Type 925 Dajiang Class (Submarine Rescue Ship)
The Dajiang-class AS is a large multipurpose, ocean-going support vessel equipped with a large hydraulic deck crane and a helicopter landing deck. All three vessels in the class were built at the Shanghai Shipyard Jiangnan (Kiang-nan) Dock Company. These large multirole submarine support ships can serve both as alongside tenders and salvage/rescue ships. Can carry two salvage/rescue submersibles, handled by a large crane on the foredeck.
The "July 18 Project" is named after project date - July 18, 1967. On that day, the Commission of Science, Technology and Industry for National Defense submitted a plan for the establishment of the Ocean Surveying Fleet to the Central Committee. It is scheduled to be officially approved in June of the following year, codenamed "Seven-eighth Project", aimed at orbiting the Earth, satellites, launch vehicles, spacecraft, etc. Flying spacecraft for measurement, control and recycling.
In 1974, the State Council determined that Jiangnan Shipbuilding became the main factory of the "July 18 Project" and assumed the construction tasks of the Type 3 ship, namely the space survey ship "Yuanwang 1", "Yuanwang 2" and Yuanwang Survey Ship "Xiangyanghong 10" and salvage lifeboats "J302", "J502", "J121".
Thse were the first large-scale integrated ship owned by the Chinese Navy. Its main mission is to implement surface water for intercontinental missiles and warhead wrecks. Salvage and serve as a telemetry mission; perform surface salvage and rescue astronauts on spacecraft; complete hydroacoustic measurement of intercontinental missile landings and perform sonar arrays for surveying ships; implement three-level rescue and deepwater rescue for submarine accidents, and take into account rescuing ships that was damaged in the water.
The Chinese Navy designed the Dajiang class to fill a need for splashdown retrieval in the intercontinental missile testing, deepsea rescue and, in the future, astronaut recovery. Although its primary function was submarine support and rescue, the other functions of the Dajiang could include supporting the submarine-launched ballistic missile test program as a reentry vehicle recovery ship.
The ship is equipped with a variety of conventional and special scientific research electromechanical equipment, and the entire workload is equivalent to three 10,000-ton bulk carriers. The ship is 156.2 meters long, has a design waterline length of 140 meters, a width of 20.6 meters, a design draft of 6.8 meters, and a displacement of more than 10,000 tons. Two 6615 kilowatt low-speed diesel engines and five 630 kilowatt diesel generator sets are installed on it. The cruising speed can reach 18 knots and the maximum speed can reach 20 knots. It can be seen from the data and performance that this ship has excellent capabilities.
The ship is equipped with deep diving rescue boat, 56 ton hydraulic folding arm crane, life saving bell, three pressure reduction holds at a pressure of 25 kg/cm2, two large helicopters with hangar, take off and landing platform and navigational equipment, fast workboats, 1,000 meter deep water anchor, 200 meter deep water large sized positioning anchor and facilities to serve the position pinpointing operation at sea. The design and construction of this ship were the same as those of ocean going surveying ship.
In its submarine rescue capacity, the Dajiang employed a deep-submergence rescue vehicle (DSRV). A DSRV was identified at the Shanghai Shipyard Jiangnan Dock Company in September 1979, and all three Dajiang units have DSRV deck cradles for storing the vehicle. Although no details of the Chinese DSRV were initially available, it appeared to be similar to the DSRV for the US Navy. Equipment of this kind is usually designed for depths beyond 200 meters and indicated China's intention to carry out long-range, deep-water submarine operations.
The first ship started construction in 1975 and was completed in November 1979 for use. In order to reduce the number of ship types and speed up construction, by one report her overall design was basically the same as that of the ocean going surveying ship, though. This design is also used for several other auxiliaries.
During the Chinese ICBM test in the early 1980s, one of the Type 925 Dajiang class was converted as missile instrumentation support ship and temporarily renamed as Yuanwang-3 to support the test, and after the conclusion of the test, the unit was converted back to its original role with the name consequently changed back.
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