be considered.

6.5.1 The requirements of Pt 11, Ch 2, 5.1 Unattended machinery 5.1.1 do not apply to service craft less than 24 m.