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What is a centrifugal pump?

What is a centrifugal pump?. Three basic components: Volute, casing, body or Diffuser Impeller or impellers Driver (motor). Pump Impeller. Direction of rotation. Vanes. Typical single suction impeller. Single suction impeller. Impeller Types. Open Semi-open Closed Single suction

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What is a centrifugal pump?

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  1. What is a centrifugal pump? Three basic components: • Volute, casing, body • or Diffuser • Impeller • or impellers • Driver (motor)

  2. Pump Impeller Direction of rotation Vanes Centrifugal Pumps

  3. Typical single suction impeller Centrifugal Pumps

  4. Single suction impeller Centrifugal Pumps

  5. Impeller Types • Open • Semi-open • Closed • Single suction • Double suction • Non-clogging • Axial flow • Mixed flow Centrifugal Pumps

  6. Full Diameter Impeller Vs Vr Vt Vr = Radial Velocity Vt = Tangential Velocity Vs = Vector Sum Velocity Rotation Impeller Blades Centrifugal Pumps

  7. Impeller and volute Arrows represent the direction of water flow Discharge Nozzle Cutwater Suction Eye Centrifugal Pumps

  8. End Suction Pump • 26 sizes • To 4400 gpm • To 520 ft TDH • To 150 HP To 8”x10” • General Purpose Motor Series 1510 Centrifugal Pumps

  9. Section View Bell & Gossett Series 1510 Standard Construction Gauge Taps Centrifugal Pumps

  10. Close-Coupled Pump • 20 sizes • To 2600 gpm • To 520 ft TDH • To 60 HP • To 6”x8” • Special Purpose Motor Series 1531 Pump Centrifugal Pumps

  11. Large, Line Mounted Pump • Close coupled • 18 sizes • To 2600 gpm • To 410 ft TDH • To 60 HP • To 8”x8” • Special Purpose Motor Series 80 Centrifugal Pumps

  12. Multi-stage pumps • Multi-stage, diffuser design • 8 sizes, stainless steel • to 600 gpm • to 1200 ft • to 75 hp, 3500 rpm • many options for suction and discharge nozzles Bell & Gossett Series 3550 Centrifugal Pumps

  13. Multi-stage pump “Diffusers” Bell & Gossett Series 3550 Centrifugal Pumps

  14. Vertical Turbine • Submersible • 48 Models • 5 - 14 bowls • 40 - 2000 gpm • 25 - 300 feet head • Lineshaft • 88 Models • 5-20” bowls • 4 Styles • 20 - 10,000 gpm • 7 - 200 feet head Centrifugal Pumps

  15. Double Suction Pump • 37 sizes • To 12500 gpm • To 840 ft TDH • To 1000 HP • To 14”x18” • General Purpose Motor Bell & Gossett Series HSC Centrifugal Pumps

  16. Typical Split Case Pump- Section View Centrifugal Pumps

  17. Double Suction Pump Series VSC • 17 sizes • To 8000 gpm • To 400 ft TDH • To 600 HP • To 12”x14” • General Purpose Motor Series VSCS Centrifugal Pumps

  18. VSC Pump- Section View Centrifugal Pumps

  19. Pump Construction • Standard construction, any impeller • Mechanical seal • Internally flushed, seal cavity • Variety of seal materials • Stuffing box construction, any impeller • External flush lines • Compression packing rings • Single flushed mechanical seal Centrifugal Pumps

  20. Standard construction Bell & Gossett Series 1510 Standard Construction Centrifugal Pumps

  21. Seals Vessel Environment Wall Shaft Process Fluid Leakage Centrifugal Pumps

  22. B&G Pump Construction • Standard construction, any impeller • Mechanical seal • Internally flushed, seal cavity • Variety of seal materials Centrifugal Pumps

  23. Mechanical Seal Stationary Assembly Graphite Seal Ring Ceramic Seal Insert Compression Ring Retainer (Sec Seal) Gasket Secondary Seal (Seal Bellows) Impeller Rotary Assy Centrifugal Pumps

  24. Seal Cavity Centrifugal Pumps

  25. Standard construction Bell & Gossett Series 1510 Standard Construction Centrifugal Pumps

  26. Limits On Seal Performance • Temperature of the flushing water. • 225ºF to 250ºF • System pH. • 7 to 9 for ceramic seals • up to 11 for tungsten carbide seals • Concentration of dissolved solids. • TDS less than 1000 ppm • Concentration of suspended solids. • Less than 20 ppm • Silica, less than 10 ppm Centrifugal Pumps

  27. Internally Flushed Mechanical Seals Bell & Gossett Series HSC3 Standard Construction Centrifugal Pumps

  28. Pump Construction • Stuffing box construction, any impeller • External flush lines • Internal or External Fluid • Compression packing rings • Single flushed mechanical seal Centrifugal Pumps

  29. Packing Vessel Wall Environment Shaft Process Fluid Leakage Centrifugal Pumps

  30. Stuffing box with packing Centrifugal Pumps

  31. Packing Installation Centrifugal Pumps

  32. Bypass Flush Line Bell & Gossett Series HSC-S Centrifugal Pumps

  33. Liquid-Abrasives Separator Centrifugal Pumps

  34. What’s “suitable”…? • Impeller • Single suction or double suction. • Volutes • Base mounted or in-line. • Internally flushed or stuffing box. • Single stage or multi stage. • Packing, seal or wet rotor. Centrifugal Pumps

  35. Angular Misalignment Centrifugal Pumps

  36. Parallel or Offset Misalignment Centrifugal Pumps

  37. Suction Piping Detail 5 dia. RIGHT WRONG 1. Pipe weight hangs on pump flange. 2. Short suction pipe results in uneven impeller loading. 1. Pipe supported 2. Length of suction piping allows even impeller loading Centrifugal Pumps

  38. Why 5 diameters? Single Suction Impeller Centrifugal Pumps

  39. Installation Centrifugal Pumps

  40. Typical installation

  41. Flow Pump Motor Hoist Beam Trolley with Manual Hook-Type Hoist Triple Duty Valve Suction Diffuser Elbow Support (Anchor to Base) Solid Base Foundation

  42. Vertical Turbine Pump Driver Discharge Head Column Bowl Assembly Centrifugal Pumps

  43. Comments?Questions?Observations?

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