A JET TYPE HIGH VELOCITY SLIT EROSION TEST APPARATUS FOR COMPARATIVE GRADING EVALUATION OF SILT EROSION RESISTANCE OF DIFFERENT MATERIALS AND COATINGS OF THE TURBINE COMPONENTS UNDER CLOSELY SIMULATED FIELD CONDITIONS PREVAILING IN HYDRO PLANT

摘要

The invention relates to a jet type high velocity slit erosion test apparatus for comparative grading evaluation of silt erosion resistance of different materials and coatings of the turbine components under closely simulated field conditions prevailing in hydro plant, comprising: a shurry tank (2) having agitator means (2a,2b); a jet type slurry pump (1) for transfer of slit-containing water drawn from the slurry tank (2) under high pressure; a plurality of hardened steel nozzsles (3) operably connected to the pump (1); and an erosion test chamber (4) having at least one orientable sample mounting means (4a); wherein the slurry tank produces a water- slit mixture consisting of a known-concentration of erodent particles which is impinged on a test-sample held on the sample holder for a predetermined period of time, and wherein the means for jet type impingement of the slurry, a change in particle velocity, a change in slit concentration, and change in impringement angle allows to produce a realistic and accurate results of erosion including grading of erosion of different coated components of the turbine.