Abstract: A process is for producing machine components from highly corrosion and water-resistant cast mineral, especially for the production of monolithically cast pump housings or parts in which the binder is first mixed with the filler in a positive mixer and the finished mixture is poured into a mould and hardened. In order to obtain a dense and non-porous casting which needs no further machining, a heat-curing synthetic resin-curing agent system is used as the binder. The binder and filler are mixed in a heatable, evacuated positive mixer at a temperature of over 20.degree. C. and a pressure of under 80 mbar. The casting take place in a preheated mould as a rising casting. The cast mineral in the mould is first cured at a temperature of over 60.degree. C. and the cured casting is removed from the mould, cleaned, measured and if necessary post machined. Finally the casting is cured in an annealing furnace at over 120.degree. C.

Abstract: A centrifugal pump is disclosed having a low final construction and mounting cost and in which the assembly may proceed with prefabricated machine parts of standard size. The centrifugal pump has an axial inlet pipe, an impeller, an impeller shaft connected to the impeller, a bearing block retaining the impeller shaft, and a stuffing box surrounding the shaft. A pump housing has the inlet pipe at one side, and a stuffing box housing at the other side. The pump housing is comprised of two similarly constructed spaced apart wall parts. Around a periphery of the wall parts a spiral housing is provided. The wall parts and spiral housing are positioned between two holding discs which connect the wall parts to the spiral housing. The two holding discs are held together by bolts and one of the holding discs is connected to a holding plate which in turn connects with the bearing block via a base.