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The electro-osmotic pulse (EOP) systems are widely used for damp-proofing the basements of buildings. However, the cathode of EOP systems will produce stray current interference, posing risks of electrochemical corrosion to the buried steel pipe. This paper introduces a series of on-site tests and numerical simulations conducted in a townhouse alley equipped with EOP systems. The corrosion risk produced by EOP was evaluated and corrosion mitigation measurements were discussed. The results show that the EOP system produces 1 Hz pulse dynamic direct current in the soil, resulting in the average ground potential of gas pipes and the building steel pipe will rise from -0.7 to +1-4V. The shorter the distance, the stronger the interference. Metal shielding nets and sacrificial anode were simulated and proposed to mitigate pipe corrosion. The findings of this study can serve as a reference for the safe use of EOP systems and gas pipe anti-corrosion protection.

Corrosion of steel gas pipe under stray current from electro-osmotic pulse water-proof system