What color is the frangible bulb on an ordinary sprinkler head?

What color is the frangible bulb on an ordinary sprinkler head?

• A. Red
• B. Orange
• C. Blue
• D. Green

Answer: (B)

The key idea is that the color of the frangible glass bulb on a sprinkler head indicates its operating temperature rating. For an ordinary, standard head, the bulb is orange. The color coding helps installers and inspectors quickly confirm the head will activate at the intended temperature for typical occupancies. Other colors correspond to different temperature ratings, so they indicate heads designed for different environments or requirements. In short, orange is the color used to denote the standard, ordinary rating on a sprinkler head.

The key idea is that the color of the frangible glass bulb on a sprinkler head indicates its operating temperature rating. For an ordinary, standard head, the bulb is orange. The color coding helps installers and inspectors quickly confirm the head will activate at the intended temperature for typical occupancies. Other colors correspond to different temperature ratings, so they indicate heads designed for different environments or requirements. In short, orange is the color used to denote the standard, ordinary rating on a sprinkler head.