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How to manage chemical non-metallic pipes? Please discuss that non-metallic pipes are typically constructed from heterogeneous engineering materials, and their raw materials, production processes, and structural properties differ significantly from those of traditional pipes. During the installation process, various defects such as those exceeding or falling short of the specified standards can occur. During use, problems like corrosion, aging, leakage, perforation, fracture, cracking, overpressure, overheating, deformation, and warping may arise. Numerous cases have confirmed that materials such as PVC, PVDF, ECTFE, and FRP-lined plastics exhibit phenomena such as thinning, discoloration, loss of strength, and bulging in media containing MCB-chlorobenzene hydrochloric acid and similar substances. Non-metallic pipes are also covered by the safety supervision regulations for special equipment. TSG D0001-2009 requires that, in addition to complying with its relevant provisions, non-metallic pipes must also adhere to the requirements of relevant safety technical specifications. The catalog of special equipment includes categories such as non-metallic material pipes, non-metallic pipe fittings, non-metallic flanges, non-metallic expansion joints, and non-metallic sealing elements. Enhanced monitoring, inspection, and management of non-metallic pipelines during operation are required. Common inspection methods include visual inspection (aided by magnifying glasses, endoscopes, etc. when necessary), dimension measurement, wall thickness determination using non-metallic thickness gauges, hardness testing, sampling for analysis, examination of cross-sections obtained through cutting, spark testing, penetrant testing (PT), optical microscopy, pressure testing, and sealing performance testing. I would like to ask how each of you manages it. Thank you! Which pipes require mandatory regular replacement? Which items need to be checked? How is the ratio determined? . . .