Do dense-phase conveying pipelines fall under the category of pressure pipelines?
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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, 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. There are 2 pipes for dense-phase transportation in the factory, used to transport plastic pellets; their diameters are DN150 and DN200. The pressure during material transfer is around 0.2 Mpa. I’m not sure whether these pipes qualify as pressure pipes
It should be a pressure pipeline (because the pipeline contains a mixture of compressed air and plastic particles)
It’s not a pressure pipeline; if you’re worried, consult the local special inspection agency
After consulting a design institute and conducting discussions with them, it was ultimately determined that it still falls under the category of pressure pipelines