Section 3 Air environment
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 8 Rules for Ice and Cold Operations - Chapter 1 Application - Section 3 Air environment

Section 3 Air environment

Parent topic: Chapter 1 Application

3.1 Air temperature

3.1.1 For ships intended to operate in cold regions, the temperature on exposed surfaces is to be considered. See the Rules for the Winterisation of Ships, July 2022.

3.1.2 The mean daily low temperature is to be taken as the lowest mean daily low air temperature in the area of operation. For seasonally restricted service the lowest value within the period of operation applies:

where

Mean = statistical mean over a minimum of 10 years
Average = average during one day and one night
Lowest = lowest during the year or season
MDHT = Mean Daily High Temperature
MDAT = Mean Daily Average Temperature
MDLT = Mean Daily Low Temperature

Figure 1.3.1 Air temperature shows the definition graphically.

Figure 1.3.1 Air temperature

3.1.3 The external design air temperature is to be taken as the lowest mean daily low air temperature in the area of operation for the season of operation (Ty) minus 10 degrees Celsius (t = Ty – 10). For example: Ty = −20°C, t = −30°C.

3.1.4 Lowest mean daily low air temperatures for the Arctic and Antarctic are provided in Figure 1.3.2 Lowest mean daily air temperatures for the Arctic and Figure 1.3.3 Lowest mean daily air temperatures for the Antarctic.

Figure 1.3.2 Lowest mean daily air temperatures for the Arctic

Figure 1.3.3 Lowest mean daily air temperatures for the Antarctic
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