MIL-HDBK-1004/10
9.2.1
Design Data
a)
Tank capacity - 500,000 gallons
b)
Tank height (from ground to bottom of bowl) - 115 feet
c)
Diameter of tank - 56 feet
d)
High water level in tank - 35 feet
e)
Overall depth of tank - 39 feet
f)
Vertical shell height - 11 feet
g)
Riser pipe diameter - 5 feet
h)
Shape of tank - Ellipsoidal, both top and bottom
i)
All internal surfaces are uncoated
j)
Design for maximum current density - 2 mA/ft
k)
Electric power available 120/240 V ac, single-phase
l)
String-type HSCBCI anodes are used
m)
Design life - 10 years
n)
Water resistivity - 4,000 ohm-cm
o)
Tank water must not be subject to freezing
p)
Assumed deterioration rate - 1.0 lbs/A yr
q)
Anode efficiency (assumed) - 50 percent
9.2.2
a)
Area of wetted surface of tank bowl (see Figure 97):
(1)
Top section (T):
= 2 B rx (approximate)
A
T
where
r = 28 feet (radius of tank)
x = 10 feet
A
= 2 x 3.1416 x 28 x 10 ft
T = 1759 ft
A
T
156
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