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Table 1 Field case investigation

From: Sediment Erosion on Pelton Turbines: A Review

 

Hydropower station

Head (m)

Capacity (MW)

Erosion phenomenon

1

Chilime HPP [50]

351.5

2×11

An efficient reduction of 1.21%; Wear rate of 3.4 mm/year was estimated for the needle and the bucket

2

Ref. [15]

920

‒

The needle was seriously eroded

3

Chennai HPP [49]

365

5×4.66

The erosion was found to be 3.71% and 5% on spear and nozzle, respectively

4

Zhalia HPP [52]

690.55

4×250

The annual erosion depth of the bucket can reach 0.1 mm

5

Fieschertal HPP [54]

515

2×32

The depth of the cutout was increased by 9 mm, and the height of the splitter was reduced by 6 mm

6

Alfalfa HPP [10]

690

‒

Coating with SXHTM70 decreased the damages significantly

7

Ref. [15]

645

81

The splitter’s thickness increased to 1% of the bucket with the efficiency dropping to 1% at full load.

8

Toss HPP [8, 55]

174

2×5

The runner was seriously eroded

9

Jhimruk HPP [56]

205

12

Drop in the efficiency of 4% of the turbine unit