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

6.1.1 At least three copies of the following plans are to be submitted for approval at the earliest opportunity:

• Crankshaft including details of the material specification.
• Gearing including details of the material specification.
• Arrangement and details of the propulsion shafting, couplings and bearing disposition etc.
• Propeller where the diameter exceeds 1 m.
• Diagrammatic arrangements of the exhaust systems indicating the materials, methods of cooling, and if water spray is injected, the method of draining.
• Starting air system and receivers.
• Diagrammatic arrangements of pumping and piping systems including the air and sounding pipes for the tanks.
• Diagrammatic arrangements of bilge and fire water pumps and piping for craft having a Rules length of 12 m and over and which are subdivided into watertight compartments.
• Diagrammatic arrangement of fuel oil piping.
• Construction arrangements of separate fuel oil tanks having a capacity exceeding 500 litres (250 litres for small craft).
• Electrical equipment as detailed in Pt 16, Ch 2 Electrical Engineering.
• Steering gear machinery and hydraulic circuit diagram if applicable.
• Fire extinction equipment as detailed in Pt 17 Fire Protection, Detection and Extinction.
• Safety plan showing the position of all fire prevention controls, fixed and loose equipment, and portable extinguishers, see Pt 17, Ch 1 Fire Protection, Detection and Extinction – General to Pt 17, Ch 4 System and Equipment Specifications.
• Control circuits and alarm points as detailed in Pt 16, Ch 1 Control Engineering Systems.

6.1.2 The following particulars are to be submitted with the plans of crankshaft, gearbox or shafting as applicable:

• Name of manufacturer.
• Type designation.
• Particulars of engine cycle.
• Number of cylinders and vee angle where applicable.
• Maximum combustion pressure and mean indicated pressure.
• Span of bearings adjacent to a crank measured from centreline of the bearing to the centreline of the adjacent bearing.
• Proposed shaft power (kW) and revolutions per minute of the engine at each operating condition.
• Gear box reduction ratio.
• For engines over 500 kW, see Pt 10, Ch 1, 2 Materials and components.

6.1.3 Where machinery system components or equipment have been approved under LR's Type Approval System or Machinery General Design Appraisal for the proposed design conditions or intended service, full details of the components should be advised to enable the validity of the approval to be checked. In cases where valid approvals are confirmed, plans are not required to be submitted for approval for individual craft.

6.2.1 Design calculations are to be submitted for the following systems and conditions:

1. Direct calculation for design strength of machinery supports, such as engine mountings, on craft subjected to high accelerations, see Pt 9, Ch 1, 5 Securing of machinery.

2. Calculations of torsional vibrations for main engines where the power exceeds 500 kW and for auxiliary engines for essential services where the power exceeds 110 kW.

6.3.1 The requirements of Pt 9, Ch 1, 3.1 Materials of construction apply to all types of craft.

6.3.2 Where no provision is made in these Rules, materials may be accepted provided that they comply with an approved specification and such tests as may be considered necessary by the Surveyor.

6.3.3 The requirements for materials for machinery components are indicated in the relevant Part or Chapter of the Rules.

6.4.1 The requirements of Pt 9, Ch 1, 4.2 Inclinations of the craft do not apply to yachts or service craft less than 24 m.

6.4.2 For patrol craft and high speed craft of 24 m or greater, the main and auxiliary machinery is to be designed to operate under the conditions defined in Pt 9, Ch 1, 4 Operating conditions and Pt 9, Ch 1, 5 Securing of machinery.

6.4.3 If operation under the required accelerations cannot be demonstrated on trials, alternative documentary evidence is to be presented to confirm that the machinery is capable of operating under such conditions.

6.4.4 Additional trials or conditions may be imposed to prove the machinery as considered necessary.

6.5.1 The requirements of Pt 9, Ch 1, 5.1 Fastenings, Pt 9, Ch 1, 5.3 Resilient mounts and Pt 9, Ch 1, 5.4 Resin chocks apply.

6.5.2 Engines are to be installed so as to permit easy access to fittings, such as lubricating oil connections, bilge suctions and sea cocks.

6.5.3 Where the hull is constructed of FRP, wood or composites, and the hull surfaces are not adequately protected against oil contamination, drip trays are to be fitted under those parts of the engine and gearbox where leakage of fuel oil or lubricating oil might occur. Means are to be provided for removing any leakage easily.

6.5.4 Where resilient mounts are fitted, the name of the manufacturer and details of the type of mounting are to be indicated on the plan of the shafting.

6.5.5 Where inclinations beyond those defined in 4.2 might be experienced, such as yacht roll over, means are to be provided to prevent machinery becoming dislodged.

6.5.6 Satisfactory arrangements are to be made to transmit the propulsion thrust into the craft structure.

6.6.1 For yachts and service craft of less than 24 m the ventilation of the machinery space is to be adequate for all conditions of the operation of the machinery and in no case is to be less than that required by the engine manufacturer.

6.6.2 The engine compartment is to be provided with inlet and outlet ventilating ducts. One or more inlet ducts are to extend down to a suitable low level.

6.6.3 Outlet ducts are to be connected near or at the top of the compartment and are to be arranged for natural or mechanical extraction as necessary.

6.6.4 Consideration will be given to equivalent alternative arrangements provided full details are submitted before construction is commenced.