"Last week's Coffee Break Training discussed fire protection water tank heating and insulation properties in accordance with National Fire Protection Association (NFPA) 22, 'Standard for Water Tanks for Private Fire Protection'. We'll look at some of the components associated with the tank and their functions. The installation in the photograph is a detail from a 15,000-gallon (56,780-L) aboveground water storage tank that supplies an automatic sprinkler system. The tank discharges into a 250-gallon per minute (950-liter per minute) electric drive fire pump that supplies a wet pipe fire sprinkler system protecting an Ordinary Hazard, Group 2 storage and retail occupancy."
Coffee Break Training - Fire Protection Series No. FP-2014-16
United States Fire Administration: http://www.usfa.fema.gov/