Water Treatment Plant Color Guide

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Pipe Type
Type of Liquid / Gas
Water Lines: Raw water Green
Settled or clarified water Aqua
Finished or potable water Dark Blue
Chemical Lines: Alum or primary coagulant Orange
Ammonia White
Carbon slurry Black
Caustic Yellow w/ green band
Chlorine gas or solution Yellow
Fluoride Light blue w/ red band
Lime slurry Light green
Ozone Yellow w/ orange band
Phosphate compounds Light green w/ red band
Polymers or coagulant aids Orange w/ green band
Potassium permanganate Violet
Soda ash Light green w/ orange band
Sulfuric Acid Yellow w/ red band
Sulfur Dioxide Light green w/ yellow band
Waste Lines: Backwash waste Light Brown
Sludge Dark Brown
Sewer (sanitary or other) Dark Gray
Other Lines: Compressed Air Dark Green
Gas Red
Other Pipes Light Gray


Wastewater Treatment Plant Color Coding

Sludge Lines: Raw Sludge Brown w/ black bands
Sludge recirculation or suction Brown w/ yellow bands
Sludge drw off Brown w/ orange bands
Sludge recirculation discharge Brown
Gas Lines: Sludge Gas Orange (or Red)
Natural Gas Orange (or Red) w/ Black bands
Water Lines: Nonpotable Water Blue w/ black bands
Potable Water Blue
Water for heating digestors or buildings Blue with a 6 in. (150mm) red band space 30 in. (760mm) apart
Other Lines: Chlorine Yellow
Sulfur Dioxide Yellow w/ Red bands
Sewage (wastewater) Gray
Compressed Air Green

Also include an arrow to indicate direction of flow. Also a Second helpful guide would be our Pipe Marking Guide.

————————– START of Ten States Standards, Section 2.14, PIPE COLOR CODING ————————–
To facilitate the identification of piping in plants ad pumping stations it is recommended that the following
color scheme be utilized:

Water Lines
Raw or Recycle — Olive Green
Settled or Clarified — Aqua
Finished or Potable — Dark Blue

Chemical Lines
Alum or Primary Coagulant — Orange
Ammonia — White
Carbon Slurry — Black
Caustic — Yellow with Green Band
Chlorine (Gas or Solution) — Yellow
Chlorine Dioxide — Yellow with Violet Band
Fluoride — Light Blue with Red Band
Lime Slurry — Light Green
Ozone — Yellow with Orange Band
Phosphate Compounds — Light Green with Red Band
Polymers and Coagulant Aids — Orange with Green Band
Soda Ash — Light Green with Orange Band
Sulfuric Acid — Yellow with Red Band
Back Wash Waste — Light Brown
Sludge — Dark Brown
Sewer — Dark Gray

Compressed Air — Dark Green
Gas — Red
Other Lines — Light Gray

In situations where two colors do not have sufficient contrast to easily differentiate between them, a six-inch band of contrasting color should be on one of the pipes at approximately 30-inch intervals. The name of the liquid or gas should also be on the pipe. I some cases it may be advantageous to provide arrowsindicating the direction of flow.
————————– END of Ten States Standards, Section 2.14, PIPE COLOR CODING ————————– Found Here

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