TM 5-811-7
(6) Find the number of anodes (n) required from equation C-3:
I
n'
,
(eq C-3)
i
where I =
858 milliamperes and i = 26.7 milliamperes. Thus,
858
n'
26.7
n = 32.1 (use 32 anodes).
(7) Find the anode distribution.
(a) Pipe area protected by one anode:
A = 4288/32
A = l34 sq ft/anode.
(b) Find the anode division (table C-6).
Table C-6. Dimensions for finding anode division
Anode
Pipe size
Pipe area
Pipe length
Number of
spacing
(in.)
(sq ft)
(ft)
anodes
(ft)
3
550
600
4
150
2
933
1500
7
214
1
895
1800
7
257
1
826
2400
6
400
1084
2900
8
488
Total number of anodes
32
U.S. Air Force.
C-8
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