Radiant tubes for heat system, include w type radiant tubes and u type radiant tubes. the pipe is make by centrifugal casting.
W Type Radiant Tubes
A radiant tube heating system comprising an outer radiant tube made of heat-resistant material, a burner assembly comprising an inner tube locted within and spaced inwardly from said radiant tube, said inner tube having a forward discharge end, means for delivering combustion air into said inner tube for flow toward the forward end of said inner tube, a gas supply pipe located within said inner tube and having a forward end, means for delivering gaseous fuel to said gas supply pipe for flow toward the forward end of said gas supply pipe, a tubular nozzle on the forward end portion of said gas supply pipe and adapted to receive fuel from said supply pipe, said nozzle being at least partially disposed within said inner tube and coacting therewith to define an annular passage permitting combustion air to flow out of the forward end of said inner tube, openings in said nozzle and permitting a portion of the combustion air in said inner tube to flow into said nozzle and mix with the fuel therein, means adjacent said nozzle for igniting the fuel-air mixture discharged from said nozzle and thereby produce a flame, and means mounting said nozzle for selective back and forth adjustment relative to the forward end of said tube thereby to enable said flame to be shortened and lengthened.