Section 10 Stability due to ice accretion – Winterisation S
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules for the Winterisation of Ships, July 2022 - Chapter 1 Rules for the Winterisation of Ships - Section 10 Stability due to ice accretion – Winterisation S

Section 10 Stability due to ice accretion – Winterisation S

Parent topic: Chapter 1 Rules for the Winterisation of Ships

10.1 Stability calculations and criteria

10.1.1 The effect of icing is to be considered in the stability calculations and is to comply with the IMO Resolution MSC.267(85) – Adoption of the International Code on Intact Stability, 2008 (2008 IS Code) – (Adopted on 4 December 2008), as amended – Chapter 6 – Icing considerations . The ice accretion values are to be taken as an additional mass per unit area, as given in Table 1.10.1 Ice accretion values.

Table 1.10.1 Ice accretion values

Winterisation Level Horizontal deck kg/m2 Vertical side kg/m2
Winterisation S(C) 30 7,5
Winterisation S(B) 60 15
Winterisation S(A) 100 25

10.1.2 Where surfaces are inclined or shaped, e.g. spherical covers or deck-houses, the most onerous condition from the projected horizontal or vertical area is to be taken in conjunction with the associated ice accretion value given in Table 1.10.1 Ice accretion values. All areas above the design waterline are to be included, e.g. side shell, deck-house sides and projected areas of deck cargo.

10.1.3 The stability criteria as given in the IMO Code on Intact Stability Resolution A.749(18) – 3.1 General intact stability criteria for all ships General intact stability criteria , are to be complied with, see Ch 1, 1.1 Scope 1.1.3 and Ch 1, 1.2 Application.

10.1.4 Stability calculations are to include the effects of ice accretion on the loading conditions specified in the IMO Code on Intact Stability. In addition, stability calculations are to be provided for the most onerous conditions and, at least, the following conditions:

  1. Establish specific winterisation conditions of loading and ballasting corresponding to the limits of compliance with the criteria, taking into account ice accretion as follows:

    1. Design draught condition.

    2. Minimum design ballast condition.

    3. Seagoing conditions, including both departure and arrival conditions:

      • homogeneous loading conditions;
      • alternate and part load conditions, where applicable;
      • normal ballast condition;
      • heavy ballast condition;
      • any specified non-uniform distribution of loading;
      • for oil and chemical tankers, conditions with high density cargo;
      • mid-voyage conditions relating to tank cleaning or other operations where these differ significantly from the ballast conditions; and
      • conditions covering ballast water exchange procedures.

  2. Establish ice accretion compliant conditions and limits for specified harbour/sheltered water conditions as follows:

    1. conditions representing typical loading and unloading operations;

    2. docking afloat condition; and

    3. propeller inspection afloat condition.

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