Bay-class tugboat

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Coast Guard cutter Thunder Bay.JPG
The U.S. Coast Guard Cutter Thunder Bay clears a channel for vessels to navigate the frozen Hudson River
Class overview
Name: Bay class
Builders: Tacoma Boatbuilding Company, Tacoma, Washington and Bay City Marine Incorporated, National City, California
Operators: United States Coast Guard
Preceded by: WYTM-110
Built: 1977-1987
In commission: 1979-present
Planned: 10
Completed: 9
Active: 9
Retired: 0
General characteristics
Type: Icebreaking tugboat
Displacement: 662 tons
Length: 42.7 m (140 ft)
Beam: 11.4 m (37 ft 5 in)
Draught: 3.8 m (12 ft 6 in)
Propulsion: diesel electric: 2 Fairbanks Morse diesel engines with Westinghouse DC generators, 1 Westinghouse DC motor
Speed: 14.7 knots (27.2 km/h)
  • 1,500 nautical miles (2,800 km) at 14.7 knots (27.2 km/h)
  • 3,500 nautical miles (6,500 km) at 12 knots (22 km/h)
  • 6,000 nautical miles (11,000 km) at 10 knots (19 km/h)
Complement: 17 (3 officers)
Armament: 2 × M240 machine guns

The Bay-class tugboat is a class of 140-foot (43 m) icebreaking tugboats of the United States Coast Guard, with hull numbers WTGB-101 through to WTGB-109.

They can proceed through fresh water ice up to 20 inches (51 cm) thick, and break ice up to 3 feet (0.91 m) thick, through ramming. It can also ram pressure ridges of up to eight feet in thickness. These vessels are equipped with a system to lubricate their progress through the ice, by bubbling air through the hull.

Service Life Extension Program[edit]

The WTGB SLEP project includes significant system upgrades and improvements to the propulsion plant; heating, ventilation, and air conditioning systems; installation of an engine-room fire-suppression system; boat launching davit replacement; Oily Water Separator replacement; stack exhaust configuration modifications; hull air-ice lubrication system; and crew habitability improvements to meet current standards (including removal of lead paint). The first WTGB SLEP is scheduled for 12 months; however, once the Yard achieves a satisfactory production labor learning curve (anticipated after Hull #3), the Yard will complete two 140-foot WTGB SLEPs per year, with an anticipated duration of 9 months each. The first of nine cutters (Morro Bay) entered production at the Coast Guard Yard on July 1, 2014.[1] Morro Bay returned to her homeport of Cleveland in September 2015 [2]

President George Herbert Walker Bush tours USCGC Katmai Bay with the commanding officer, Coast Guard Lieutenant (now Vice Admiral) Sandra L. Stosz in 1990


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