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

Pump Impeller Direction of rotation Vanes Centrifugal Pumps

Typical single suction impeller Centrifugal Pumps

Single suction impeller Centrifugal Pumps

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

Impeller Profiles Specific Speed HI Standard Centrifugal Pumps

Generally: Maximum efficiency lies in the range: 2000<NS<3000 High head, low capacity pumps: 500<NS<1000 Low head, large capacity pumps: NS>15000 Centrifugal Pumps

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

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

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

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

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

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

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

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

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

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

Typical Split Case Pump- Section View Centrifugal Pumps

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

VSC Pump- Section View Centrifugal Pumps

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

Standard construction Bell & Gossett Series 1510 Standard Construction Centrifugal Pumps

Seals Vessel Environment Wall Shaft Process Fluid Leakage Centrifugal Pumps

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

Secondary Seal (Seal Bellows) 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

Seal Cavity Self-flushing mechanical seals were first introduced to the HVAC market by Bell & Gossett. This feature maximizes seal face lubrication, heat dissipation, and debris removal without vulnerable, external flushing lines. The internal flushing action passes two and a half to three times the liquid over the seal faces compared to externally flushed stuffing box configurations. Centrifugal Pumps

Standard construction Bell & Gossett Series 1510 Standard Construction Centrifugal Pumps

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

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

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

Packing Environment Vessel Wall Shaft Process Fluid Leakage Centrifugal Pumps

Stuffing box with packing Centrifugal Pumps

Packing Installation Centrifugal Pumps

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

Liquid-Abrasives Separator Centrifugal Pumps

What’s “suitable”…? Impeller Volutes 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

Angular Misalignment Centrifugal Pumps

Parallel or Offset Misalignment Centrifugal Pumps

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

Why 5 diameters? Single Suction Impeller Centrifugal Pumps

Installation The NPT or flanged is rated for 175 MWP. The Grooved Pump end to Grooved System Suction Diffusers have a maximum working pressure of 300 psi. The maximum temperature is 250°F. Centrifugal Pumps

Typical installation BELL & GOSSETT LEADS THE SUCTION DIFFUSER MARKET WITH THE MOST COMPLETE LINE OFFERED TODAY WE LEAD THE MARKET DUE TO OUR COMPETITIVE PRICING AND OUR SUPERIOR DESIGN WHICH HAS SET THE INDUSTRY STANDARD IT IS A PRODUCT THAT HELPS SIMPLIFY THE DESIGN, INSTALLATION, AND MAINTENANCE OF AN HVAC SYSTEM IT’S AN ACCESSORY THAT SHOULD BE QUOTED WITH EVERY PUMP

Flow Elbow Support Solid Base Foundation Pump Motor Hoist Beam Trolley with Manual Hook-Type Hoist Flow Triple Duty Valve While smaller inline pumps do provide additional installation flexibility, larger inline pumps require very special consideration due to there size, weight and unique servicing needs. These units must be mounted at floor level to allow for service access and inspection. In addition, the weight of the major components is significant and floor mounting is critical to provide servicing capability. In addition, the dimensional foot print on larger inline pumps is substantially larger then a hydraulically equivalent vertical split case pump. In tight space conditions the floor space necessary for a larger inline pump is going to exceed that of a typical vertical split case double suction pump. For example…... Suction Diffuser Elbow Support (Anchor to Base) Solid Base Foundation

Vertical Turbine Pump Driver Discharge Head Column Bowl Assembly Centrifugal Pumps

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