Marine Engineering and Naval Architecture

After having found the equipment numeral from previous blog , the details regarding sizes and quality  may be obtained from the rigging tables provided in these regulations. From these table , we can find the following information The Equipment Letter Stockless bower anchors number of anchor Mass per anchor (kg) Stud-link chain cables for bower anchors Total length (m) Grade and Diameter (mm) of chain CC1———— low  strength. CC2———–medium strength. CC3———–high strength Towline Minimum length (m) Minimum breaking strength (KN) Mooring Lines Number Length of each mooring ropes (m) Minimum breaking strength (KN)

The equipment number, EN, on which the requirements of equipment ship anchor are based is to be calculated as follows :- EN = K * ENc where, ENc = Δ^2/3 + 2BH + 0.1A where, Δ = moulded displacement, [t], to the summer load water line. H = effective height, [m], from the summer load waterline to the top of the uppermost deck-house, to be measured as follows: H = a + Σhi a = distance [m] from summer load waterline amidships to the upper deck at side. hi = height [m] on the centreline of each tier of houses having a breadth greater than B/4. For lowest tier, hi is to be measured at centre line from the upper deck, or from the notional deck line where there is a local discontinuity in the uppers deck. A = area [m2] in profile view of the hull, superstructures and houses above the summer load waterline, which is within the Rule length of the vessel. Houses of breadth less than B/4 are to be disregarded. In the calculation of H and A, sheer and trim are to be ign...

The Volume of Displacement is the quantity of water required to fill the molded shape of the hole left by a ship, if she were lifted out of the medium in which sheep floats. It should be noted that the Ship’s Displacement maybe expressed in either terms of ton weight, or measured capacity in cubic foot. And it should be noted also that Salt and Fresh water are different to each other; and we can float more easily in Salt Water (sea, ocean) compare to Fresh Water (swimming pool, river). The Coefficient is expressed as a decimal and varies from about .5 in the case of five lined yachts, gradually increasing through .6 to .75 in the case of fast passenger steamers and to .85 for slow, bluff, cargo type of vessels. The Formulas to find Ship or Vessel Displacement in either Sea Water or Fresh Water: Sea Water Displacement Formula: Displacement (Tons) = L x B x D x C / 35 Displacement (Cubic Foot) = L x B x D x C / 0.9912 Fresh Water Displacement Displacement (Tons) =...