|New Standard Set with Double-hulled Double-screw Tankers|
Two new tankers on order to carry North Slope Crude from Valdez to the West Coast meet the Oil Pollution Act of 1990 requirements that older tankers be phased out and replaced with double-hulled vessels, meet or exceed state, federal, and international safety requirements and are designed to improve redundancy maneuverability and self-sufficiency.
Specially designed ships represent new generation of vessels
Each ship will carry 1,017,000 barrels. The contract for the ships was signed July 1, 1997 by Arco, and construction began in December. The two-ship contract carried a $332 million price tag.
The capacity of the two tankers will be equivalent to about 200,000 barrels a day of production.
With twin engines, the ship also has two propellers and two rudders. The rudders turn up to 45 degrees; present rudders only turn about 35 degrees. This enables the ship to turn within its own length and spin around at slow speeds.
Enclosed Bridge, Joystick Control
A single joystick will control both rudders, both propellers and the bow thruster. The ship has multiple levels of control systems so that if in the event the joystick fails it is backed up by two similar joysticks that separate port and starboard. After that, it's backed up by individual controls on both the throttles and the rudders for each side and each engine. Each engine room can be operated separately or jointly.
Engine Rood Designed for Unmanned Watch
A new power management system means the engine rooms can be unmanned, automatically sensing increasing loads from heavy seas. It will reduce the pitch on the propellers, maintaining a constant power on the engines, which enables the ship to run more efficiently with less damage.
Winch Controls to the Rail
Bits, used to tie up to the tanker, will be recessed in the sides of the ship so that tug crews can put their own lines on and take them off without crew on deck handling the lines, eliminating the risk of crew injuries.
30-year Life, Serviceability
Positioning Check Within 15 Feet
A New Standard in PWS Tankers
Editor's note: This article, by Petroleum News Alaska was edited for length.
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