1. Hydraulic Engineering
Prof. Zaher Kuhail
Eng. Tamer Eshtawi

2. Lecture 12
Water Pump

3. Safety systems on pipelines to avoid (water hummer)

4. Pump Inertia
Bypass Reflex Valve
Surge Tanks

5. Discharge Tanks
Reflex Valve

6. Water Pump
Water pumps are devices designed to convert mechanical energy to hydraulic energy. They are used to move water from lower points to higher points with a required discharge and pressure head. This chapter will deal with the basic hydraulic concepts of water pumps.

7. Pump Classification Turbo-hydraulic (kinetic) pumps
Centrifugal pumps (radial-flow pumps)
Propeller pumps (axial-flow pumps)
Jet pumps (mixed-flow pumps)
Positive-displacement pumps
Screw pumps
Reciprocating pumps

8. Centrifugal pumps (radial-flow pumps)

9. Propeller pumps (axial-flow pumps)

10. Centrifugal Pump Impeller; which is the rotating part of
the centrifugal pump.
Casing; which is an air-tight passage
surrounding the impeller
Suction Pipe with a Foot-valve and a Strainer
Delivery Pipe
The Shaft
The Motor

11. Hydraulic Analysis of Pumps and Piping Systems
Case 1

12. Case 2

13. hs (static suction head): it is the difference in elevation between the suction liquid level and the centerline of the pump impeller.
hd (static discharge head): it is the difference in elevation between the discharge liquid level and the centerline of the pump impeller.
Hstat (static head): it is the difference (or sum) in elevation between the static discharge and the static suction heads, .
Hms (manometric suction head): it is the suction gage reading (if a manometer is installed just at the inlet of the pump, then Hms is the height to which the water will rise in the manometer).
Hmd (manometric discharge head): it is the discharge gage reading (if a manometer is installed just at the outlet of the pump, then Hmd is the height to which the water will rise in the manometer).
Hm (manometric head): it is the increase of pressure head generated by the pump, .
Ht (total dynamic head): it is the total head delivered by the pump:

14. Case 1
Case 2
Or From Bernoulli

15. Motor which has an the efficiency
Pump Efficiency
Which is the power input delivered from the motor to the pump
Motor which has an the efficiency
which is the power input delivered to the motor.
The overall efficiency of the motor-pump system

16. Example 1
Pump with suction pipe diameter of 100mm and delivery pipe diameter of 75mm, Q in the system is 15L/s. the manometeric suction head is 198 mm of mercury, where the manometeric discharge pressure is 0.95 bar. Motor power is 3.2 KW

17. Solution

18. Efficiency