Changlin pipeline, stock code 872482, pipeline non-stop opening plugging equipment design, manufacturing, sales and construction services unit, the company has advanced level of precision machinery and equipment, attaches importance to talent training, inject new force for the technical team, independent research and development of a number of products and obtained patents. The company has passed the ISO9001, ISO14001, OHSAS18001 system certification, and obtained the MANUFACTURING license of A1(2), A2 (1), B1, B2 valves, B1 (2), B2 pressure pipe components issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, as well as the Class A qualification of pressure sealing for long distance (oil and gas) pipelines. It is a member unit of China petrochemical material resources market and a member unit of tier 1 supplier network.