Hydraulic/Electric Dredge Pumps – Murray and Roberts 1999/ Seychelles 1998

In 1999 Wale Marine was commissioned by LAMA/Murray and Roberts to assist them in the engineering related to the SAPREF replacement pipeline installation to the CALM Buoy. One major problem encountered was the dredging of sand before pipe pull. For this we designed a system for a submersible electric motor as well as a hydraulically driven unit for use with the 100kW 10” gravel pumps that have been developed for the West Coast alluvial diamond pumping. Bottom right shows a simple modular dredger using spirally wound pipe and a submersible dredge pump that we engineered for the dredging of the Fregate Island harbour in the Seychelles.