Pipe color coding systems are standard methods of labeling piping on vessels and facilities. Standard labeling allows easier and quicker identification of pipelines by crew members. Standard systems are published by several organizations, while many companies have their own.
| Secondary | Black | Blue | Brown | Green | Grey | Maroon | Orange | Silver | Red | Violet | White | Yellow | |
| Primary | |||||||||||||
| Black (Waste) | None | Black Water | Waste Oil | Bilge Water | Exhaust Gas | None | None | None | None | None | Grey Water | Sewage Contaminated | |
| Blue (Fresh water) | None | None | Fresh Water, Sanitary | Potable Water | Distillate | None | Gas turbine Wash Water | Feed Water | None | Cooling fresh water | Chilled water | Condensate | |
| Brown (Fuel) | Heavy fuel oil | Aviation fuel | None | None | None | None | None | None | None | Biological fuel | Gas turbine fuel | Diesel fuel | |
| Green Sea Water | None | Decontamination water | Sea water, sanitary | None | None | Maroon | None | None | Red | Ballast | None | Cooling water | |
| Gray Non-flammable Gas | Black | None | Oxygen | Inert gas | Nitrogen | None | Refrigerant | Low pressure compressed air | None | High pressure compressed air | Control or regulated air | Breathing air | Breathing air |
| Maroon Sounding tubes | Waste Media | Potable Water | Fuel | Sea Water | Non-flammable Gas | None | Oil other than fuel | Steam | Firefighting | Acids, Alkalis | Ventilation | Flammable gas | |
| Orange Oil other than fuel | None | Thermal Fluid | Lubricant for Gas turbines | Hydraulic fluid | None | None | Lubricant for steam turbines | None | Gear oil | None | Lubricant for internal combustion engines | ||
| Silver Steam | Steam for heating | None | None | None | None | None | None | None | None | None | Exhaust steam | Supply steam | |
| Red Firefighting | None | None | None | Firefighting water | Firefighting gas | None | Sprinkler water | None | None | Spray water | Firefighting powder | Firefighting foam |
The
U.S. Coast Guard color codes valve handles and levers on cutters as follows:
| Dark blue | Potable water |
| Dark gray | High pressure air|- |
| Light gray | Nitrogen |
| Dark green | Salt water |
| Light green | Oxygen |
| Purple | JP-5 |
| Red | Fire main/plugs |
| Striped red and green | Steam |
| Tan | Low pressure air |
| White | Steam |
| Yellow | Fuel oil/gasoline |
| Striped yellow and black | Lube oil |
Pipe color coding systems are standard methods of labeling piping on vessels and facilities. Standard labeling allows easier and quicker identification of pipelines by crew members. Standard systems are published by several organizations, while many companies have their own.
| Secondary | Black | Blue | Brown | Green | Grey | Maroon | Orange | Silver | Red | Violet | White | Yellow | |
| Primary | |||||||||||||
| Black (Waste) | None | Black Water | Waste Oil | Bilge Water | Exhaust Gas | None | None | None | None | None | Grey Water | Sewage Contaminated | |
| Blue (Fresh water) | None | None | Fresh Water, Sanitary | Potable Water | Distillate | None | Gas turbine Wash Water | Feed Water | None | Cooling fresh water | Chilled water | Condensate | |
| Brown (Fuel) | Heavy fuel oil | Aviation fuel | None | None | None | None | None | None | None | Biological fuel | Gas turbine fuel | Diesel fuel | |
| Green Sea Water | None | Decontamination water | Sea water, sanitary | None | None | Maroon | None | None | Red | Ballast | None | Cooling water | |
| Gray Non-flammable Gas | Black | None | Oxygen | Inert gas | Nitrogen | None | Refrigerant | Low pressure compressed air | None | High pressure compressed air | Control or regulated air | Breathing air | Breathing air |
| Maroon Sounding tubes | Waste Media | Potable Water | Fuel | Sea Water | Non-flammable Gas | None | Oil other than fuel | Steam | Firefighting | Acids, Alkalis | Ventilation | Flammable gas | |
| Orange Oil other than fuel | None | Thermal Fluid | Lubricant for Gas turbines | Hydraulic fluid | None | None | Lubricant for steam turbines | None | Gear oil | None | Lubricant for internal combustion engines | ||
| Silver Steam | Steam for heating | None | None | None | None | None | None | None | None | None | Exhaust steam | Supply steam | |
| Red Firefighting | None | None | None | Firefighting water | Firefighting gas | None | Sprinkler water | None | None | Spray water | Firefighting powder | Firefighting foam |
The
U.S. Coast Guard color codes valve handles and levers on cutters as follows:
| Dark blue | Potable water |
| Dark gray | High pressure air|- |
| Light gray | Nitrogen |
| Dark green | Salt water |
| Light green | Oxygen |
| Purple | JP-5 |
| Red | Fire main/plugs |
| Striped red and green | Steam |
| Tan | Low pressure air |
| White | Steam |
| Yellow | Fuel oil/gasoline |
| Striped yellow and black | Lube oil |