Section 5 Miscellaneous aspects
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Code for Offshore Personnel Transfer Systems, July 2022 - Chapter 2 Annex Recommendations for Safe Operation of the OPTS - Section 5 Miscellaneous aspects

Section 5 Miscellaneous aspects

Parent topic: Chapter 2 Annex Recommendations for Safe Operation of the OPTS

5.1 Integration

5.1.1 Before the OPTS is installed on an actual mothership it should be ensured that the accelerations of the actual mothership are within the design load envelope.

5.2 Target structure

5.2.1 The target structure should be designed to provide sufficiently rigid structural support to safely accommodate the landing of the OPTS gangway tip or personnel containment and to enable safe transfer of personnel. The target area should be free from obstructions.

5.2.2  It should be ensured that the OPTS gangway tip or personnel containment is functionally and structurally compatible with the target structure.

5.2.3 The motion compensation performance and/or limitations of the OPTS may need to be compatible with the station keeping capability and performance (e.g. system capability plot) of the target unit (if installed). For the assessment of the compatibility the following should be considered:

  1. safe situation after the worst case single failure of the station keeping system/arrangement;
  2. positioning restrictions induced by the target unit; and
  3. compensation capability of the OPTS.

5.3 Stowage

5.3.1 The system should be properly stowed as soon as the in-service wind speed and/or the in-service design significant wave height are exceeded by more than 50 per cent (whichever comes first). The out-of-service wind speed should be applied for design purposes.

5.3.2 Properly stowed is defined so as to cover at least the following aspects:

  1. The gangway or personnel containment of the OPTS is in its designated stowage position.
  2. The machinery systems of the OPTS are disconnected from the power source and are secured.
  3. The stowage arrangements and facilities of the OPTS are all engaged and locked.

5.3.3 For full stowage and in-field-transit any telescopic components (e.g. gangway) should be retracted as far as possible.

5.3.4 Depending on the OPTS type and design it may be acceptable for in-field-transit that a less strict securing regime is applied. For example, it might be acceptable that the gangway is only supported by the luffing systems and the gangway slewing is arrested by drive brakes for in-field-transit cases. However, in such cases it should be ensured that proper weather window information is obtained in order to ensure that the design loads for the system are not exceeded and/or hazardous situations, such as uncontrolled gangway movements, are avoided in all cases.

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