Specifies the coating dependent factor that relates the internal friction angle of the soil to the friction angle at the soil-pipe interface. This option displays only if you select American Lifeline Alliance in the Soil Model Type list and Sand/Gravel as the Soil Classification.
Typical values for external pipe coatings are:
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Concrete - 1.0
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Coal Tar - 0.9
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Rough Steel - 0.8
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Smooth Steel - 0.7
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Fusion Bonded Epoxy - 0.6
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Polyethylene - 0.6