9. Production of solids in a pump-pipeline system
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9. Production of solids in a pump-pipeline system

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9. Production of solids in a pump-pipeline system 9. Production of solids in a pump-pipeline system Presentation Transcript

  • oe4625 Dredge Pumps and Slurry Transport Vaclav Matousek October 13, 2004 1 Dredge Pumps and Slurry Transport Vermelding onderdeel organisatie
  • 9. PRODUCTION OF SOLIDS IN A PUMP-PIPELINE SYSTEM PRODUCTION RANGE PRODUCTION LIMITATION BY PIPE LENGTHPRODUCTION LIMITATION BY PUMP POSITION October 13, 2004 2 Dredge Pumps and Slurry Transport
  • Flow Parameters: Production of Solids The production of solids is an important parameter from the economic point of view. It gives the amount of dry solids delivered at the pipeline outlet over a certain time period.This is defined as the (volumetric) flow rate of solids at the outlet of a slurry pipeline π  m3  Qs = 2 D V m C vd 3600  hour  4  During a dredging operation the parameters Vm and Cvd are usually measured in a pipeline of known D so that the production of solids given by a solids flow rate can be determined. October 13, 2004 3 Dredge Pumps and Slurry Transport
  • Flow Parameters: Production of Solids The production of solids is an important parameter from the economic point of view. It gives the amount of dry solids delivered at the pipeline outlet over a certain time period.This is defined as the (volumetric) flow rate of solids at the outlet of a slurry pipeline ρm − ρ f  m3  Q s = Q m C vd = Qm  sec  ρs − ρ f  During a dredging operation the parameters Vm and Cvd are usually measured in a pipeline of known D so that the production of solids given by a solids flow rate can be determined. October 13, 2004 4 Dredge Pumps and Slurry Transport
  • PRODUCTION RANGE OPERATIONAL LIMITS MAXIMUM ATTAINABLE PRODUCTION MINIMUM ACCEPTABLE PRODUCTIONOctober 13, 2004 5Dredge Pumps and Slurry Transport
  • MAXIMUM VELOCITY IN THE SYSTEM Vac Patm − PS = ρf g ρf g (Vac)d Patm − Pvapour Vm 2 = + − NPSHR ρf g ρf g 2g DecisiveOctober 13, 2004 vacuum curve, (Vac)d & vacuum curves of suction pipe, Vac. 6Dredge Pumps and Slurry Transport
  • EFFECT OF PUMP POSITION ON OPERATIONAL LIMITSOctober 13, 2004 7Dredge Pumps and Slurry Transport
  • PRODUCTION RANGE MAXIMUM ATTAINABLE PRODUCTIONOctober 13, 2004 Figure. Production limited by decisive vacuum. Qm-Qs diagram. 8Dredge Pumps and Slurry Transport
  • PRODUCTION RANGE OPERATIONAL LIMITSOctober 13, 2004 Decisive vacuum curve & vacuum curves of suction pipe. 9Dredge Pumps and Slurry Transport
  • PRODUCTION RANGE MAXIMUM ATTAINABLE PRODUCTIONOctober 13, 2004 Figure. Production limited by decisive vacuum. Qm-Qs diagram. 10Dredge Pumps and Slurry Transport
  • PRODUCTION RANGE MINIMUM ACCEPTABLE PRODUCTION ProductionOctober 13, 2004 limited by decisive vacuum and deposition-limit velocity. 11Dredge Pumps and Slurry Transport
  • PRODUCTION LIMITATIONSI. Too Short Pipeline: the pump tends to operate outside a normal working range, the pump speed must be lowered to avoid cavitationII. Pipeline Distance Within a Normal Working Range of a Pump: a pump operates at maximum speed and mixture of maximum attainable density is transportedIII. Too Long Pipeline: the pump tends to operate outside a normal working range, the mixture density must be lowered to maintain velocity above the deposition limit in a pipeline October 13, 2004 12 Dredge Pumps and Slurry Transport
  • PRODUCTION LIMITATIONSI. Too Short PipelineII. Pipeline Distance Within a Normal Working Range of a PumpIII. Too Long Pipeline October 13, 2004 13 Dredge Pumps and Slurry Transport
  • PRODUCTION LIMITATIONSI. Too Short PipelineII. Pipeline Distance Within a Normal Working Range of a PumpIII. Too Long Pipeline October 13, 2004 14 Dredge Pumps and Slurry Transport