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[Eric Nguyen]

Dear sirs

Could anyone sharing about experience to solve corrosion under deposition at trim cooler of overhead main fractionator? 

Coolers lay out ( A to H) and opened every TA (3 years period) and found much deposit at B and G, H and thickness reduction to lower than minimum requirement

We are using corrosion inhibitor with 9 - 13 ppm from Chimec supplier