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GA - Long distance pipelines: GA1 (a), GA1 (b), and GA2;
GB - Public pipelines: divided into GB1 gas pipelines and GB1 (PE pipelines);
GB2 (1) Thermal pipeline, GB2 (2) Thermal pipeline;
GC class - Industrial pipelines: divided into GC1 class, GC2 class, and GC3 class.
GD class - power pipeline: GD1 class and GD2 class.
Definition of various pressure pipelines
Grade A and GA (long-distance pipelines)
1. GA1a class: Long distance (oil and gas) pipelines that meet one of the following conditions should be classified as GA1a class:
(1) Transporting toxic, flammable, explosive gases or liquid media with a design pressure greater than or equal to 10MPa;
(2) The conveying distance is greater than or equal to 1000km, and the nominal diameter is greater than or equal to 1000mm.
2. GA1b category: Long distance (oil and gas) pipelines that meet one of the following conditions should be classified as GA1b category:
(1) Transporting toxic, flammable, and explosive gas media with a design pressure greater than or equal to 4.0 MPa and less than 10 MPa;
(2) Transporting toxic, flammable, and explosive liquid media with a design pressure greater than or equal to 6.4 MPa but less than 10 MPa;
(3) The conveying distance is greater than or equal to 200km, and the nominal diameter is greater than or equal to 500mm.
GA2: Long distance transportation (oil and gas) pipelines other than GA1.
Note: Special provisions have been made for the requirements and conditions of the unit permit level for pressure sealing and on-site anti-corrosion in GA long-distance pipelines (license rules attachments A5 and A6).
B-class, GB (ordinary pipe)
Public pipelines refer to natural gas and thermal pipelines used for public utilities or civilian purposes within urban or town areas, classified into GB1 and GB2 levels.
GB1 level: Gas pipeline. GB1 is set in GB1 (specifically for PE pipes);
2. GB2: Thermal pipelines are divided into the following two categories
(1) Design pressure greater than 2.5mpa;
(2) Public heat pipes with a design pressure of less than or equal to 2.5mpa.
C. GC (Industrial Pipeline)
Industrial pipelines refer to process pipelines, public works pipelines, and other auxiliary pipelines belonging to industrial facilities used for transporting process media. It is divided into GC1, GC2, and GC3 categories. The specific classification content complies with GB/T 20801-2006 "Pressure Piping Code - Industrial Piping".
GC1： Industrial pipelines that meet one of the following conditions are GC1:
(1) The toxicity level specified in GB 5044-85 for occupational exposure toxicity classification should be extremely hazardous media, high-risk gas media, and high-risk liquid media, with working temperatures higher than the standard boiling point;
(2) The fire risk specified in GB 50160-2008 "Code for Design and Fire Protection of Petrochemical Enterprises" and GB 50016-2006 "Code for Design and Fire Protection of Buildings" should be a, b flammable gases or flammable liquids (including liquefied hydrocarbons) with a design pressure greater than or equal to 4.0MPa;
(3) Transport fluid media with a design pressure greater than or equal to 10.0MPa, or a design pressure greater than or equal to 4.0MPa, and a design temperature greater than or equal to 400 ℃.
GC2 level:
Except for GC3 level pipelines specified in Article 3, industrial pipelines with a degree of poisoning hazard, fire risk (flammability), and design pressure and temperature lower than GC1 level are classified as GC2 level pipelines.
GC3 level:
Transport non-toxic, non flammable fluid media, industrial pipelines with a design pressure less than or equal to 1.0 MPa and a design temperature greater than -20 ℃ but less than 185 ℃, GC3 grade pipelines. Analysis of Industrial Pipeline Classification Diagram:
D-level, GD (power pipe)
The power pipelines used for transporting steam and steam water in thermal power plants are divided into GD1 and GD2.
1. GD1 level: Design pressure greater than or equal to 6.3 MPa, or design temperature greater than or equal to 400 ℃.
2. GD2 level: The design pressure is less than 6.3 MPa and the design temperature is less than 400 ℃.
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