1. Centrifugal Pump Basics Terms commonly used in the pumping industry

2. Centrifugal Pump Basics zCentrifugal, (Sen-trif’-u-gal) zTending to fly from a center zThrown from a center zCentrifugal pump impeller does just that zWater drawn into impeller eye, accelerated down the blades and thrown against pump casing that directs flow out of discharge

3. Centrifugal Pump Basics Centrifugal Pump Liquid into impeller eye from pump suction Impeller Rotation

4. Centrifugal Pump Basics Centrifugal Pump Curve

5. Centrifugal Pump Basics Centrifugal Pump Curve

6. Centrifugal Pump Basics z1 Gallon of water (U.S. @ 60DegF) weighs 8.33 lbs z1 cubic foot of water contains 7.48 gallons zSpecific 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” 1”1” Basic Fluid Facts

7. Centrifugal Pump Basics WATER 1.0 sp gr GASOLINE 0.8 sp gr BRINE 1.2 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

8. 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” 1”1” BASIC FLUID FACTS

9. Centrifugal Pump Basics Basic Centrifugal Pump Equations For variations in impeller diameter, at constant speed: D1 = Q1 = H1BHP1 = D1 3 D2 Q2 H2BHP2 D2 3 For variations in speed, with constant impeller diameter: S1 = Q1 = H1BHP1 = S1 3 S2 = Q2 H2BHP2 S2 3 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)  

10. Centrifugal Pump Basics Friction Loss for Water in Commercial Steel Pipe (Schedule 40) System Resistance

11. Centrifugal Pump Basics zA “Closed” hydronic system is one that has only one interface with air or flexible membrane zAn “Open” hydronic system is one that has more than one interface with air or a flexible membrane Open & Closed Systems

12. Centrifugal Pump Basics LOAD SOURCE EXPANSION BUILDING HEIGHT Balancing Valve 3-Way Control Valve Isolating Valve LOAD “Closed” System

13. Centrifugal Pump Basics System Resistance Curve CAPACITY Friction Losses “Closed” System Resistance Curve

14. Centrifugal Pump Basics Static Suction Head CONDENSER Static Head “Open” System

15. Centrifugal Pump Basics HEAD System Head Curve CAPACITY Friction Losses Total Static Head “Open” System Resistance Curve

16. Centrifugal Pump Basics LOAD SOURCE EXPANSION BUILDING HEIGHT BALANCING VALVE 2 WAY CONTROL VALVE ISOLATING VALVE LOAD “Closed” System with Minimum Maintained Pressure

17. Centrifugal Pump Basics HEAD System Head Curve CAPACITY Friction Losses Minimum Maintained Pressure “Closed” System Resistance Curve with Minimum Maintained Pressure

18. Centrifugal Pump Basics Terms commonly used in the pumping industry