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What color should a CO2 pipe be labeled according to ANSI?
The CO2 isn't for fire suppresion, should it still be red or do you go with the standard black on yellow? I've found a few ANSI blurbs online but nothing specific.
Red and white is fire.
Materials Inherently Hazardous:
-Extreme Temperatures or Pressures: yellow background with black letters.
Extreme Temperatures or Pressures. This classification includes materials which when released from the piping would have a potential for inflicting injury or property damage by burns, impingement, or flashing to vapor state.
While CO2 is not not inherently toxic or dangerous in low concentrations it can displace O2 in a spaces and can be in that case immediately hazardous to life and health therefore cause injury.
Materials of Inherently Low Hazard:
Gas or Gaseous Admixture: blue background white letters.
Materials of Inherently Low Hazard. This classification includes all materials which are not hazardous by nature, and are near enough to ambient pressure and temperature that people working on systems carrying these materials run little risk through the release of these materials.
It would be prudent to designate the piping with yellow/black.
Yeah, the guy above did a good job of retro-finding the link to the ASME spec I originally sited. However his concluding interpretation is wrong. Gasses under extreme pressure are inherently hazardous and hence should be colored YELLOW AND BLACK, not blue.
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