Dongying Lianfeng Petroleum Machinery Co., Ltd

Dongying Lianfeng Petroleum Machinery Co., Ltd is a specialized manufacturer of oil drill pipe joints (tool joints) located in the Dongying Economic and Technological Development Zone, Shandong Province, China — the hinterland of Shengli Oilfield, the second-largest oilfield in China. Founded in 2007, the company was established with a clear focus on the petroleum drilling industry, targeting the production of high-quality drill pipe joints for domestic and international markets. The facility covers more than 30 mu (approximately 5 acres) and operates with a modern production environment staffed by qualified technical researchers and senior management personnel. Annual production capacity exceeds 100,000 pairs of drill pipe joints across all steel grades and connection types. Lianfeng holds API certification for Specification 5DP (drill pipe), Specification 7-1 (rotary drill stem elements), and Specification 7-2 (threading and gauging of rotary shouldered connections), as well as ISO 9001 quality management system certification. Key production equipment includes a Speria pre-pumping vacuum heat treatment furnace, CNC lathes (CGK-46), profiling lathes, pipe lathes, drilling machines, and a 1,200-ton hydraulic press. Quality assurance capabilities include raw material chemical analysis, mechanical performance testing, magnetic particle flaw detection, automatic ultrasonic flaw detection, Brinell and Rockwell hardness testing, vertical concentricity testing, thread measurement instruments, and thread gauges. The company serves oil drilling contractors and drill pipe manufacturers both domestically in China and internationally, supplying joints for use in onshore and offshore drilling operations.