26 September 2006
Provide a bypass in accordance with NFPA 20 around all booster fire pumps (fire
pumps which take suction from a pressurized source for the purpose of boosting
Where a backflow preventer is required for a fire pump installation, it should be
located on the discharge side of the pump. The location of the backflow
preventer needs to be coordinated with local environmental requirements.
WATER DISTRIBUTION SYSTEMS.
The distribution system must be sized to accommodate fire flows plus domestic
and industrial or flushing demands that cannot be restricted during fires.
Distribution must be looped to provide at least 50 percent of the required fire flow
in case of a single break. Dead-end mains must be avoided. Distribution
systems must be designed in accordance with American Water Works
Association Manual M31 Distribution System Requirements for Fire Protection,
NFPA 24, Installation of Private Fire Service Mains and Their Appurtenances,
and UFC 3-230-10A, Design: Water Supply, Water Distribution.
Control valves must be provided in each source of water supply, such as tanks
and pumps. Control valves must be either post-indicating or outside-stem-and-
yoke types. A sufficient number of sectional valves must be provided so that not
more than a combined total of five hydrants and sprinkler systems, or not more
than three sprinkler systems must be out of service due to a single break.
Sectional valves may be key-operated type. New valves must open by counter-
clockwise rotation of the stem.
Drawings must be provided showing control and sectional valve locations and
valve sizes. Existing left-hand valves must be clearly indicated on drawings.
Fire hydrants must be UL listed, FM approved, or listed or classified by an NRTL
and must have two 65 mm (2-1/2-inch) hose outlets and one 115m (4-1/2-inch)
suction connection with national standard fire hose threads in accordance with
NFPA 24 and NFPA 1963, Fire Hose Connections. Wet-barrel or California-type
hydrants are preferable in areas where there is no danger of freezing. Dry barrel
or traffic-type hydrants must be used in areas where there is a danger of
freezing. Hydrants must be aboveground type. If local municipal departments
use nonstandard connections, adapters must be made and supplied to engine