One issue is the Fire Sprinkler Systems.....
Sprinkler heads, other than ornamental or plated heads, should be color coded, as outlined in NFPA 13, subsection 6.2.5 . The color identification may be by a single dot on the deflector, painting of the toggle arms, or for bulb type sprinklers, the color of the glass bulb.
The Color-coding by the temperature-classification is as follows.......



