MIL-HDBK-1004/10
9.6.1
Design Data
a)
Tank capacity, 1,000 gallons.
b)
Tank dimensions, 46 inches in diameter by 12 feet long.
c)
Tank is mounted horizontally.
d)
Water resistivity is 8,600 ohm-cm with a pH value of 8.7.
e) Tank interior surface is bare and water temperature is
maintained at 180 degrees F (82.2 degrees C).
f)
Design for maximum current density of 5 mA/ft.
g)
Design life, 5 years.
h)
Use HSCBCI anodes.
i)
Alternating current is available at 115 V ac, single phase.
9.6.2
a)
Interior area of tank:
= 2Br + BdL
A
T
where
r = 1.92 feet
d = 3.83 feet
L = 12 feet
A = 2 x 3.1416 x (1.92) + 3.1416 x 3.83 x 12
T
A
= 167.5 ft
T
b)
Maximum protective current required:
I = 167.5 x 5
I = 838 mA or 0.84 A
c)
Minimum weight of anode material for 5-year life:
W = YSI/E
where
Y
=
5 years
S
=
1.0 lbs/A yr
I
=
0.84 amp
E
=
0.50 efficiency
W
=
5 x 1.0 x 0.84 pounds/0.50
W
=
8.4 pounds
188
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