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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