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  • 1.
    Matoušek, Václav
    et al.
    Czech Technical University in Prague Civil Engineering, Prague, Czech Republic.
    Visintainer, Robert
    GIW Industries, Inc., Grovetown, GA, United States.
    Furlan, John
    GIW Industries, Inc., Grovetown, GA, United States.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Threshold Criteria for Components of Predictive Model for Pipe Flow of Broadly-Graded Slurry2018Ingår i: ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting: Volume 3: Fluid Machinery; Erosion, Slurry, Sedimentation; Experimental, Multiscale, and Numerical Methods for Multiphase Flows; Gas-Liquid, Gas-Solid, and Liquid-Solid Flows; Performance of Multiphase Flow Systems; Micro/Nano-Fluidics, The American Society of Mechanical Engineers , 2018, Vol. 3, artikel-id T19A008Konferensbidrag (Refereegranskat)
    Abstract [en]

    Industrial slurries transported in pressurized pipelines often consist of particles of broad size distribution. The broad particle size distribution affects slurry flow behavior in a pipe. A four-component model (4CM) predicts the frictional pressure drop in pipe flow of broadly graded slurry. The model considers Newtonian carrying liquid and splits the broadly graded solids into fractions (components) each of which contributes to the pressure drop through its own dominating friction mechanism expressed by a particular sub-model in the 4CM. The sorting of the solids into the components (carrier, pseudo-homogeneous, heterogeneous, fully-stratified) must be based on appropriate criteria. For the sake of simplicity, the 4CM currently uses threshold sizes of particles to split the solids into 4 components.

    The goal of the present work is to analyze the existing criteria for the threshold between the pseudo-homogeneous component and heterogeneous component and for the threshold between the heterogeneous component and fully-stratified component. The analysis is based on a description of mechanisms governing particle support (suspension, deposition) of each particular solids component in slurry flow. It shows that the existing grain-size thresholds actually express certain proportions among threshold velocities of flow delimiting different slurry flow regimes. Such threshold velocities are the deposition-limit velocity, the initial-suspension velocity, and the full-suspension velocity. We discuss the proportions and demonstrate how properties (of liquid, solids, flow) and associated parameters additional to the grain size may influence the thresholds.

    The analytical results are supported by experimental results for flow of individual components in a laboratory loop.

  • 2.
    Visintainer, Robert J.
    et al.
    GIWIndustries, United States.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Furlan, John M.
    GIWIndustries, United States.
    McCall, George
    GIWIndustries, United States.
    Centrifugal pump performance deratings for a broadly graded (4-component) slurry2017Ingår i: International Conferences on Transport and Sedimentation of Solid Particles 2017, Wydawnictwo Uniwersytetu Przyrodniczego we Wroclawiu , 2017, s. 359-367Konferensbidrag (Refereegranskat)
    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.

  • 3.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    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 approach2017Ingår i: 20th International Conference on Hydrotransport, BHR Group Limited , 2017, s. 401-414Konferensbidrag (Refereegranskat)
    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%

  • 4.
    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 tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Matoušek, Václav
    Czech Technical University, Prague.
    Comprehensive loop testing of a broadly graded (4-component) slurry2017Ingår i: 20th International Conference on Hydrotransport, BHR Group Limited , 2017, s. 307-323Konferensbidrag (Refereegranskat)
    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.

  • 5.
    Matoušek, Václav
    et al.
    Ceske vysoke uceni technicke v Praze, Department of Hydraulics and Hydrology, Prague, Czech Republic.
    Visintainer, Robert J.
    GIW Industries, United States.
    Furlan, John M.
    GIW Industries, United States.
    McCall, George
    GIW Industries, United States.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Deposition limit velocity: Effect of particle size distribution2017Ingår i: International Conferences on Transport and Sedimentation of Solid Particles 2017 / [ed] Matousek V.,Sobota J.,Vlasak P., Wydawnictwo Uniwersytetu Przyrodniczego we Wroclawiu , 2017, s. 217-224Konferensbidrag (Refereegranskat)
    Abstract [en]

    Industrial settling slurries often consist of particles of very different sizes; the particle size distribution may cover sizes which differ with two orders of magnitude. A broad particle size distribution affects parameters of slurry flow including deposition limit velocity. We present experimental results of the deposition limit velocity collected during a comprehensive experimental campaign testing slurry flows composed of solids of different fractions in the GIW Hydraulic Laboratory in 2016. Four narrow graded fractions (carrier fluid, pseudo-homogeneous, heterogeneous, and stratified) were tested in permutations from the individual components to the complete mixture at various concentrations. The primary experiments were carried out in a 203-mm pipe, and selected corresponding experiments were repeated in a 103-mm pipe. The experimental results show that interactions among components affect the resulting deposition limit velocity in flows of broadly graded settling slurries. The effect of particle size distribution on the deposition limit velocity is not benign. The deposit velocity is not necessarily lower in a flow of slurry composed of four components than in slurry flow of one component with the highest deposit velocity from the four components. We discuss possible modifications of a deposit velocity predictive model in order to take effects of a broad particle size distribution into account.

  • 6.
    Furlan, John M.
    et al.
    GIW Industries Inc., Department of Engineering and R&D.
    Visintainer, Robert J.
    GIW Industries, Department of Engineering and R&D.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Centrifugal pump performance when handling highly non-Newtonian clays and tailings slurries2016Ingår i: Canadian Journal of Chemical Engineering, ISSN 0008-4034, E-ISSN 1939-019X, Vol. 94, nr 6, s. 1108-1115Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Recent loop testing performed at the GIW Hydraulic Lab (Furlan et al. 2013, 2014) has provided pump performance data for two highly non-Newtonian slurries of significantly different character: a high clay content slurry with minimal coarse solids; and a typical, low clay content, two component tailings slurry. The importance of air removal in the sump and pipe loop was demonstrated using a simple, yet novel de-aeration system. In addition to the measurement of performance losses, determination of the upper limit of "pumpability" for these slurries relative to their concentration and associated yield stress was investigated. However, once the slurry was de-aerated, no limits could be found, other than those dictated by suction side losses (NPSHA) or excessive pipeline friction gradients, indicating that the only true limit in practice is one of system economics, i.e. pump operating and capital cost. Experimentally measured pump head and efficiency were compared against corresponding predictions from two different models: the Walker and Goulas technique (Walker and Goulas, 1983), and the Graham et al. technique (Graham et al., 2009), with special focus given to the dependence of the losses on pump rotary speed.

  • 7.
    Wilson, Kenneth
    et al.
    Consultant, Canada.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Developments in slurry flow modelling in a historical perspective2016Ingår i: Canadian Journal of Chemical Engineering, ISSN 0008-4034, E-ISSN 1939-019X, Vol. 94, nr 6, s. 1019-1024Artikel i tidskrift (Refereegranskat)
    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.

  • 8.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    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 gradings2016Ingår i: Canadian Journal of Chemical Engineering, ISSN 0008-4034, E-ISSN 1939-019X, Vol. 94, nr 6, s. 1025-1031Artikel i tidskrift (Refereegranskat)
    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

  • 9.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    How many industrial slurries behave when transported2015Konferensbidrag (Refereegranskat)
  • 10.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Furlan, J.M.
    GIW Industries Inc..
    Visintainer, R.J.
    GIW Industries Inc..
    Centrifugal pump performance on a high-yield stress tailings slurry2014Ingår i: Paste 2014: Proceedings of the 17th International Seminar on Paste and Thickened Tailings, Vancouver, Canada, 8-12 June 2014, InfoMine Inc. , 2014, s. 525-538Konferensbidrag (Refereegranskat)
  • 11.
    Furlan, John M.
    et al.
    GIW Industries Inc..
    Visintainer, Robert J.
    GIW Industries Inc..
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Centrifugal pump performance when handling highly non-Newtonian clays and tailings slurries2014Ingår i: 19th International Conference on Hydrotransport 2014: Golden, 24 - 26 September 2014, Curran Associates, Inc., 2014, s. 117-130Konferensbidrag (Refereegranskat)
    Abstract [en]

    Recent loop testing performed at the GIW Hydraulic Lab (Furlan et al. 2013, 2014) has provided pump performance data for two highly non-Newtonian slurries of significantly different character: a high clay content slurry with minimal coarse solids; and a typical, low clay content, two component tailings slurry. The importance of air removal in the sump and pipe loop was demonstrated using a simple, yet novel de-aeration system. In addition to the measurement of performance losses, determination of the upper limit of "pumpability" for these slurries relative to their concentration and associated yield stress was investigated. However, once the slurry was de-aerated, no limits could be found, other than those dictated by suction side losses (NPSHA) or excessive pipeline friction gradients, indicating that the only true limit in practice is one of system economics, i.e. pump operating and capital cost. Experimentally measured pump head and efficiency were compared against corresponding predictions from two different models: the Walker and Goulas technique (Walker and Goulas, 1983), and the Graham et al. technique (Graham et al., 2009), with special focus given to the dependence of the losses on pump rotary speed.

  • 12. Wilson, Kenneth C.
    et al.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Developments in slurry flow modelling in historical perspective2014Ingår i: 19th International Conference on Hydrotransport 2014: Golden, 24 - 26 September 2014, 2014, s. 279-290Konferensbidrag (Refereegranskat)
    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.

  • 13.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    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 gradings2014Ingår i: 19th International Conference on Hydrotransport 2014: Golden, 24 - 26 September 2014, 2014, s. 131-143Konferensbidrag (Refereegranskat)
    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.--------------------------------------------------------------------------------

  • 14.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Furlan, J.M.
    GIW Industries Inc..
    Visintainer, R.J.
    GIW Industries Inc..
    Pumping a 100-600 Pa yield stress clay slurry with a centrifugal pump2013Ingår i: 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, s. 531-543Konferensbidrag (Refereegranskat)
  • 15.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Advances in thickened tailings pumping using centrifugal pumps2012Ingår i: Paste 2012: Proceedings of the 15th International Seminar on Paste and Thickened Tailings, Sun City, South Africa, 16-19 April 2012, Australian Centre for Geomechanics, 2012, s. 285-296Konferensbidrag (Refereegranskat)
  • 16.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    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 limit2011Konferensbidrag (Refereegranskat)
  • 17.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    A note on depositional behaviour and conduit flow resistance of complex slurries2010Ingår i: Conference in Minerals Engineering: Luleå, 2 -3 februari 2010 / [ed] Johanna Alatalo, Luleå: Luleå tekniska universitet, 2010, s. 185-196Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Slurries in mineral processing typically have average particles sizes of 20 to 100μm with maximum sizes of up to 500 to 1000μm. With solids volumetric concentrations varying from a few percent up to and over 40% the corresponding slurries are here termed complex because they cover an intermediate area between "non-settling" and "settling" types of mixtures. Depositional and flow resistance behaviours, some of which may be considered counter-intuitive, are discussed based on reported observations with heavy ore concentrates, tailings and sand slurries.

  • 18.
    Wennberg, Thord
    et al.
    LKAB.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Whitlock, Lee
    GIW Industries Inc..
    Predicting the performance of centrifugal pumps when handling complex slurries2008Ingår i: Proceedings of the 14th International conference on transport & sedimentation of solids particles: June 23-25, Saint Petersburg, Russia, 2008, 2008, s. 324-333Konferensbidrag (Refereegranskat)
    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.

  • 19.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Wilson, Kenneth C.
    Revised method for calculating stratification ratios for hetrogeneous flows2008Ingår i: Conference Proceedings, 14th International Conference on Transport and Sedimentation of Solid Particles: 23-25 June 2008, Saint Petersburg, Russia, 2008, s. 334-340Konferensbidrag (Refereegranskat)
    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*.

  • 20.
    Wennberg, Thord
    et al.
    LKAB.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Goldkuhl, Ingemar
    MultiServ AB.
    Rheological and depositional characterisation of paste-like tailings slurries2008Ingår i: Conference in Minerals Engineering 2008, Luleå: Luleå tekniska universitet, 2008, s. 151-160Konferensbidrag (Övrigt vetenskapligt)
    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.

  • 21.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    System aspects on in-pit crushing and coarse-particle pumping2008Ingår i: Conference in Minerals Engineering 2008, Luleå: Luleå tekniska universitet, 2008, s. 119-125Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The feasibility of pumping tertiary crushed raw ore together with mine water with centrifugal slurry pumps in series is briefly demonstrated in a comparison with truck transport to the processing plant. Pumping can also be effective if considered early in the mine planning because of less waste rock handling. Furthermore, in large-scale open-pit mining, only a 0.5 m-diameter pipeline is required for up to 20 Mtonnes per year. Tertiary crushing with an autogeneous type of crusher giving a comparatively wide particle size distribution may gain some effectiveness in the pumping, however the system integration potential can mainly be related to possible energy savings and increased throughput in grinding operations as outlined by Lindqvist (2008).

  • 22.
    Addie, Graeme R.
    et al.
    GIW Industries Inc..
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    A first slurry standard and some implications for paste application2007Ingår i: Paste 2007: proceedings of the tenth International Seminar on Paste and Thickened Tailings / [ed] Andy Fourie; Richard Jewell, Perth: Australian Centre for Geomechanics, 2007, s. 153-162Konferensbidrag (Refereegranskat)
    Abstract [en]

    The Hydraulic Institute has just completed the task of developing a new ANSI/HI standard on Rotodynamic (Centrifugal) Slurry Pumps covering nomenclature, definitions, applications, and operation. The standard provides examples of all the different types of pumps available and has an extensive section on definitions. Slurries and their effect on performance and wear are covered. A slurry service class is established which then is used to limit velocities and head produced per pump to give acceptable wear. A special section deals with mechanical seals and a new method for determining flange loads is presented and guidelines are given for commissioning, start-up etc.The head limits and the performance derating are of special interest when centrifugal slurry pumps are applied to thickened tailings and paste-like slurries. For Newtonian liquids, the Hydraulic Institute's Viscosity Correction Method (ANSI/HI 2004) provides a procedure widely used for viscous effects on the performance. For the homogeneous flow of viscous slurries, the new slurry standard refers to an applicable viscosity to use with the method and to "consult the pump manufacturer for guidance regarding non-Newtonian slurry pump performance."Experimental performance results are presented here and applied to the viscosity correction method for a simulated tailings product slurry characterized by a fully sheared yield stress of about 100 Pa, evaluated from pipeline data. The pump was a GIW-LCC type three-vane all metal unit with a 0.3m-diameter impeller having an open shroud with a simple auger-like inducer. Results are also given for an underground hydraulic fill product characterized by a Newtonian kinematic viscosity which is 1300 times that for water. The different results obtained here point out the strong influence the rheological behavior has on the choice of pump size and the power requirement.

  • 23.
    Wennberg, Thord
    et al.
    LKAB.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Pumping evaluations with paste tailings thickened close to the surface disposal area2007Ingår i: 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, s. 561-574Konferensbidrag (Refereegranskat)
    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.

  • 24.
    Addie, Graeme R.
    et al.
    GIW Industries Inc..
    Roudnev, Aleksander S.
    Weir Minerals North America.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    The new ANSI/HI centrifugal slurry pump standard2007Ingår i: Journal of the South African Institute of Mining and Metallurgy, ISSN 0038-223X, Vol. 107, nr 6, s. 403-409Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The Hydraulic Institute has completed the task of developing a new ANSI/HI standard 12.1-12.6 (2005) for Rotodynamic (Centrifugal) Slurry Pumps covering nomenclature, definitions, applications, and operation. The standard provides examples of the different slurry pump types and contains an extensive section on pump and slurry definitions. The effect of slurry on pump performance is covered along with the pumping of froth. Reference is also made to ANSI/HI standard 9.6.7 (2004), which contains a new method for pump performance correction when handling viscous fluids.Classification of slurry services is established and then is used to determine limitations on velocities and total head per pump in order to obtain acceptable wear performance. The new service class, head per stage and other limits are directly related to capital and other cost considerations that will affect solids transport system economics. The writers review the contents of the new standard, highlight the main points, and discuss the reason for the slurry classification, corresponding limits and expected implications, particularly with respect to operating costs of the pumps in solids transport systems.

  • 25.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Wilson, Kenneth C.
    Queen’s University, Kingston, Ontario.
    Validation of a four-component pipeline friction loss model2007Ingår i: Hydrotransport 17: the 17th International Conference on the Hydraulic Transportation of Solids in Pipes, South African Institute of Mining and Metallurgy, 2007, s. 193-204Konferensbidrag (Refereegranskat)
    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.

  • 26.
    Addie, G.R.
    et al.
    GIW Industries Inc..
    Roudnev, A.S.
    Weir Minerals North America.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Weir Minerals North America2007Ingår i: 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, s. 205-218Konferensbidrag (Refereegranskat)
    Abstract [en]

    The Hydraulic Institute has completed the task of developing a new ANSI/HI standard 12.1-12.6 (2005) for rotodynamic (centrifugal) slurry pumps covering nomenclature, definitions, applications, and operation. The standard provides examples of the different slurry pump types and contains an extensive section on pump and slurry definitions. The effect of slurry on pump performance is covered along with the pumping of froth. Reference is also made to ANSI/HI standard 9.6.7 (2004), which contains a new method for pump performance correction when handling viscous fluids. Classification of slurry services is established and then is used to determine limitations on velocities and total head per pump in order to obtain acceptable wear performance. The new service class, head per stage and other limits are directly related to capital and other cost considerations that will affect solids transport system economics. The writers review the contents of the new standard, highlight the main points, and discuss the reason for the slurry classification, corresponding limits and expected implications, particularly with respect to operating costs of the pumps in solids transport systems

  • 27.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Wilson, Kenneth C.
    Effect of strongly non-Newtonian slurries on the head and efficiency of centrifugal pumps2006Ingår i: Proceedings: International Conference of Transport and Sedimentation of Solid Particles, 2006Konferensbidrag (Refereegranskat)
  • 28.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Wilson, Kenneth C.
    Queen's University.
    Pressure drops for pipeline transport of slurries with broad grading2006Ingår i: Proceedings of the 5th International Conference for conveying and handling of particulate solids: CHoPS-05, 2006Konferensbidrag (Refereegranskat)
  • 29. Wilson, Kenneth C.
    et al.
    Addie, Graeme R.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Clift, R.
    Slurry transport using centrifugal pumps2006 (uppl. 3.ed.)Bok (Övrigt vetenskapligt)
    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.

  • 30.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Stora regnmängder över gruvområden2006Ingår i: Konferens i mineralteknik / [ed] Marianne Thomaeus; Eric Forssberg, Föreningen Mineralteknisk Forskning / Swedish Mineral Processing Research Association , 2006Konferensbidrag (Övrigt vetenskapligt)
  • 31.
    Wennberg, Thord
    et al.
    LKAB.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Sundqvist, Åsa
    LKAB.
    Feasibility considerations of high density disposal at the LKAB Svappavaara concentrator2005Ingår i: Securing the future: international conference on mining and the environment, metals and energy recovery : proceedings, Stockholm: SweMin , 2005, s. 994-1003Konferensbidrag (Refereegranskat)
  • 32.
    Tano, Kent
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser.
    Pålsson, Bertil
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    On-line lifter deflection measurements showing flow resistance effects in grinding mills2005Ingår i: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 18, nr 11, s. 1077-1085Artikel i tidskrift (Refereegranskat)
    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.

  • 33.
    Addie, Graeme
    et al.
    Engineering and Research and Development, GIW Industries Inc.
    Carstens, M.
    GIW Industries Inc..
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Visintainer, R.
    GIW Industries Inc..
    Whitlock, L
    Hydraulic Test Lab., GIW Industries Inc.
    Pipeline design characteristics of some industrial paste-like slurries2005Ingår i: Conference Proceedings - First Extractive Metallurgy Operators' Conference, The Australian Institute of Mining and Metallurgy , 2005, s. 147-154Konferensbidrag (Refereegranskat)
    Abstract [en]

    There is a wide variety of industrial pastes or non-settling slurries pumped in mining, dredging and reclamation projects as products, refuse and tails. The types and/or names of some of the common ones are alumina red mud, phosphate clays, tar sands mature fine tails, tar sands (CT) consolidated clays and fly ash. The pipeline performance or friction of these varies dramatically with the type, its concentration and the particulars of the actual slurry making it difficult to select pumping equipment and to design associated pipelines. The GIW Hydraulic Laboratory in Grovetown Georgia has tested a number of these slurries over the last 30 years for various mining customers. Where available in the public domain and/or where permission has been obtained, the results of those tests are presented in this paper in a form usable for pipeline and pump system designers and users.

  • 34.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    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 cost2005Ingår i: Proceedings, WEDA XXV and Texas A& M Annual Dredging Seminar, Western Dredging Association , 2005Konferensbidrag (Refereegranskat)
    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.

  • 35.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Addie, Greame
    GIW Industries Inc..
    Whitlock, L
    GIW Industries Inc..
    Technical-economical feasibility of using centrifugal pumps in high-density thickened tailings slurry systems2005Ingår i: 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, s. 195-204Konferensbidrag (Refereegranskat)
    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.

  • 36.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Addie, Graeme R.
    Whitlock, L.
    The feasibility of transporting contaminated sediments as a slurry using centrifugal pumps2005Ingår i: 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 , 2005Konferensbidrag (Refereegranskat)
    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.

  • 37.
    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 slurries2004Ingår i: Papers presented at Hydrotransport, 16th international conference / [ed] Nígel Heywood, Cranfield, UK: BHR Group Limited , 2004, s. 443-454Konferensbidrag (Refereegranskat)
    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.

  • 38. Whitlock, L.
    et al.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Addie, Graeme R.
    Energy requirement for pumping sand slurries: comparison of large-scale loop and field results with a design model2004Ingår i: 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, s. 22-35Konferensbidrag (Refereegranskat)
  • 39. Sundqvist, Å.
    et al.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Large-scale pump tests with coarse waste rock2004Ingår i: 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, s. 127-136Konferensbidrag (Refereegranskat)
  • 40.
    Sundqvist, Å.
    et al.
    Luossavaara-Kiirunavaara AB.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Large-scale testing of coarse waste rock pumping2004Ingår i: Papers presented at Hydrotransport, 16th international conference / [ed] Nigel Heywood, Cranfield, UK: BHR Group Limited , 2004, s. 127-136Konferensbidrag (Refereegranskat)
    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

  • 41.
    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 tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Operating points for pipelines carrying concentrated heterogeneous slurries2004Ingår i: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 123, nr 1, s. 19-24Artikel i tidskrift (Refereegranskat)
    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

  • 42.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Berggren, Andreas
    Boliden Mineral AB.
    Tano, Kent
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser.
    Some aspects of slurry flows in a mill2004Ingår i: Konferens i mineralteknik / [ed] Marianne Thomaeus; Eric Forssberg, Föreningen Mineralteknisk Forskning / Swedish Mineral Processing Research Association , 2004Konferensbidrag (Övrigt vetenskapligt)
  • 43. Engman, M.
    et al.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Sundqvist, A.
    Goldkuhl, I.
    Wennberg, T.
    Some design considerations of high density base metal tailings handling systems2004Ingår i: Proceedings of the 12th international conference on Transport & sedimentation of solid particles joined with 12th international symposium on Freight pipelines: 20-24 September 2004, Prague, Czech Republic, Prague: Institute of Hydrodynamics, Academy of Sciences of the Czech Republic , 2004, s. 307-318Konferensbidrag (Refereegranskat)
  • 44.
    Engman, M.
    et al.
    LKAB.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Sundqvist, Å,
    LKAB.
    Wennberg, Thord
    Goldkuhl, I.
    Multiserv.
    Users perspective on the design of high density base metal tailings systems2004Ingår i: Tailings and mine waste '04: Proceedings of the Eleventh International Conference on Tailings and Mine Waste, Rotterdam: Balkema Publishers, A.A. / Taylor & Francis The Netherlands , 2004, s. 45-54Konferensbidrag (Refereegranskat)
  • 45.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Effektiv rörtransport av avvattnat avloppsslam2003Rapport (Övrigt vetenskapligt)
    Abstract [sv]

    Kostnadsbalansen mellan kapital, energi, underhåll och glidfilminjicering av polymerer beskrivs i en livscykelbaserad modellansats för torrslamspumpning. Vidare beskrivs ett dimensioneringsverktyg för slampumpning vid torrsubstanshalter (TS) upp till 8 %. Tester med centrifugalpumpar för TS-halter upp mot 10 % presenteras.

  • 46.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Wilson, Kenneth C.
    Queen’s University, Kingston, Ontario.
    Interaction of particles and near-wall lift in slurry pipelines2003Ingår i: Journal of Hydraulic Engineering, ISSN 0733-9429, E-ISSN 1943-7900, Vol. 129, nr 1, s. 73-76Artikel i tidskrift (Refereegranskat)
    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.

  • 47.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Transporthantering av avvattnat avloppsslam2003Ingår i: Konferens i mineralteknik: Luleå, Sweden February 4-5, 2003 / [ed] Marianne Thomaeus; Eric Forssberg, MinFo , 2003Konferensbidrag (Övrigt vetenskapligt)
  • 48.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Furtenbach, Lars
    Metso Mineral.
    Berggren, Andreas
    Boliden Mineral AB.
    Utflöde från kvarnar: modellförsök2002Ingår i: Konferens i mineralteknik / [ed] Marianne Thomaeus; Eric Forssberg, Föreningen Mineralteknisk Forskning / Swedish Mineral Processing Research Association , 2002Konferensbidrag (Övrigt vetenskapligt)
  • 49.
    Sellgren, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Addie, Graeme
    GIW Industries Inc..
    Pagalthivarthi, Krishnan
    Indian Institute of Technology.
    Wear and the total cost of ownership of slurry pumps2002Ingår i: 2002 ASME Joint U.S.-European Fluids Engineering Conference: FEDSM 2002, 2002, s. 205-209Konferensbidrag (Refereegranskat)
    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.

  • 50.
    Whitlock, L.
    et al.
    GIW Industries Inc..
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Wilson, K.
    Queen's University.
    Net positive suction head requirement for centrifugal slurry pumps2001Ingår i: Handbook of conveying and handling of particulate solids, Amsterdam: Elsevier, 2001, s. 491-497Kapitel i bok, del av antologi (Övrigt vetenskapligt)
12 1 - 50 av 99
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