Abstract: An apparatus and method for inspecting the internal surfaces of a pressurized vessel, without disturbing the pressurized environment within the vessel. A specially configured apparatus is inserted through an open bore valve and emulates a chamber having like pressure with the pressurized vessel. A camera housing containing a CCTV camera is inserted through an open bore valve to enable in situ inspection the interior of a pressurized vessel without having to bleed off this pressure. The camera is inserted into the interior from a sealed connector pipe. A camera housing assembly gains entry to a predetermined depth in the vessel by a sealed reach pipe which rotates freely under pressure. A control pipe located axially inside the reach pipe controls camera tilt.

Abstract: In a material smashing machine, such as a breaking or crushing machine, a housing is provided with at least a portion of its wall lined by a stationary wearing wall against which, in use, the material to be broken or crushed is beaten, ground, or otherwise smashed. The wearing wall is formed, at least in part, by a number of replaceable wearing plates each of which has, on its face adjacent the housing wall, at least one cranked finger which penetrates through a slot in the housing wall and engages with its cranked end the outside of the housing wall to hold the wearing plate against the housing wall. The stability of this fixing can be increased by providing the facing end surfaces of adjacent wearing plates with inter-engaging means including at least one projection on one end surface fitting into a corresponding recess or recesses in the other end surface.

Abstract: A rotary hammerbreaker including a plurality of discs driven upon a rotor shaft, a plurality of rods extending through the discs parallel to the rotor shaft and radially spaced therefrom and a plurality of hammers pivotably mounted upon the rods between the discs. The hammerbreaker is provided with a protective device consisting of a plurality of shields each including a hub mounted upon one of the rods between adjacent discs. The shields are formed with a circular segmental flange fixed to the hub extending over a part of the periphery of each of the adjacent discs between which the hub is mounted to protect the disc periphery. The flange has a circumferentially extending portion which is an integral fraction of a whole circle so that a number of the shields can be fitted to a rotary hammerbreaker to provide substantially continuous protection around the periphery of the discs.

Abstract: A material smashing machine, such as a breaking or crushing machine, including a housing in which at least a portion of its wall is lined by a stationary wearing wall against which, in use, the material to be broken or crushed is beaten, ground or otherwise smashed. The wearing wall is formed by a number of replaceable wearing plates, each of which has at least one eyelet projecting outwards through an opening in the housing wall, and which is retained against the inside of the housing wall by a wedge inserted into the eyelet and bearing against the outside of the housing wall, and a releaseable, self-locking clamping piece acts upon the wedge in the direction of its insertion into the eyelet.