The 1/6 rule for tank spacing is based on the sum of what dimensions?

The 1/6 rule for tank spacing is based on the sum of what dimensions?

• A. Average diameter
• B. Sum of their diameters
• C. Largest diameter
• D. Sum of their heights

Answer: (B)

The one-sixth spacing rule uses the sum of the tanks’ diameters. You add the two diameters (D1 + D2) and take one-sixth of that total to get the minimum edge-to-edge distance between the tanks. This approach ties separation to the overall size of both tanks, reflecting how larger tanks contribute more radiant heat and fire potential, and ensures there is enough clearance to reduce interaction between tanks and to allow access for firefighting. For example, if one tank is 10 ft in diameter and the other is 6 ft, the sum is 16 ft, so the minimum spacing would be about 2.7 ft.

The one-sixth spacing rule uses the sum of the tanks’ diameters. You add the two diameters (D1 + D2) and take one-sixth of that total to get the minimum edge-to-edge distance between the tanks. This approach ties separation to the overall size of both tanks, reflecting how larger tanks contribute more radiant heat and fire potential, and ensures there is enough clearance to reduce interaction between tanks and to allow access for firefighting. For example, if one tank is 10 ft in diameter and the other is 6 ft, the sum is 16 ft, so the minimum spacing would be about 2.7 ft.