Corrugated Aluminum Pipe and Aluminum Structural Plate

The service life of aluminum pipe and aluminum structural plate is a function of the pitting rate of the aluminum, which is less than 0.013 millimeter per year in the following environmental limits:
  • 4.0 ≤ pH ≤ 9.0
  • resistivity ≥ 500 ohm-cm
  • resistivity ≥ 25 ohm-cm (provided a free draining backfill material)
  • no upper resistivity limits; soft waters not a problem
Estimate interior service life (SL
BMCI
) and exterior service life (SL
BMCE
) using Equation14-7.
EquationObject340407
Equation 14-7.
The following table shows gage thickness and available structural plate thickness.
Aluminum Pipe Gage Thickness
Item 460 – CMP
Item 461 – Structural Plate
Gage
Thickness
Gage
Thickness
(in)
(mm)
(in)
(mm)
18
0.048
1.22
**
**
**
16
0.06
1.52
**
**
**
14
0.075
1.91
**
**
**
12
0.15
2.67
**
0.1
2.54
10
0.135
3.43
**
0.125
3.18
8
0.164
4.17
**
0.15
3.81
**
**
**
**
0.175
4.45
**
**
**
**
0.2
5.08
**
**
**
**
0.225
5.72
**
**
**
**
0.25
6.35