Prior to the ICCP system installation, the tanks were media blasted and recoated externally and internally using Sigmacover 280 Epoxy Primer and Sigmaguard CSF 585 Epoxy. This recoating process was undertaken by a separate contractor and involved complete removal of the old coating, followed by priming and top coating to ensure long-term durability.

ACC’s scope included:

• Decommissioning and disposal of the existing anodes, Transformer Rectifier Unit (TRU), and reference electrodes.
• Design and installation of a new ICCP system, including mixed metal oxide (MMO) anodes, cabling, and a new TRU.
• Testing and commissioning of the system to ensure compliance with relevant standards.

The ICCP system was engineered to maintain protective potentials between -850mV and -1200mV across all internal surfaces. The design accounted for water resistivity, potential coating defects, and targeted a 50-year service life. The TRU was specified to deliver increasing protection current over time, accommodating changes in system demand.

The system comprises a TRU connected to a cable distribution network and 10 MMO anodes suspended from the tank roof. These anodes are strategically positioned to ensure uniform current distribution. The current flows from the anodes through the water, targeting coating defects and providing effective corrosion protection.

Anodes are terminated in stainless steel junction boxes, interconnected via hot-dipped galvanized (HDG) conduit. This conduit offers superior durability compared to plastic alternatives, being resistant to UV exposure and environmental damage, including bird interference.