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Statutory Documents - IMO Publications and Documents - Resolutions - Assembly - IMO Resolution A.207(VII) Recommendation for an Interim Simplified Stability Criterion for Decked Fishing Vessels Under 30 Metres in Length (Adopted on 12 October 1971) - Annex - Recommendation for an Interim Simplified Stability Criterion for Decked Fishing Vessels Under 30 Metres in Length

Annex - Recommendation for an Interim Simplified Stability Criterion for Decked Fishing Vessels Under 30 Metres in Length

  1. For decked vessels with a length less than 30 m, the following approximate formula for the minimum metacentric height GMmin (in metres) for all operating conditions should be used as the criterion:

where
L = Length of the vessel on the waterline in maximum load condition (in metres)
ls = Actual length of enclosed superstructure extending from side to side of the vessel (in metres)
B = Extreme breadth of the vessel on the waterline in maximum load condition (in metres)
D = Depth of the vessel measured vertically amidships from the base line to the top of the upper deck at side (in metres)
f = = Smallest freeboard measured vertically from the top of the upper deck at side to the actual waterline (in metres)

The formula is applicable for vessels having:

  • (i) between 0.02 and 0.20;

  • (ii) smaller than 0.60;

  • (iii) between 1.75 and 2.15;

  • (iv) sheer fore and aft at least equal to or exceeding the standard sheer prescribed in Regulation 38(8) of the International Convention on Load Lines, 1966;

  • (v) height of superstructure included in the calculation not less than 1.8 m.

For ships with parameters outside of the above limits the formula should be applied with special care.

  2. The above formula is not intended as a replacement for the basic IMCO criteria (Resolution A.168(ES.IV)), but is to be used only if circumstances are such that cross curves of stability, KM curve and subsequent GZ curves are not and cannot be made available for judging a particular vessel's stability.

  3. The calculated value of GMmin footnote should be compared with actual GM values of the vessel in all loading conditions. If a rolling testfootnote, an inclining experiment based on estimated displacement or another approximate method of determining the actual GM is used, a safety margin should be added to the calculated GMmin.

Figure 1 Simplified Stability Criteria (fishing vessels under 30 m in length)


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