Section 6 Piping and machinery: approval
Clasification Society 2024 - Version 9.40
Clasifications Register Guidance Information - Guidance Notes for Air Lubrication System Guidance Notes, January 2020 - Chapter 1 Air Lubrication System Guidance Notes - Section 6 Piping and machinery: approval

Section 6 Piping and machinery: approval

Parent topic: Chapter 1 Air Lubrication System Guidance Notes

6.1 General

6.1.1 The machinery and piping design and arrangements should consider all potential failure mechanisms.

6.2 Design considerations

6.2.1 Pipe materials – the ADU piping material and schedule shall be considered by LR, whereas the piping inboard is a matter for the system designer.

6.2.2 Valves – accessibility, body and seating material, closing arrangement and control shall be considered when selecting the appropriate valve for the appropriate location. Valves for ship-side applications shall be installed such that the section of piping immediately inboard of the valve can be removed without affecting the watertight integrity of the hull. Indicators shall be provided locally to the valves and cocks, showing whether they are open or shut. The ship-side valves and fittings shall be of an approved type and made of approved material.

6.2.3 Routing – the system design should not introduce any additional hazards to the existing arrangements and take into consideration pressure, medium and temperature therein. The side shell valve should be as close to the side shell as practicable, taking account of tank layout, accessibility, longitudinal flexibility and existing arrangements, such as watertight bulkheads and fire classed bulkheads/decks.

6.2.4 Pressure vessels – requirements for approval depends on the system class, as defined by the temperature, pressure and material thickness.

6.2.5 Pressure relief – piping that is not designed to withstand the full pressure of the source supply should be provided with pressure gauges and with relief valves and have sufficient capacity to protect the piping against excessive pressure.

6.2.6 Temperature gradients and corrosion - thermal expansion and corrosion should be considered for the complete ALS piping system.

6.2.7 Personnel – should be appropriately protected against the hazard events associated with the pressure and temperature of the system.

6.4 Required submissions

6.4.1 Submissions shall include:
  • Diagrams and details of any additional and modified piping systems;
  • Integration of the ALS and its machinery items;
  • Arrangements of ALS machinery and equipment (for reference); and
  • Drawings and details of any (hydraulic/pneumatic/electric) actuating mechanisms (pipe design and working pressure and temperature, inner and outer diameters, thickness, material, etc.).

6.5 Deliverables

6.5.1 If considered necessary, a DAD is to be issued at the end of the design appraisal process.

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