MAINTENANCEMAINTENANCE

The heat transfer units' heads, external to the flue gas path and containing the ends of the tube bundles, have propers access doors to be inspected.

So the maintenance (i.e. to exclude one tube in case of failure) can be done without entering into the convective section.

That allows to save much time, as the boiler has not to be completely cooled, scaffolding are not to be installed and previous cleaning of the heat transfer unit has not to be done.