Colour marking |
| Waste media | | Fresh water | | Fuel |
| Black (BK) | | Blue (BU) | | Brown (BN) | |
| | | Black water |
| | | Fresh water, sanitary |
| | | Heavy fuel (HFO) |
| BK | BU | BK | |
BU | BN | BU | |
BN | BK | BN | |
| | | Waste oil/Used oil |
| | | Potable water |
| | | Aviation fuel |
| BK | BN | BK | |
BU | GN | BU | |
BN | BU | BN | |
| | | Bilge water |
| | | Destillate |
| | | Biological fuel |
| BK | GN | BK | |
BU | GY | BU | |
BN | VT | BN | |
| | | Exhaust gas |
| | | Gas-turbine wash water |
| | | Gas-turbine fuel |
| BK | GY | BK | |
BU | og | BU | |
BN | WH | BN | |
| | | Grey water |
| | | Feed water |
| | | Diesel fuel (MDO) |
| BK | WH | BK | |
BU | SR | BU | |
BN | YEO | BN | |
| | | Sewage, contaminated |
| | | Cooling fresh water |
|
| BK | YEO | BK | |
BU | VT | BU | |
|
| | | | Chilled water |
|
|
BU | WH | BU | |
|
| | | | Condensate |
|
|
BU | YEO | BU | |
|
|
| Sea water | | Non-flammable gasses | | Oil other than fuel |
| Green (GN) | | Grey (GY) | | Orange (OG) | |
| | | Decontamination water |
| | | Oxygen |
| | | Thermal fluid |
| GN | BU | GN | |
GY | BU | GY | |
OG | BU | OG | |
| | | Sea water, sanitary |
| | | Inert gas |
| | | Lubricating oil for steam turbines |
| GN | BN | GN | |
GY | BN | GY | |
OG | GN | OG | |
| | | Ballast water |
| | | Nitrogin |
| | | Hydraulic fluids |
| GN | VT | GN | |
GY | GN | GY | |
OG | GY | OG | |
| | | Cooling sea water |
| | | Refrigirant |
| | | Lubricating oil for steam turbines |
| GN | YEO | GN | |
GY | MN | GY | |
OG | SR | OG | |
|
| | | Compressed air LP (low pressure) |
| | | Lubrication oil for gears |
|
GY | OG | GY | |
OG | VT | OG | |
|
| | | Compressed air HP (high pressure) |
| | | Lubrication oil for engines |
|
GY | RD | GY | |
OG | YEO | OG | |
|
| | | Control air/regulating air |
|
|
GY | VT | GY | |
|
| | | | Breathing air |
|
|
GY | WH | GY | |
|
| | | | Breathing gas |
|
|
GY | YEO | GY | |
|
|
| Steam | | Fire fighting | | Air in ventilation systems |
| Silver (SR) | | Red (RD) | | White (WH) | |
| | | Steam for heating purposes |
| | | Fire fighting water |
| | | Dicharge air |
| SR | BK | SR | |
RD | GN | RD | |
WH | BK | WH | |
| | | Exhaust steam |
| | | Fire fighting gas |
| | | Mechanical supply air, cold |
| SR | WH | SR | |
RD | GY | RD | |
WH | BU | WH | |
| | | Supply steam |
| | | Sprinkler water |
| | | Natural exhaust air |
| SR | YEO | SR | |
RD | OG | RD | |
WH | BN | WH | |
|
| | | Spray water |
| | | Atmospheric air |
|
RD | VT | RD | |
WH | GN | WH | |
|
| | | Fire fighting powder |
| | | Mechanical exhaust air |
|
RD | WH | RD | |
WH | GY | WH | |
|
| | | Fire fighting foam |
| | | Decontaminated suplly air |
|
RD | YEO | RD | |
WH | MN | WH | |
|
|
| | | Mechanical recirculated air |
|
|
WH | OG | WH | |
| Flammable gases |
|
| | | Mechanical supply air, warm |
| Yellow (YEO) | |
|
WH | SR | WH | |
| | | Hydrogen |
|
| | | Smoke clearance |
| YEO | BU | YEO | |
|
WH | RD | WH | |
| | | Acethylene |
|
| | | Conditioned supply air |
| YEO | GY | YEO | |
|
WH | VT | WH | |
| | | Liquid gas |
|
| | | Natural supply air |
| YEO | VT | YEO | |
|
WH | YEO | WH | |