Patent ID: 6901887
Filing Date: 2005-06-07
Classification: F22B,Y02P

Abstract:
1. A package, two-drum, water tube boiler comprising: (a) a first side wall, a second side wall, and two end walls disposed in a rectangular configuration, the side walls being substantially longer than the end walls; (b) a cylindrical, lower, water drum adjacent to, and having its longitudinal axis parallel to, the bottom of the first side wall; (c) a cylindrical upper, steam drum adjacent to, and having its longitudinal axis parallel to, the top of the second side wall; (d) a combustion chamber located generally between the drums, for containing a flame extending parallel to the axes of the drums; (e) riser tubes connecting the lower drum to the upper drum so as to permit water, saturated steam, and mixtures thereof to flow from the lower drum to the upper drum, which riser tubes comprise (f) wherein the inboard radiant tubes in their generally horizontal run extend past said vertical plane by a distance equal to at least 60% of the radius of the upper drum and then bend upward and away from the second side wall before entering the upper drum.