Luling, La.-based Bisso Towboat has signed a contract with Main Iron Works, Houma, La., for construction of a 4,480-hp ASD ship-assist tugboat.
The new tug will share a design with the four azimuthing stern-drive tugs Main Iron has constructed for Bisso in the last 15 years. The 100’x38’x18′ tug will have a little more horsepower than its sister-ships, with a pair of Caterpillar 3516C Tier 3 main engines (compared with the other tugs’ Caterpillar Tier 2 engines) producing 2,240 hp each at 1600 rpm. Propulsion will be provided by two Rolls-Royce US 205 FP Z-drives featuring 90.4″x 82.4″ four-bladed stainless-steel propellers set in nozzles. The bollard pull is estimated to be around 60 tons.
Electrical service will be provided by two 99-kW Marathon generators powered by John Deere 4045AFM85 Tier 3 engines.
The tug will be equipped with one JonRie Intertech Series 230 hydraulic bow winch equipped with 500′ of 8″-circumference synthetic hawser.
Tankage includes capacities for 30,163 gals. of diesel fuel, 1,826 gals. each of lube and hydraulic oil and 10,938 gals. of potable water.
Construction is expected to begin in the fall with delivery in early 2015. The new tug will bring the total number of tugs in the Bisso fleet to 13.