MIL-HDBK-1005/7A
c)
Appurtenances.
Include the following
appurtenances:
(1)
Outside tank ladder.
(2)
Roof hatch with lock.
(3)
Screened vent.
(4)
Flanged access hole near the ground.
(5)
Water level indicator and alarm.
(6)
Sampling access points.
d)
Structural Design. For criteria on structural
design of reinforced concrete and prestressed concrete, refer to
NAVFAC DM -2.04, Concrete Structures. Steel tanks should meet
AWWA Standard D100. Wire and Strand-Wound, Circular,
Prestressed Concrete Water Tanks should meet AWWA Standard D110.
Circular Prestressed Concrete Water Tanks With Circumferential
Tendons should meet AWWA Standard D115.
e)
Dual Tanks. When storage for a station or area
is provided by ground storage only, consideration should be
given to the provision of two tanks to maintain partial capacity
during repairs or cleaning of one tank.
8.3.2.2
Underground Storage Tanks . Requirements for the
design of underground storage tanks are given below:
a)
Piping Arrangements.
Follow the criteria given
for ground storage tanks.
b)
Depth.
Design for a minimum depth of 8 ft
c)
Insulation. Cover the waterproofed roof with a
minimum of 2 to 3 ft of earth, planted with grass, graded, and
drained to prevent ponding of surface water.
d)
Compartments. Divide large tanks into several
compartments, to minimize the loss of storage capacity during
repair of any one section.
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