Heat Exchanger Channel Head Repair
Case History #002 REV.04-97
Fossil fuel power plant, U.S.A.
ARCOR™ S-16 Prime, ARCOR™ EE-91, ARCOR™ S-16
A cast iron heat exchanger channel head, exposed to salt water service, had severe metal loss on the divider plate adjacent to the tubesheet resulting in-cooling water beginning to bypass the divider plate with a resulting efficiency drop in this unit.
The channel head was removed from the heat exchanger and abrasive-blasted to remove all graphitization and corrosion. A three-step rebuilding system was installed starting with ARCOR™ S-16 White, applied by brush to 15 mils, followed with ARCOR™ EE-91 installed between two pieces of plastic clamped to the divider plate. Once the EE-91 set up sufficiently, the plastic strips were removed and then sanded to match the surrounding gasket surface. A top coat of ARCOR™ S-16 Blue was installed at 15 mils to complete this rebuilding project.
This coating system was installed in March 1991. Efficiency of the unit was restored and no additional repair has been needed.
Severe corrosion and divider plate damage.
Repair of divider plate with ARCOR EE-91.