Section 1 General

1.1 Application

1.1.1 The anchoring equipment specified in this Section is suitable only for use in reasonably sheltered conditions or in emergencies. If the equipment is intended to be used during operations in the open sea, or if the sea or weather conditions in the service area are subject to unusual hazards, e.g. typhoons, etc. the equipment will be specially considered in each case.

1.1.2 Where the Equipment Number exceeds 1140 the equipment is to be in accordance with Pt 3, Ch 13 Ship Control Systems of the Rules and Regulations for the Classification of Ships.

1.2 Definitions

1.2.1 The definitions for use throughout this Chapter are as indicated in the appropriate Section.

1.3 Symbols

1.3.1 The following symbols are used in this Chapter, unless otherwise stated:

b _i

mean breadth of deckhouse or superstructure tier, in metres

h _i

mean height of deckhouse or superstructure tier, in metres

area, in m², in profile view of the hull, superstructure and deckhouses above the design waterline. Deckhouses with breadth less than B/4 are to be ignored

B ₀

the greatest moulded breadth, in metres, or for craft of composite construction, the extreme breadth excluding rubbing strakes or other projections

B ₁

the greatest breadth of the outer hulls of a multi-hull craft, in metres. It is to be measured between the points of intersection of the extension of the hull sides to the normal line of the wet deck

B ₂

the greatest breadth of the centre hull in trimaran type craft, in metres. It is to be measured between the points of intersection of the extension of the hull sides to the normal line of the wet deck

D _h

the sum of b _i h _icos θ_i for all deckhouses and superstructures tiers

G _A

air gap, as defined in Pt 5, Ch 1 General

α₁

for multi-hull craft is the distance in metres, from the underside of the cross-deck structure to the underside of the first tier of deckhouse or superstructure
for mono-hull craft is the distance in metres, from the waterline to the underside of the first tier of deckhouse or superstructure

θ_i

angle of inclination aft, of tier of deckhouse front, with a line perpendicular to the static load waterline

loaded displacement, in tonnes

1.4 Character of classification

1.4.1 To entitle a craft to the figure 1 in its character of classification, equipment in accordance with the requirements of this Chapter is to be provided. The regulations governing assignment of the character figure 1 for equipment are given in Pt 1, Ch 2, 3 Character of classification and class notations.

1.4.2 For craft intended to be operated only in suitable areas or conditions which have been agreed by LR, as defined in Pt 1, Ch 2, 3.5 Service area restriction notations, equipment differing from these requirements may be approved if considered suitable for the particular service on which the craft is to be engaged.

1.4.3 Where the Committee has agreed that anchoring and mooring equipment need not be fitted in view of the particular service of the ship, the character letter N will be assigned, see also Pt 1, Ch 2, 3.2 Character symbols 3.2.2.

1.4.4 Where the ship is intended to perform its primary designed service function only while it is anchored, moored, towed or linked, the character letter T will be assigned, see also Pt 1, Ch 2, 3.2 Character symbols 3.2.2.

1.4.5 For classification purposes the character figure 1, or either of the character letters N or T, are to be assigned.