The document discusses heat recovery steam generators (HRSG) and their linings. It provides information on HRSG capacities from various manufacturers. It also describes the original and new lining designs for an HRSG plant in Cantarel, Campeche, with the new design utilizing back-up and working lining layers. Finally, it mentions that the next step is to change the current combustion chamber lining to a Pyrobloc HS M module design and provides specifications for HRSG silencer panels.