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 MIL-HDBK-1008B
capacity with reliable power and water supply. This equipment shall conform
to requirements of NFPA 20, Installation of Centrifugal Fire Pumps. Fire
pumps, drivers and other equipment including automatic accessories shall be
listed by UL or approved by FM or listed or classified by a NRTL.
5.6.2
Pump Type. A fire pump may be either a horizontal or vertical shaft
centrifugal pump or a vertical shaft turbine pump, whichever is most
economical and appropriate for the intended use. A horizontal centrifugal
pump in either the horizontal or vertical position shall not be used where
suction lift is required. A vertical shaft turbine pump shall be used for
suction lift.
5.6.3
Pump Starting Arrangement. Fire pumps shall be arranged to start
automatically except that they shall be arranged for manual starting when
other available water supply sources are capable of providing demands for
automatic sprinkler systems simultaneously with domestic and industrial
demands.
5.6.4
Pump Drive. When electric power is economically available from a
reliable single power source or from two independent sources in accordance
with NFPA 20, pumps shall be electric driven only. A reliable single power
source is defined as a power source having an average forced down time,
excluding scheduled repairs, which does not exceed 8 consecutive hours for any
one incident nor more than 24 hours cumulatively over the last 3 years. When
such electrical power supplies are not available, fire pumps shall be diesel
driven. Spark ignited internal combustion engines shall not be used to drive
fire pumps.
5.6.5
Water Level Controls. Manual controls, double-acting altitude
valves, or other automatic devices shall be used to maintain the water level
in elevated storage tanks. Altitude valves shall be arranged with bypasses.
5.6.6
Meters. Where meters are installed on water distribution systems,
they shall be listed by a NRTL as fire flow meters.
5.7
Water Distribution Systems
5.7.1
Mains. The distribution system shall be sized to accommodate fire
flows plus domestic and industrial or flushing demands that cannot be
restricted during fires. Distribution shall be looped to provide at least 50
percent of the required fire flow in case of a single break. Dead-end mains
shall be avoided. Distribution systems shall be designed in accordance with
NFPA 24, Installation of Private Fire Service Mains and Their Appurtenances.
For Army and Air Force projects, also refer to TM 5-813-5/AFM 88-10, TITLE,
Vol. 5. For Navy projects, also refer to MIL-HDBK-1005/7, Water Supply
Systems.
5.7.2
Valves. Control valves shall be provided in each source of water
supply, such as tanks and pumps. A sufficient number of sectional valves
50
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