How should the working pressure in pressure pipelines be understood?
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GB150-1998 \"Steel Pressure Vessels\" stipulates: \"Operating pressure refers to the highest pressure that may be reached at the top of the vessel under normal operating conditions.\" ” So how should the working pressure in pressure pipelines be understood? Instance question: Our company uses pumps to transfer this substance from surface storage tanks (with a gauge pressure of 0.3 MPa at the pump outlet, the medium being alcohol at room temperature, and a pipe diameter of DN50) to storage tanks on the fourth floor. First of all, these two storage tanks are at atmospheric pressure; are the pipes considered pressure pipes?
Pressure pipelines are defined as tubular devices that use a certain pressure to transport gases or liquids. They include pipes with a maximum operating pressure of 0.1 MPa (gauge pressure) or more, used for transporting gases, liquefied gases, steam, as well as liquid media that are flammable, explosive, toxic, or corrosive; these pipes also have a maximum operating temperature equal to or higher than their standard boiling point, and their nominal diameter is greater than 25 mm. According to this definition, it should not be considered a pressure pipeline. (Alcohol’s boiling point is 78 degrees)
Alcohol is flammable and its pressure is greater than 0.1 MP; I believe it falls under the category of pressure pipelines
The working pressure is indicated as gauge pressure; this pipeline is classified as a pressure pipeline.