Section 9 Starting arrangements
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 2 Prime Movers - Chapter 2 Gas Turbines - Section 9 Starting arrangements

Section 9 Starting arrangements

Parent topic: Chapter 2 Gas Turbines

9.1 General

9.1.1 The operating conditions under which provision for starting gas turbines is required are to be defined in the System Operational Concept document.

9.1.2 Where a gas turbine is required for the provision of Mobility systems or Ship Type systems, equipment for initial starting of the gas turbine is to be provided and arranged such that the necessary initial charge of starting air, hydraulic or electrical power can be developed on board the ship without external aid.

9.1.3 Alternatively, other devices of an approved type may be accepted as a means of providing the initial start.

9.1.4 Where the integrity of the starting system is susceptible to overspeed conditions, appropriate alarm and/or trip functions are to be provided.

9.2 Purging before ignition

9.2.1 Means are to be provided to clear all parts of the gas turbine of any accumulation of fuel before ignition commences on starting, or recommences after failure to start. The purge is to be of sufficient duration to displace at least three times the volume of the exhaust system.

9.3 Air starting

9.3.1 Air starting arrangements are to meet the requirements of Vol 2, Pt 7, Ch 3, 12 Air compressors and air starting arrangements. Exhaust from the start air system is to be arranged so as not to present a hazard to the crew.

9.4 Electric starting

9.4.1 Where the gas turbine is arranged for electric starting, the arrangement is to be equipped with two independent power sources with one source protected against depletion. In all cases the electrical systems forming the starting system are to comply with the requirements of Vol 2, Pt 9 Electrotechnical Systems.

9.5 Hydraulic starting

9.5.1 Where the gas turbine is arranged for hydraulic starting, then either the hydraulic pressure capacity of the power pack is to be sufficient to provide the number of starts of the gas turbine as required by Vol 2, Pt 2, Ch 2, 9.3 Air starting 9.3.1 or the hydraulic power pack is to be supplied by two independent sources of electrical power, one of which is to be suitably protected against depletion.

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