China is the third largest consumer market for liquefied petroleum gas in the world. Liquefied gas water transportation is an economical and safe transportation method. However, the total amount of domestic liquefied petroleum gas transportation currently accounts for only 20% of total consumer demand, mainly subject to LPG. The number of transport vessels is seriously insufficient, and the existing LPG transport vessels are in poor condition and cannot meet the needs of the LPG water transport market. Large-scale full-pressure LPG carrier is the preferred ship type for LPG transportation in China's offshore and inland rivers. LPG storage tanks are the core equipment on LPG carriers. They are large pressure vessels carrying dynamic loads. They have high technical requirements and are difficult to manufacture. Large full-pressure LPG carrier tank products are mainly built by foreign companies.
In the late 1990s, Xiagong Chusheng Special Purpose Manufacturing Co., Ltd. took the lead in manufacturing the first 2×1000 cubic meter full-pressure storage tank for the “Sushun” LPG carrier of Nanjing Oil Transportation Company, and initially accumulated the construction of LPG storage tanks. experience. Since 2005, Xiagong Chusheng Special Purpose Manufacturing Co., Ltd has made great efforts to overcome the key technical problems in the selection of new materials, safety technology, welding materials and processes, and new heat treatment processes in the construction of large full-pressure LPG carrier tanks. A marine LPG storage tank product with independent intellectual property rights has been formed. Marine
LPG Storage Tank products have been built for nearly 10 LPG carriers such as Zhejiang Changjiang Energy Company “Changneng” and Norwegian Schogan Group “No Problem”. The material selection is based on domestic use. For the first time, WISCO produced low-weld crack-sensitive high-strength steel 07MnCrMoVR, which made the whole ship cost significantly lower than imported products. In the post-weld heat treatment technology, the overall heat treatment method was adopted for the first time. The residual stress of the welding before and after the heat treatment was tested by the blind hole method. The average stress reduction was 69%, and the welding residual stress was greatly reduced.
