Marine and Offshore Pipe Marking Guide April 2014 | Page 2

MARINE & OFFSHORE PIPE MARKING

Ships & other sea vessels use a pipe marking system that is internationally recognized & defined by the ISO 14726 & ISO (DIS)14726-2 standard.
MAIN COLOR

ADDITIONAL COLOR

{

Marine Pipe Marking Standards have main colors (defined by ISO 14726) to indicate groups of
similar substances. Additional color bars (defined by ISO/DIS 14726-2) are added to indicate
specific substances. The additional color should be surrounded by the main color and have
a width smaller than that of the main color.

MARINE PIPE MARKING COLOR GUIDE
FRESH WATER

(blue)

NON-FLAMMABLE GASES

(grey)

FIRE FIGHTING

Fresh Water

Non-flammable gases

Fire fighting

Condensate from heating system

Oxygen

Fire-fighting fresh water

Fresh water - sanitary

Breathing Gas

Fire-fighting sea water

Cooling fresh water

Nitrogen

Fire-fighting CO2 gas

Feed water

Refrigerant

Sprinkler water

Distillate

Pressure air HP

Fire-fighting powder

Potable water

Breathing air

(red)

Fire-fighting foam

Chilled water
Condensate

WASTE MEDIA

(black)

FUEL

(brown)

STEAM

Waste media

Fuel

Steam

Black water

Heavy fuel

Steam for heating

Waste oil

Liquid gas

Bleeder steam

Bilge water

Petrol

LP drains

Exhaust gas

Diesel fuel

(silver)

Supply steam

Sewage

Exhaust steam
HP drains

OILS OTHER THAN FUEL

AIR IN VENTILIATION SYSTEMS (white)

SEA WATER

Oil other than fuel

Air in ventilation systems

Sea water

Used oil

Natural exhaust air

Ballast water

Thermal oil

Supply air, atmospheric

Cooling sea water

Dirty oil

Natural supply air

Sanitary sea water

Lubricating oil

Mechanical exhaust air

(orange)

(green)

Hydraulic oil

FLAMMABLE GASES
Flammable gasses
Hydrogen
Acetylene
Mixture of Propane/Butane

(yellow)

ACIDS & ALKALIS

(violet)

Acids & Alkalis

MASSES (DRY & WET)

(copper)

Masses

It is advised to use directional arrows to indicate the directional flow of the pipe contents.
In addition, the usage of text will help avoid any confusion regarding the contents of pipes.
This guide is for general information purposes only. It is not a substitute for review of applicable