shall be provided so that not more than a combined total of five hydrants and
sprinkler systems, or not more than three sprinkler systems shall be out of
service due to a single break. Control valves shall be either post-indicating
or outside-stem-and-yoke types. Sectional valves may be key-operated type.
New valves shall be right-hand valves.
Drawings. Drawings shall be provided showing control and sectional
valve locations and valve sizes. Existing left-hand valves shall be clearly
indicated on drawings.
Hydrants. Fire hydrants shall be UL listed or FM approved or listed
or classified by a NRTL and shall have two 2-1/2-inch (64 mm) hose outlets and
one 4-inch (102 mm) or 4-1/2-inch (114 mm) suction connection with national
standard fire hose threads in accordance with NFPA 24 and NFPA 1963, Screw
Threads and Gaskets for 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 shall be used in areas where there is a danger
of freezing. Hydrants shall be aboveground type. If local municipal
departments use nonstandard connections, adapters shall be made and supplied
to engine companies that respond to DOD installation fires. In DOD
installations serviced by only local fire departments, hydrant hose threads
shall be meet local requirements.
Overseas bases with current below grade hydrants in
accordance with local national policy.
The one 4-inch (102 mm) suction connection only applies to
Installation Requirements. Hydrants shall be installed adjacent to
paved areas, not closer than 3 feet (1 m) and not farther than 7 feet (2 m)
from the roadway shoulder or curb line, where they will be accessible to fire
department apparatus. Hydrants shall be installed with not less than 6-inch
(152 mm) connection to the supply main, and valved at the connection. Barrels
shall be long enough to permit at least 18-inch (457 mm) clearance between the
center of the 4-1/2-inch (114 mm) pumper connection and grade. The ground
shall be graded so that any surface drainage is away from the hydrant.
Installation shall be in accordance with NFPA 24, except as modified herein.
Pumper connection should be perpendicular to the street to allow straight
lined connection to the pumper.
A sufficient number of hydrants shall be
provided so that hose stream demand can be met without taking more than 1,250
gpm (4,700 L/min) from any single hydrant. Hydrants shall also be spaced in
accordance with the following requirements:
a) Parts of the building exterior shall be reached by hose lays of
not over 350 feet (110 m) with consideration given to accessibility and
obstructions. For new construction, at least one hydrant shall be located