The Port of Portland Navigation Division owns and operates the Dredge Oregon that maintains the Columbia River navigation channel. The Port hired Glosten to develop a comprehensive design package for repowering and refitting the dredge.
Repower to Reduce Emissions
Maintenance dredging ensures a safe and operable transit route for ships. Dredging operations run all day, every day from June through January of each year. Dredge Oregon was using about 4,200 gallons of diesel fuel per day to maintain dredging at about 2,000 – 3,000 cubic yards of material per hour. The Port identified the dredge, with its 1960s-era engine, as its single largest source of diesel particulate emissions.
Glosten Engineers a System Refit
Glosten developed the detail design for a mechanical and electrical repower, including replacement of the vessel’s two diesel generator sets, cutterhead motor and reduction gear, and ship service electrical distribution system. Glosten selected the equipment including main pump engine and dredge pump. The pump system has all the same mechanical elements as a propulsion system. Determining and selecting the engine/gear configuration to provide the necessary power and torque throughout the operating range was a particular challenge.
Port Realizes Significant Emissions Reduction
Due to the Port’s active dredging schedule, the repower and refit work were completed over two shipyard periods. The refurbished dredge can now perform its primary dredging duties in almost any weather condition and river stage. Dredge Oregon burns significantly less fuel, reducing diesel particulate emissions by 88 percent.
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