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An equipment number Yen a dimensionless parameter used to determine the size and number of anchors chain cables and Mooring and towing lines for a new ship
the anchoring equipment determined in accordance with the equipment number is intended for temporary Mooring of a vessel within a harbor or sheltered area
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YouTube Video Description↓
How the weight of the Anchor and diameter of the Chain are selected? Calculation & use of Equipment Number An equipment number (EN) is a dimensionless parameter used to calculate the number and size of anchors, chain cables, and mooring and towing lines for a new ship. The EN is calculated using a standard equation that takes into account the area above and below the water surface. These requirements are based on maximum current of 8 [km/hr], wind speed of 25 [m/sec], water depth of 5-7 [m] and good holding ground conditions. Where environmental conditions are more onerous, special consideration will be required. The EN may have to be calculated (please see MSC.1/Circ.1175/Rev.1).