Cast Iron Waterbox Rebuild PROBLEM Case Studies In 1985, the Cast Iron Waterboxes at the San Juan Station of Puerto Rico Electric Authority, after being subjected to many years of salt water attack, were corroded to the failure point and were leaking in numerous areas. Replacement of the old waterboxes, if even possible, would take about 2-3 years, but the power generation was needed immediately. SOLUTION DUROMAR, INC. was contracted to rebuild/reprofile the surface with our thick film, permeation and abrasion resistant epoxy lining, SAR. After completely removing the thick crust of scale and digging out the graphitized pits, the surface was steamed to remove chlorides, dried and sandblasted to white metal. The rough surface was reprofiled with SAR which in some areas required over 1'' of

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