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Find the number of 17 lb magnesium anodes and the spacing between the anode to protect a 10000 ft of a bare 4 diameter pipeline

Find the number of 17 lb magnesium anodes and the spacing between the anode to protect a 10000 ft of a bare 4" diameter pipeline in corrosive soil having a resistivity of 800 ohms-cm. Assume a current requirement of 2 mA/ft2 and an anode output of 100 mA per anode.

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