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p 133
APPENDIX 2E
CORROSION CONSIDERATIONS
Chapter 2
Helical Foundation Systems
Allowable
Allowable
Sacrificial Steel Mechanical Sacrificial Steel Mechanical
Thickness Area Capacity Thickness Area Capacity
(in)
(in
2
)
(k)
(in)
(in
2
)
(k)
Day of installation
♦
0.000 2.11
74.0
0.090 1.37
48.1
0.005 2.07
72.5
0.095 1.33
46.6
0.100 1.29
45.2
0.100 1.29
45.2
0.015 1.99
69.7
0.105 1.25
43.8
♦
0.016 1.98
69.4
0.110 1.21
42.3
0.020 1.95
68.2
0.115 1.17
40.9
0.025 1.91
66.8
0.120 1.13
39.4
0.030 1.87
65.3
0.125 1.09
38.0
0.035 1.83
63.9
0.130 1.04
36.6
♦
0.036 1.82
63.6
0.135 1.00
35.1
0.040 1.78
62.5
0.140 0.96
33.7
0.045 1.74
61.0
0.145 0.92
32.2
0.050 1.70
59.6
0.150 0.88
30.8
0.055 1.66
58.1
0.155 0.84
29.4
0.060 1.62
56.7
0.160 0.80
27.9
0.065 1.58
55.3
0.165 0.76
26.5
0.070 1.54
53.8
0.170 0.72
25.0
0.075 1.50
52.4
0.175 0.67
23.6
0.080 1.46
51.0
0.180 0.63
22.2
0.085 1.41
49.5
0.185 0.59
20.7
Scheduled 50 year corrosion loss for
plain black steel per AC358
Scheduled 50 year corrosion loss for
zinc coated steel per AC358
Figure 2E.1
HP288 steel areas and allowable mechanical
capacities for increasing sacrificial thicknesses