Centrifugal Pump Basics
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Transcript of Centrifugal Pump Basics
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Centrifugal Pump Basics
Terms commonly used in the Terms 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, accelerated down 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 frompump 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) weighs 8.33 lbs
1 cubic foot of water contains 7.48 gallons
Specific Gravity (Sp Gr) of a fluid is the relationship of the density (lbs/ft3) to that of water (62.3 lbs/ft3)
WATER COLUMN
1 psig
2.31 ft
1” 1”
Basic Fluid Facts
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Centrifugal Pump Basics
WATER1.0 sp gr
GASOLINE0.8 sp gr
BRINE1.2 sp gr
hp = gpm*hd*sp gr*100 3960*Pump Eff
Pump head (ft) = psig*2.31 sp 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 earth’s atmosphere (From Sea Level) weights 14.7 lbs
Air Column 14.7 psia
0 psig
1”1”
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 air or flexible membrane
An “Open” hydronic system is one that has more than one interface with air or a flexible membrane
Open & Closed Systems
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Centrifugal Pump Basics
LOAD
LOAD
LOAD
SOURCE
EXPANSION
BUILDINGHEIGHT
BalancingValve
3-Way Control Valve
Isolating Valve
LOAD
“Closed” System
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Centrifugal Pump Basics
System Resistance Curve
CAPACITY
Friction Losses
“Closed” System Resistance Curve
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Centrifugal Pump Basics
Static Suction Head
CONDENSER
Static Head
“Open” System
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Centrifugal Pump Basics
HE
AD
System Head Curve
CAPACITY
Friction Losses
Total Static Head
“Open” System Resistance Curve
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Centrifugal Pump Basics
LOAD
LOAD
LOAD
SOURCE
EXPANSION
BUILDINGHEIGHT
BALANCINGVALVE
2 WAY CONTROL VALVE
ISOLATINGVALVE
LOAD
“Closed” System with Minimum Maintained Pressure
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Centrifugal Pump Basics
HE
AD
System Head Curve
CAPACITY
Friction Losses
MinimumMaintainedPressure
“Closed” System Resistance Curve with Minimum Maintained Pressure
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Centrifugal Pump Basics
Terms commonly used in the Terms commonly used in the pumping industrypumping industry