FIELD: machine building.
SUBSTANCE: invention relates to a method of making a tubular device, in which a first pipe is connected to a second pipe, wherein both the first pipe and the second pipe are metal tubes. Invention also relates to a tubular device comprising a first metal pipe provided with a first external thread in its end area, a second metal pipe provided with a second external thread in its end area, a first butt joint connecting said end areas of the first and second pipes, and a sleeve provided outside the first and second metal pipes, forming a threaded joint with the external thread of the first and second pipes. Invention also relates to furnace, which contains chamber, which is equipped with burner device for heat generation.
EFFECT: said chamber is equipped with a tubular device, as further defined for conducting hot gas or steam through the furnace.
14 cl, 4 dwg
