Vol.9, No1, 2009, str. 57-62
UDK 621.66-75

Abstract

A case study of damage of a rotary high-pressure three screw oil hydraulic pump for regulator oil in hydroelectric power plant is presented. Results of chemical composition analysis, mechanical properties, impact energy testing and hardness measurement of power and idle rotor materials are presented and discussed. Casing inner surfaces and samples of power and idle rotor materials are examined by metallographic analyses. Obtained results allowed to conclude that life of rotary screw pumps may be extended by regular cleanness inspection of filter and its replacement if necessary, control of rolling bearings condition, oil viscosity and cleanness, and proper operation of valves and automatics.

Keywords: pump failures, metallography, abrasive wear, erosion