Section 9 Thruster Condition Monitoring
Clasification Society 2024 - Version 9.40
Clasifications Register Guidance Information - Guidance Notes for Machinery Survey Arrangements including The Examination of Surveyable Machinery Items by Chief Engineers, April 2021 - Chapter 2 Machinery Survey Arrangements - Section 9 Thruster Condition Monitoring

Section 9 Thruster Condition Monitoring

Parent topic: Chapter 2 Machinery Survey Arrangements

9.1 ShipRight ThCM descriptive note

9.1.1 Approval of a Thruster Condition Monitoring Scheme is based on remote audit of the scheme details, in accordance with LR’s ShipRight Procedures for Machinery Planned Maintenance and Condition Monitoring. For existing ships, a full thruster survey is normally required, so that the initial condition of the seals, bearings, gears and internal components can be assessed. Full condition monitoring data since the last complete survey of the thruster may be submitted for consideration in lieu of visual inspection.

9.1.2 The ShipRight ThCM descriptive note will be assigned to the ship.

9.1.3 The Chief Engineer should ensure that:
  1. The approved scheme is effectively implemented;
  2. Maintenance and monitoring records are maintained;
  3. Records are made available to the attending Surveyor at Annual Audits.

9.1.4 Chief Engineers may not credit the thruster in LR Class Direct.

9.1.5 The Surveyor will confirm the correct operation of the scheme and satisfactory functioning of the thruster at Annual Audit, harmonised with the classification Annual Survey.

9.1.6 The Chief Engineer’s condition records will, subject to confirmatory surveys, be sufficient for the Surveyor to ‘X’ Credit the thruster without removal/opening out at alternate five-yearly surveys.

9.1.7 If the Surveyor is not satisfied with the operating condition or any aspect of the scheme’s operation, they may request that items be opened out for inspection.

9.1.8 If deficiencies in the operation of the scheme are identified, either from the maintenance and monitoring records or from the general condition of the machinery, the attending Surveyor may advise that a further Audit will be required and impose a suitable Condition of Class. In the event of serious deficiencies, a report will be forwarded to the Classification Committee recommending that approval of the scheme be withdrawn.

NOTES:
  • The survey of the external structure of the unit, propeller blades and sealing arrangements is unaffected by this scheme.
  • An ‘Asset Note’ in LR Class Direct will identify the last thruster ‘opened up survey’ date.
  • The Chief Engineer should prepare to open out the thruster for examination at the next five-yearly survey, as requested by the attending Surveyor.
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