This report describes the conceptual design of a direct pump-out facility for Corps of Engineers hopper dredges. Operational conditions were a significant wave height of 6.0 ft, wind velocity of 30 knots, and a current velocity of 2 knots. The mooring system was designed for operation in a minimum depth of 30 ft and a maximum depth of 45 ft. The following operational criteria were also required for the mooring design: (a) transportation by truck or rail, (b) rapid assembly with little or no diver support, and (c) installation with a minimum of lift support. The report examines five alternatives: (a) a guyed tower, tension leg platform (TLP), (b) a single anchor mooring (SALM), (c) a three-leg catenary anchor leg mooring (CALM), and (d) a four-leg CALM. The four-leg CALM was selected for further study because it best met the operational criteria. To accommodate truck transport, a 28-ft-long, 11-ft 6-in.-high, 7-ft 6-in.-deep capsule buoy was designed. The entire system (buoy, fluid swivel, mooring table, and buoy piping) is capable of being transported on six flatbed trucks or a single 40- by 120-ft deck barge. Direct pump-out, Hopper dredges, Single-point mooring buoy.


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