Is a hot water pipeline a pressure pipeline?
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Operating parameters for the hot water pipeline: operating pressure of 1.0 MPag, operating temperature of 95°C; design pressure of 1.3 MPag, design temperature of 120°C. 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. In this definition, are the maximum operating pressure and maximum operating temperature the design pressure or the operating pressure? If considered based on design parameters, hot water pipes are classified as pressure pipes; but if considered based on operating parameters, they are not considered pressure pipes? I wonder how everyone approaches filling out the pipeline form?
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. Your hot water pipes belong to this type
Work pressure is operational pressure. For hot water, the key factor is this: a liquid whose maximum operating temperature is higher than or equal to the standard boiling point. The current parameters of this pipe do not meet the requirements for this standard, so it does not belong to GC industrial pipes. However, GB2 and GCD also have hot water media; these two are classified by range rather than by parameters.
Just increase the operating temperature a bit more
Looking at the operating temperature, the defined operating temperature is higher than or equal to the standard boiling point; in the case of hot water, this means the operating temperature is above 100 degrees. Therefore, this does not constitute a pressure pipeline, and it is not subject to GB2 standards