Questions regarding the classification of pipeline pressure and temperature grades
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Classified by working pressure level: 2 d4 l (~\" l, l7 ^ Those with a pressure greater than 100 MPa are referred to as ultra-high pressure pipelines； Pipelines with a pressure range of 10–100 MPa are referred to as high-pressure pipelines ； Those with a pressure of 1.6–10 MPa are referred to as medium-pressure pipelines ； Those with a pressure of 0–1.6 MPa are called low-pressure pipelines ； Pipelines with working pressure below standard atmospheric pressure are called vacuum pipelines. # ?+ R; R+ u% S8 f% R2 }0 f Classified by operating temperature: Those above 370°C are referred to as high-temperature pipelines ； Those operating in the range of 370℃ to –20℃ are referred to as normal-temperature pipelines ； Pipelines with temperatures below -20°C are called low-temperature pipelines. . X2 w, H- C3 F5 W( b& n' }: Relevant standards for Y can be found in: SHS01005 \"Code for Maintenance and Inspection of Industrial Pipelines\", GB/J235 \"Specifications for Construction and Acceptance of Industrial Pipeline Projects\", etc. The above are the search results from the forum. However, regarding the classification of temperatures, some opinions seem to differ from this; is this correct? Are there any other criteria that allow for more detailed segmentation? For example, in a petrochemical plant, there might be no pipes with temperatures below -20 degrees; upon analysis, it’s likely that almost all of the pipes are at normal temperature, so such a classification doesn’t provide much clarity
1. According to the classification method for pressure pipelines, industrial pipelines are divided into GC1, GC2, and GC3 categories; the issuance of usage permits is also managed based on this classification, in line with the \"Regulations for Periodic Inspection of In-service Pressure Pipelines\". There is no need to pursue classification by high, medium, and low pressure pipelines; current piping codes no longer classify them based on pressure levels. 2. For carbon steel pipelines, they are still suitable as low-temperature pipelines at temperatures below -20 degrees; however, for other materials, the threshold of -20 degrees loses its significance. At present, there are no clear boundaries defined for pipes operating at high temperatures, normal temperatures, or low temperatures. Different materials have varying temperature ranges for use, but for the sake of ease in management, it is also possible for the person in charge to determine the temperature ranges for the pipes themselves.
Divide it yourself? There has to be some basis for this; I don’t know much about it. Does anyone have a classification they think is appropriate?
This issue also troubles me. When I was studying for the second-level constructor exam, classifications were made as well, but I’m not sure what notation was used; moreover, the normal temperature range doesn’t reach 370 either