Dip tanks and reservoirs must be enclosed in fire-rated construction of what duration?

• A. 1 Hour
• B. 2 Hours
• C. 3 Hours
• D. 4 Hours

Answer: (A)

Fire resistance duration is the time an enclosure can withstand fire exposure before its integrity is compromised. For dip tanks and reservoirs, the minimum fire-rated construction required is a one-hour rating. This level provides a basic barrier to slow the spread of fire involving the liquids in the dip area and gives responders a window to intervene, without imposing the heavier and costlier protections that higher ratings would entail. Ratings of two, three, or four hours represent greater protection than what is typically required for these installations, which is why one hour is the correct standard.