Is there such a thing as pressure pipelines for non-metallic pipes? ? Is it necessary to classify according to certain standards (such as pressure pipelines)? ? ?

Follow the regulations outlined in the catalog, whether it is non-metallic or metallic

The classification of pressure pipelines has nothing to do with the material; it is determined solely by the medium being transported, as well as temperature and pressure

The definition for the 2nd floor is clear; pressure pipelines are not distinguished as metal or non-metal

Agree with the person above. This leads to a question: Have you come across any examples of non-metallic materials being used in pressure pipelines?

The natural gas pipelines installed in cities today are pressure pipelines, and non-metallic PE pipes are generally used for underground installation.

Regarding the scope, the screenshot of the catalog of special equipment on the second floor makes things quite clear. As for non-metallic pipes, the most common type is the gas GB1 polyethylene pipe used for underground installation

Sure, for example, fiberglass reinforced plastic pipes

The concept of pressure pipelines is broad; according to Article 4 of the TSG D0001-2009 Regulations on Safety Supervision of Pressure Pipelines (Industrial Pipelines), non-metallic pipelines at least do not fall under the GC category of industrial pipelines that are considered pressure pipelines.

Non-metallic pipes are included in the 2014 catalog of special equipment; the safety regulations for pressure pipelines currently do not cover non-metallic pipes, but they will be included sooner or later, similar to ASME B31.3

In response to the question posed: 1. Article 4 of the \"TSG-D0001-2009 – Safety Technical Supervision Regulations for Pressure Pipelines – Industrial Pipelines\" specifies that non-metallic pipes are not covered by this standard; therefore, if non-metallic pipes are used, the classification system GC1 does not apply. 2. The Regulations on the Safety Supervision of Special Equipment define pressure pipelines as “tubular devices that use a certain pressure to transport gases or liquids. These include pipelines in which the maximum operating pressure is 0.1 MPa (gauge pressure) or higher, for gases, liquefied gases, steam, or liquid media that are flammable, explosive, toxic, corrosive, and have a maximum operating temperature equal to or higher than their standard boiling point; such pipelines also have a nominal diameter of more than 25 mm.” It is clear that non-metallic pipelines can also be considered pressure pipelines. In fact, there are special permits for non-metallic pipelines, and my company holds such qualifications; large enterprises require these qualifications when issuing tenders. 3. Since non-metallic pipes can be pressure pipes, are there any standards specifically applicable to pressure pipes? The answer is no, but non-metallic pipes made from different materials have their own standards, such as GB/T 18998.1 \"Polyvinyl chloride piping systems for industrial use\" and others. These standards specify the required thickness of the pipes under various operating conditions. Domestic standards are generally based on ISO standards, ensuring high reliability; they also serve as a basis for design work in engineering firms. These standards also serve as the basis for issuing licenses for special equipment. 4. Generally, the nominal pressure of fully plastic pipes does not exceed 2.0 Mpa; it is usually 1.0 Mpa or 1.6 Mpa. The operating temperature generally does not exceed 120°C, except for polytetrafluoroethylene. The nominal pressure of steel-lined plastic or steel-reinforced plastic can be very high, approaching that of metals. I don’t know much about other non-metallic materials such as ceramics and glass; they are used relatively less in pipe applications and more in equipment. I hope this helps; feel free to ask any other questions related to plastic pipe valves as well.