| RED = FIRE PROTECTION AND SPRINKLER PIPING | - POST INDICATOR VALVES FOR SPRINKLER SYSTEMS
| YELLOW OR ORANGE - DANGEROUS MATERIALS | - FLAMMABLE LIQUIDS GASOLINE, NAPHTHA, FUEL OIL, ETC.
- POISONOUS GASES CHLORINE GAS, AMMONIA, SULPHUR DIOXIDE, ETC.
- CORROSIVE LIQUIDS ACIDS, ALKALIS
- STEAM, WATER, OR AIR AT HIGH TEMPERATURES AND PRESSURES.
GREEN = MATERIALS LOW IN TEMPERATURES AND PRESSURES: NON-POISONOUS NON-FLAMMABLE
| | BLUE = PROTECTIVE MATERIALS FOR PREVENTING OR REDUCING HAZARDS OF DANGEROUS MATERIALS | - INCLUDES SPECIAL GASES TO COUNTERACT OR NEUTRALIZE POISONOUS FUMES, WHICH ARE PIPED FOR RELEASING IN EVENT OF DANGEROUS PROTECTIVE MATERIAL OTHER THAN FIRE PROTECTION
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