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

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Presentation on theme: "What is a centrifugal pump? Three basic components: u Volute, casing, body –or Diffuser u Impeller –or impellers u Driver (motor)"— Presentation transcript:

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

2 Centrifugal Pumps Pump Impeller Vanes Direction of rotation

3 Centrifugal Pumps Typical single suction impeller

4 Centrifugal Pumps Single suction impeller

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

6 Centrifugal Pumps Impeller Profiles Specific Speed HI Standard

7 Centrifugal Pumps Generally: u Maximum efficiency lies in the range: 200015000

8 Centrifugal Pumps Full Diameter Impeller Rotation Impeller Blades VtVt VrVr VsVs V r = Radial Velocity V t = Tangential Velocity V s = Vector Sum Velocity

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

10 Centrifugal Pumps End Suction Pump Series sizes –To 4400 gpm –To 520 ft TDH –To 150 HP To 8”x10” –General Purpose Motor

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

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

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

14 Centrifugal Pumps Multi-stage pumps Bell & Gossett Series 3550 Bell & Gossett Series 3550 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

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

16 Centrifugal Pumps Vertical Turbine Submersible –48 Models – bowls – gpm – feet head Lineshaft –88 Models –5-20” bowls –4 Styles – ,000 gpm – feet head

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

18 Centrifugal Pumps Typical Split Case Pump- Section View

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

20 Centrifugal Pumps VSC Pump- Section View

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

22 Centrifugal Pumps Standard construction Bell & Gossett Series 1510 Standard Construction Bell & Gossett Series 1510 Standard Construction

23 Centrifugal Pumps Seals Shaft Process Fluid Leakage Environment Vessel Wall

24 Centrifugal Pumps B&G Pump Construction u Standard construction, any impeller –Mechanical seal –Internally flushed, seal cavity –Variety of seal materials

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

26 Centrifugal Pumps Seal Cavity

27 Centrifugal Pumps Standard construction Bell & Gossett Series 1510 Standard Construction Bell & Gossett Series 1510 Standard Construction

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

29 Centrifugal Pumps Internally Flushed Mechanical Seals Bell & Gossett Series HSC 3 Standard Construction Bell & Gossett Series HSC 3 Standard Construction

30 Centrifugal Pumps Pump Construction u Stuffing box construction, any impeller –External flush lines »Internal or External Fluid –Compression packing rings –Single flushed mechanical seal

31 Centrifugal Pumps Packing Shaft Process Fluid Leakage Environment Vessel Wall

32 Centrifugal Pumps Stuffing box with packing

33 Centrifugal Pumps Packing Installation

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

35 Centrifugal Pumps Liquid-Abrasives Separator

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

37 Centrifugal Pumps Angular Misalignment

38 Centrifugal Pumps Parallel or Offset Misalignment

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

40 Centrifugal Pumps Why 5 diameters? Single Suction Impeller

41 Centrifugal Pumps Installation

42 Typical installation

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

44 Centrifugal Pumps Vertical Turbine Pump Driver Discharge Head Discharge Head Column Bowl Assembly Bowl Assembly

45 Comments? Questions? Observations?


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