Issues regarding the classification and registration of pressure pipelines
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The company currently has a R&D system in which the system pressure is 35 Mpa, and the pipelines are of DN40 size (outer diameter of 70 mm, wall thickness of 14 mm). According to the relevant standards, such pipelines do not fall under the category of pressure pipelines; therefore, they are also not covered by the GC classification system, and no certification or registration is required. Is this understanding correct? Catalog of special equipment: Pressure pipelines refer to tubular devices that use a certain pressure to transport gases or liquids. They are defined as pipelines with a maximum operating pressure of 0.1 MPa (gauge pressure) or more, carrying gases, liquefied gases, steam, or liquids 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 50 mm or more. Except for pipes with a nominal diameter of less than 150 mm and a maximum operating pressure of less than 1.6 MPa (gauge pressure), as well as the pipes that form part of the equipment used for transporting non-toxic, non-flammable, and non-corrosive gases. Among them, the safety supervision and management of oil and gas pipelines shall also be carried out in accordance with laws and regulations such as the Work Safety Law and the Oil and Gas Pipeline Protection Law. What are the standards for classifying pressure pipelines, industrial pipelines, power pipelines, etc.? It seems a bit chaotic! TSG D3001-2009 \"Rules for Licensing the Installation of Pressure Pipelines\"; TSG D0001-2009 \"Regulations for Safety Supervision of Pressure Pipelines – Industrial Pipelines\"; GB 20801.1~6-2006 \"Codes for Pressure Pipelines – Industrial Pipelines\"
Pressure pipelines that are not included in the catalog of special equipment
I think your understanding is correct; the key lies in the inner diameter of the pipe. As long as it is less than 50 mm, no matter how high the pressure, it is not considered a pressure pipeline
It does not belong to pressure pipelines; your understanding is correct
Yes, when we were renewing the certificates for our pipes, the inspector specifically mentioned that although some of those pipes are thin, the pressure applied to them is extremely high; yet they are not classified as pressure pipes. In fact, it’s quite dangerous if such pipes burst.
If I want to modify a DN80 pipeline by having it branch into two DN40 pipes after exiting the device at the DN80 size, and then those DN40 pipes recombine into a DN80 pipe that connects to the downstream equipment, does such a piping system count as a pressure pipeline?
Hello, if I want to modify a DN80 pipeline – with the DN80 pipe leading from the equipment and then branching into two DN40 pipes, which later reconnect together to form a DN80 pipe that connects to the downstream equipment – does such a piping system count as a pressure pipeline?
Hello, if I want to modify a DN80 pipeline – with the DN80 pipe leading from the equipment and then branching into two DN40 pipes, which later reconnect together to form a DN80 pipe that connects to the downstream equipment – does such a piping system count as a pressure pipeline?