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...