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Minimum Cover Requirements

This chart shows the guidelines for minimum cover required for heavy off-road construction equipment.

General guidelines for minimum cover required
for heavy off-road construction equipment
Pipe Span,in. Minimum Cover (ft) for indicated Axle Loads (kips)*
18-50 50-75 75-110 110-150
12-42
48-72
78-120
126-144
2.0
3.0
3.0
3.5
2.5
3.0
3.5
4.0
3.0
3.5
4.0
4.5
3.0
4.0
4.0
4.5
* Minimum cover may vary, depending on local condition. The contractor must provide the additional cover required to avoid damage to the pipe. Minumum cover is measured from the top of the pipe to the top of the maintained construction roadway surface.
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