While the Chinese Navy had more than 110 submarines in service in the mid-1980s, the total number of submarines believed to be in serviceable condition went down from 63 in 1990 to 48 in 1995. China built a total of 84 Romeo-class submarine from 1962 to 1984, with production of this obsolete design continuing for years after R-class had been scrapped from the Soviet navy. The PLAN has retired all of its Whiskey class submarines and most its Romeo-class submarines, built using Soviet designs that were based on the German Type-21 U- boat of 1944. The actual number of operable Romeo-class units is difficult to assess, since none of these submarines spends more than a few days at sea each year, and because of the general shortage of trained crews. Construction of their replacements -- the "Ming-class" (which is actually a remodeled R-model) and Song-class submarines -- is proceeding at the rate of about one a year.
In 1959, China began to build the improved version of the medium-sized conventional-powered submarine and conventional powered missile submarine transferred from USSR. In order to quicken the pace of using China-made components, and to make preparations for overall copying, in the construction of these two types of submarines, special attention was paid to the import of design drawings and materials of the submarine's principal accessory equipment. Thus, the import of equipment and devices was reduced; anything that could be produced in China was not allowed to be imported. When the USSR withdrew her specialists and suspended assistance, China decided to cancel some naval research projects in order to concentrate on building these two types of submarines. The production of medium-sized conventional-powered submarine began in Jiangnan and Wuchang shipyards, the first one was completed in December 1965 in Jiangnan shipyard. Later, this type of submarine was also built in Huangpu and Fulin shipyards, and this was the largest batch production of submarine in China.
Because the materials and equipment of submarine supplied by USSR were increasingly incomplete, one after another, during the construction process components had to be replaced by home-made products. So, while the State was organizing the production of these two types of submarines, close attention was also paid to the production of materials and accessory equipment for submarine to ensure the needs of batch production of submarines in succession. In addition, during the process of building the submarines, some major technical problems, such as welding of specialty steels, propeller cavitation erosion, and ship hull structural strengthening were also solved.
China's submarine force benefited significantly when the chaos of the Cultural Revolution was replaced by the rigid and total militarization of Chinese society in the early 1970s. This change was due partly to a growing perception of threats from the Soviet Union. Production rates of the PLAN's "Romeo"-class submarines trebled, to approximately six per year by 1974, and by 1978, China had more than 60 of these ships.
In the early seventies, China not only completed the assembly production work of these submarines, but also carried out a plan of using completely home-made parts in submarine equipment and material production. At the same time, improvement in type and technology, such as improving the guided missile launching apparatus of the improved version of conventional-powered ballistic missile submarine and increasing the air-conditioning and refrigerating capacity of the improved version of conventional-powered submarine, were carried out.
In 1976, Li Jiangqiu and Yang Huansheng of No.701 Institute, as the engineers in charge, made improved design for adding anti-ship guided missile in the improved version conventional-powered submarine, and Feng Yunlong as the engineer in charge, designed the ship board pressure-resistant missile storage and launching tube of the submarine. The retrofit work began in Wuchang shipyard in 1980, and in 1985, the retrofitted submarine successfully made the missile sea launch test. In the late 1980s, research personnel made improvements in decreasing the submarine noise, the noise level being lowered by 12 decibels from its original level, thus enhancing the submarine concealment capability and increasing the sonar's effective distance.
According to a 2002 estimate by the US Department of Defense, China had roughly 30 obsolete Soviet-designed ROMEO Class submarines remaining in the force. According to this estimate, by 2010 China will have withdrawn the ROMEO Class submarines from service.
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