Steel-lined PTFE pipeline inspection and detection method

The product specifications and dimensions are first inspected according to the PTFE lined pipe standard, and then the steel lined PTFE lining layer is tested and inspected: the pipes and fittings are subjected to a hydraulic test at 1.5 times the design pressure, and the PTFE liner layer is 100% after the hydraulic test Ground integrity inspection, the leakage point inspection method adopts electric spark test, and the appearance of anti-corrosion paint is inspected. The thickness of the paint surface is uniform. In the steel-lined PTFE pipeline, the operating temperature is -20~200℃, the operating pressure is ≤2.5Mpa, and the allowable negative pressure is -0.09Mpa for DN≤250mm and -0.08Mpa for DN>250mm.