Section 7 Piping systems

7.1.1 Gas turbine piping systems are, in general, to comply with the requirements given in Pt 15, Ch 1 Piping Design Requirements and Pt 15, Ch 3 Machinery Piping Systems, due regard being paid to the particular type of installation.

7.1.2 Synthetic rubber hoses, with single or double closely woven integral wire braid reinforcement, or convoluted metal pipes with wire braid protection, may be used in compressed air, fresh water, sea-water, fuel oil and lubricating oil systems. Where synthetic rubber hoses are used for fuel or supply to burners, the hoses are to have external wire braid protection in addition to the integral wire braid.

7.2.1 Fuel oil arrangements are to comply with the requirements of Pt 15, Ch 3 Machinery Piping Systems.

7.2.2 Two or more filters are to be fitted in the fuel oil supply lines to the main and auxiliary turbines, and the arrangements are to be such that any filter can be cleaned without interrupting the supply of filtered fuel oil to the turbines.

7.3.1 Lubricating oil arrangements are to comply with the requirements of Pt 15, Ch 3 Machinery Piping Systems.

7.3.2 Where the lubricating oil for main propelling gas turbines is circulated under pressure, provision is to be made for the efficient filtration of the oil. The filters are to be capable of being cleaned without stopping the turbine or reducing the supply of filtered oil to the turbine.

7.4.1 Cooling water arrangements are to comply with the requirements of Pt 15, Ch 3 Machinery Piping Systems, as applicable.

7.5.1 The air-inlet system is to be designed to minimise the ingestion of harmful particles. Icing up of air intakes is to be prevented.

7.5.2 Means for preventing the accumulation of salt deposits in the compressors and turbines, e.g. water washing, are to be provided.

7.5.3 The arrangement of the exhaust system is to be such as to prevent exhaust gases being drawn into manned spaces, air conditioning systems and air intakes. They should not discharge into air cushion intakes.

7.5.4 Where the exhaust is led overboard near the waterline, means are to be provided to prevent water from being siphoned back to the turbine. Where the exhaust is cooled by water spray, the exhaust pipes are to be self draining overboard. Erosion/corrosion resistant shut off flaps or other devices are to be fitted on the hull side shell or pipe end and acceptable arrangements made to prevent water flooding the space.

7.5.5 Where two or more turbines have a common exhaust, an isolating device is to be provided in each exhaust pipe.

7.5.6 The exhaust system is to be arranged so that hot exhaust gases are directed away from areas to which personnel have access, either on board or in the vicinity of where the craft is berthed.