horizontal return tubular boiler

horizontal return tubular boiler

[‚här·ə′zänt·əl ri′tərn ¦tü·byə·lər ′bȯil·ər]
(mechanical engineering)
A fire-tube boiler having tubes within a cylindrical shell that are attached to the end closures; products of combustion are transported under the lower half of the shell and back through the tubes.