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Recently, a suspected leak was detected in the seawater line at Dalian Petrochemical Company; there was significant water accumulation underground in the plant area, and visible water flow was present in the wells, posing safety hazards. Upon receiving the commission, Jinma dispatched a professional leak detection engineering technical team to Dalian Petrochemical to carry out leak detection work. After inspecting the site, the following difficulties were identified: (1) The difficulty level is high; preliminary survey and excavation work was carried out without any obvious leakage points being found. (2) The environment is complex; some pipelines are close to the pipe tray in the duct, and excavation can easily lead to landslides. (3) It is noisy and located near the main road inside the factory, which affects normal sound testing. (4) Depth of burial: The burial depth is generally around 3 meters. (5) Large pipe diameter; the diameter of the seawater pipeline is DN1200. (6) The water pressure is low; the pressure gauge on site shows approximately 0.3 Mpa. In light of the conditions on site, our company carried out thorough and detailed planning and investigations: (1) On-site inspection: Based on the actual conditions at the site, the project team organized a meeting with the company’s experts to discuss the situation and consult together in order to accurately locate the source of the leakage. (2) Regional pipeline network investigation: Advanced detection methods are employed, including the sound inspection method, flow measurement method, correlation method, as well as pipeline detection techniques, to accurately identify areas with abnormalities in the pipelines. (3) Determine the area where leakage is occurring: Use advanced instruments for acoustic testing of valve stems and the road surface to identify the location of the leakage. (4) Correlation analysis testing: For areas where road surface sound detection is not possible, correlation testing and related analyses are carried out. (5) Precise location of the leak point: By comprehensively analyzing the results of acoustic testing, road surface inspection, and other related tests, the area where leakage occurs is narrowed down, allowing for the precise identification of the leak point. (6) Post-repair verification: Re-measure the repaired leak points to ensure there are no abnormal leaks in the pipeline. The company’s technical staff carried out thorough and meticulous planning; after on-site inspections and inspections of the pipeline network, they accurately located the source of the leak. A suspected leak was found at one of the valve chambers along the seawater line, where there was a strong sound of leaking water, and the waveforms from the relevant instruments showed abnormalities. Based on their experience, the skilled technicians accurately identified the location of the leak, repaired it, and then conducted a follow-up check. To address this leakage issue, the Jinma team took into account the conditions on site and utilized their years of inspection experience along with various professional instruments to accurately locate the source of the leakage in a timely manner. This approach prevented waste of resources and potential safety hazards, reduced losses for the client, and earned recognition from the client who commissioned the work! Jinma Company accurately locates leak points, leveraging 20 years of technical expertise. To address the complex challenges associated with pipeline installation in petrochemical enterprises, such as complex external environments, intricate plant layouts, high noise levels, and strong interference, Jinma Company uses non-destructive testing methods to achieve a horizontal positioning accuracy of ≤±1m and a vertical positioning accuracy of ≤0.5m for leak locations. This enables the company to detect leaks regardless of pipe diameter – from DN15 to DN2000 – ensuring that any leak can be identified. ●Regardless of the material of the pipe – whether it is steel, cast iron, cement, or even ceramic – as long as there is a leak, the location of the leak can be detected. ●Regardless of the medium flowing within the pipeline, whether it is a water pipe, an oil pipe, or a gas pipe, any leak can be detected.