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Nanjing Duble metal equipment engineering Co., LTD. is registered in the national development area—the economic and technological development area of the joint-stock company in Jiangning. The company is a high and new national technology enterprise, with three kinds of high pressure vessel (A1) manufacturing qualification, three types of low-voltage containers (A2) design qualification, ASME U steel qualification, chemical petrochemical and medicine industry professional grade B, general contracting qualification professional grade c design in municipal industry, the grade A and B pressure pipe manufacturing qualification, grade A manufacturing qualification of metal bellows expansion joint, passing the grade A and B of product safety register with the pressure vessel of explosion composite steel plate and the ISO9001 quality system and OHSAS18001:2007 occupational health and safety management system certification. The company built five big market service platform with foundation and energy equipment, strategy and energy equipment, total package in technical skill and unit device, pipe fittings and composite board and non-standard marked with non-ferrous metal products, the international market and foreign companies. Mainly engaged in titanium and titanium alloy, nickel and nickel alloy, copper and copper alloy, zirconium, tantalum, aluminum, stainless steel, duplex stainless steel and the compound material storage, reaction, heat exchange and separate containers, research and development, design, manufacture and installation of pipe fittings and product, metal composite material processing and marketing, salt brine and distillation separation and purification of the thick alkali liquid of engineering design, contracts, technical service and project management, on behalf of the goods and technology import and export business. Products are mainly used in oil refining and petrochemical, chemical, environmental engineering, ocean engineering, metallurgy, medicine, pesticide, the nuclear power industry, etc. Company has the special material equipment factory, heavy-in equipment factory, heat exchanger factory, pipe fittings factory and metal explosion composlte materials factory. The total area is two hundred thousand square meters, with a total construction area of seventy-five thousand square meters, the existing staff is more than near one thousand of which the intermediate title is near a hundred, the proportion of the personnel with specialized technical is 42%. Our company built a provincial enterprise technology center, provincial engineering technology research and development center, enterprise academician workstation and the laboratory used in material analysis experiment, welding heat treatment, efficient mass transfer ,separation ,corrosion and protection are set up by many famous universities and research institutes ,having almost a hundred items. According to the product ,our company provides professional numerical control and automatic equipment for the factory, mainly has: plasma automatic welding machine, tube and tube plate automatic welding machine and more than 10 ultrahigh pressure numerical control hydraulic bilge machine. Nc(numerical control) 120 mm thick plate and 8 special series of roller machine with 40 mm non-ferrous metal, high-speed nc drill press of 5 m, 3.5 m series, 4 * 12 m CNC plasma cutting machine, CNC water cutting knife everything ultrahigh pressure of 150mm, 60mm series; hydraulic press of 8000 tons, 1600 tons series; nearly 50 crown block of 150 tons, 50 tons, 32 tons and so on. The electro-hydraulic controlled by microcomputer servos universal test machine, impact test enginery, desktop direct reading spectrometer type, etc. People in Duble has the ideal of "do characteristic enterprise, create famous brand". Adhere to the enterprise spirit of "advocating morality, devoting to future, promoting the state". Set up the quality policy with "quality first, the good faith as basic, make customer satisfied; by the science and technology innovation, continuous improvement, for the development of the company". With the management idea of "the customer's demand is our pursuit", creates the international famous brand.