Effect on the Characteristics of Centrifugal Pumps

Fairbank, Leigh C.

doi:10.1061/taceat.0005469

Cited by 11 publications

(1 citation statement)

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“…Chand et al (1985) have performed extensive experiments using fly ash, sand, iron ore and coal dust at concentrations up to 26% by volume at three 1000, 1200 and 1400 rpm and have reported improvements in head and efficiency of the pump with increase in concentrations of solid as well as polymer additives. Fairbank (1942) found that the head developed by the pump for water decreases with increase in either concentration of medium particle size of sand/clay. Wiedenroth (1970) attributed the head reduction to the additional friction losses in the flow passages due to the suspension solids.…”

Section: Introductionmentioning

confidence: 98%

Performance of a Centrifugal Slurry Pump

Bajawi¹,

Salim²,

Suhibani³

2014

RJASET

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The aim of this study was to experimentally investigate the effect of speed, concentration and size of slurry on the performance of a centrifugal pump. For this purpose a facility was built where the performance of a centrifugal slurry pump was examined using aggregate slurry. Three sizes of slurry with three concentrations and at three impeller speeds were used for the performance investigations of a centrifugal slurry pump. As a reference performance the performance of centrifugal slurry pump was also tested with clean water. The performance of pump has been reported as variations of head, power and efficiency at various flow rates along with the system characteristics of the pump. The results reveal that the pump performance is grossly affected by the type of slurry, its concentration and size. Besides this the variation in speed also affects the performance as is observed in pumps with water. The maximum decrease in the head, with respect to clear water, at the operating point was found to be 47% for aggregate for size 20 mm, 15% concentration and 2600 rpm. The maximum decrement in efficiency at operating point for aggregate was found to be 47% for 4 mm size, 15% concentration and at 2200 rpm. The power increment requirement for aggregate was 9% for 4 mm size, 15% concentration and 2600 rpm.

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Section: Introductionmentioning

confidence: 98%

Performance of a Centrifugal Slurry Pump

Bajawi¹,

Salim²,

Suhibani³

2014

RJASET

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Effect of Solids on Pump Performance

Visintainer¹,

Matoušek²,

Pullum³

et al. 2023

Slurry Transport Using Centrifugal Pumps

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Conversion of operating characteristics of suction dredges from water to slurry

Kharin¹,

Kotovskii²

1971

Hydrotechnical Construction

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Published recommendations [1][2][3][8][9][10][11][12] for conversion of head, power, and efficiency characteristics of suction dredges from water to slurry are quite contradictory. Using different recommendations for converting the head of a dredge can lead to an error ranging from 10 to 15%, depending on the dredge type and the specific gravity of the slurry.To improve the formulas the authors conducted in 1966-1970 special investigations in the mechanization laboratory of the Ukranian Hydrologic and Reclamation Scientific-Research Institute (Ukr.NIIGiM) and on many operating dredges and analyzed the experimental results of other investigators from whom the necessary basic data are available. Tests were conducted with 2.5 NF, 10 Gru-8Z, 3 GM-2M, and 16 Gru-8/ dredges working in gravel-sand mixtures and in gravel, sandy, sandy-loam, and loamy soils. During the tests alloperatingparametersofthedredges were recorded automatically, which insured highly accurate measurements. Accuracy of the recorded parameters was attained by the use of highly sensitive sensors and of an ~PP-09M2 instrument which'records vacuum, pressure, readings of the discharge meter, and head loss at the intake. The transportability coefficient was used as the principal characteristic of the material in striving for a combined method of computing the hydrotransport in which this characteristic is used [5] and of computing the operating characteristics for dredges working with a slurry.The transportability coefficient is a variant of impact resistance and depends on the diameter and hydraulic particle size: +, = C$.0.z S /, ~" \ 1.5where C~ = gd/W 2 is the impact resistance coefficient; d is the particle diameter; and W is the hydraulic size.Numerical values of ~. were determined by the formulawhere ~b i is the transportability coefficient for the given size range taken from [5]; and Pi is the content of the given fraction, in %.In previously conducted studies we used the VNIINerud data for the 10 Gru-8t and 5 GR-8 suction dredges pumping sand, a sand-gravel mixture, and gravel, MISI data for a 3 GM-2 dredge pumping sands (day = 0.32 and 1.9 mm) and gravel (dav = 7.36 mm); experiments of the Hydromechanics Institute, AS Ukr. SSR, with a 1000-80 dredge working in sand; and VNIIGidromash data for a 1000-80 dredge pumping fine sand (day = 0.50 to 1.0 mm). The test data were selected with the following conditions: a) the dredge operated in a regime which excluded distort_ton of the head characteristic by cavitation; b) detailed data on the characteristics of the pumped material were available; c) the method of measuring the principal parameters of dredge operation gave sufficient accuracy.

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Effect on the Characteristics of Centrifugal Pumps

Cited by 11 publications

References 0 publications

Performance of a Centrifugal Slurry Pump

Performance of a Centrifugal Slurry Pump

Effect of Solids on Pump Performance

Conversion of operating characteristics of suction dredges from water to slurry

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