20 ANCHORS AND CABLES
Objective:- The purpose of this section is to set out the minimum standard for anchoring and mooring arrangements. It should be noted that this element is to be an integral part of the Classification process and this should be reflected in the Class Notation.
20.1 Equipment
20.1.1 Vessels will be considered to have adequate equipment if fitted out in accordance with standards for such equipment, set by an approved Classification Society.
20.1.2 Vessels not built in accordance with 20.1.1 may be specially considered by the Administration, provided full information is submitted for approval.
20.1.3 All vessels are to have at least 2 anchors, one of which must be ready for use at all times. Any powered deployment system should be connected to an emergency power supply or be capable of being manually operated.
20.2 Sailing Vessels
20.2.1 The sizing of anchors and cables for sailing vessels should take into account the additional windage effect of the masts and rigging.
20.2.2 Typically, for square rigged sailing vessels, experience based guidance on approximate increase in anchor mass and cable strength required is:
for vessels up to 50 metres in length, typically 50% above the requirements for a typical motor vessel having the same total longitudinal profile area of hull and superstructure as the square rigged sailing vessel under consideration; and
for vessels 100 metres in length and over, typically 30% above the requirements for a typical motor vessel having the same total longitudinal profile area of hull and superstructure as the square rigged sailing vessel under consideration.
For a square rigged sailing vessel of between 50 and 100 metres in length the increase should be obtained by linear interpolation.