Section 8 Piping systems
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules for the Classification of Air Cushion Vehicles, July 2022 - Chapter 4 Machinery - Section 8 Piping systems

Section 8 Piping systems

Parent topic: Chapter 4 Machinery

8.1 General requirements

8.1.1 The requirements of SSC Rules, Pt 15, Ch 1 Piping Design Requirements, and Pt 15, Ch 3 Machinery Piping Systems are to be applied, except where modified by this Section.

8.1.2 All piping systems and their associated fittings which are subject to internal pressure are appropriately tested, including a pressure test, before being put into service for the first time.

8.1.3 Fuel piping is to be routed outside accommodation and cargo spaces. Within engine spaces all piping and equipment carrying flammable fluids is to be manufactured with non-heat sensitive materials.

8.1.4 Where the surface temperature of engine exhaust pipes and silencer may exceed 220°C, they are to be water cooled or efficiently lagged to minimise the risk of fire and to prevent damage by heat. Where lagging covering the exhaust piping system including flanges is oil-absorbing or may permit penetration of oil, the lagging is to be encased in sheet metal or equivalent. In locations where the Surveyor is satisfied that oil impingement could not occur, the lagging need not be encased.

8.1.5 Materials used in piping systems are to be compatible with the fuel conveyed and due regard given to the risk of fire. Non-metallic piping material may be permitted in certain systems, provided the integrity of the hull and watertight decks and bulkheads is maintained.

8.1.6 For ACVs with no sea-water connections, where it can be demonstrated that the buoyancy of the ACV in the damage stability condition can be achieved without the need for dewatering, a bilge system complying with the requirements of Pt 15, Ch 2, 4 Bilge pumping and drainage systems of the SSC Rules need not be fitted.

8.1.7 A bilge system for drainage in the case of flooding may not be required where the ACV in still water has sufficient buoyancy and positive stability simultaneously to ensure that:

  1. after flooding has ceased and a state of equilibrium has been reached, the final waterline is below the level of any opening through which further flooding could take place by at least 25 per cent of the significant wave height corresponding to the worst intended conditions;

  2. there is a positive freeboard from the damage waterline to survival craft embarkation positions;

  3. essential emergency equipment, emergency radios, power supplies and public address systems needed for organising the evacuation remain accessible and operational; and

  4. the residual stability of the ACV meets the appropriate criteria as laid out in HSC 2000 Code, annexes 7 and 8 according to Table 2.3.4. Within the range of positive stability governed by the criteria of annexes 7 and 8, no unprotected opening is to be submerged.

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