3.3 Cargo ships carrying timber deck cargoes
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Statutory Documents - IMO Publications and Documents - International Codes - 2008 IS Code – International Code on Intact Stability, 2008 - Part A – Mandatory Criteria - Chapter 3 – Special Criteria for Certain Types of Ships - 3.3 Cargo ships carrying timber deck cargoes

3.3 Cargo ships carrying timber deck cargoes

 Cargo ships carrying timber deck cargoes shall comply with the requirements of 2.2 and 2.3 unless the Administration is satisfied with the application of alternative provision 3.3.2.

Parent topic: Chapter 3 – Special Criteria for Certain Types of Ships

3.3.1 Scope

 The provisions given hereunder apply to all ships of 24 m in length and over engaged in the carriage of timber deck cargoes. Ships that are provided with, and make use of, their timber load line shall also comply with the requirements of regulations 41 to 45 of the 1966 Load Line Convention.

3.3.2 Alternative stability criteria

 For ships loaded with timber deck cargoes and provided that the cargo extends longitudinally between superstructures (where there is no limiting superstructure at the after end, the timber deck cargo shall extend at least to the after end of the aftermost hatchway)footnote transversely for the full beam of ship, after due allowance for a rounded gunwale, not exceeding 4% of the breadth of the ship and/or securing the supporting uprights and which remains securely fixed at large angles of heel may be:

  3.3.2.1 The area under the righting lever curve (GZ curve) shall not be less than 0.08 metre-radians up to = 40° or the angle of flooding if this angle is less than 40°.

  3.3.2.2 The maximum value of the righting lever (GZ) shall be at least 0.25 m.

  3.3.2.3 At all times during a voyage, the metacentric height GM0 shall not be less than 0.1 m, taking into account the absorption of water by the deck cargo and/or ice accretion on the exposed surfaces (details regarding ice accretion are given in part B, chapter 6 (Icing considerations)).

  3.3.2.4 When determining the ability of the ship to withstand the combined effects of beam wind and rolling according to 2.3, the 16° limiting angle of heel under action of steady wind shall be complied with, but the additional criterion of 80% of the angle of deck edge immersion may be ignored.

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