Type 918 Wolei / Bulieijian class minelayer
This relatively large minelayer may be employed as a minesweeper support ship in addition to minelaying duties. Only one hull (Wolei), reportedly based on a Japanese design, was constructed and in service. Complete in January 1988, the minesweeper was capable of the re-supply and re-loading of mines in. It was equipped with a folding crane, a multi-directional mine-transporting system, and navigation-command system better coordinated mine-laying. It was retired in 2012 and delivered to the sea surveillance, and was renamed: China Haijian 112.
From the 1970s to the early 1980s, China faced strong military pressure. In order to prevent the enemy from crossing the Bohai Strait and directly attacking the coastal areas of Tianjin and Hebei, it is necessary to strengthen the defense of the Bohai Strait. The deployment of mine obstacles is an effective means of blocking the channel waterways. At that time, there was no special mine-laying ship in China. To deploy mines, except for the use of some ships with mine-breathing capabilities, they could only rely on temporary mobilized civilian ships. Compared with the demand for large-scale warfare, there was still a big gap in the existing mine-laying capabilities in China. In this case, the special mine-laying ship ship came into being. Since the early 1970s, the Navy has proposed the idea of ??constructing a special mine-laying ship. In the late 1970s, the PLA Navy proposed the development of special mine-laying ships to strengthen the capabilities of mine-laying operations. In 1981, the General Staff and the National Defense Office issued a development task and its tactical technical task book for the Type 918 (Worley-Wolei-class) mine-laying ship. The 708 Research Institute of the China Ship Research Institute was responsible for the overall design. The main equipment was developed by relevant professional research institutes. In June 1984, the 918 type mine-laying ship of Dalian Hongqi Shipyard was started. In December of the same year, the mine system joint test on land of the mine system was successful. In December 1986, the 918 type mine-laying ship was launched. After one year of testing, it was confirmed that the accuracy and speed of the ship's actual mines met or exceeded the original design requirements. By January 1988, the official signature was handed over to the ship. Only one ship was built, string number: 814 (Liaoyang number, once named Luzhou, served in the North Sea Fleet).
The mission of the Type 918 Breeze is to serve as a task for offshore and strait water mines (especially suitable for the Bohai Strait). It can also be used as a target ship for sea training with other ships. In addition, the ship also has a certain supply capacity.
Usually the 918 type mine can be used with surface ships or submarine training: as a target ship, because its hull is relatively large. Moreover, the internal space is relatively abundant, and it is more suitable as a training ship and a target ship. In addition, this type of ship has a lifting arm and other facilities to provide supplies for ships at sea. Or carry out transportation and resupply tasks between the port and the island.
The core part of the 918 ship is the mine-laying system. According to the requirements of the Navy, the 918 type mine-laying ship should have the following capabilities: separate and mixed loading of different types and sizes of mines; program-controlled mines can be implemented by the cloth controller to maximize the mechanization of the mine. In general, it is necessary to be able to strictly control the position of the mine and achieve the purpose of blocking the enemy without blocking it, so as to facilitate wartime use and post-war mine clearance. Once mines are needed, it means that the situation has reached a very tight juncture. If the fleet can't quickly mine, it is very likely that the mine can't be completed before the war broke out. There is no terminal loading and unloading equipment. This is due to the possibility of war evacuation before the war. It is difficult to ensure the integrity of the terminal facilities during the war. The type of ship should have the ability to ship mines at the general terminal or even at sea. The mine-breeding ship is equipped with a large-span jib crane. It can be used for mine-free lightning compensation and mine-loading under general sea conditions. The ship is equipped with vertical and horizontal two-way controllable mechanized lightning system, which can be used for live broadcast of mines. The ship is equipped with the corresponding operating equipment, power system, its control device and fin stabilizers required for the mine operation in the high sea conditions, so that the ship has good seaworthiness and can be in high sea conditions. Under the safe navigation, even in the relatively high sea conditions can still carry out mine operations.
The CCTV system, the navigation command system for determining the position and the layingpoint, and the computer-controlled automated mine-laying system, can accurately print the mine position during the mine to provide reliable information for future mine clearance. In comparison, the overall performance of the 814 Breeze ship is close to the world's advanced level in the 1980s, and the mine-laying efficiency is 7 times higher than that of the traditional mine-laying ship.
The No. 814 mine has a total length of 94.9 meters, a ship width of 14.4 meters, a draft of 4 meters deep, a full displacement of more than 2,500 tons, a host of 4 diesel engines of 6400-5, a maximum speed of 19 knots, a cruising force of 8,000 nautical miles at 14 knots, and a combat capacity of 180. people. The ship can carry up to 300 different types of mines. The self-defense weapon is a 37mm double-tube semi-automatic gun with a maximum range of 8.5km. The most fire-resistant 3km 25mm double-tube semi-automatic gun is also available. Air defense missiles. The mine is also equipped with search, navigation and fire control radars.
The completion of the special mine-laying ship No. 814 shows that the PLA Navy attached great importance to the mine war. However, the construction of only one of this type of mine warship is puzzling. In addition, how useful the ship is, it is also debatable. Because of the implementation of defensive mines along the coast, there are a large number of small ships and civilian ships. If there is an offensive mine in the open sea, the target of the special mines is obvious, the concealment is poor, the action is slow, and it is difficult to protect itself. This may be the reason why only one dedicated mineboat is built.
The development of the 918 type mine-laying ship made up for a blank of equipment for the Chinese navy, and its performance fully met or exceeded the original design goal. However, at the same time as the ship was developed, built, and served, the international situation has undergone major changes. The Bohai Strait is no longer as threatened as it used to be, and there is no need to increase the number of mine-laying ships. Therefore, the 918 type mine-laying ship was built only one ship, becoming the only type of the People's Navy and the only one dedicated mine-laying ship. Although this type of mine-laying ship has no successor products, its accumulated experience and technology in the process of development and use have already and will continue to contribute to the improvement of China's naval mine warfare capabilities.
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