Many heaters can be revamped to suit new requirements of the plant unit they are part of, or for energy conservation objective. In most cases, the revamp may comprise the installation of an airpreheater system or addition of tube bundles in the convection section. At other times, the revamp may be more complex, involving changes in the heater itself.

Hydrocracker heater with 4 pass process and steam superheat duty in radiant section.

Same heater after elimination of steam superheat coul and increase of process capacity by expanding to 6 passes.

A stand-alone convection section addendum in transport

The convection section addendum on site