May 20, 2024 – Chengdu 102 Oil Depot Branch Pipeline Three-Axis High-Definition Magnetic Flux Leakage Internal Inspection Project

On May 20, 2024, our company was entrusted by Tianjin Maiping Company with the urgent task of conducting a triaxial high-definition magnetic flux leakage inspection—complete with accompanying nitrogen operations—on the Chengdu 102 Oil Depot branch pipeline (Φ168.3 mm × 7.31 km). This aging pipeline, commissioned in 2002 and designed for a pressure rating of 4.4 MPa but currently operating at pressures ranging from 0.3 to 2 MPa, required meticulous planning. Within 24 hours, our team successfully deployed equipment and personnel, held a specialized workshop to address the technical challenges associated with pigging small-diameter pipelines, and developed a robust plan to ensure the smooth passage of cleaning pigs through the thermally bent pipe sections (with a minimum bend radius of 1.5D). On May 23, we executed the operation precisely: at 10:58 a.m., the nitrogen-driven oil push commenced; by 11:45 a.m., end-of-line gas flow detection met all required standards. At 3:00 p.m., we transitioned to the oil depot site to begin pushing the cleaning pig, successfully completing the entire process by 3:20 p.m. on May 31. Throughout the project, we maintained rigorous adherence to pre-construction risk assessments and emergency protocols, ensuring "zero leaks and zero delays" while enabling the seamless implementation of intelligent inspections along the gasoline delivery pipeline. As a result, we not only delivered a technically sound and efficiently executed solution but also established a replicable standard operating procedure tailored specifically for small-diameter refined oil pipelines. Our efforts earned high praise from the client, who commended us for our "solid technical expertise and highly effective execution."