22/07/2025
Pipe color coding is a standardized way of identifying the contents of pipes in various industries (like construction, plumbing, oil & gas, chemical plants, etc.) for safety and efficiency. The colors indicate the type of fluid or gas being transported.
Here’s a general guide to pipe color coding as per international and Indian standards:
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🌐 International Standard (ISO / ANSI A13.1)
Color Indicates
Green Water
Blue Compressed Air
Red Fire-fighting fluids
Yellow Flammable fluids (e.g., petrol)
Orange Toxic or corrosive fluids
Brown Combustible fluids
Purple Acids or alkalis
Black Waste or drainage
White / Gray Steam or other gases
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🇮🇳 Indian Standard (IS 2379 – Pipelines Identification Colours)
Base Color Fluid Type Identification Band
Light Green Water (potable, cooling, boiler feed) Dark Green band
Light Blue Air (compressed, instrument) Blue band
Signal Red Fire-fighting water No band or White letters
Yellow Ochre Flammable fluids (oil, gas) Brown or Black band
Aluminum / Silver Steam Black band
Violet Acids / Alkalis White letters or band
Black Waste / Sewer / Drain White band
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💡 Additional Tips
Arrows are usually placed on the pipe to show flow direction.
Labels are often added with the name of the fluid for clarity.
Some industries use custom codes, especially inside private facilities, but these are often based on the above.
