Issues regarding the regular inspection of PTFE-lined pressure pipelines

Regarding the regular inspection of pressure pipes lined with PTFE, it is first necessary to determine the specific application scenario and pressure rating of the pipes. Generally, in the case of pressure-bearing equipment, it is necessary to comply with **relevant safety technical specifications and standards. TSG D0001 is the \"Regulations on the Safety Technical Inspection of Boilers\" within the \"Regulations on the Safety Supervision of Special Equipment\", while TSG R0005 is the \"Regulations on the Safety Technical Inspection of Pressure Vessels\". If pressure pipelines lined with PTFE fall under the category of pressure vessels, they should be inspected primarily in accordance with TSG R0005. In addition, the general requirements for pressure pipelines in TSG D0001 must also be referred to. It should be noted that in practical operations, in addition to following these general **standards and procedures, it may sometimes be necessary to refer to other standards related to materials, such as those related to non-metallic pipes. Since polytetrafluoroethylene (PTFE) is a non-metallic material, its inspection and testing methods may differ from those for metallic materials; therefore, there may also be other industry standards for non-metallic materials or standards specifically designed for pipes with non-metallic linings. For example, for plastic piping systems used in the chemical industry, GB/T 32118 \"Plastic Piping Systems for Chemical Processes\" may be referred to. Since the specific inspection standards and methods may change as technology evolves and standardization organizations make revisions, it is recommended to consult the local special equipment safety supervision authorities or professional inspection agencies when conducting regular inspections on pressure pipelines, in order to obtain the latest guidance documents and standard requirements. At the same time, the appropriate inspection standards and methods should also be determined based on the actual parameters of the pipes in use (such as operating pressure, properties of the medium, temperature, etc.). Providing more detailed information on the use of the pipeline may yield more specific guidance and suggestions. .

Thank you for the answer, sir. This is because Article 4 of the TSG D0001-2009 Regulations on Safety Inspection of Pressure Piping – Industrial Piping explicitly states that non-metallic pipes are not included, and Section 1.4C of GBT 20801.1 also excludes non-metallic pipes or their linings; it is not clear to which standard pipes with metal linings actually belong I still need to ask the testing agency