Conduit for a combustion product exhaust circuit and for supplying combustive air to a steam-fitting facility

摘要

The pipe (1) has a peripheral tube (14) in which a central tube (10) and an intermediate tube (12) are housed. The peripheral tube includes upper and lower ends (14c, 14d) arranged at distance from upper and lower ends (10c, 10d) of the central tube for defining upper and lower annular through holes (15a, 15b) of a peripheral chamber (15). Upper and lower through holes of an intermediate chamber (13) are extended through cylindrical tube sections (13c, 13d) that traverse the peripheral chamber and externally emerge through the peripheral tube.