Sand erosion of Pelton turbine nozzles and buckets: A case study of Chilime Hydropower Plant

Bajracharya, Tri Ratna; Acharya, Bibek; Joshi, C. B.; Saini, R.P.; Dahlhaug, Ole Gunnar

doi:10.1016/j.wear.2007.02.021

Cited by 105 publications

(73 citation statements)

References 1 publication

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“…The values of exponent "b" are determined as 0.414, 0.295 and 0.316, respectively, for mild steel, SS202, and SS304 for Equation (1). The values of exponent "b" show good agreement with researchers [2,15,19]. The value of exponent "a" is much higher as compared to exponent "b".…”

Section: Effect Of Weighted Mean Diameter On Average Erosion Wearsupporting

confidence: 79%

Erosion Wear Investigation of HVOF Sprayed WC-10Co4Cr Coating on Slurry Pipeline Materials

Kumar

Singh

et al. 2017

Coatings

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Abstract:In the present work, erosion wear due to slurry mixture flow has been investigated using a slurry erosion pot tester. Erosion tests are conducted on three different slurry pipe materials, namely, mild steel, SS202, and SS304, to establish the influence of rotational speed, concentration, and time period. In order to increase erosion wear resistance, a high-velocity oxy-fuel (HVOF) coating technique is used to deposit a WC-10 Co 4 Cr coating on the surface of all piping materials. Experimental results show that rotational speed is a highly-influencing parameter for the erosion wear rate as compared to solid concentration, time duration, and weighted mean diameter. WC-10 Co 4 Cr HVOF coating improved the erosion resistance of piping materials up to 3.5 times. From experimental data, the exponents of solid concentration, velocity, and the size of particles are calculated for the empirical erosion wear equation. A functional equation of the erosion wear rate is developed. The predicted erosion wear is in agreement with the experimental data and found to be within a deviation of ±12%.

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Section: Effect Of Weighted Mean Diameter On Average Erosion Wearsupporting

confidence: 79%

Erosion Wear Investigation of HVOF Sprayed WC-10Co4Cr Coating on Slurry Pipeline Materials

Kumar

Singh

et al. 2017

Coatings

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“…In the nozzle, a strong turbulent effect occurs on the needle surface due to very high velocity at the nozzle outlet and the needle surface. In Chilime Hydropower Plant (2 × 11 MW, gross head: 350 m), average erosion in the needle tip during the maintenance was found to be around 0.3 mm [15]. In this region, the average quartz particle in the sand is more than 75%.…”

Section: Erosion In Pelton Turbinesmentioning

confidence: 95%

“…One explanation is the micro-roughness in the surface [16], (c) Khimti HPP [9], (d) Chilime HPP [15].…”

Section: Erosion Of the Nozzle Systemmentioning

confidence: 99%

A Review on Sediment Erosion Challenges in Hydraulic Turbines

Chitrakar¹,

Neopane²,

Dahlhaug³

2018

Sedimentation Engineering

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Sediment constitutes several mineral compositions depending upon the geological formation and geography. In many of the rivers in Himalayas and Andes, Quartz is found as a main constituent (more than 50%), along with feldspar and other hard minerals. These particles have hardness more than 5 Moh's scale, which is capable to erode turbine components. In hydraulic turbines, flow is highly turbulent and unsteady, which can aggravate the erosion problems. Depending upon the nature of the flow, different components of turbines are eroded with different mechanisms. This chapter will provide a review on how various flow phenomena is responsible for particular types of erosion in turbines and their potential consequences. Some examples of the effect in existing power plants will be shown.This chapter will also discuss about some preventive measures that have been proposed and implemented to reduce the impact of the sediment particles in hydraulic machineries.

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“…Because of sediment disintegration stream design changes, loss in effectiveness and vibration delivered, lastly breakdown of hydro turbine happen. Various research have been attempted to foresee the conduct and to decrease the impact of disintegration in hydro turbines, because of sediment [13][14][15][16][17][18][19][20].…”

Section: Small Hydro Powermentioning

confidence: 99%

Correlation Development for Erosive Wear Rate on Pelton Turbine Buckets

Thakur¹

2017

IJMPERD

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Sand erosion of Pelton turbine nozzles and buckets: A case study of Chilime Hydropower Plant

Cited by 105 publications

References 1 publication

Erosion Wear Investigation of HVOF Sprayed WC-10Co4Cr Coating on Slurry Pipeline Materials

Erosion Wear Investigation of HVOF Sprayed WC-10Co4Cr Coating on Slurry Pipeline Materials

A Review on Sediment Erosion Challenges in Hydraulic Turbines

Correlation Development for Erosive Wear Rate on Pelton Turbine Buckets

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