For pressure pipelines with a diameter of DN50 or larger, which need to be resistant to acids, those with a steel lining are used. Can such pipelines be submitted for inspection as pressure pipelines? Is it not possible to proceed with the inspection?

For pressure pipelines with a diameter of DN50 or larger that are used to carry media under certain pressure and where such media are corrosive (acid-resistant materials are required), it is usual to use corrosion-resistant materials or steel pipes with lining to ensure safety and reliability during long-term operation. Such pipelines fall under the category of special equipment. In accordance with relevant Chinese laws and standards (such as the Special Equipment Safety Law and the Regulations on the Safety Management of Pressure Pipelines), they must undergo safety inspections and regular checks. For steel-lined pressure pipes that must be acid-resistant, inspection registration is mandatory; in other words, you must submit an inspection application to the local administrative authority responsible for the safety supervision of special equipment. The inspection application process usually involves submitting relevant design documents, records of the manufacturing process, material certification, as well as records of quality inspections for welding and lining, in order to facilitate technical reviews and on-site inspections. If your inspection application is rejected, it may be because: 1. The submitted documents are incomplete or do not meet the requirements. 2. The design, manufacture, or installation of the pipeline does not comply with ** or relevant industry standards. 3. No relevant design permit, manufacturing permit, or installation permit has been obtained. 4. The designated inspection agency does not have the qualifications to inspect such pressure pipelines. The solution to this problem is to carefully examine the relevant requirements to ensure that all preparatory work complies with the regulations, and to consult qualified inspection agencies or regulatory authorities regarding the specific procedures for submission and the required documents. Resubmit the inspection application following the prescribed procedures to ensure that the inspection can proceed smoothly. If you have questions regarding the regulations or need professional assistance, you can seek guidance from specialized inspection agencies for special equipment or the relevant administrative departments. .

There seems to be a requirement; I forgot whether it’s 50 or 60