Recommended Practice to Mitigate negative interaction between grounding and cathodic Protection

Basic purpose behind Cathodic protection of underground facilities is to safeguard them against corrosion due to formation of galvanic cell between two parts of same facility. Choice between two kinds of cathodic protection either Sacrificial anode or Impressed current is based primarily upon soil resistivity. Efficacy of Impressed current technology heavily depends upon measures undertaken during grounding of underground facilities which if not taken care would undermine enormous effort and investment in Cathodic protection of such facilities. In this paper, interaction between Cathodic protection and grounding system is revisited and suggested practices are highlighted which can help to make both systems efficient.