Definition of pressure pipelines
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1. The \"Regulations on the Safety Supervision of Special Equipment\" (State Council Order No. 549), issued and implemented by the State Council on May 1, 2009, defines its scope as pipelines for gas, liquefied gas, or steam media whose maximum operating pressure is greater than or equal to 0.1 MPa (gauge pressure), as well as liquid media that are flammable, explosive, toxic, corrosive, and whose maximum operating temperature is greater than or equal to their standard boiling point; such pipelines must also have a nominal diameter of more than 50 mm. 2. The definition in GB/T20801 is: “Pressure pipeline” refers to a pipeline in which the maximum working pressure is greater than or equal to 0.1 MPa for gaseous, liquefied gas, or steam media, or for liquid media that are flammable, toxic, or corrosive and whose maximum working temperature is greater than or equal to their standard boiling point; such pipelines also have a nominal diameter of more than 25 mm. For pressure pipelines, is the pipe diameter DN50 or DN25? Whose advice should I follow? 3. Is there a GC3 grade for industrial pressure pipelines?
Generally, the regulations of the State Council are followed, with other designs serving as references. Industrial pipes are classified into GC1, GC2, and GC3.
Could someone confirm whether a circulating water pipeline with a pressure of 4 MPa is considered a pressure pipeline?
The current list of special equipment can be found in the announcement issued by the former General Administration for Quality Supervision, Inspection and Quarantine (No. 114, 2014); the pipe diameter is DN50； According to the provisions of TSG D0001, it is classified into three grades: GC1, GC2, and GC3
The regulations from 2009 are not the latest; pressure pipelines certainly have the GC3 grade
A circulating water pipeline at 4 MPa is not considered a pressure pipeline.
It is based on the guidelines set by the State Council, but your data from 2009 isn’t the most up-to-date; the current standards require a diameter of no less than 50 mm.