MIL-HDBK-1004/10
where
W
=
weight of
anodes required
Y
=
15 years
S
=
8.8 lbs/A
yr
I
=
8.3 A
E
=
60% anode
efficiency (see Figure 73)
W
=
(15 x 8.8
x 8.3)/60%
W
=
1826
As shown below, the system can be limited either by anode output or anode
weight. Sixty-six anodes each weighing 32 pounds have a total weigh of 2,080
pounds and will thus provide the desired anode life. Fifty 32-pound anodes
weigh 1,600 pounds, thus the system will be limited by the weight of the
anodes for the desired system life.
Steel Sheet Piling in Seawater (Impressed Current). The same
9.11
installation as described in para. 9.10 is to be protected using an impressed
current system.
Structure and environment are identical to those in
9.11.1
Design Data.
para. 9.10.
a)
Sled-mounted HSCBCI anodes are to be used for the front side of
the bulkhead.
b)
Vertical HSCBCI anodes are to be used on the shore side of the
bulkhead.
c) Separate rectifiers are to be used for the front and shore
sides of the piers. Electric power 120/240 V ac is available at locations
along bulkhead.
d)
Anode bed resistances must not exceed 2 ohms.
9.11.2
a)
Anode sled design (seawater side):
Select 2- by 60-foot anode as shown in Figure 89.
Since the anode will be immersed in water, the formula for a vertical anode
can be used:
R = (P/L)/K
203
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