Project Completion Report for Petroleum-Oil-Lubricant (POL) Pier Mooring Buoy System, Diego Garcia, B.I.O.T

摘要

The concept of using the two buoy moorings of the POL Pier Mooring Buoy System at Diego Garcia was adopted after considering an initial concept of a pier plus two mooring islands which proved to have constructural disadvantages that the present buoy moorings alleviated. The initial concept of two mooring islands was studied from a constructional viewpoint by analyzing 6 concepts of construction methods and concluded the safest and cheapest method was the use of a construction jacket for driving the required piles. The use of floating equipment was necessary for construction. This concept required two mooring buoys anchored in position each with 5 chain and anchor legs. Three of the legs were installed inshore as the main anchors to resist the ship forces. Two of the legs were installed outshore as back stays to hold the buoy in place with a pretension load. The two mooring buoys serve the purpose of securing bow and stern lines of maximum size ships and are located at the two ends of the pier approximately 175 feet from the edge of the pier and set back 60 feet (inshore) from the pier face. The two mooring buoys consist each of a single modified peg top buoy and 5 sets of anchor chains, sinkers and propellant embedment anchors.