2 Equipment Number Calculation (2024)

2.1 Requirements

2.1.1

Anchors and chains are to be in accordance with Table 1 and the quantity, mass and sizes of these are to be determined by the equipment number (EN), given by:

where:

When calculating h, sheer and trim are to be disregarded. For the lowest tier h is to be measured at centreline from the upper deck or from a notional deck line where there is local discontinuity in the upper deck, as shown in Figure 1.

h_FB : Freeboard amidships from the summer load waterline to the upper deck, in m.

h_n : Height, in m, at the centreline of superstructure or of deckhouse tier ‘n’ having a breadth greater than B/4. Where a house having a breadth greater than B/4 is above a house with a breadth of B/4 or less, the upper house is to be included and the lower ignored.

A : Side projected area, in m², of the parts of the hull, superstructures and houses above the summer load waterline which are within the length L and also have a breadth greater than B/4.

Fixed screens or bulwarks 1.5 m or more in height are to be regarded as parts of houses when determining h and A. In particular, the hatched area shown in Figure 2 is to be included.

The height of hatch coamings and that of any deck cargo, such as containers, may be disregarded when determining h and A.

2.1.2

For ships with EN greater than 16000, the determination of the equipment will be considered by the Society on a case-by-case basis.

Figure 1: Measurement of heights

Figure 2 Profile areas of screens and bulwarks