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  • 51.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Systemsapekter på pumpning av sovringsavfall och gråberg1994In: Konferens i mineralteknik: Luleå, 8-9 februari, 1994 / [ed] Marianne Thomaeus; Eric Forssberg, MinFo , 1994, p. 91-97Conference paper (Other academic)
  • 52.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Temperaturförhållanden i dagvattensystem i kallt klimat: analys och observationer av värmeöverföring i gatumark och luftrörelser i ledningar1983Report (Other academic)
  • 53.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Transporthantering av avvattnat avloppsslam2003In: Konferens i mineralteknik: Luleå, Sweden February 4-5, 2003 / [ed] Marianne Thomaeus; Eric Forssberg, MinFo , 2003Conference paper (Other academic)
  • 54.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Unsteady motion of particles in water: dynamic modelling based on experiments with ice and silica spheres1983Report (Other academic)
  • 55.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Vattenteknik, Luleå tekniska högskola1986In: Väg- och Vattenbyggaren, ISSN 0042-2177, no 9, p. 59-61Article in journal (Other academic)
  • 56.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Addie, Graeme
    GIW Industries Inc..
    Cost-effective pumping of coarse mineral products using fine sands1997In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 94, no 3, p. 191-194Article in journal (Refereed)
    Abstract [en]

    Coarse mineral particles with sizes of up to 200 mm can be pumped energy-effectively together with sands (< 1 mm) under nearly pseudohomogeneous conditions at volumetric solids concentrations of up to 40%. Recent experimental results indicate that particles with sizes of 0.1-0.5 mm play an important role in reducing pipe wall friction. Experimental results in pipelines with diameters of up to 0.44 m have here been used in a brief demonstration of industrial applications: integrated systems for waste rock transportation together with fine-grained tailings, coarse mineral particle pumping from open-pit mines or to disposal with dry deposition and recirculation of water and fine particles. Experiments with a crushed rock product (20-38 mm) pumped at a volumetric concentration of 13% showed that the friction losses were reduced considerably by particle degradation during the circulation in the pipeline loop. Circulatory effects must therefore be carefully considered when using coarse-particle loop results in the design of industrial once-through systems

  • 57.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Addie, Graeme
    GIW Industries Inc..
    System aspects of pumping and co-disposal of waste rock and tailings2000In: Tailings and mine waste '00: proceedings of the Seventh International Conference on Tailings and Mine Waste '00, Fort Collins, Colorado, USA, 23 - 26 January 2000, Rotterdam: Balkema Publishers, A.A. / Taylor & Francis The Netherlands , 2000, p. 49-54Conference paper (Refereed)
    Abstract [en]

    Effective use of co-disposal of waste rock and tailings depends among other things of the use of a high slurry solids concentration so as to minimize segregation of the finest particles. Generalised large-scale loop-results from the GIW Hydraulic Testing Laboratory, U.S.A., have here been used to demonstrate the economical potential of pumping at high solids concentrations with centrifugal pumps thus reducing the costs for pipelines, energy and water recycling.

  • 58.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Addie, Graeme
    GIW Industries Inc..
    Pagalthivarthi, Krishnan
    Indian Institute of Technology.
    Wear and the total cost of ownership of slurry pumps2002In: 2002 ASME Joint U.S.-European Fluids Engineering Conference: FEDSM 2002, 2002, p. 205-209Conference paper (Refereed)
    Abstract [en]

    When slurry pumps are considered for procurement for a solids transport requirement, decisions have often been made on initial price rather than the total cost of ownership (TCO). Depending on the type of solids to be transported, the design (and selection) of the pumps and the way they are operated; the wear, part replacement, and downtime can be a significant portion of the overall operating cost. Wear lives are here estimated with recently developed numerical simulation procedures for pump impeller and suction liner wear together with an established wear modeling schema for shells. White iron material is considered and the resulting modeled wear does not include any uncertainty related to the inherent stochastic nature of wear.It is shown in an example how shell, impeller and suction wear life and relative costs are related to different pump size and rotary speed designs. The results form a basis to find the best compromise between pump wear, power and capital cost in an overall TCO-perspective including the users practice and maintenance strategy.

  • 59.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Addie, Graeme R.
    Whitlock, L.
    The feasibility of transporting contaminated sediments as a slurry using centrifugal pumps2005In: Remediation of contaminated sediments--2005: proceedings of the Third International Conference on Remediation of Contaminated Sediments : January 24-27, 2005, New Orleans, Louisiana / [ed] R.F. Olfenbuttel; Patricia J. White, Columbus, Ohio: Battelle Press , 2005Conference paper (Refereed)
    Abstract [en]

    Pumping a simulated sediment slurry at a low water content has been investigated at the GIW Hydraulic Testing Laboratory in a 3 inch (0.075 m) diameter loop with a centrifugal pump with an auger-like inducer. The results and earlier reported data from the Laboratory indicate that viscous sediments characterized by yield stresses in the range of about 2 to 4 psf (100 to 200 Pa) can be pumped effectively with centrifugal pumps. With yield stresses of up to 4 psf (200 Pa), the pressure requirement to overcome pipe friction for pipeline diameters of 4 and 16 inch (0.1 and 0.4 m), may be 0.35 and 0.09 psi per ft ( 8 and 2 kPa per m) of pipeline, respectively. Several pumps in series are therefore required also for moderate transportation distances. The results indicate that centrifugal pumps can be a cost-effective alternative for handling and transportation of sediments at a low water content.

  • 60.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Addie, Graeme
    V.P. Engineering, Research and Development, GIW Industries Inc., Grovetown, GA.
    Scott, Stephen
    Effect of sand-clay slurries on the performance of centrifugal pumps2000In: Canadian Journal of Chemical Engineering, ISSN 0008-4034, E-ISSN 1939-019X, Vol. 78, no 4, p. 764-769Article in journal (Refereed)
    Abstract [en]

    The addition of clay to sand slurries has been found to reduce the pipeline friction losses, thus lowering the pumping head and power consumption. Pump water heads and efficiencies are decreased by the presence of solid particles. Experimental results are presented for a centrifugal pump with an impeller diameter of 0.625 m for three narrowly graded sands with average particle sizes of 0.64, 1.27, and 2.2 mm. Reductions in head and efficiency of up to 30% were observed for sand slurries with volume concentrations of up to 35%. Head and efficiency were lowered by about one-third for sand-clay mixtures with sand to clay mass ratios between 4:1 and 6:1. Comparisons are made with design criteria and a mechanistic model approach based on a prediction of the relative motion of the solids and water in the volute region of the pump.

  • 61.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Addie, Graeme
    V.P. Engineering, Research and Development, GIW Industries Inc., Grovetown, GA.
    Visintainer, R.
    GIW Industries Inc..
    Pagalthivarthi, K.
    Indian Institute of Technology, New Delhi.
    Prediction of slurry pump component wear and cost2005In: Proceedings, WEDA XXV and Texas A& M Annual Dredging Seminar, Western Dredging Association , 2005Conference paper (Refereed)
    Abstract [en]

    Slurry pumps are used for the transportation of solids in coal, copper, iron ore, phosphate and in other mining operations. They are also used on dredges cleaning waterways, in environmental cleanup and in reclaiming land throughout the world. Slurries by their very nature are very abrasive requiring the impeller, casing and suction liner wet end component parts be replaced at regular intervals. It is not uncommon, for example, for six liners, three impellers and two casings to be consumed in one year. It is estimated that about $500 million in slurry pump wear parts are consumed every year. Numerical models now exist to predict component wear for a given set of operating conditions with a given design. The use of these models is however available to a select few and no general relations exist for the user. The writers in this paper model a selection of pump designs producing general relationships for the different pump casing, impeller and liner components for different duties. They then take these and show which offer the lowest cost of ownership for different services.

  • 62.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Addie, Graeme
    GIW Industries Inc..
    Yu, Wei-Chung
    Conversion Systems, Horsham.
    Effects of non-Newtonian mineral suspensions on the performance of centrifugal pumps1999In: Mineral Processing and Extractive Metallurgy Review, ISSN 0882-7508, E-ISSN 1547-7401, Vol. 20, no 1, p. 239-249Article in journal (Refereed)
    Abstract [en]

    Experimental results were obtained with various industrial suspensions with densities of 1100 to 1600 kg/m3 using a 0.15 by 0.1 m four-vane centrifugal slurry pump with an impeller diameter of 0.63 m operating at 650-850 rpm. The non-Newtonian behaviour for a fixated scrubber sludge and a red mud product was characterised in pipeline loops with diameters of 0.075-0.2 m. The lowering of the pump water head and efficiency at the best efficiency flow rate region was at a maximum about 10 and 20%, respectively. With the scrubber sludge, a sharp reduction in head occurred at flow rates below 40% of the best efficiency value, resulting in an unstable head curve. This result is used to demonstrate the risk of unstable operation if a Newtonian correction procedure with a high viscosity is applied giving very large reductions in efficiency and a shift of the best efficiency point to smaller flow rates

  • 63.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Addie, Greame
    GIW Industries Inc..
    Whitlock, L
    GIW Industries Inc..
    Technical-economical feasibility of using centrifugal pumps in high-density thickened tailings slurry systems2005In: Paste 2005: proceedings of the Eighth International Seminar on Paste and Thickened Tailings; 20 - 22 April 2005, Santiago, Chile ; Addendum to the seminar proceedings: Keynote and general reporter addresses / [ed] Richard Jewell, Perth, WA: Australian Centre for Geomechanics, 2005, p. 195-204Conference paper (Refereed)
    Abstract [en]

    Pumping simulated tailings slurry at a high solids content has been investigated at the GIW Hydraulic Testing Laboratory in a 0.075 m diameter loop with a centrifugal pump with an auger-like inducer. The results and earlier experiences from the Laboratory and some reported data indicate that viscous slurries characterized by shear stresses in pipeline transportation of 100 to 200 Pa can be pumped effectively with centrifugal pumps. Stresses in this range were reported in pipeline, flume and viscometer experiments with typical base metal tailings slurries at concentrations by volume of 44% in pilot-scale thickening tests. The corresponding concentration by mass,70%, gave a non-segregating mixture which could be disposed at slopes of about 4%. With this type of slurry, an overall economical comparison here indicates that centrifugal pumps are a cost-effective alternative also in high pressure applications (4 MPa) corresponding to a distance of 1000 m when pumping 300 tonnes per hour.

  • 64.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Berggren, Andreas
    Boliden Mineral AB.
    Tano, Kent
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Some aspects of slurry flows in a mill2004In: Konferens i mineralteknik / [ed] Marianne Thomaeus; Eric Forssberg, Föreningen Mineralteknisk Forskning / Swedish Mineral Processing Research Association , 2004Conference paper (Other academic)
  • 65.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Furlan, J.M.
    GIW Industries Inc..
    Visintainer, R.J.
    GIW Industries Inc..
    Centrifugal pump performance on a high-yield stress tailings slurry2014In: Paste 2014: Proceedings of the 17th International Seminar on Paste and Thickened Tailings, Vancouver, Canada, 8-12 June 2014, InfoMine Inc. , 2014, p. 525-538Conference paper (Refereed)
  • 66.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Furlan, J.M.
    GIW Industries Inc..
    Visintainer, R.J.
    GIW Industries Inc..
    Pumping a 100-600 Pa yield stress clay slurry with a centrifugal pump2013In: Paste 2013: Proceedings of the 16th International Seminar on Paste and Thickened Tailings, Belo Horizonte, Brazil, 17-20 June 2013, Australian Centre for Geomechanics, 2013, p. 531-543Conference paper (Refereed)
  • 67.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Furtenbach, Lars
    Metso Mineral.
    Berggren, Andreas
    Boliden Mineral AB.
    Utflöde från kvarnar: modellförsök2002In: Konferens i mineralteknik / [ed] Marianne Thomaeus; Eric Forssberg, Föreningen Mineralteknisk Forskning / Swedish Mineral Processing Research Association , 2002Conference paper (Other academic)
  • 68.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Jedborn, A.
    Luleå tekniska universitet.
    Hansson, K.
    Luleå tekniska universitet.
    Hydraulic hoisting: an economic alternative in the deepening of underground mines1989In: Mining engineering, ISSN 0026-5187, Vol. 41, no 8, p. 857-859Article in journal (Refereed)
    Abstract [en]

    The objective of this study was to demonstrate the feasibility of hydraulic hoisting in hypothetical examples of mine deepening. Underground grinding to a maximum particle size of about 700 μm (about 25 mesh) is considered. The pumping of ground ore products with positive displacement plunger or membrane type of pumps at working pressures of up to 15 MPa (2200 psi) is a tested technique. The chief advantage of hydraulic hoisting is that the hoisting capacity can be increased at comparatively low total cost without necessitating the sinking of new shafts. Alternative examples include deepening of the existing mechanical hoisting system, truck, or conveyor belts transport in ramps to the present level.

  • 69.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Sundqvist, A.
    Luleå tekniska universitet.
    Integrated approaches to mine waste handling with slurry pumping1995In: Sudbury '95, mining and the environment: Sudbury, Canada, May 28 to June 1, 1995 ; conference proceedings / [ed] Thomas P. Hynes, Sudbury: Laurentian University , 1995, p. 1089-1094Conference paper (Refereed)
    Abstract [en]

    The feasibility of slurry pumping for handling and disposal of mine waste is considered. The method is cost effective for waste rock with particle sizes of 100 to 200 mm. In an example taken from the literature, the investment needed for a slurry pumping waste disposal system is calculated to be less than half that required for a conveyor belt system. In an integrated system based on slurry transport of coarse and fine particles, the additional cost of transporting wet rock together with the wet fine-grained tailings is a fraction of the cost of handling the tailings alone. The system can be integrated with a flooded area for reactive waste.

  • 70.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Sundqvist, Åsa
    Luleå tekniska universitet.
    System approaches to effective mine waste handling based on slurry pumping1994In: Land reclamation and mine drainage: International conference : Annual meeting : Papers, Bureau of Mines, United States Department of the Interior , 1994, Vol. 4: Abandoned mine lands and topical issues, p. 419-Conference paper (Refereed)
  • 71.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Visintainer, R.J.
    GIW Industries Inc..
    Furlan, J.M.
    GIW Industries Inc..
    Matousek, V.
    Czech Technical University in Prague.
    Pump and pipeline performance when pumping slurries with different particle gradings2014In: 19th International Conference on Hydrotransport 2014: Golden, 24 - 26 September 2014, 2014, p. 131-143Conference paper (Refereed)
    Abstract [en]

    A pipeline slurry friction loss model consisting of three regimes was initially proposed by K.C. Wilson in Wilson and Sellgren (2001), then extended to a four components consisting of fluid, pseudo-homogeneous, heterogeneous and fully stratified regimes, Wilson et al. (2006). The weighting technique using up to four regime related components often works well for friction loss estimations based on simple input data and model parameters. This also holds for the ANSI/HI (2011) pump performance derating procedure for settling slurries. The comparisons and discussion focus on coarse particle slurries and some cases where the modelling estimations for pipeline and pump performance were not particularly accurate.--------------------------------------------------------------------------------

  • 72.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Visintainer, R.J.
    GIW Industries Inc..
    Wilson, K.C.
    Addie, Graeme R.
    Engineering and Research and Development, GIW Industries Inc.
    Simplified approach to effect of concentration on deposition limit2011Conference paper (Refereed)
  • 73.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Visintainer, Robert J.
    Department of Engineering and R and D, GIW Industries.
    Furlan, John M.
    Department of Engineering and R and D, GIW Industries.
    Centrifugal slurry pump performance deratings: A coherent approach2017In: 20th International Conference on Hydrotransport, BHR Group Limited , 2017, p. 401-414Conference paper (Refereed)
    Abstract [en]

    A basis for a coherent derating approach, which is founded on principal parameters from commonly referred to derating procedures, is discussed. A weighting technique may couple the diminishing drag influences to rheological effects for the intermediate two-component and viscous area here represented by highly concentrated mine tailings slurries. Loop test results with authentic tailings demonstrated the decreasing head derating with increased rotary speed and thus the viscous influence, a dependence which increased with particle fineness. A marked effect on the derating with yield stresses of 200-260 Pa was also found. Maximum reductions in head and efficiency were 15 and 25%, respectively, at solids concentrations by volume of up to about 50%

  • 74.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Visintainer, Robert J.
    GIW Industries Inc..
    Furlan, John M.
    GIW Industries Inc..
    Matousek, Václav
    Czech Technical University in Prague.
    Pump and pipeline performance when pumping slurries with different particle gradings2016In: Canadian Journal of Chemical Engineering, ISSN 0008-4034, E-ISSN 1939-019X, Vol. 94, no 6, p. 1025-1031Article in journal (Refereed)
    Abstract [en]

    A pipeline slurry friction loss model consisting of three regimes was initially proposed by Wilson then extended to four components consisting of fluid, pseudo-homogeneous, heterogeneous, and fully stratified regimes. The weighting technique using up to four regime-related components often works well for friction loss estimations based on simple input data and model parameters. This also holds for the Hydraulic Institute's pump performance derating procedure for settling slurries. The comparisons and discussion focus on coarse particle slurries and some cases where the modelling estimations for pipeline and pump performance were not particularly accurate

  • 75.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Väppling, Lennart
    Luleå tekniska universitet.
    Effects of highly concentrated slurries on the performance of centrifugal pumps1986In: International Symposium on Slurry Flows : Pres. at the Winter Annual Meeting of the American Society of Mechanical Engineers / [ed] M.C. Roco; W. Wiedenroth, New York: American Society of Mechanical Engineers , 1986, p. 143-148Conference paper (Refereed)
    Abstract [en]

    Clear-water head and efficiency are generally lowered by the presence of solids, the concentration having a predominant influence on efficiency. Experimental results with two mine tailings products pumped at concentrations by weight of up to 60% indicated that the drop in head was limited to about 15% and the reduction in efficiency exceeded the reduction in head if the concentration by weight exceeded 40%. A similar pattern was found with another pump and a coarser mineral, however, the reductional effects were larger. With high concentrations of the finest tailings product (maximum particle size equals 0. 1 mm), the drop in efficiency was reasonably well correlated to the pump Reynolds number and the specific speed. Although the reductional effects are less pronounced in large pumps, the exact scaling criteria are not known at present.

  • 76.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Wilson, Kenneth C.
    Effect of strongly non-Newtonian slurries on the head and efficiency of centrifugal pumps2006In: Proceedings: International Conference of Transport and Sedimentation of Solid Particles, 2006Conference paper (Refereed)
  • 77.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Wilson, Kenneth C.
    Queen’s University, Kingston, Ontario.
    Interaction of particles and near-wall lift in slurry pipelines2003In: Journal of Hydraulic Engineering, ISSN 0733-9429, E-ISSN 1943-7900, Vol. 129, no 1, p. 73-76Article in journal (Refereed)
    Abstract [en]

    In pipeline transport of slurries, it is desirable that the solid particles should be suspended by the fluid phase. Within the body of the flow, turbulent diffusion promotes suspension, but this mechanism is not effective near the lower boundary. Under certain conditions, near-wall fluid lift can provide the necessary support for the particles. The Kutta-Zhukovski equation is used to relate the lift force to the shape of the fluid velocity profile. Comparison with experimental findings shows that this lift may be associated with profiles of solid concentration that show a decreased concentration as the bottom of the pipe is approached. Observed reductions of pressure gradients result from this "off-the-wall" lift force. In certain instances, the slurry pressure gradient is found to be less than that for the "equivalent fluid," with favorable implications for pipeline economics.

  • 78.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Wilson, Kenneth C.
    Queen's University.
    Pressure drops for pipeline transport of slurries with broad grading2006In: Proceedings of the 5th International Conference for conveying and handling of particulate solids: CHoPS-05, 2006Conference paper (Refereed)
  • 79.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Wilson, Kenneth C.
    Revised method for calculating stratification ratios for hetrogeneous flows2008In: Conference Proceedings, 14th International Conference on Transport and Sedimentation of Solid Particles: 23-25 June 2008, Saint Petersburg, Russia, 2008, p. 334-340Conference paper (Refereed)
    Abstract [en]

    With its well-instrumented pipe loops of various sizes, the GIW Hydraulic Laboratory has, over the years, developed a large corpus of slurry-transport data. Numerous technical papers have been produced, and also a textbook, now in its third edition.  A paper from 1982, together with the first and second editions of the text, presented methods of calculating stratification ratios for pipeline flows of heterogeneous slurries. This stratification ratio (R), which is needed in calculating pressure drops for particulate pipeline flows, is the fraction of total solids that contributes to mechanical friction by rubbing against the bottom of the pipe. The remaining solids are carried by the fluid phase. A combination of experimental work and analysis published in the last few years has shown the importance of the fluid force developed near the pipe wall. The influence of this force is now applied to the stratification ratio. The basic parameter is seen to be the ratio of the near-wall lift force on a particle to its submerged weight. This ratio depends primarily on a dimensionless quantity denoted Θ, and is also influenced by the lift coefficient of the particle, which, in turn, introduces a minor dependence on a particle Reynolds number Re*. It was noted that the quantity Θ is itself composed of a Froude Number for the flow (which can be related to the deposition limit) and the diameter ratio d/D. An analysis of experimental data has given a new expression for R in terms of Θ and Re*.

  • 80.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Wilson, Kenneth C.
    Queen’s University, Kingston, Ontario.
    Validation of a four-component pipeline friction loss model2007In: Hydrotransport 17: the 17th International Conference on the Hydraulic Transportation of Solids in Pipes, South African Institute of Mining and Metallurgy, 2007, p. 193-204Conference paper (Refereed)
    Abstract [en]

    Recent experiments and analyses have provided greater understanding of friction losses for the size distribution of the particles forming the slurry. Wilson & Sellgren (2001), Wilson et al. (2006) and Sellgren & Wilson (2006) have proposed a multi-component model consisting of carrier fluid and pseudo-homogeneous, heterogeneous and fully-stratified solids. The technique presented here was found to estimate friction losses well when compared to reported experimental results with pipelines with diameters mainly from 0.2 to 0.5m for various mixtures of fine sand to coarse gravel and products from mineral processing and phosphate mining.

  • 81.
    Sellgren, Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Wäppling, Lennart
    Luleå tekniska universitet.
    Choice of solids concentration in mine tailings pipelines1986In: Slurry technology - the second decade: proceedings of 11th International Conference on Slurry Technology [March 16 - 18, 1986, Hilton Head, South Carolina, U.S.A.] / [ed] B.A. Sakkestad, Washington: Slurry technology association , 1986, p. 243-249Conference paper (Refereed)
    Abstract [en]

    The majority of slurry transport applications are short-distance in-plant installations, mainly in the minerals industry. For example with most ores, after the concentration process, a fine-grained tailings slurry is transported by pipeline, sometimes as far as several kilometers, to disposal areas. Great savings of energy and water can be obtained at concentrators if the tailings slurry is thickened more effectively and water is reused directly instead of being transported the long way around the disposal area. A recent study, Sellgren (1983), shows that large amounts of heating energy can be recovered using a heat pump arrangement. The potential savings in Swedish mines was estimated to be about 10 to 20 GWh per year at every concentrator, the greatest part of which will be savings in oil.

  • 82. Sundqvist, Å.
    et al.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Large-scale pump tests with coarse waste rock2004In: Slurry Handling and Pipeline Transport - Hydrotransport 16: Proceedings of the 16th International Conference on Hydrotransport / [ed] Nigel Heywood, Cranfield, U.K: BHR Group Limited , 2004, p. 127-136Conference paper (Refereed)
  • 83.
    Sundqvist, Å.
    et al.
    Luossavaara-Kiirunavaara AB.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Large-scale testing of coarse waste rock pumping2004In: Papers presented at Hydrotransport, 16th international conference / [ed] Nigel Heywood, Cranfield, UK: BHR Group Limited , 2004, p. 127-136Conference paper (Refereed)
    Abstract [en]

    Transportation of about 0.4 Mtonnes of waste rock (-60 mm) and tailings (-4mm), with subsequent co-disposal, has been tested in a large-scale once-through pumping facility, with focus on energy efficiency, operational reliability, wear, disposal properties and environmental issues. The results showed that pumping of a mixture of tailings and waste rock may be an energy-efficient means of transportation. The pipeline friction losses (expressed in m of slurry) at solids concentrations by volume of 20 to 25% was about twice the corresponding water losses. The corresponding reduction factors in pump head and efficiency were in the range of 20 to 30%. Furthermore, the co-disposal method seems to produce a deposit with good properties in terms of stability and landscaping possibilities. The economic feasibility of a co-disposal system based on pumping will, however, be governed also by other factors, such as maintenance

  • 84.
    Sundqvist, Åsa
    et al.
    Luleå tekniska universitet.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Addie, G.
    Pipeline friction losses of coarse sand slurries: comparison with a design model1996In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 89, no 1, p. 9-18Article in journal (Refereed)
    Abstract [en]

    Friction losses in 0.2-0.3 m i.d. pipelines were investigated for three coarse sands with mass median particle sizes of 0.6-0.7 mm and size distributions of 1.4, 5.4 and 27.3, respectively, when expressed in terms of the ratio of particle diameters 85 to 15% by mass finer. The partially-stratified friction loss model proposed by K.C. Wilson, G.R. Addie and R. Clift, Slurry Transport Using Centrifugal Pumps, Elsevier, Oxford, 1992 [1] predicted the observed friction losses reasonably well at volumetric concentrations of 12-15% for velocities of practical interest. Good agreement was found for concentrations of up to 31% for sand with the intermediate distribution. However, predictions for the narrowest sand underestimated friction losses at higher concentrations of 26-31%. Friction losses for the broadest sand were overestimated markedly at concentrations of 28-39%. With these two sands, observed losses did not increase linearly with concentration, in disagreement with model assumptions. The different mechanisms involved are discussed in light of results demonstrating how particle size distribution, content of particles 0.1-0.5 mm in size, and concentration affect friction losses. The flow conditions discussed here correspond to velocities that clearly exceed those for which there are risks of deposition at the bottom of the pipe.

  • 85.
    Sundqvist, Åsa
    et al.
    Luleå tekniska universitet.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Addie, Graeme
    Slurry pipeline friction losses for coarse and high density industrial products1996In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 89, no 1, p. 19-28Article in journal (Refereed)
    Abstract [en]

    Experimental results showed energy-efficient pseudohomogeneous-like flow behaviour when a mixture of coarse (20-200 mm) granite rock in tar sand tailings ( - 1 mm) in mass proportions 1:9 was transported at a total volumetric solids concentration of 31% in a 0.44 m i.d. (D) pipeline loop. Similar results were obtained with an industrially comminuted copper ore ( - 100 mm; mass median particle size 0.75 mm) when pumped in a 0.2 m i.d. pipe at a concentration of 39%. The partially-stratified friction loss model proposed by K.C. Wilson, G.R. Addie and R. Clift, Slurry Transport Using Centrifugal Pumps, Elsevier, Oxford 1992 predicted well the observed losses of an iron ore (relative solids density 4.1, mass median particle size 0.42 mm) at a concentration of 23% (D = 0.1 m). With a slightly heavier and coarser iron ore the model tended to underestimate losses at concentrations of 14-29%. The favourable friction loss performance in some results may demonstrate how broad particle size distributions and high concentrations may cause reduced pipe wall friction without influence of true theological mechanisms. An alternative way of characterizing experimental data in terms of excess pressure gradient versus the ratio of mean velocity to hindered settling velocity is introduced. The flow conditions discussed here correspond to velocities that clearly exceed those for which there are risks of deposition at the bottom of the pipe.

  • 86.
    Tano, Kent
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Pålsson, Bertil
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    On-line lifter deflection measurements showing flow resistance effects in grinding mills2005In: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 18, no 11, p. 1077-1085Article in journal (Refereed)
    Abstract [en]

    The deflection that a lifter bar is subjected to when passing through a grinding charge was measured using an embedded strain gauge sensor. The obtained signal profile is analysed and interpreted in relation to charge properties such as toe and charge angle for the grinding charge. The current work has focused on the charge and slurry flow behaviour when solids content is changed and how well the sensor reflects this. Bench scale measurements with a vane type viscometer, roughly evaluated in terms of apparent viscosity is used as a character for the resistance to motion of the slurry. The slurry flow resistance is strongly influenced by solids content and obviously by the addition of a dispersant. The strain gauge sensor reflected this change well, showing that toe and shoulder region of the charge varied in a systematic way. Results obtained also shows that change of slurry flow resistance exert an influence on grinding performance. A multivariate statistical method, partial least squares regression, is applied to the sensor data producing a model that can predict the change in slurry flow resistance. The output from the model also shows good properties to be used as a process-monitoring tool. The predictive capability of the model is believed to be of such quality that it can be used for process control.

  • 87.
    Visintainer, Robert J.
    et al.
    Department of Engineering and R and D, GIW Industries.
    Furlan, John M.
    Department of Engineering and R and D, GIW Industries.
    McCall, G.
    Department of Engineering and R and D, GIW Industries.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Matoušek, Václav
    Czech Technical University, Prague.
    Comprehensive loop testing of a broadly graded (4-component) slurry2017In: 20th International Conference on Hydrotransport, BHR Group Limited , 2017, p. 307-323Conference paper (Refereed)
    Abstract [en]

    A 4-component model for settling slurry pipeline friction loss has been previously described by Wilson and Sellgren. The goal of the present work was to collect a comprehensive and accurate data set spanning multiple flow regimes for the purpose of validating and calibrating the model. This was accomplished by obtaining four different graded silica and crushed granite products representing the four model components. These were then combined and tested in permutations from the individual components to the complete mixture at various concentrations. Primary experiments were carried out in a 203 mm (8 inch) pipeline with selected corresponding experiments repeated in a 103 mm (4 inch) pipeline for validation of pipe size scaling. In all, 40 tests were performed with particle sizes ranging from minus 40 m to 12.5 mm, d50 particle sizes from minus 40 μm to 7.5 mm, and delivered solids concentrations from 4% to 38% by volume. Particle size distributions varied from very narrow to very broad, with d85/d50 ratios ranging from 1.3 to 30. Analysis of the data suggested the introduction of two new correlating factors which have resulted in good agreement between the comprehensive data set and the revised model.

  • 88.
    Visintainer, Robert J.
    et al.
    GIWIndustries, United States.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Furlan, John M.
    GIWIndustries, United States.
    McCall, George
    GIWIndustries, United States.
    Centrifugal pump performance deratings for a broadly graded (4-component) slurry2017In: International Conferences on Transport and Sedimentation of Solid Particles 2017, Wydawnictwo Uniwersytetu Przyrodniczego we Wroclawiu , 2017, p. 359-367Conference paper (Refereed)
    Abstract [en]

    A 4-component model for settling slurry pipeline friction loss has been previously described by Wilson and Sellgren. The goal of the present work is to adapt the concepts of this model to the calculation of centrifugal slurry pump performance deratings (i.e. pump solids effect). Tests were carried out using four different graded silica and crushed granite products representing the four model components. These were then combined and tested in permutations from the individual components to the complete mixture at various concentrations. Closed-loop run times were limited to minimize solids degradation. Primary experiments were carried out using a GIW 8×10 LSA-32 pump and selected corresponding experiments were repeated using a smaller GIW 3×4 LCC-12 pump. In all, 40 tests were performed with particle sizes ranging from minus 40 μm to 12.5 mm, dso particle sizes from minus 40 um to 7.5 mm, and delivered solids concentrations from 4% to 38% by volume. Particle size distributions varied from very narrow to very broad, with d85/d50 ratios ranging from 1.3 to 30. A new 4-component model for the pump Head Reduction Factor (solids effect on head) is proposed and compared with the existing mono-sized model described in the Centrifugal Slurry Pump Standard ANSI/HI 12.1-12.6-2016.

  • 89.
    Wennberg, Thord
    et al.
    LKAB.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Pumping evaluations with paste tailings thickened close to the surface disposal area2007In: Hydrotransport 17: the 17th International Conference on the Hydraulic Transport of Solids ; [7 - 11 May 2007, Cape Town, South Africa], South African Institute of Mining and Metallurgy, 2007, p. 561-574Conference paper (Refereed)
    Abstract [en]

    An elevated location of a paste thickener on a ridge close to the disposal area is considered at a Swedish iron ore mine. About 0.7 Mtonnes of thickened tailings are planned to be layered as paste in the vicinity of the thickener over several years with pipeline lengths of up to 900 m after about 20 years. In order to clarify the pipeline pumping characteristics of the tailings product for volumetric solids concentration from 40 to 50%, experiments in loop systems with pipeline inner diameters from 0.063 to 0.152 m have been carried out with various types of pumps. The results and comparisons carried out here showed that the performance of centrifugal pumps cannot simply be related to the rheology, but factors related to pump design and build-up tendencies of material within the pump and other particle properties may be of equal importance. During the first years of operation only one thickener underflow pump is required. The reliability and performance for various pump configurations are planned to be investigated systematically in order to meet the most effective longterm solution for paste thickener operation, pipeline distribution and placement in the disposal area as the discharge point advances over the life of the project.

  • 90.
    Wennberg, Thord
    et al.
    LKAB.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Goldkuhl, Ingemar
    MultiServ AB.
    Rheological and depositional characterisation of paste-like tailings slurries2008In: Conference in Minerals Engineering 2008, Luleå: Luleå tekniska universitet, 2008, p. 151-160Conference paper (Other academic)
    Abstract [en]

    The rheological and depositional character of tailings from two base metal concentrators are presented based on results obtained in connection with pilot-scale thickening tests and feasibility considerations. Thickening to a volumetric solids concentration of over 45% ( 70% by mass) close to the disposal area results in a non-segregating slurry that can be deposited at average slopes of 3-4%.Operating literature data from installations are briefly described and  some  macroscopic depositional mechanisms  and design features are discussed.

  • 91.
    Wennberg, Thord
    et al.
    LKAB.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Sundqvist, Åsa
    LKAB.
    Feasibility considerations of high density disposal at the LKAB Svappavaara concentrator2005In: Securing the future: international conference on mining and the environment, metals and energy recovery : proceedings, Stockholm: SweMin , 2005, p. 994-1003Conference paper (Refereed)
  • 92.
    Wennberg, Thord
    et al.
    LKAB.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Whitlock, Lee
    GIW Industries Inc..
    Predicting the performance of centrifugal pumps when handling complex slurries2008In: Proceedings of the 14th International conference on transport & sedimentation of solids particles: June 23-25, Saint Petersburg, Russia, 2008, 2008, p. 324-333Conference paper (Refereed)
    Abstract [en]

    The term complex here refers to the intermediate area between homogeneously and heterogeneously flowing slurries. Typical examples are residual products ("tailings") from the mining industry with average particle sizes of 20 to 100 microns. The performance derating are of special interest when centrifugal slurry pumps are applied to these slurries at high solids concentrations. The Hydraulic Institute's slurry (ANSI/HI 2005) and viscous Newtonian liquid (ANSI/HI 2004) standards are briefly covered with focus on applicable viscosities for non-Newtonian slurry behaviour. Various experimental results are discussed and found to give maximum deratings in head and efficiency of about 10 and 15 %, respectively, provided stable head curves can be maintained. Magnified shock losses, circulatory flows and blockage of slurry and possibly vapour tendencies in the pump entrance region may be considered as  mechanisms behind unstable head curves together with the flow behaviour of the slurry.

  • 93. Whitlock, L.
    et al.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Addie, Graeme R.
    Energy requirement for pumping sand slurries: comparison of large-scale loop and field results with a design model2004In: Proceedings of the Western Dredging Association twenty-fourth technical conference and Thirty-Sixth Texas A&M Dredging Seminar: July 6 - 9, 2004, Orlando, Florida / [ed] Robert E. Randall, College Station, Tex: Center for Dredging Studies , 2004, p. 22-35Conference paper (Refereed)
  • 94.
    Whitlock, L.
    et al.
    GIW Industries Inc..
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Wilson, K.
    Queen's University.
    Net positive suction head requirement for centrifugal slurry pumps2001In: Handbook of conveying and handling of particulate solids, Amsterdam: Elsevier, 2001, p. 491-497Chapter in book (Other academic)
  • 95.
    Whitlock, L.
    et al.
    GIW Industries Inc..
    Wilson, K.C.
    Queen's University.
    Sellgren, Anders
    Effect of near-wall lift on frictional characteristics of sand slurries2004In: Papers presented at Hydrotransport, 16th international conference / [ed] Nígel Heywood, Cranfield, UK: BHR Group Limited , 2004, p. 443-454Conference paper (Refereed)
    Abstract [en]

    The frictional characteristics of a fine-sand and medium-sand slurry were evaluated experimentally in a 0.1 m diameter pipeline loop system at the GIW Hydraulic Test Laboratory. The median particle sizes were 85 and 400 μm. For velocities of practical interest in the interval 1.5 to 3 m/s, and volumetric concentrations of solids from 12 to 34%, the fine-sand slurry behaved essentially as an equivalent fluid. With the medium sand at 17% concentration, the excess losses over those of water were high at low velocities, decreased with increasing velocity and dropped below the equivalent-fluid curve at about 4.2 m/s. This behaviour was related to an inertial hydrodynamic lift force that is effective in driving particles in the medium-sand size range away from the wall. A lift coefficient is defined for the inertial lift force associated with the log-law turbulent velocity profile. In the buffer zone nearer the pipe wall, it is proposed that this lift diminishes in a way that depends on a dimensionless ratio that includes the particle radius and the shear velocity. This trend is seen to be in general agreement with both the medium-sand and the fine-sand data.

  • 96.
    Wilson, K.C.
    et al.
    Department of Civil Engineering, Queen's University, Ellis Hall, Kingston, ON.
    Clift, R.
    Centre for Environmental Strategy, University of Surrey.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Operating points for pipelines carrying concentrated heterogeneous slurries2004In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 123, no 1, p. 19-24Article in journal (Refereed)
    Abstract [en]

    Early studies of slurry pipeline systems were based on moderate volumetric concentrations of solids (say up to 18%), for which the excess pressure gradient caused by solids is proportional to concentration. Much larger concentrations now coming into common use show more complicated behaviour. An algebraic analysis is developed to determine desirable operating points and associated energy consumption for settling slurries. This deals initially with the simple proportional behaviour, and then is extended to other cases. Comparison is made to recent experiments using highly concentrated settling slurries with various particle gradings. It is found that near-uniform gradings tend to have high frictional losses, while very broad gradings can give rise to energy-efficient transport at high concentrations

  • 97. Wilson, Kenneth C.
    et al.
    Addie, Graeme R.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Clift, R.
    Slurry transport using centrifugal pumps2006 (ed. 3.ed.)Book (Other academic)
    Abstract [en]

    Vast tonnages of solid-liquid mixtures are pumped every year in dredging operations, mining and waste-disposal applications. Most of these systems are centrifugal pumps, and the resolution of problems encountered in slurry pumping requires both detailed scientific knowledge and judgment derived from practical experience. For many years the combination of up-to-date analysis and hands-on experimentation has been provided to interested engineers in a short course based at the GIW Hydraulic Laboratory. The lecturers in this course, who represent a broad background of international expertise, have prepared this widely-recognized text, Slurry Transport Using Centrifugal Pumps, Third Edition. This unique text is logically divided into two sections: the first part of the book concentrates on the behaviors of various sorts of slurry flow, and the second part deals with the behavior of centrifugal pumps handling slurries, and with how pumps and pipelines interact as a system.

  • 98. Wilson, Kenneth C.
    et al.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Developments in slurry flow modelling in historical perspective2014In: 19th International Conference on Hydrotransport 2014: Golden, 24 - 26 September 2014, 2014, p. 279-290Conference paper (Refereed)
    Abstract [en]

    Durand's model attempted to find a single formula for sand size and above, but Babcock's data showed that a single formula could not apply. A subsequent group of models is based on Wilson's layered force-balance analysis of slurry flows; applied to friction losses and deposition limit. Models based on variants of this analysis include those by Shook and others at the Saskatchewan Research Council, SRC. Early versions of Wilson's model relied on particle fall velocity to find friction losses, but the classical iterative method of finding fall velocity has now been replaced by a direct method. This is based on the shear Reynolds number of the particle, which can be expressed in terms of the better known Archimedes number, making calculations of slurry friction and limit of deposition involve two principal parameters: the Archimedes number and the diameter ratio d/D.

  • 99.
    Wilson, Kenneth
    et al.
    Consultant, Canada.
    Sellgren, Anders
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Developments in slurry flow modelling in a historical perspective2016In: Canadian Journal of Chemical Engineering, ISSN 0008-4034, E-ISSN 1939-019X, Vol. 94, no 6, p. 1019-1024Article in journal (Refereed)
    Abstract [en]

    Durand's slurry flow model attempted to find a single formula for sand-size particles and larger, but Babcock's data showed that a single formula could not apply. A subsequent group of models is based on Wilson's layered force-balance analysis of slurry flows applied to friction losses and deposition limit. Models based on variants of this analysis include those by Shook and others at the Saskatchewan Research Council (SRC). Early versions of Wilson's model relied on particle fall velocity to find friction losses, but the classical iterative method of finding fall velocity has now been replaced by a direct method. This is based on the shear Reynolds number of the particle, which can be expressed in terms of the better known Archimedes number. Thus, calculations of slurry friction and limit of deposition involve two principal parameters: the Archimedes number and the diameter ratio d/D.

12 51 - 99 of 99
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