Flue Boilers - Galloway Boiler Horizontal Two-Flue Internally-Fired Galloway Tubes

FLUE BOILERS - GALLOWAY BOILER: HORIZONTAL, TWO-FLUE, INTERNALLY-FIRED, GALLOWAY TUBES Another boiler of the same general form is the Galloway, shown in Fig. 7. This boiler differs from the Lancashire in that short tubes are added to the flues. In the Galloway boiler having two distinct flues, the tubes were placed as shown in Fig. 8.

In the later form of Galloway boiler, the two flues merge into one large flue of the shape shown in Fig. 9. This flue has corrugated sides and the conical tubes are staggered, thus insuring a thorough breaking up of the currents of hot gases. The tubes are made conical to facilitate removal for repairs. The shape of the tube also permits the water to expand on being heated, and the particles rise vertically without disturbing the water on the heating surfaces above. The conical tubes are generally riveted rather than welded because the removal of a tube that is welded leaves a large hole in the flue.