Abstract: A centrifical slurry pump impeller comprises auxilliary vanes located on at least one side surface thereof, an annular projection joining the auxilliary vanes at or adjacent the periphery of the impeller, and at least one further projection extending between adjacent auxilliary vanes and spaced substantially from both ends of the adjacent auxilliary vanes to form pockets intermediate the adjacent auxilliary vanes with the annular projection, thereby to limit recirculation of the working fluid of the pump along the face of the impeller containing the auxilliary vanes.

Abstract: In a centrifugal pump, an enclosed-type impeller is provided with a plurality of auxiliary side vanes on either or both of the front and back faces of the impeller which project toward and conform with suitable running clearances to the walls of the casing adjacent the impeller. Annular members projecting axially from the sides of the impeller about the periphery thereof serve to limit circulation of working fluid into the spaces along the sides of the impeller. In one embodiment, the annular projection defines radially oriented passages or channels for transmitting fluid which is driven by the centrifugal action of the side vanes.

Abstract: A pump comprising an outer casing, an inner liner and a rotatable impeller, the liner being mounted to the casing in a manner such that the liner is substantially secured against rotational movement within the casing but can expand, contract or deflect radially from the centerline of rotation of the impeller.

Abstract: The invention relates to a mobile drilling rig providing a rotation head which is small enough to fit between the mast members of the rig. Arrangements are made to pivot back the rotation head to give access to the drill line of the rig. The mast members can be pivotted on a frame to place them into the drilling and travelling position respectively.

Abstract: The invention relates to a mobile drilling rig providing a rotation head which is small enough to fit between the mast members of the rig. Arrangements are made to pivot back the rotation head to give access to the drill line of the rig. The mast members can be pivotted on a frame to place them into the drilling and travelling position respectively.

Abstract: A centrifugal pump casing of the volute type having a volute region comprising two circular segments of differing radii adjoining tangentially and a discharge branch leading tangentially away from the segment of greater radius. Liners for the casing are formed in the same manner. Preferably the adjoining circular segments are of common constant cross section.

Abstract: Bismuth trichloride is produced by reacting a molten bath of metallic bismuth and bismuth trichloride at a temperature below the boiling point of the trichloride with dry gaseous chlorine.

Abstract: A pump casing for high pressure pumps is composed of two halves each half being provided with a liner. The two casing halves are joined by flanges which are recessed to receive corresponding flanges of the liners. At least one groove is provided in the recess formed by the casing flanges to receive and retain part of the liner flange material.

Abstract: A mechanical seal assembly for a rotating shaft passing into a pressure vessel and being axially adjustable is formed by a first seal face rotating with the shaft and engaging a fixed seal face. This latter face is supported in a housing which is axially adjusted with the shaft. The housing in turn passes through an opening in the pressure vessel and is permanently sealed therein by an O-ring seal.