Propulsion Profile: US Navy's Tier 4 Tugs
Built by Dakota Creek Industries in Anacortes, Wash., the first of the U.S. Navy's new fleet of six YT 808-class tugs was delivered in October after completing the last construction phase. Measuring 90 feet long and 38 feet 3 inches wide, the YT 808 vessel is powered by twin Cat 3512E marine engines, each rated at 1,810 horsepower. The engines drive two Schottel SRP 340 fixed-pitch z-drive thrusters providing a top speed of 12.5 knots and an expected bollard pull of 40 metric tons.The new series of Robert Allan Ltd.-designed tugs are the Navy's first vessels built to meet the U.S.
New Caterpillar Rig Pressure Pump Engine
Caterpillar's new 16-cylinder, 78 liter engine will be revealed for the first time at the 2013 CIPPE Show in Beijing. Manufactured in Lafayette, Indiana, the new Cat 3516C (HD) engine builds on the established track record of the 3512C (HD) engine, which has logged millions of hours in oilfields around the globe, including in China. The engine will be available in three ratings: 2,461 bkW (3,300 bhp), 2,349 bkW (3150 bhp) and 2,237 bkW (3000 bhp) @ 1900 rpm. The engine meets U.S. EPA Tier 2 Emissions for North America as well as Tier 1 Emissions for international markets.