MIL-HDBK-1004/10
Current output for each anode type:
For A-120
I = E/R = 0.25/0.176 = 1.42 A
For A-120-1
I = E/R = 0.25/0.132 = 1.89 A
For A-120-2
I = E/R = 0.25/0.132
= 2.69 A
As the required output from each anode is 1.47 A, the A-120-1
anodes should be selected. The anodes should be installed in a manner similar
to that shown in Figure 79.
Steel H Piling in Seawater (Impressed Current). The same structure
9.13
as in para. 9.12 is to be protected using an impressed current system.
9.13.1
Design Data
a)
Seawater resistivity - 22 ohm-cm.
b) Design for 2 mA/ft between low tide level and the bottom, 1
mA/ft in the mud.
c)
HSCBCI anodes, suspended from the pier deck, will be used.
d) The structure-to-electrolyte potential for the protected
structure will be -850 mV.
e) Electrical continuity between piling and the deck reinforcement
is good and no additional bonding will be required.
9.13.2
a)
Total current requirement will be the same as in para. 9.12:
Total = 14.7 A
b) As in the previous example, one anode will be used per bent for
proper current distribution. The resistance of a single anode is:
Resistance of a single vertical anode (refer to para. 6.2.1.4)
R
=
(P/L)K
V
210
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