Section 6 Machinery surveys - General requirements
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Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Special Service Craft, July 2022 - Part 1 Regulations - Chapter 4 Periodical Survey Regulations for Yachts - Section 6 Machinery surveys - General requirements

Section 6 Machinery surveys - General requirements

Parent topic: Chapter 4 Periodical Survey Regulations for Yachts

6.1 Intermediate and Bottom Surveys

6.1.1 For Intermediate and Bottom Surveys, see Sections Pt 1, Ch 4, 2 Intermediate Surveys - Hull and machinery requirements and Pt 1, Ch 4, 3 Bottom Surveys and In-Water Surveys - Hull and machinery requirements.

6.1.2 For yachts where an Approved Planned Maintenance Scheme is in operation an Annual Survey of the machinery is to be carried out together with an audit of the maintenance and monitoring records.

6.1.3 For yachts assigned the Laid-up notation, a general examination of the machinery is to be carried out in lieu of the normal Intermediate Survey requirements.

6.2 Complete Surveys

6.2.1 While the yacht is in dry-dock, all openings to the sea in the machinery spaces and pump-rooms, together with the valves, cocks and the fastenings with which these are connected to the hull, are to be examined. For athwartships thrust propellers, see Pt 1, Ch 4, 10 Screwshafts, tube shafts, propellers and water jet units.

6.2.2 Athwartships thrust propellers are to be generally examined as far as is possible in dry dock and tested under working conditions afloat for satisfactory operation.

6.2.3 All shafts (except screwshafts and tube shafts, for which special arrangements are detailed in Pt 1, Ch 4, 10 Screwshafts, tube shafts, propellers and water jet units), thrust block and all bearings are to be examined. The lower halves of bearings need not be exposed if alignment and wear are found to be acceptable.

6.2.4 An examination is to be made as far as practicable of all propulsion gears complete with all wheels, pinions, shafts, bearings and gear teeth, thrust bearings and incorporated clutch arrangements.

6.2.5 The following auxiliaries and components are also to be examined:

  1. Auxiliary engines, auxiliary air compressors with their intercoolers, filters and/or oil separators and safety devices, and all pumps and components used for essential services.

  2. Steering machinery.

  3. Windlass and associated driving equipment, where fitted.

  4. The holding down bolts, chocks or resilient mounts of main and auxiliary engines, gearcases, thrust blocks and intermediate shaft bearings.

6.2.6 All air receivers for essential services, together with their mountings, valves and safety devices, are to be cleaned internally and examined internally and externally. If internal examination of the air receivers is not practicable, they are to be tested hydraulically to 1,3 times the working pressure.

6.2.7 The valves, cocks and strainers of the bilge system including bilge injection, are to be opened up as considered necessary by the Surveyor and together with pipes, are to be examined and tested under working conditions. The fuel oil, feed, lubricating oil and cooling water systems also any ballast connections together with all pressure filters, heaters and coolers used for essential services, are to be opened up and examined or tested, as considered necessary by the Surveyor. All safety devices for the foregoing items are to be examined.

6.2.8 Fuel tanks which do not form part of the yacht's structure are to be examined, and if considered necessary by the Surveyor, they are to be tested to the pressure specified for new tanks. The tanks need not be examined internally at the first survey if they are found satisfactory on external inspection. The mountings, fittings and remote controls of all fuel oil tanks are to be examined, so far as is practicable.

6.2.9 Where remote and/or automatic controls are fitted for essential machinery, they are to be tested to demonstrate that they are in good working order.

6.2.10 In addition to the above, detailed requirements for gas turbines and oil engines and electrical installations are given in Sections Pt 1, Ch 4, 7 Gas turbines - Detailed requirements, Pt 1, Ch 4, 8 Oil engines - Detailed requirements and Pt 1, Ch 4, 9 Electrical equipment respectively. In certain instances, upon application by the Owner or where indicated by the maker's servicing recommendations, the Committee will give consideration to the circumstances where deviation from these detailed requirements is warranted, taking account of design, appropriate indicating equipment (e.g. vibration indicators) and operational records, see Pt 1, Ch 2, 4.5 Existing service craft and yachts - Periodical Surveys 4.5.21 and Pt 1, Ch 2, 4.5 Existing service craft and yachts - Periodical Surveys 4.5.27.

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