Samuel Risley-class icebreaker
Samuel Risley in 2008
|
|
| Class overview | |
|---|---|
| Name: | Samuel Risley class |
| Builders: | |
| Operators: |
 Canadian Coast Guard
|
| Built: | 1985–1986 |
| In service: | 1985–present |
| Completed: | 2 |
| Active: | 2 |
| General characteristics | |
| Type: | Icebreaker and buoy tender |
| Tonnage: | |
| Displacement: | 2,935 long tons (2,982 t) full load |
| Length: | 69.7 m (228 ft 8 in) |
| Beam: | 13.7 m (44 ft 11 in) |
| Draught: | 5.2 m (17 ft 1 in) |
| Ice class: | Arctic Class 2 |
| Installed power: |
|
| Propulsion: | 2 × controllable pitch propellers |
| Speed: | 13–15 knots (24–28 km/h) |
| Endurance: | 58 days |
| Complement: | 24 |
The Samuel Risley-class icebreakers are a class of two icebreakers and buoy tenders constructed for and operated by the Canadian Coast Guard. The two ships are based on offshore supply tugboat design and entered service in the 1980s. Samuel Risley is deployed to the Central Region, operating mainly on the Great Lakes of North America while Earl Grey is posted to Atlantic Canada, working off the east coast of Canada.
In the late 1970s, offshore supply tugboats were in high demand and their success led to experimentation by the Canadian Coast Guard. In 1980, a crane was temporarily installed aboard the former offshore supply vessel CCGS Jackman, situated on the afterdeck. This was done to see if this would be a successful model for buoytending. Jackman visited all the principal coast guard stations in the eastern half of the country to test the setup in different conditions in 1980–81. The results of the test proved positive and in 1983, the Canadian Coast Guard contracted Robert Allen Ltd of Vancouver to create a design based on this setup.
The design of the vessels is based on offshore supply-tugboat designs, with strengthened chines. The vessel has a tall foredeck, and a long low quarterdeck, for carrying buoys, where a crane with a capability of lifting 15 long tons (15 t) is permanently mounted. The crane is motion stabilized. Both vessels are 69.7 metres (228 ft 8 in) long overall with a beam of 13.7 metres (44 ft 11 in). The icebreakers have a draught of 5.2 metres (17 ft 1 in). Both ships displace 2,935 long tons (2,982 t) with Earl Grey having a 1,988 gross tonnage (GT) and a 642 net tonnage (NT) and Samuel Risley having a gross tonnage of 1,967 and a net tonnage of 649.5.
Earl Grey is powered by four Deutz 4SA 9-cylinder diesel-electric engines driving two controllable pitch propellers that create 8,836 horsepower (6,589 kW). This gives the vessel a maximum speed of 15 knots (28 km/h). The vessel has a capacity of 634 m3 (22,400 cu ft) of diesel fuel that gives Earl Grey a range of 18,000 nautical miles (33,000 km) at 11 knots (20 km/h) and the vessel can stay at sea for up to 58 days. The ship is equipped with one Caterpillar 3306 emergency generator.Samuel Risley is powered by four Wärtsilä Vasa 16V22 12-cylinder geared diesel-electric engines driving two controllable pitch propellers that create 6,595 kW (8,844 hp). This gives the vessel a maximum speed of 13 knots (24 km/h). The vessel has a capacity of 692 m3 (24,400 cu ft) of diesel fuel that gives Samuel Risley a range of 16,700 nautical miles (30,900 km) at 12 knots (22 km/h). The ship is equipped with one General Motors 6–71 emergency generator.
...
Wikipedia