What are the common causes of leakage in high-pressure drainage pipes during operation
Hits: 416 Time: 2026.01.26
Common causes of leakage in high-pressure drainage pipes include interface sealing failure, pipe wall damage, corrosion perforation, and excessive pressure, which require targeted investigation and repair. Interface leaks are often caused by aging seals (such as hardened rubber rings), loose connections (such as corroded flange bolts), or installation deviations (such as insufficient socket depth). The investigation can be carried out by listening to sound (water flow sound at the leakage site), soap water detection (foaming after application), and positioning. When repairing, if the rubber ring is aging, it needs to be replaced with a sealing ring of the same specification. If the flange is loose, the bolts need to be tightened again (according to torque standards). If there is a socket deviation, it needs to be disassembled, reinstalled, and the support pier reinforced. Pipe wall damage is often caused by external impacts (such as collisions with construction machinery) and soil settlement leading to stress cracking. To investigate, use a pipeline endoscope or pressure test (if the pressure drop exceeds 0.05MPa/hour, it is considered a leak). For small damages (with a pore size<10mm), epoxy repair agents can be used to seal them. For large damages, the pipe section needs to be cut and replaced, and a pressure test should be conducted after welding. Corrosion perforation is common in metal pipelines, divided into electrochemical corrosion (caused by soil moisture) and medium corrosion (acidic and alkaline wastewater). Anti corrosion layer detection instruments (such as PCM detectors) are used to locate the corrosion point for investigation. When repairing, local corrosion can be treated with epoxy fiberglass anti-corrosion, and large-scale corrosion needs to be replaced with corrosion-resistant pipelines (such as composite pipes). At the same time, sacrificial anodes (such as zinc blocks) are buried in the soil to prevent electrochemical corrosion. If the pressure exceeds the standard and leaks due to overpressure operation (such as pump station pressure loss of control), the valve should be closed first to reduce the pressure, and after replacing the ruptured pipe section, the pressure control system (such as pressure transmitter, safety valve) should be checked to ensure that the pressure is stable within the allowable range. After repair, a closed water test is required. If there is no leakage after holding the pressure for 1 hour, it is considered qualified.
Zhanggehou Rubber and Plastic Base, Jing County, Hebei Province
