Consultation on the classification of pressure pipelines
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Are the pipes in high-pressure carbon dioxide gas fire suppression systems, with a design pressure of 15 MPa and a diameter of DN50 or larger, considered pressure pipes? The pipes in this system are normally under no pressure; they only become pressurized when the fire suppression system is activated, but this lasts for a short time, approximately 10 seconds.
This isn’t even considered a pressure pipeline, then what is? Let’s take a look at the definition of a pressure pipeline: lol
According to the definition, it falls under the category of pressure pipelines. However, the dispute lies in the fact that these system pipelines are not under pressure under normal conditions; pressure is only generated when the fire suppression system is activated, and that too for only a short period of time. It seems that neither the quality supervision agency nor the fire department has provided a clear distinction regarding this matter.
Are you referring to high-pressure pipes, OP?
A pressure pipeline is defined by its operating pressure; as long as the operating pressure meets the specified requirements, it is considered a pressure pipeline. The regulations don’t state that pressure must be present at all times for something to be considered a pressure pipeline, right?
If the design conditions fall within the scope of pressure pipelines, then it is considered a pressure pipeline
They belong to pressure pipelines. Pressure pipelines are 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, whose medium is gas, liquefied gas, 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.
I think it falls under pressure pipelines; it is managed as such because of its importance. If one wants to classify it as something other than a pressure pipeline, I think solutions can be found by ensuring it is non-toxic, non-flammable, and does not emit corrosive gases
It feels like the pipes of the device itself! It is recommended to consult the **official website of the General Administration of Quality Supervision, Inspection and Quarantine!