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Pumps. CM4120 D. Caspary February, 2004. Outline. Intro to Pumping Classifications of pumps Positive Displacement Pump – Examples and Applications Centrifugal Pumps – Examples and Applications Pump Curves. History of Pumps. First pumps were driven by water wheels or animal powered

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Pumps

CM4120

D. Caspary

February, 2004


Outline

  • Intro to Pumping

  • Classifications of pumps

  • Positive Displacement Pump – Examples and Applications

  • Centrifugal Pumps – Examples and Applications

  • Pump Curves


History of Pumps

  • First pumps were driven by water wheels or animal powered

    • Water was lifted w/ paddles and dumped at a higher elevation

    • Over 2200 years ago in Greece, Persia, the Orient , some still in use today

  • Electric motor is most common machine in use today, the pump is second most common

  • Agriculture  Automobile  Construction  Chemical Manufacturing  Household  Hydraulic Systems  Submarines  Space Station  Zeeland to Zimbabwe


Pump Applications

Used to increase the potential and/or kinetic energy state of a fluid

  • Liquid – water, chemical, fuels, coolants, refrigerants, hydraulic fluids, boiler feed, condensate return, etc.

  • Vapor/gas – foams, air, other gases

  • Slurries – concrete, quarry slurries, mud for drilling, precipitates, sewage, pulp stock, etc.


Two Primary Classifications of Pumps

  • Dynamic (or Centrifugal) – Use a spinning impeller to induce centrifugal forces, increasing pressure at the discharge side of the housing.

  • Positive Displacement – Transfers a fixed volume of fluid thru the pump housing with each cycle of operation.


Classifications of Pumps

Overwhelming majority of all pumps are some type of Centrifugal Pump.

  • Lower initial cost

  • Reduced maintenance costs

    Positive Displacement Pumps are widely used but for specific applications.


Comparison betweenPositive Displacement and Centrifugal Pumps


Head vs. Flow Comparison between Positive Displacement and Centrifugal Pumps


Effect of Increasing Viscosity on Flow for Positive Displacement and Centrifugal Pumps


Comparison of Efficiency vs. Head between Positive Displacement and Centrifugal Pumps


Positive Displacement Pump “Family Tree”


Types of PD Pumps – Gear Pumps

  • External Gear Pump

    • High speed

    • Quiet operation

    • Fuel, lubricants, hydraulic fluid power systems, metering

    • No solids

  • Internal Gear Pump

    • Non-pulsating discharge pressure

    • Low NPSHR

    • Low to moderate speed

    • High viscosity fluids


Other Common Types of PD Pumps

  • Lobe Pump

    • No metal to metal contact

    • Can handle solids without damaging them

    • Applications are found in food processing, pharmaceutical, personal care, etc.

  • Diaphragm Pump


Pumps

Positive Displacement

Centrifugal

Multi-Stage

Vertical

Single Stage

Horizontal

Open Impeller

Closed Impeller

Centrifugal Pump “Family Tree”


How a Centrifugal Pump Works

  • Pump housing must be primed

  • Impeller rotates, imparting an outward velocity to the fluid – kinetic energy

  • Fluid velocity reaches maximum at the outside diameter of the impeller

  • Fluid enters the volute where it is channeled to the discharge

  • Resistance to flow, starting at the volute, reduces velocity creating pressure energy

  • Vapor pressure of fluid causes new fluid to be drawn into the eye of the impeller


A Centrifugal Pump/Driver Installation

Discharge line

Electric Motor

Pump Housing

Coupling

Bearing Support

Suction line

External Cooling

Stuffing Box and Packing Gland


Single Stage, Horizontal Shaft, Closed ImpellerFlowserve Pump Co.


Horizontal, Split Case, Single Stage Fire PumpPatterson Pump, Div. of Gorman-Rupp


Vertical PumpsCarver Pump Co.


Horizontal, Multi-Stage Pump Cut-away


Types of Impellers

  • Closed vane

  • Open vane

  • Open vane, cut impeller


Pump Curve for a Goulds Model HSC centrifugal pump at 3500 rpm

When selecting new pump or changing capacity of existing pumps:

  • Capacity for 6 impeller sizes

  • NPSHR

  • Req’d horsepower

  • Efficiency


Pumping Affinity Laws

Used for estimating pump performance when changing impeller size or RPM

  • Q1/Q2=N1/N2

  • H1/H2=(N1/N2)2

  • P1/P2=(N1/N2)3


Pump EfficiencyOverall Efficiency

PP, Pump Input power, BHP

PW, Pump Output Power

PMOT, Driver Input Power


Pump Maintenance

  • Seals

    • Shaft packing vs. mechanical seals

    • Monitor for leaks

  • Bearings

    • Overhung vs. double support

    • Monitor vibration

  • Wetted parts corrosion

  • Cavitation

    • monitor suction-side pressure

    • listen for rattling


References

  • Viking Pump product literature

  • Gorman-Rupp product literature

  • Goulds Pump product literature

  • Flowserve product literature

  • Carver Pump product literature

  • Pump Handbook, Karassik, Krutzsch, Fraser, Messina, McGraw-Hill, 1976

  • www.pumpschool.com, Viking Pump, Feb. 2004.

  • www.engineeringtoolbox.com, The Engineering Toolbox, March 2004.


Pumping Terminology

  • Head

  • Gauge head (hg)

  • Velocity head (hv)

  • Elevation head (Z)

  • Atmospheric head (hatm)

  • Total suction head or suction lift (hs)

  • Total discharge head (hd)

  • Total head (H)

  • NPSHA

  • NPSHR


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