SAMPLE SLIDES OF THE 1-DAY SEMINAR FOR PUMP USERS

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SAMPLE SLIDES OF THE 1-DAY SEMINAR FOR PUMP USERS
As you will notice there are few words on these
slides, your trainer will provide you with his
experience which will make these images come
alive providing you with the opportunity to
reflect and ask questions, the more the
better. All of the presentation slides are
available in a binder supplied with the seminar.
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Pump systems
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A BRIEF HISTORY
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Pressure is independent of the shape of the
reservoirs
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Low pressure helps to suspend the fluid
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A pump system acts as a reverse siphon
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Demo for low pressure at the high point of a
piping system
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The energy required of the pump
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Specific energy or head
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The total head or total specific energy required
of the pump
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Pump performance curves
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Vapor pressure
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Experiment to boil water at room temperature
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Operating principle of a centrifugal pump
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Section of a centrifugal pump
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Performance curves
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NPSH depends on
The elevation of the surface of the suction
tank The pressure in the suction tank The
friction loss in the suction line The vapor
pressure of the fluid at the operating temperature
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Selecting the right impeller diameter
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Measurements on demo system
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3. Evaluate these situations in terms of good,
medium or poor?
Ans _____
Ans _____
Ans _____
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4. Give your opinion on the piping layout at the
pump suction in terms of good, medium or poor?
Ans _____
Ans _____
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SOLUTION TO THE ELBOW TOO CLOSE TO THE PUMP
SUCTION PROBLEM
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USING AN EXCENTRIC ELBOW
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Pumps in parallel - Instability
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Minimum submergence of the pump suction piping
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The effect of air (or gas) entrainment in the
pump suction
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Causes and problems associated with pump systems
Excessive vibration causing damage to the
impeller due to - cavitation
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Causes and problems associated with pump systems
NPSH or low pressure at the inlet
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Opportunities with higher return
Opportunities in electrical energy reduction Possible decrease in electrical consumption 1 Winning conditions
1. Replace a standard motor with a high efficiency motor Replace a standard efficiency motor with one that meets or surpasses the NEMA Premium standard Typically 1.5 to 5 and as much as 8 When the motors are defective or at the end of their useful life or when a motor must be replaced to accommodate a VFD.
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High efficiency motors
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Opportunities with higher return
Opportunities in electrical energy reduction Possible decrease in electrical consumption 1 Winning conditions
2. Install a variable frequency drive (VFD) A VFD can adjust the speed of a motor in response to a variable demand avoiding the throttling of control valves or the opening of recirculation control valves and the energy losses incurred. Typically 12 to 15 and as much as 27 Ideal solution when the flow varies between 40 and 60