Section 7 Screwshaft 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 7 Screwshaft Condition Monitoring

Section 7 Screwshaft Condition Monitoring

Parent topic: Chapter 2 Machinery Survey Arrangements

7.1 ShipRight SCM descriptive note

7.1.1 Approval of a Screwshaft Condition Monitoring Scheme is based on plan approval of the screwshaft arrangements, in accordance with LR’s ShipRight Procedures for Machinery Planned Maintenance and Condition Monitoring. For existing ships, a full screwshaft survey is normally required, so that the initial condition of the tailshaft and stern tube bearing can be assessed.

7.1.2 The ShipRight SCM descriptive note will be assigned to the ship.

7.1.3 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.

7.1.4 Chief Engineers may not credit the screwshaft in LR Class Direct.

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

7.1.6 The Chief Engineer’s condition records will, subject to confirmatory surveys, be sufficient for the Surveyor to ‘X’ Credit the screwshaft without the tailshaft being withdrawn from the stern tube bearing at the normal five-yearly survey.

7.1.7 If the Surveyor is not satisfied with the operating condition or any aspect of the scheme’s operation, they may request that the tailshaft be withdrawn from the stern tube bearing.

7.1.8 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deficiencies, a report will be forwarded to the Classification Committee recommending that approval of the scheme be withdrawn.

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