US 9,810,355 B2
Face-to-face positive restrained rotating pipe flange
Kenneth J. Kempf, Omaha, NE (US)
Filed by Kenneth J. Kempf, Omaha, NE (US)
Filed on Jan. 23, 2017, as Appl. No. 15/412,952.
Application 15/412,952 is a continuation in part of application No. 14/137,502, filed on Dec. 20, 2013, granted, now 9,551,446, issued on Jan. 24, 2017.
Prior Publication US 2017/0130880 A1, May 11, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. F16L 23/00 (2006.01); F16L 23/032 (2006.01)
CPC F16L 23/003 (2013.01) [F16L 23/032 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An annular ductile iron flange of nominal size, comprising an outer longitudinal surface, a non-threaded inner longitudinal surface, at least one basal surface, and a plurality of bolt holes evenly spaced around the at least one basal surface, wherein the improvement comprises:
the inner longitudinal surface defining an inner diameter exceeding an outer diameter of a centrifugally cast length of hubless ductile iron pipe of said nominal size, the pipe having a nominal thickness and a nominal casting allowance, the flange configured to rotate longitudinally around the pipe;
the at least one basal surface including a first basal surface having an annular counterbore adjacent to said inner longitudinal surface, the counterbore having a longitudinal depth equivalent to the sum of the nominal thickness and the nominal casting allowance and a radial depth equivalent to between 1.5 and 2.5 times the sum of the nominal thickness and the nominal casting allowance; and
the flange comprising a first flange segment and a second flange segment, the first flange segment and the second flange segment of semicircular shape and hingedly connected, the first flange segment and the second flange segment sharing at least one bolt hole of the plurality of bolt holes.