Section 10 Anchoring equipment in deep and unsheltered water
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 3 Ship Structures (General) - Chapter 13 Ship Control Systems - Section 10 Anchoring equipment in deep and unsheltered water

Section 10 Anchoring equipment in deep and unsheltered water

Parent topic: Chapter 13 Ship Control Systems

10.1 General

10.1.1 It is recommended that the equipment requirements specified in this Section are complied with if the vessel intends to anchor in deep and unsheltered water. Where a ship’s anchoring equipment complies with the requirements of this Section, the ship will be eligible to be assigned the special features notation DWA.

10.1.2 The equipment specified is for ships intended to anchor in water with depth up to 120 m, current with speed up to 1,54 m/s, wind with speed up to 14 m/s and waves with significant height of up to 3 m. The scope of chain cable, being the ratio between the length of chain paid out and water depth, is assumed to be not less than 3 to 4. These requirements are applicable only to ships with a Rule length L of not less than 135 m.

10.1.3 The requirements specified in other Sections of this Chapter need to be complied with unless alternative requirements are provided.

10.2 Anchor and chain cable

10.2.1 Anchors and chain cables to be in accordance with Table 13.10.1 Anchoring equipment for ships in unsheltered water with depth up to 120 m and based on the Equipment Number EN1 obtained from the following equation:
where
a =
b =
L = Rule length, in metres, see Pt 3, Ch 1, 6.1 Principal particulars 6.1.1
EN = Equipment Number calculated in accordance with Pt 3, Ch 1, 7.1 Calculation of Equipment Number

10.2.2 The bower anchors are to be connected to their chain cables and positioned on board ready for use.

10.2.3 Anchors are to be of the stockless High Holding Power (HHP) type. The mass of the head of a stockless anchor, including pins and fittings, is to be not less than 60 per cent of the total mass of the anchor.

10.2.4 The mass, per anchor, of bower anchors given in Table 13.10.1 Anchoring equipment for ships in unsheltered water with depth up to 120 m is for anchors of equal mass. The mass of individual anchors may vary to 7 per cent of the tabular mass, but the total mass of anchors is not to be less than that specified for anchors of equal mass.

10.2.5 Bower anchors are to be associated with stud link chain cables of special (U2) or extra special (U3) quality. The total length of chain cable, as given in Table 13.10.1 Anchoring equipment for ships in unsheltered water with depth up to 120 m is t