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Typ 991 Wulai ARC

There are actually three models of the 991 series of cable-laying vessels: 991, 991II and 991IIB, and the "Post and Telecommunications One" is the first ship of the 991II. Prior to the construction of the Youdian class, the Chinese Navy had only one cable-laying vessel, the Wulai-class ARC. This ship was constructed at Guangzhou Shipyard Donglong in the late 1960s.

The submarine cable has a history of more than 100 years, and it developed from the telegraph. As early as 1850, the British brothers John and Jacob Brett used a tugboat to lay the world's first submarine cable on the high seas between France and Britain. Unfortunately, because there was no protective device, only a few telegrams were sent and it was interrupted. In 1866, the transatlantic submarine cable was successfully laid, realizing the transatlantic telegraph communication between the European and American continents. Today, with the development of science and technology, communication technology has developed by leaps and bounds. The development of communications is inseparable from submarine cables.

However, to lay the submarine cable, a cable-laying ship is necessary. The laying of cables in China began in the 1960s. After the founding of the Peoples Republic of China, the task of laying waterlines for the Chinese navy became more and more important with the development of island construction. Since there is no dedicated cable-laying ship, it has seriously affected the communication between the mainland and the island. With no special cable-laying ship, the labor intensity is high when wiring the cable, and the performance of the non-professional cable-laying ship is poor, which seriously affects communication and national security. In order to avoid accidents and defects such as damage to the submarine cables, special special cable-laying ships must be used to ditch and bury the cables and maintain the cables. For this reason, in early 1961, the Navy commissioned the Sixth Aircraft Department to design a shallow-water cable-laying vessel. Subsequently, the third design office of 708 Institute conducted extensive research and preliminary design work began in October 1963. Extensive research was carried out in Room 3 of 708, and preliminary design work began in October 1963. After argumentation, it was deemed that the original design task book was not ideal for some issues, so in February 1964, two new schemes were made, and the original cable can only be loaded with a diameter of 40 mm, a length of 40 kilometers and a load of 155 tons. The single-cabin system is changed to a dual-cabin system with a diameter of 40 mm, a length of 70 kilometers and a load of 270 tons of cables. After repeated demonstrations, a double-cabin cable-laying ship capable of carrying 270 tons was designed and completed in February 1964. On August 2, 1965, the Sixth Machinery Ministry approved the design of this type of cable-laying ship and decided to build it by Wuchang Shipyard. However, the ship was later transferred to Guangzhou Shipyard and launched on June 7, 1969. The ship served in the South China Sea Fleet.

In March 1966, Room 3 was designed on-site at the Wuchang Shipyard, and the design was completed at the end of June, but the Wuchang Factory did not start construction. In 1967, the ship was transferred to the Guangzhou Shipyard for construction. It was launched in Guangzhou Shipyard on June 7, 1969. The sea trial was successful on New Year's Day in 1971. B230, served in the South China Sea Fleet.

This ship is mainly used to lay communication cables between salvage rivers, ports and islands. The stability is considered in accordance with the requirements of Class II sea area. The ship is equipped with an EKM-20 single-drum cable laying machine with a pulling force of 98.1 kN (10 ton force), which has a locked-rotor performance when overloaded.

Full load displacement 850 tons;
design displacement 691 tons ;
Ship length 54.60 meters;
vertical length 48.00 meters;
design waterline length 50.00 meters;
mould width 9.00 meters;
mould depth 4.40 meters;
design draft 2.6 meters;
Full load draft 3.05 meters;
Speed 12 knots;
Main engine Power 2X294 kilowatts (400 horsepower)
Personnel 56;
Cable load 70 kilometers long, 40 mm in diameter, 270 tons;

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Page last modified: 01-08-2021 14:08:50 ZULU