Safety Yellow: Physical Hazards (low beams, railings, posts, etc.). Cranes and Hoists, and Material Handling Equipment.
Safety Blue: Electrical Controls, Special Repair Areas (scaffolding, compressors, dryers, valves, ovens ,etc.).
Safety Green: Safety and First Aid (first aid kits, gas masks)
Safety Purple: Radiation hazards (burial storage areas, disposal cans, contaminated equipment, containers, etc.)
Safety Orange: Use to identity dangerous machine parts, safety starting buttons, gears, rollers, etc.
Safety Red: Use to identity Fire Protection Equipment (exit signs, alarm boxes, extinguishers), Danger (hazardous contents, barricades, etc.), and Stop (emergency buttons and switches on machinery).
ASA Recommended Markings
Red: For fire fighting equipment, fire protection apparatus and sprinkler systems.
Yellow: For hazardous materials which are flammable, toxic, poisonous, corrosive, high temperature or under high pressure.
Green: For non-hazardous materials, non-poisonous, non-flammable, moderate temperature, under low pressure, such as drinking water, syrups, glycols, etc.
Blue: For protective materials, for preventing or reducing hazards of dangerous materials (other than fire fighting).
The following color banding of pipes, to identify specific materials more readily, is suggested for industry as a preferred standard. Pipes which are painted The same color as The room should be banded every twenty feet and at least once in every room.
Acid or Alkali - Yellow-Red-Yellow
Fuel Oil - Yellow-Black-Yellow
Ammonia - Purple-Red-Purple
Gas - Yellow-Brown-Yellow
Brine - Label Only
Hot City Water - Green-Yellow-Green
Cold City Water - Green
Hot Lake Water - Blue-Yellow-Blue
Cold Lake Water - Blue
Oxygen - Green Line-Yellow Stripe
Compressed Air - Green-Aluminum-Green
Process Oil - Yellow
Electrical Conduit - Gray
Steam, Hi-Pressure - White-Orange-White
Fire Protection - Red
Steam, Lo-Pressure - Orange-White Orange
Freon - Purple-Yellow-Purple
Waste - Black