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Nanjing Duble Metal Equipment Engineering Co., Ltd. (stock code: 830984) was established in August 2005, and completed joint-stock restructuring in 2012. The company is mainly engaged in the design, manufacture, installation and maintenance of non-ferrous metals, stainless steel, carbon steel and composite pressure vessels, pressure pipeline and components and tower internals, as well as undertaking of chemical engineering, pharmaceutical engineering, energy-saving projects, environmental protection projects, environmental monitoring units and system projects, and the design, manufacture, installation and technical services of complete sets of equipment. The company was registered at No. 8, Debang Road, Jiangning Development Zone - a national level development zone. The company is a national high-tech enterprise, with the license for designing and manufacturing of pressure vessels (A1/A2), the ASME U/U2 Certificates, and the Class A and B pressure pipeline manufacturing license; it has passed the product safety registration of Class A and B explosive clad steel plates for pressure vessels, as well as the certifications of ISO9001, ISO14001 and the OHSAS18001. It is one of the drafters of the NB / T47002-2009 “pressure vessel explosive welding composite boards”, NB / T47028-2012 “pressure vessel nickel and nickel alloy forgings", GB16749" pressure vessel bellows expansion joints” and other national (industrial) standards.

The company has a subsidiary - Jiangsu Duble Engineering Co., Ltd., which is mainly focused on evaporation and crystallization technologies and processes, chemical and synthetic material technologies and processes, new materials and new energy technologies, MFV high-efficiency tray patented technology, industrial waste "zero emission" technology, industrial exhaust gas purification integrated solutions, and so on, providing technology development, design, consulting, technical tracking services, project management, and general contracting. The subsidiary Nanjing Sanbang New Material Technology Co., Ltd., is mainly engaged in the manufacturing and sale of explosive metal clad plates, metal expansion joints, non-ferrous metal pressure pipelines and structural parts; the company covers an area of 300 mu, with a total construction area of 80,000 square meters, and 5 specialized production plants, which are respectively, nonferrous metals and heat exchanger plant, heavy vessel plant, pipe fittings plant, tower internals and metal explosive composite material plant. The company employs a total of nearly a thousand employees, 38% of which are technical personnel specialists, and more than a hundred hold intermediate professional titles or higher.

The company has a provincial enterprise technology center in Jiangsu, a provincial engineering technology research center and an enterprise academician workstation, and has set up a chemical engineering laboratory, a materials analysis laboratory, a welding and heat treatment laboratory, and an efficient mass transfer and separation laboratory with many well-known universities and research institutes. It also has more than 100 patent certificates.

The company’s domestic customers cover PetroChina, Sinopec, Datang, Shenhua, State Power and other large enterprises; the foreign customers are distributed in Europe, Asia and America and other parts of the world.

Duble people cherish the ideal of "running an enterprise with unique characteristics, and building a well-known brand"; we adhere to the corporate spirit of “honoring virtues, upholding lofty ideas, and revitalizing the country”; we have established the quality policy of “quality first, honesty oriented, customer satisfaction, technological innovation, continuous improvement, and company development”; upholding the business philosophy that “customer need is our pursuit”, we are trying to build an international well-known brand, and striving for improving the international competitiveness of China's equipment manufacturing industry.