4 Wind Force, Minimum Air Temperature, Visibility and Depth of Water
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1329 – Guidelines for Uniform Operating Limitations of High-Speed Craft – (11 June 2009) - Annex – Guidelines for Uniform Operating Limitations of High-Speed Craft - 4 Wind Force, Minimum Air Temperature, Visibility and Depth of Water

4 Wind Force, Minimum Air Temperature, Visibility and Depth of Water

  4.1 Paragraph 1.4.61 of the Code, in defining the worst intended conditions, makes specific reference to the following parameters, which should therefore appear on the Permit to Operate, when appropriate:

  • .1 significant wave height (refer to section 5 of these Guidelines);

  • .2 wind force (refer to chapter 2, paragraph 1.1.4 of annex 6, paragraphs 1.3 and 2.2 of annex 7 and paragraphs 1.1 and 2.1.4.3 of annex 8 of the Code. For example, in worst intended conditions the maximum wind pressure should not exceed that used in the craft’s stability calculations, nor should it create aerodynamic lift beyond that associated with the craft’s normal operating attitude);

  • .3 minimum air temperature (reference for example brittle fracture properties of materials, susceptibility to icing and resulting effect on stability, etc.);

  • .4 visibility (e.g., conditions of impaired vision and night navigation may necessitate improved navigation equipment or night vision equipment); and

  • .5 minimum safe water depth (e.g., safe navigation, bottom scouring, adverse effects on seabed flora and fauna, wash waves (see paragraph 7.2 below).

  4.2 The matters outlined in the preceding paragraph are intended to only comprise an illustrative and non-exhaustive list. They may be supplemented by Administrations to include, for example, the effect of sea ice on the craft’s structure, propellers, rudders and sea intakes and its ability to navigate safely and reach a place of refuge.

Parent topic: Annex – Guidelines for Uniform Operating Limitations of High-Speed Craft
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