Patent ID: 11460138

Abstract:
A heater of an external tubular sleeve for repairing a longitudinal section of defective hollow pipe has a frame for encompassing the sleeve when operationally positioned. Each of several burners spaced at intervals about the frame as nozzle for heating the sleeve, and a novel baffle located intermediate the nozzle and sleeve when operationally positioned, for heat dispersal over the sleeve. Each baffle has staggered vents for passing flame from the nozzle onto the sleeve, to avoid cold spots on the sleeve below the baffle, and has a central shaped deflector proximate the vents and facing the nozzle. Flame from the nozzle impacts the deflector and redirects toward the vents and periphery, of the baffle, to avoid point heating below the nozzle and provide diffused flame uniformly over the sleeve. Changing deflector and vent features can influence desired flame dispersal characteristics.