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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

1. 1. oe4625 Dredge Pumps and Slurry Transport Vaclav Matousek October 13, 2004 1 Dredge Pumps and Slurry Transport Vermelding onderdeel organisatie
2. 2. 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
3. 3. 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
4. 4. 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
5. 5. PRODUCTION RANGE OPERATIONAL LIMITS MAXIMUM ATTAINABLE PRODUCTION MINIMUM ACCEPTABLE PRODUCTIONOctober 13, 2004 5Dredge Pumps and Slurry Transport
6. 6. 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
7. 7. EFFECT OF PUMP POSITION ON OPERATIONAL LIMITSOctober 13, 2004 7Dredge Pumps and Slurry Transport
8. 8. PRODUCTION RANGE MAXIMUM ATTAINABLE PRODUCTIONOctober 13, 2004 Figure. Production limited by decisive vacuum. Qm-Qs diagram. 8Dredge Pumps and Slurry Transport
9. 9. PRODUCTION RANGE OPERATIONAL LIMITSOctober 13, 2004 Decisive vacuum curve & vacuum curves of suction pipe. 9Dredge Pumps and Slurry Transport
10. 10. PRODUCTION RANGE MAXIMUM ATTAINABLE PRODUCTIONOctober 13, 2004 Figure. Production limited by decisive vacuum. Qm-Qs diagram. 10Dredge Pumps and Slurry Transport
11. 11. PRODUCTION RANGE MINIMUM ACCEPTABLE PRODUCTION ProductionOctober 13, 2004 limited by decisive vacuum and deposition-limit velocity. 11Dredge Pumps and Slurry Transport
12. 12. 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
13. 13. 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
14. 14. 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
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