GB-7231-87 "Ultimate identification colors and identification symbols for industrial pipelines"
1 General principles
1.1 In order to unify the coloring of pipelines in chemical enterprises to achieve safety and anti-corrosion This regulation is specially formulated with the aim of being eye-catching, beautiful and renovated.
1.2 This regulation applies to gas and liquid transport pipelines in chemical plants.
1.3 This procedure conforms to the principles of national standard GB-7231-87 “Super identification colors and identification symbols of industrial pipes”; the colors adopt the provisions of national standard GB-S181-; 82. (Two additional colors: black and white) In order to be basically consistent with the colors of the two national standards used, for example, the green of GB7231-87 is equivalent to the light green of GB3182-32. Please find attached a comparison tablen color samples (see Appendix A for details).
1.4 Industrial pipelines imported from abroad must be colored in accordance with the original design regulations.
2 Basic Identification Colors
2.1 Basic Identification Colors are used to identify the fluid and its condition in the tube.
2.2 Basic identification colors and their meanings
See Table 1 for basic identification colors and their meanings. ………………
Oxygen line - (blue) acetylene (white) fresh water (green) compressed air (gray) fire line (red), nitrogen (**)
Red - steam, fire water
Green - desalinated water
Black - industrial water, cooling water
Blue - water pipe 'air
Oxygen present in the condensation water will affect the operation of the boiler.
After the condensed water from the power plant has completed its workgarlic into the steam turbine, the temperature and pressure will be greatly reduced, and finally it is discharged into the condenser and is cooled by the cooling water and condensed into water. . The water in the condenser has been deoxygenated, and the oxygen content of the condensed water is very low. The condensed water enters the deaerator directly and the oxygen will react with the substances in the deaerator, causing the deaerator to fail.