MIL-HDBK-1004/10
= %&&
%&&&&&&&&&
x 3.1416 x 28 x
A
2
14 + 28
B
A
= 3,894 ft
B
(4)
Therefore:
A
= 1,759 ft
T
A
= 1,935 ft
C
A
= 3,894 ft
B
(5)
Total = 7,588 ft (wetted area of tank bowl).
b)
Area of riser pipe:
= 2Br
h
A
R
R
R
where
r
= 2.5 feet (radius of riser)
R
h
= 115 feet (height of riser)
R
A
= 2 x 3.1416 x 2.5 feet x 115 feet
R
A
= 1,806 ft
R
c)
Maximum design current for tank:
I
= 2.0 mA/ft x 7,588 ft
T
I
= 15,176 mA or 15.2 A
T
d)
Maximum design current for riser:
I
=
Rx 1,806 ft
2.0 mA/ft
I
=
R 3.6 A
3,612 mA or
e)
Minimum weight of tank anode material:
W
= YSI/E
where
W
= weight of anode material
Y
=
design life
S
=
anode deterioration rate
I
=
maximum design current
E
=
anode efficiency
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