MIL-HDBK-1004/10
9.3.1
Design Data
a)
Tank height (from ground to bottom of bowl) - 37 feet
b)
Tank diameter - 24 feet
c)
High water level in tank - 34.5 feet
d)
Overall depth of tank - 34.5 feet
e)
Vertical shell height - 22.5 feet
f)
Riser pipe diameter - 4 feet
g)
Shape of tank - Semicircular bottom
h)
All internal surfaces are uncoated
i)
Current required for protection - Bowl-7.0 A, Riser-1.0 A
j)
Electrical power available - 120/240 V ac single phase
k)
Tank is subject to freezing
l)
Design life - 15 years
m)
Water resistivity - 4,000 ohm-cm
n)
Button type HSCBCI anodes are used for the tank
o)
Riser anodes are platinized titanium wire.
9.3.2
a)
Minimum weight of button anode material required for tank:
W = YSI/E
where
Y
=
15 years
S
=
1.0 lbs/A yr
I
=
7.0 A
E
=
0.50
W
=
(15 x 1.0 x 7.0/0/0.50
W
=
210 pounds
b) Number of tank anodes.
Button anodes weigh 55 pounds:
N = 210/55
=
3.82 (use 4 anodes)
176
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