This paper intended to analyses the effect of geometrical tolerances of Archimedean screw pump on its theoretical performances. Generally, Archimedean screw pump consists of row of helical blades that surround a central cylindrical hollow tube and installed inside semi-circular, or even closed circular cross section trough. The screw helical blades, central cylindrical tube and trough are commonly manufactured using steel, typical S275JR steel. Deviation in actual steel geometrical dimension during fabrication is unavoidable. In practice, deviation in geometrical tolerance for steel fabrication are ensure to comply allowable tolerance stated in DIN ISO 2768. However, as the performance of Archimedean screw pump are affected by its geometrical factor, the effect of the latter allowable tolerance on the theoretical performances of the pump should be investigated. Theoretical performance of various sizes of Archimedean screw pump, where its outside diameter ranging from 400mm to 3000mm are investigated. The result of this investigation will be essential in developing acceptance criteria for Archimedean screw pump during factory acceptance test (FAT).
