The holding power of an anchor determined through the calculation of Equipment Number or EN. The requirements of the various Classification Societies that are members of IACS have been unified within 'Unified Requirement A1' (UR A1). UR A1 provides a method of calculating the weight and size of the anchoring equipment required to be installed on-board through the calculation of the Equipment Number (EN): EN =    Δ²/³ + 2.0 hB + ( A/10 ) Where: Δ = moulded displacement, in tonnes, to the Summer Load Waterline B = moulded breadth in meters h= freeboard in meters, plus the sum … [Read more...]