Background A refinery located east of Venezuela has an FCC unit with a capacity of 15,000 bbl/day. This unit has an H 2 S stripping tower to stabilize the FCC naphtha. Every three months, the failure of the FCC naphtha reboiler in the naphtha side housing rich in H 2 S caused unplanned plant stops. ChemTreat and the refinery established a work plan to determine the corrosion mechanism and correct the issue. The Facts • High levels of H 2

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