Built in 2007, by Patti Shipyard of Pensacola, Florida (hull #166) as the Duty for Express Marine of Camden, New Jersey.
She is powered by two Caterpillar 3512BDITA diesel main engines with two Centa carbon fiber shafting with Centalink torsional couplings connected to two SteerProp SP14 azimuthing propulsors or "z-drives" fitted in HJ3 high performance nozzles turning 1900(mm)diameter four bladed propellers for a rated 3,000 horsepower.
The Duty is one of the first tugs built in North America with Steerprop azimuthing stern drives. Steerprop drives are regularly used on European tugboats. Her electrical service is provided by three John Deere 6081AMK330 generators producing 130kW at 1,800 rpm.
Her towing gear consists of a JonRie InterTech series 500 single drum Hydraulic towing winch outfitted with 2,400(ft) of of 1 3/4(in) towing wire with an 82,500 lb line pull at 60 feet per minute. She is also fitted with JonRie InterTech series 421 hydraulic capstans with a 20,000 lb. line pull at 30 feet per second. The capstans are mounted next to the tow winch and on the tug's bow. Power for the winch is produced by one of the tug's three generators. The tug is outfitted two hydraulic pins, and a hold down clamp as well as a transom roller on her stern and a North Pacific Crane model MCT-1030, 10-ton hydraulic crane with telescoping boom with a 30(ft) reach that is mounted on the second deck aft of the wheelhouse.
She is fitted with custom designed port and starboard deck winches for wire push gear in lieu of using the towing winch for the push gear.
Fixed pads are mounted on each side of the tug to maintain stability while pushing in a barge's notch. A number of Express Marine tugs feature this type of pad arrangement which was originally designed by the company for use on its 1150 class barges for service to the Hudson Generating Station in Jersey City, New Jersey. The tugs typically force their way into and out of the notch with the application of grease on the pads.
Due to the high amount of coal dust generated by the product their barges carry the Duty is outfitted with an expanded air filtration capacity both for use by air breathing engines and for the interior. Much of the extra filtration equipment is located in the stack assembly of the tug. Air being drawn into the vessel, whether it be for ventilation or for internal combustion, goes into a filter bank. Any air drawn down to the engines or engine room is filtered twice.
The tug's capacities are 44,000 gallons of Fuel Oil, 850 gallons of Hydraulic Oil, 850 gallons of lube oil, 1,400 gallons of waste oil 4,900 gallons of potable water, 6,000 gallons of wash water and 1,700 gallons of sewage.