Page 62 - Trenchless Technology Piping Installation and Inspection
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HAB HDD PR (ft) PTMT MT (ft) (ft) 4 4 2 4 6 6 6 6 ft of cover 4 ft of cover or 3 times 8 or 3 times 3 outside diameter 8 outside diameter 12 whichever is more whichever is more 20 10 14 4 25 20 25 a Among other factors, minimum depth depends primarily on the type of soil and diamet
PJ/UT 6 ft of cover or 3 times outside diameter whichever is more
Conditions
Soil Clayey Silty Sandy Gravely Clayey Silty Sandy Gravely Clayey Silty Sandy Gravely would allow for shallower installations.
Pipe Diameters (in.) Small (<12) Medium (12~24) Large (>24) TABLE 1.7
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