Classification of pipelines into low, medium, and high pressure
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Previously, the boundaries for low-pressure, medium-pressure, and high-pressure pipelines were defined as follows: pressures below 1.6 MPa were considered low-pressure, 1.6–10 MPa as medium-pressure, 10–100 MPa as high-pressure, and pressures above 100 MPa as ultra-high-pressure. Nowadays, the definitions are as follows: low-pressure pipelines have a nominal pressure not exceeding 2.5 MPa; medium-pressure pipelines have a nominal pressure of 4–6.4 MPa; high-pressure pipelines have a nominal pressure of 10–100 MPa; and ultra-high-pressure pipelines have a nominal pressure exceeding 100 MPa. Which of these definitions is more correct, according to you?
The original one is probably correct; the later ones are not continuous.
For low, medium, and high levels, not only pressure should be considered, but also the properties of the medium in the pipeline.
In the quotas for industrial pipeline construction, the pressure grades of pipelines are classified as follows: low pressure: 0＜P≤1.6MPa; medium pressure: 1.6＜P≤10MPa; high pressure: 10MPa＜P≤42MPa; steam pipelines: P≥9MPa; high pressure is also applied when the operating temperature is ≥500°C.
The definition of pressure pipelines is quite strict; it’s not simply the presence of pressure that determines whether a pipe is a pressure pipeline, but rather the severity of the consequences that could arise if the pipe fails. This is because pressure pipelines are classified as one of the seven types of special equipment that are subject to regulation. They are those pipes that transport toxic and harmful substances, as well as flammable, explosive, high-temperature and high-pressure materials. Low pressure, medium pressure, and high pressure are generally classified according to specific pressure levels. They are those pipes that transport toxic and harmful substances, as well as flammable, explosive, high-temperature and high-pressure materials. Low pressure, medium pressure, and high pressure are generally classified according to specific pressure values: low-pressure pipelines < 1.6 MPa ； Medium-pressure pipeline 1.6-6.4MPa ； High-pressure pipeline 10-42MPa ； UHP pipelines: 42–100 MPa; EHP pipelines: above 100 MPa.
So, based on 3MPa, is this considered medium pressure or low pressure? Is there a gap?