| 摘要 |
An annular ductile iron flange of nominal size has a non-threaded inner longitudinal surface defining an inner diameter that exceeds the outer diameter of a corresponding length of hubless ductile iron pipe of nominal thickness. The flange also has a basal surface with both a plurality of evenly spaced bolt holes and an annular counterbore adjacent to the inner longitudinal surface. The counterbore has a longitudinal depth slightly larger than the nominal thickness and a radial depth slightly larger than twice the nominal thickness. The flange is coupled to, and configured to rotate longitudinally around, the length of pipe. The bell end of the pipe is machined to an annular stub configured to recess into the counterbore. A threaded annular ductile-iron flange may be screwed onto the spigot end of the pipe. |
