Appendix B - Equipment Number
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1175/Rev.1 – Revised Guidance on Shipboard Towing and Mooring Equipment – (9 December 2020) - Annex - Shipboard Equipment, Fittings and Supporting Hull Structures Associated with Towing and Mooring - Appendix B - Equipment Number

Appendix B - Equipment Number

 The equipment number (EN) should be calculated as follows:

where:
Δ = Moulded displacement, in tonnes, to the Summer Load Waterline
B = Moulded breadth, in metres
h = Effective height, in metres, from the Summer Load Waterline to the top of the uppermost house; for the lowest tier 'h' should be measured at centreline from the upper deck or from a notional deck line where there is local discontinuity in the upper deck (see figure below for an example).

a = Distance, in metres, from the Summer Load Waterline amidships to the upper deck.
hi = Height, in metres, on the centreline of each tier of houses having a breadth greater than B/4.
A = Side-projected area, in square metres, of the hull, superstructures and houses above the Summer Load Waterline which are within the equipment length of the ship and also have a breadth greater than B/4.

NOTES:

1 When calculating h, sheer and trim should be ignored, i.e. h is the sum of freeboard amidships plus the height (at centreline) of each tier of houses having a breadth greater than B/4.

2 If a house having a breadth greater than B/4 is above a house with a breadth of B/4 or less, then the wide house should be included but the narrow house ignored.

3 Screens or bulwarks 1.5 metres or more in height should be regarded as parts of houses when determining h and A. The height of the hatch coamings and that of any deck cargo, such as containers, may be disregarded when determining h and A. With regard to determining A, when a bulwark is more than 1.5 metres high, the area shown below as A2 should be included in A.

4 The equipment length of the ships is the length between perpendiculars but should not be less than 96% nor greater than 97% of the extreme length on the Summer Waterline (measured from the forward end of the waterline).

Parent topic: Annex - Shipboard Equipment, Fittings and Supporting Hull Structures Associated with Towing and Mooring
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