Pipe Markings

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Pipe Markings

Pipe markings are standardized identification marks used on pipes to identify contents and flow direction. They are particularly important to the complex systems of piping found in the engine room, but may also be carried over into drawings.


Standard Colours

The most common standard is the ANSI/ASME joint code 13.1, currently in the 2007 revision (13.1 2007). ISO 14726 is another popular standard, now in the 2008 revision. Pipes will be marked with bands of the designated colours, and may be combined where carriage overlaps (i.e., firefighting fresh water). As these standards are pretty general, additional colours will be used as necessary (and properly documented).

ANSI Standards

  • RED - Fire fighting
  • ORANGE - Toxic fluids (i.e., oil)
  • BROWN - Combustable fluids (i.e., fuel)
  • YELLOW - Flammable liquids
  • GREEN - Water (Green sometimes used for seawater, with blue for freshwater)
  • BLUE - Compressed air
  • PURPLE, WHITE, GRAY, BLACK - At users discretion

ISO 14726:2008

  • BLACK - Waste
  • BLUE - Freshwater
  • BROWN - Fuel
  • GREEN - Seawater
  • GREY - Nonflamable gasses
  • COPPER - Masses

Shipboard Colours

Outside the standards, ships may adopt internal conventions for markings. Some other common colours found aboard ships include;

  • WHITE - Air (in)
  • GREY - Air (out) and non-flammable gasses, used domestic water (non-sewage)
  • SILVER - Steam
  • BLACK - Sewage

Standard Markings

  • Text sizes, per ANSI/ASME, or ISO standards
  • Directional flow arrows
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