Abstract: A weldable abrasion resistant ceramic brick is formed with spaced recesses extending angularly into the brick to undercut a surface thereof and interlock with a weldable insert having angularly extending projections mating with and insertable into the recesses. Each recess may be defined by a wall inclined into the undercut for camming an aligned projection into the undercut. The insert and brick may be interlocked and thereafter welded to a substrate, or the insert may first be welded to the substrate and thereafter interlocked with the brick. The invention is particularly useful with comparatively thin abrasion resistant wear plates that heretofore could not be welded satisfactorily to a substrate.

Abstract: A pipe elbow having a composite ceramic wear liner which is particularly adapted to resist abrasive wear from particulate material conveyed through the pipe elbow. The composite ceramic wear liner is comprised of four series of polyhedron shaped ceramic wear blocks disposed at angularly spaced locations around the circumference of the elbow flow passageway. A mixture of wear resistant particles and binder surrounds the wear bricks and provides an abrasion resistant wear surface along those portions of the pipe elbow which are less subject to abrasive wear. The pipe elbow is provided with a removable cover plate in order to access and replace the series of wear bricks located along the outside center line of the pipe elbow most subject to wear.

Abstract: A tell-tale wear monitor for pipes having wear resistant inner linings. A plurality of wear monitors is provided spaced apart along the length of a pipe section or spool and angularly spaced apart about the pipe circumference. Each of the wear monitors includes a plug member attached to the outer pipe casing and covering a tell-tale hole which extends through the pipe casing. The plug members are made of a material which, relative to the inner lining material, is readily worn away by abrasive contact with the material conveyed within the pipe. When the plug member is worn through, fluid flow is permitted through the tell-tale hole. The wear monitor provides a means for determining when maintenance of the pipe section should be scheduled and allows for extended useful life of the pipe section.