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 WaterlineB = moulded breadth in metersh= freeboard in meters, plus the sum … [Read more...]
Explosimeter
An instrument for measuring the composition of hydrocarbon gas/air mixtures, usually giving the result as a percentage of the lower flammable limit (LFL). … [Read more...]
Entry permit
A document issued by a responsible person allowing entry into a space or compartment during a specific time interval. … [Read more...]
Enclosed space
A space which has the following characteristics:Limited Openings for entry and exit; Unfavourable natural ventilation; and Is not designed for continuous worker occupancy.This includes, but is not limited to, cargo spaces, double bottoms, fuel tanks, ballast tanks, pump rooms, compressor rooms, cofferdams, void spaces, duct keels, inter-barrier spaces, engine crankcases and sewerage tanks. … [Read more...]
Earthing
Earthing is also referred to as ‘Grounding’. The electrical connection of equipment to the main body of the earth to ensure that it is at earth potential. On board ship, the connection is made to the main metallic structure of the ship which is at earth potential because of the conductivity of the sea. … [Read more...]