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DIKSON Icebreaker-tug 1983

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DIKSON Icebreaker-tug 1983

Postby aukepalmhof » Tue Feb 02, 2021 7:56 pm

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Built as a tug-icebreaker under yard no 438 by Wärtsila Helsinki Shipyard. Finland for the Government of the Soviet Union managed by Murmansk Shipping Company.
April 1980 ordered.
06 January 1981 laid down.
09July 1982 launched as the DIKSON, named after the port Dikson - an urban locality in Taymyrsky Dolgano-Nenetsky District, Krasnoyarsk Krai, in Russia. It is a port on the Kara Sea, located on a headland at the mouth of Yenisei Gulf, on the Arctic Ocean coast.
Displacement 6,583 ton.
Tonnage 5.342 gt, 1.603 nrt, 2.281 dwt, dim. Length: 92.0 m (301.8 ft) (including towing notch), 88.5 m (290.4 ft) (hull), 78.5 m (257.5 ft) (dwl)
Beam:21.2 m (69.6 ft) (hull), 20.0 m (65.6 ft) (dwl). Draught: 6.8 m (22.3 ft) (maximum), 6.0 m (19.7 ft) (dwl)
Depth: 10.5 m (34.4 ft)
Ice class: LL4
Installed power: 4 × Wärtsilä 8R32 (4 × 2,390 kW). Propulsion: Two shafts; controllable pitch propellers. Speed: 16.5 knots (30.6 km/h; 19.0 mph).
17 March 1983 completed homeport Murmansk. IMO No 8009208.

DIKSON a Russian icebreaker and the final vessel in a series of three subarctic icebreakers built at Wärtsilä Helsinki shipyard in Finland in 1982–1983. The vessel's sister ships are MUDYUG (rebuilt in 1986) and MAGADAN.

Design
DIKSON's hull is 88.5 metres (290.4 ft) long overall and has a beam of 21.2 metres (69.6 ft) at its widest point. However, the towing notch increases the extreme length of the vessel to 92.0 metres (301.8 ft) while the inclined sides reduce the hull width to 20.0 metres (65.6 ft) at the design waterline. When loaded to the maximum draught of 6.8 metres (22.3 ft), the icebreaker has a displacement of 6,583 tonnes (6,479 long tons). The vessel's ice class, LL4, is intended for icebreaking operations primarily in ports and coastal areas. The maximum thickness of the shell plating in the bow region is 35 millimetres (1.4 in).
Unlike most icebreakers, DIKSON has a diesel-mechanical propulsion system where the vessel's four 2,390-kilowatt (3,210 hp) 8-cylinder Wärtsilä 8R32 medium-speed main engines are coupled in pairs through Lohmann & Stolterfoht Navilus twin-input/single-output single-stage reduction gearboxes to propeller shafts driving 4-metre (13 ft) four-bladed stainless steel KaMeWa controllable pitch propellers. In order to protect the main engines from large torque variations during icebreaking operations and to prevent the propellers from stopping when the blades come in contact with ice, each shaft has an 11.5-tonne (11.3-long-ton; 12.7-short-ton) flywheel to increase rotational inertia of the drivetrain. The vessel's icebreaking capability is further increased by a Wärtsilä Air Bubbling System (WABS) lubricating the hull as well as an active heeling system. On-board electrical power is generated by three Wärtsilä-Vasa 624TS auxiliary diesel engines with 960 kVA alternators.
DIKSON's bollard pull is 914 kilonewtons (93 tf) when operating with a continuous propulsion power of 7,000 kilowatts (9,400 hp). However, for short-term operation the icebreaker can use its maximum shaft output of 9,100 kilowatts (12,200 hp) to generate a bollard pull of 1,400 kilonewtons (140 tf). The vessel has a service speed of 16.5 knots (30.6 km/h; 19.0 mph) in open water and maintain a continuous speed of 2 knots (3.7 km/h; 2.3 mph) when breaking 1 metre (3.3 ft) thick level ice.

History
Development and construction
In 1977, Wärtsilä began developing a new icebreaker concept in close co-operation with experts from the Soviet Union. Although the Finnish shipbuilder had delivered more icebreaking vessels than any other shipyard in the world, they had all been diesel-electric vessels where diesel generators powered electric propulsion motors driving fixed-pitch propellers. In the new icebreakers, this fairly expensive specialized drivetrain would be replaced with cheaper and more efficient mechanical transmission where the main diesel engines would be connected to controllable pitch propellers through a reduction gearbox. An extensive research program was initiated by Wärtsilä Arctic Design and Marketing (WADAM) to ensure that the new concept was viable and that the problems encountered the recently commissioned United States Coast Guard Polar-class icebreakers would be avoided.
In April 1980, Wärtsilä and the Soviet Union signed a FIM 400 million shipbuilding contract for the construction of three icebreakers to escort ships in the freezing subarctic ports. The vessels, first of which would be delivered in late 1982 and the two following ones in 1983, would be stationed in the Barents Sea, Sea of Okhotsk and Baltic Sea.
DIKSON, the third and final Mudyug-class icebreaker, was laid down at Hietalahti shipyard at the same time with the second vessel of the series, MAGADAN on 6 January 1981, and launched on 9 July 1982. The vessel was delivered on 17 March 1983.

Career
While originally designed primarily for subarctic waters, DIKSON was handed to the Murmansk Shipping Company and initially sent to its namesake port in the Kara Sea to escort ships transporting ore from Dudinka along the Yenisei River. In 1986, the icebreaker was transferred to Northern Shipping Company and moved to Arkhangelsk in the White Sea. In 2006, DIKSON was transferred to Rosmorport and remains in service as of 2020.

Notable events
DIKSON was one of the numerous icebreakers involved in the shipping crisis in the Soviet Eastern Arctic where unprecedented ice conditions caused a major disturbance to shipping at the end of the 1983 navigating season.
In 2012, DIKSON was used to conduct seismic mapping in the Barents Sea. For this purpose, the icebreaker was fitted with a streamer and associated equipment in Norway.

In 2019, DIKSON towed the floating nuclear power plant AKADEMIK LOMONOSOV to Pevek. The convoy left Murmansk on 23 August and sailed 2,640 nautical miles (4,890 km; 3,040 mi) along the Northern Sea Route until arriving at its destination on 10 September ahead of schedule.
2021 In-service same name. Owned by the Russian Federation, and managed by Rosmoport, Arkhangelsk.

https://en.wikipedia.org/wiki/DIKSON_(icebreaker)
Sierra Leone 2020 58.000 Le sgMS?, Scott? The icebreaker on the stamp is the MACKINAW viewtopic.php?f=2&t=16800&p=19883#p19883 (DIKSON is in the margin of the miniature sheet.) Although this edition is authorized by the Sierra Leone postal administration, it was not sold in Sierra Leone but was only distributed to the novelty trade by the Sierra Leone philatelic agency.
aukepalmhof
 
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