Section 8 Sub-systems for gearing
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Naval Ships, January 2023 - Volume 2 Machinery and Engineering Systems - Part 3 Transmission Systems - Chapter 1 Gearing - Section 8 Sub-systems for gearing

Section 8 Sub-systems for gearing

Parent topic: Chapter 1 Gearing

8.1 General

8.1.1 The lubricating oil distribution system for gears and bearings is to comply with the gear manufacturer's requirements and recommendations.

8.1.2 Piping systems for gearing are to comply with the general design requirements in Vol 2, Pt 7, Ch 3 Machinery Piping Systems. Specific requirements for lubricating/hydraulic oil systems and standby arrangements are also stated in Vol 2, Pt 7, Ch 3 Machinery Piping Systems

8.1.3 Lubricating oil lines are to be screened, or otherwise suitably protected, to avoid oil spray or oil leakage onto hot surfaces, into machinery air intakes or other sources of ignition. The number of joints in such piping systems is to be kept to a minimum. Flexible pipes are to be of approved type.

8.2 Pumps

8.2.1 Where lubricating oil for gearing is circulated under pressure, pump standby arrangements are to be provided in accordance with Vol 2, Pt 7, Ch 3 Machinery Piping Systems.

8.3 Filters

8.3.1 Where lubricating oil for gearing is circulated under pressure, provision is to be made for efficient filtration of the oil. The filters are to be capable of being cleaned without stopping the gears or reducing the supply of filtered oil to the gearing.

8.4 Gearbox dehumidification

8.4.1 All gearboxes installed in NS1 and NS2 category ships are to be fitted with a dehumidifier to remove moist air from the gearcase during periods of shutdown.

8.4.2 The dry air produced by the dehumidifier is to have a relative humidity of no more than 30 per cent at 15°C.

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