RAPPER DEVICE

摘要

A rapper device (1) for cleaning a heat exchange surface (2) in a pressure vessel (3) by transmitting impact energy. The rapper device (1) comprises a striker (19) and an impacting device (10) for impacting the striker which has one end (26) contacting the heat exchange surface in the pressure vessel (3). The striker comprises a piston section comprising a piston rod projecting out of the pressure vessel via a passage opening (18) in line with the impacting device (10). A piston head is slideable within a piston chamber in line with the passage opening (18). The piston chamber is operatively connected to a sealing gas supply. The piston head is a separate part with an aperture (40A). The piston rod runs through the aperture (40A), e.g., in a slideable arrangement.