Abstract: Apparatus and method for gauging and rounding, at room temperature, a section of fully formed seamless ductile iron pipe that has an out-of-round initial cross-section profile and/or a larger than desired initial gauge. The apparatus includes a set of hour-glass shaped gauging/rounding rolls arranged so that the combined profiles of adjacent rolls forms a substantially continuous circular of precise diameter. In operation, the ductile iron pipe is passed though the opening in the set of gauging/rounding rolls, thereby causing the pipe to be gauged and rounded. The pipe is conveyed through one or two sets of rolls to accommodate multiple pipe diameters by a transport mechanism consisting of a rail mounted push car which is moved by one or more fluid actuated cylinders anchored to a base in common with the rail.

Abstract: A steel pipe element and a pipe joint for steel pipe are provided, in which the steel pipe element has a bell end including a necked-down terminal end, an annular recess portion extending axially inwardly of the necked-down portion, and being of greater interior diameter than a main cylindrical section of the pipe. A gasket retaining ring is secured in the bell end at a position extending circumferentially around the annular recess portion, and retains thereon a resilient gasket held in slight compression by the bell end of the pipe element. In the pipe joint, a spigot end of a second pipe element is inserted, in a “push-on” manner, into the bell end, whereupon the spigot end is engaged by the gasket, which itself is further compressed between the bell end and the spigot end, thereby providing a fluid-tight seal and an ability to allow for joint deflection at the joint.

Abstract: In a process for centrifugal casting metal pipe in a metal mold in which the mold is cooled by the application of cooling water to the external surface, the application of cooling water is interrupted for a time just prior to the pouring of molten metal to a time generally corresponding to the time of separation of the pipe being cast from the inner surface of the mold to thereby permit limited dilation of the mold and reduce tensile stress in the external portion of the mold.

Abstract: This invention relates to improved spectral sensitization of silver halide emulsions containing silver halide grains having metal dopants occluded therein. In one aspect, methine dyes having a primary absorption peak at less than 700 millimicrons and a cathodic halfwave potential less positive than -1.0 volt can be incorporated in silver halide emulsions containing grains having metal dopants occluded therein at high concentrations which would normally cause considerable desensitization in a conventional surface-sensitive silver bromoiodide emulsion.