MIL-HDBK-1005/7A
4.2.4
Connecting Structures. Types and construction of
connecting structures should be selected to meet local
requirements insofar as they do not conflict with Military
criteria.
4.2.4.1
a) Direct Connection to Pipeline. Use tapping sleeve
valves when the flow cannot be interrupted during construction.
Otherwise, cut in a tee. Include a valve and, where required, a
reduced pressure backflow preventer between the municipal system
and the Military system.
b)
Intake from Reservoir.
Use existing intakes where
feasible.
4.2.4.2
Appurtenances
a) Meters. Locate meters away from normal traffic
but accessible, and protect them against unauthorized intrusion.
Meter types are as follows:
(1)
propeller type
(2)
Venturi tube
(3)
ultrasonic flowmeter
(4)
Dall meter.
b) Backflow Preventers. Provide these safeguards at
all points where a nonpotable water system must be connected to
a potable system. Refer to AWWA M14, Recommended Practice for
Backflow Prevention and Cross-Connection Control, local plumbing
code, and AF 132-1066 for Air Force projects.
c) Review manufacturer's literature to insure proper
installation conditions.
4.3
Groundwater. Refer to AWWA Manual M21, Groundwater,
and Groundwater and Wells by Fletcher G. Driscoll, Johnson
Division, St. Paul Minnesota for detailed information relating
to types of groundwater wells, quantitative evaluation of
groundwater wells, groundwater quality and contamination.
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