Abstract: A flue gas air preheater and a method for the installation of air pipes for a flue gas air preheater. The method includes cutting an air pipe connected to the preheater and detaching the portion of the air pipe that is to be removed from the preheater for replacement; fitting a separate new air pipe in place of the air pipe portion to be removed; and connecting the new air pipe to the remaining portion of the air pipe in a sealed manner. The fixing may be performed utilizing a fastening sleeve fixed to the end of the new air pipe and inserting it in the remaining portion of the air pipe. The fixing may be performed by a mechanical sealing solution without welding. The air pipe component for the flue gas air preheater includes an air pipe, and a fastening sleeve.