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3.2.2.1.6 Certain regions are using mechanical water and
contaminant separators and the local Regional Support
Command environmental and construction coordinators should
be consulted.
3.2.2.2 Water Main
3.2.2.2.1 Water mains include the on-site building services for
domestic and fire protection purposes from the building(s) to
the water main system stub or connection point. Interior looping
of the system for fire protection may be desirable.
3.2.2.2.2 Water main sizing for fire protection purposes will be
based upon flow and pressure requirements for on-site hydrants
and building fire suppression systems. It is recommended that
the fire protection main be no smaller than 200 mm (8 in)
diameter, and the standard hydrant lead no smaller than 150
mm (6 in) diameter. On-site water storage reservoirs and/or fire
booster pumps may be required for sites located in areas of low
system pressure.
3.2.2.2.3 Verify with local fire protection, utility and building
officials whether independent domestic and fire feeds external to
the building are required, or if a single feed can be separated
inside the building. The requirements for indicator valves will be
verified with local building and fire protection officials, or with
Government installation fire departments and public works
directorate.
3.2.2.2.4 In general, on-site fire protection and water supply
system valves, hydrant spacing, and sizing shall be in
accordance with UFC 3-600-01: "Design: Fire Protection
Engineering For Facilities". Preferred water main pipe materials
are corrosion-resistant materials such as PVC pipe, or ductile
iron pipe with corrosion protection and cathodic protection, if
required. Pipe sections and bedding shall be designed to
withstand applied loads. Crossings of critical internal roadways,
which should not be disturbed or open cut in the future, will
utilize a casing around the underlying utility pipe.
3.2.2.2.5 Fire hydrant flow tests on the supplying water utility
system should be conducted at the earliest practical date to
determine pressures available to the project site, and whether a
fire pump will be required. Many water utilities are no longer
willing to release their own internal hydrant flow data due to
liability concerns. In such cases, contracting with a local fire
protection company or consulting engineer to conduct flow tests
may be required.
UFC 4-171-05
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