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 (SLBMCE
) using Equation14-7.
Equation 14-7.
The following table shows gage thickness and available structural plate 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 |