Section 8 Turbines – Detailed requirements
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Naval Ships, January 2023 - Volume 1 Ship Structures - Part 1 Regulations - Chapter 3 Periodical Survey Regulations - Section 8 Turbines – Detailed requirements

Section 8 Turbines – Detailed requirements

Parent topic: Chapter 3 Periodical Survey Regulations

8.1 Complete Survey

8.1.1 The requirements of Vol 1, Pt 1, Ch 3, 7 Machinery survey – General requirements are to be complied with.

8.1.2 The following parts are to be opened out and examined:

  1. The working parts of the main turbines and of auxiliary machinery used for essential services, including bulkhead stop valves, manoeuvring valves, the blading, rotors, flexible couplings and casings.

8.1.3 In gas turbines the following parts are to be opened out and examined:

  1. The impellers or blading, rotors and casings of the air compressors, the combustion chambers, burners, intercoolers, heat exchangers, gas and air piping and fittings, starting and reversing arrangements.

8.1.4 Condensers, steam reheaters, desuperheaters which are not incorporated in the boilers, and any other appliances used for Mobility or Ship Type systems, are to be examined to the satisfaction of the Surveyor, and if it is considered necessary, they are to be tested.

8.1.5 The manoeuvring of the turbines is to be tested under working conditions.

8.2 Turbine condition monitoring (TCM)

8.2.1 Where the main propulsion steam turbines are provided with approved vibration monitoring equipment, a machinery notation TCM (Turbine Condition Monitoring) may be assigned provided that the following conditions are complied with:

  1. Vibration measurements recorded with equipment acceptable to LR are to be taken at regular intervals not exceeding six months. The records are to be retained on board and be available to the LR Surveyors for assessment at time of survey.

  2. Rotor position indicators are to be installed permanently on each turbine. Records of these readings are to be retained on board the ship for inspection by the LR Surveyor at time of survey.

8.2.2 For maintenance of the TCM notation, the records of vibration monitoring and rotor position readings are to be audited annually.

8.2.3 In addition to the vibration readings at the time of the survey, it is necessary to carry out a full power trial to demonstrate to the LR Surveyor that the turbines are in good working order.

8.2.4 Where the notation TCM has been assigned the main steam turbine top casings need not be lifted for examination of the rotors and diaphragms as required by Vol 1, Pt 1, Ch 3, 8.1 Complete Survey 8.1.2 provided the condition monitoring data are found within limits set by acceptance standards. The remaining requirements of Vol 1, Pt 1, Ch 3, 8.1 Complete Survey 8.1.2 are to be complied with. Where the Surveyor considers that the data presented is not entirely to his satisfaction, the top casing will be required to be lifted.

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