Page 140 - Peterson 85 Years and Going Strong

I have Peterson’s dispatcher on speed dial.
– Peter Zwart, VP of operations, Baydelta Maritime, 2016
ZWART AND FLOYD TEAM UP
With the looming tough emissions requirements, even large marine companies like Crowley and Foss were staggering under the capital outlay required, given that new harbor tugs cost in the $25 million range. We put our expertise together to design a package because we knew that 80 percent of a harbor tug’s running time is spent either maneuvering or standing by.
Our hybrid design utilized electric motors plugged into the rear of the azimuth drives, which were driven by the vessel’s Cat marine generator sets. When the high horsepower wasn’t needed, they could run the vessel on electrical power, using the smaller engines driving the gen-sets. When the tug hooked up to a cargo vessel and needed 100 percent of its nearly 7000 hp, they brought the Cat 3516s back online.
The new design was both fuel-efficient and reduced emissions.
—Rich Floyd, marine engine sales, Peterson Power Systems
Top left, clockwise: Installing one of two Cat 3516 marine engines in the Delta Audrey in April 2014; Rich Floyd inside the Delta Audrey in April 2014; Bar Pilot tugs on San Francisco Bay
138 | PETERSON: 85 YEARS AND GOING STRONG