MIL-HDBK-1004/10
Current Requirements]
4.2.5
Basic Design Procedure for Sacrificial Anode Systems. For
sacrificial anode systems, the first step is the determination of the tot
current required either from actual current requirement measurements or b
multiplying a typical current requirement by the surface area of the
structure to be protected. Then the output of the sacrificial anodes to
used is determined. This is usually calculated based upon soil resistivi
Thus, soil resistivity is an important factor in the design of a cathodic
protection system. A simplified expression that can be used to estimate
output of sacrificial anodes is given below. This equation assumes that
structure to be protected is in electrolyte resistivity above 500
ohms-centimeters (ohms-cm) and that the anode-to-structure distance is 10
feet. A more accurate determination of sacrificial anode output or the
output of multiple anodes can be determined using the methods outlined in
Section 7.
Cfy
EQUATION:
i =
p
where
i
=
anode current output (mA) of a single anode
C
=
a constant equal to the following:
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