Pump Basics (2)

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    Centrifugal Pump Basics

    Terms commonly used in theTerms commonly used in the

    pumping industrypumping industry

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    Centrifugal Pump Basics

    Centrifugal, (Sen-trif-u-gal)

    Tending to fly from a center

    Thrown from a center

    Centrifugal pump impeller does just that

    Water drawn into impeller eye, accelerateddown the blades and thrown against pump

    casing that directs flow out of discharge

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    Centrifugal Pump Basics

    Centrifugal Pump

    Liquid into

    impeller eye from

    pump suction

    Impeller Rotation

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    Centrifugal Pump Basics

    Centrifugal Pump Curve

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    Centrifugal Pump Basics

    Centrifugal Pump Curve

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    Centrifugal Pump Basics

    1 Gallon of water(U.S. @ 60DegF) weighs8.33 lbs

    1 cubic foot of watercontains 7.48 gallons

    Specific Gravity(Sp Gr) of a fluid is

    the relationship of thedensity (lbs/ft3) to that ofwater (62.3 lbs/ft3)

    WATER COLUMN

    1 psig

    2.31 ft

    1 1

    Basic Fluid Facts

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    Centrifugal Pump Basics

    WATER

    1.0 sp gr

    GASOLINE

    0.8 sp gr

    BRINE

    1.2 sp gr

    hp =gpm*hd*sp

    gr*100

    Pump head (ft) = psig*2.31sp gr

    231 ft

    120 psig80 psig100 psig

    Pump Shut-off Head 231ft

    Specific Gravity

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    Centrifugal Pump Basics

    1 inch square

    column of air, the

    height of the

    earths atmosphere

    (From Sea Level)

    weights 14.7 lbs

    Air Column 14.7 psia

    0 psig

    11

    BASIC FLUID FACTS

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    Centrifugal Pump Basics

    Basic Centrifugal Pump Equations

    For variations in impeller diameter, at constant speed:

    D1 = Q1 = H1 BHP1 = D13

    D2 Q2 H2 BHP2 D23

    For variations in speed, with constant impeller diameter:

    S1 = Q1 = H1 BHP1 = S13

    S2 = Q2 H2 BHP2 S23

    Where: D = Impeller Diameter (Ins / mm)

    H = Pump Head (Ft / m)

    Q = Pump Capacity (gpm / lps)

    S = Speed (rpm / rps)

    BHP = Brake Horsepower (Shaft Power - hp / kW)

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    Centrifugal Pump Basics

    Friction Loss for Water in Commercial Steel Pipe (Schedule 40)

    System Resistance

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    Centrifugal Pump Basics

    A Closed hydronic system is one

    that has only one interface with airor flexible membrane

    An Open hydronic system is one

    that has more than one interfacewith air or a flexible membrane

    Open & Closed Systems

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    Centrifugal Pump Basics

    LOAD

    LOAD

    LOAD

    SOURCE

    EXPANSION

    BUILDING

    HEIGHT

    BalancingValve

    3-WayControlValve

    IsolatingValve

    LOAD

    Closed System

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    Centrifugal Pump Basics

    System Resistance Curve

    CAPACITY

    FrictionLosses

    Closed System Resistance Curve

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    Centrifugal Pump Basics

    StaticSuction Head

    CONDENSER

    Static Head

    Open System

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    Centrifugal Pump Basics

    HEAD

    System Head Curve

    CAPACITY

    FrictionLosses

    TotalStaticHead

    Open System Resistance Curve

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    Centrifugal Pump Basics

    LOAD

    LOAD

    LOAD

    SOURCE

    EXPANSION

    BUILDING

    HEIGHT

    BALANCING

    VALVE

    2 WAY CONTROL

    VALVE

    ISOLATING

    VALVE

    LOAD

    Closed System with

    Minimum Maintained Pressure

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    Centrifugal Pump Basics

    HEAD

    System Head Curve

    CAPACITY

    FrictionLosses

    MinimumMaintainedPressure

    Closed System Resistance Curve with

    Minimum Maintained Pressure

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    Centrifugal Pump Basics

    Terms commonly used in theTerms commonly used in the

    pumping industrypumping industry