Question

A warehouse has a total of 35,000SF of floor area. An automatic sprinkler system is to be installed in the warehouse. The water supply for fire suppression will be stored in an onsite storage tank. The hose demand includes both inside and outside locations. Calculate the water demand and the total water storage needed if: a) The warehouse is classified as an Ordinary 1 Hazard with a Density Demand of 0.13 GPM/ft2 and an Overage Factor of 1.2. b) The warehouse is classified as an Extra 2 Hazard with a Density Demand of 0.34 GPM/ft2 and an Overage Factor of 1.3.

Answer 1

Given:

• Area, A = 35000 ft^2
• ASOP (Area Of Sprinkler Operation)
• HSD (Hose Stream Demand)

a.]

• Density demand, d = 0.13 GPM/ft2
• Overage factor, k = 1.2
• For ordinary 1 hazard category, HSD = 250 GPM

Water demand, D = Area (A) * Density Demand (d) = 35000 * 0.13 = 4550 GPM (Gallons per minute)

Total water storage needed = (Area * Density Demand * overage factor) + HSD = 35000*0.13*1.2 + 250 = 5710 GPM

b.]

• Density demand, d = 0.34 GPM/ft2
• Overage factor, k = 1.3
• For extra 2 hazard category, HSD = 500 GPM

Water demand, D = Area (A) * Density Demand (d) = 35000 * 0.34 = 11900 GPM (Gallons per minute)

Total water storage needed = (Area * Density Demand * overage factor) + HSD = 35000*0.34*1.3 + 500 = 15970 GPM