ESAB Linde FSJ-5 Jet-Channeling Blowpipe is designed to cut slots or channels in various rock formations, particularly as required in the quarrying of dimensional stone. It creates tremendous heat (3500-degrees F) by igniting oxygen and kerosene in a fine mist mixture within a water cooled combustion chamber. The hot gases generated pass through a divergent nozzle, increasing the gas velocity to 5000 feet per second.