# pump efficiency sample problems

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• ### Pump power calculations - sample problem -

(b) What is the corresponding pump shaft power? Solution: From the pump curve at the ﬂow rate of 2780gpm, the corresponding pump shaft power is 72bhp. (c) What is the wire to water efﬁciency? Solution: From Equation 1.10: h ww ¼ ðQ h=3960Þ 0:746 P e 100 ¼ ð2780 80=3960Þ 0:746 58 100 ¼ 72:2% (d) What is the pump efﬁciency?

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• ### Example Problem Solutions - Wiley Online Library

2014-9-26 · Water Online’s “Math Solutions,” presented by wastewater consultant and trainer Dan Theobald (“Wastewater Dan”), instructs operators on pump performance and efficiency calculations. Pump performance and efficiency calculations, whether for certification exams or for operating your plant, may require various head pressure calculations, different horsepower calculations, or certain efficiency …

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• ### Math Solutions Pump Performance And Efficiency

2017-7-12 · 2.0 Centrifugal Pump Problems Typical pump problems include: • No or low flow • No or low pressure • Excessive power consumption • Excessive noise or vibration • Seal leakage These are common for all Centrifugal pump types shown as follows: Reciprocating Process General Pumps Positive Displacement Rotodynamic

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• ### Problem Solving - Centrifugal Pumps

2012-1-20 · These equations predict that a pump that produces 100 GPM at 30 feet of head and requires 1 BHP will have an overall efficiency is 75.7 percent at that flow point. An extension of the second equation also allows the computation of the BHP required at any point on a pump’s performance curve if we know its hydraulic efficiency.

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• ### Pump Efficiency—What Is Efficiency?

2014-4-24 · Flow problems, such as vortices induced by a fluid passing through obstructions, can remarkably reduce pump efficiency or even damage pump components [9, 10]. The cavitation induced by an air-entraining vortex may seriously damage the impeller fans.

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• ### Pump sizing calculations - sample problem -

2017-6-2 · The older pump now operates only in the summer. Assuming continuous operation with an efficiency (ηm) of 93% for both motors, we can calculate the energy savings from operating the smaller pump as follows: Savings = (200 hp – 50 hp)/ηmx 0.746 kW/hp x (9 months/12 months) x 8,760 hours/year = 790,520 kWh/year.

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• ### Solutions to Common Centrifugal Pump Problems |

2005-12-8 · is unaffected so at point B the efficiency is not optimal. Figure 2 WORKED EXAMPLE No. 2 If only the 125 mm pump in WE 1 is available, what speed must it be run at to obtain the required head and flow? What is the efficiency and input power to the pump? SOLUTION B is the operating point so we must calculate HC and QC 2 C 2 C 2 B C C B 0.016 119141Q Q 30.5 Q Q

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• ### Math Solutions Pump Performance And Efficiency

2014-9-26 · Some common pump performance and efficiency terms are defined, and their calculations are accessible below: Definitions and Math Solutions for various pump performance efficiency calculations. Suction Lift Head Pressure-Ft.: The distance from where the liquid is taken to the centerline of the pump. Calculate-Suction Lift Head Pressure-Ft.:

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• ### Improving Pumping System Performance - Energy

2017-6-2 · 2. Common Pumping System Problems 3. Indications of Oversized Pumps 4. Piping Configurations to Improve Pumping System Efficiency 5. Basic Pump Maintenance 6. Centrifugal Pumps 7. Positive Displacement Pump Applications 8. Multiple Pump Arrangements 9. Pony Pumps 10. Impeller Trimming 11. Controlling Pumps with Adjustable Speed Drives Section 3 ...

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• ### Checklist of Problems vvith Centrifugal Pumps and their

2017-8-25 · 23. Pump develops cavitation when the available NPSH is increased CHECKLISTS OF CAUSES OF PROBLEMS 1 Pump does not develop any head, nor does it deliver liquid Possible Causes 1. Pump not primed (not full of liquid) 2. Shaft is broken 3. Broken or disengaged connection between driver and pump 4. Impeller key broken or missing 5. No impeller in pump

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• ### FUNDAMENTALS OF FLUID MECHANICS Chapter 12

2014-5-22 · Example 12.2 Centrifugal Pump Performance Based on Inlet/Outlet Velocities zWater is pumped at the rate of 1400 gpm through a centrifugal pump operating at a speed of 1750 rpm. The impeller has a uniform blade length, b, of 2 in. with r 1 = 1.9 in. and r 2 = 7.0 in., and the exit blade angle is β=23º . Assume ideal flow conditions and that the

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• ### Second Law Problems - Michigan State University

2002-3-26 · 9. The pressure of water is increased by the use of a pump from 14 to 40 psia. A rise in the water temperature from 60°F to 60.2°F is observed. Determine the irreversibility, the second law efficiency, and the isentropic efficiency of the pump.

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• ### Basic Pump Parameters and the Affinity Laws

2020-4-10 · efficiency, and (3) drive efficiency. The overall pump operational efficiency (4) is the product of the three preceding efficiencies. A complete discussion of hydraulic efficiency will be provided when the subject of power is undertaken. In the context of this course, efficiency means hydraulic efficiency and it will be denoted with the symbol E.

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• ### Worked Example 5: Pump Requirement | ITACA

This is the general equation for calculating the pressure requirement for a pump. Combined with two other Equation (20) which gives the power that needs to be supplied to the pump (W in):. and Equation (21) which gives the electrical power required (W e):. it is possible to derive the pump specification for a series of different diameter delivery pipes, assuming a given volumetric flow rate.

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• ### (PDF) Design and Analysis of Centrifugal Pump

2018-1-31 · Problems arise, and diagnosing pump problems is a difficult and often confusing process. This paper provides some brief guidelines for determining the nature of and solution to specific pump problems.

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• ### About the PuMP Approach to Performance

The PuMP Blueprint starts us off with a self-assessment tool called the PuMP Diagnostic. It’s not really a survey, but rather a discussion tool. It helps our team understand what good measurement means and how to do it properly, avoiding the most common struggles and problems.

Get Price
• ### TUTORIAL CENTRIFUGAL PUMP SYSTEMS

2007-10-27 · examine the system to see if the pipes are too small. However all pump systems are different, in some systems the friction energy may represent 100% of the pump's energy, This is what makes pump systems interesting, there is a million and one applications for them. In household systems, friction can be a greater proportion of the pump energy

Get Price
• ### Math Solutions Pump Performance And Efficiency

2014-9-26 · Some common pump performance and efficiency terms are defined, and their calculations are accessible below: Definitions and Math Solutions for various pump performance efficiency calculations. Suction Lift Head Pressure-Ft.: The distance from where the liquid is taken to the centerline of the pump. Calculate-Suction Lift Head Pressure-Ft.:

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• ### IRRIGATION PUMP EFFICIENCY THE EVOLVING ESSENTIALS

2018-7-23 · IRRIGATION PUMP EFFICIENCY – THE EVOLVING ESSENTIALS William Green, Center for Irrigation Technology, California State University, Fresno Greg Allen, REDtrac, LLC, Bakersfield, California PUMP EFFICIENCY and ENERGY COST – THE PROBLEM About one-third of the irrigation pumps in California operate at less than 50% efficiency.

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• ### Centrifugal Pump Efficiency Calculation - Chemical ...

2016-10-27 · Centrifugal pump efficiency is the ratio of Hydraulic power delivered by the pump to the brake horsepower supplied to the pump. Hydraulic Power (Power Output from Pump): Centrifugal Pump consumes energy to develop the discharge pressure and to deliver flow. Therefore Hydraulic Horsepower of the Pump depends on these two parameters.

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• ### Second Law Problems - Michigan State University

2002-3-26 · 9. The pressure of water is increased by the use of a pump from 14 to 40 psia. A rise in the water temperature from 60°F to 60.2°F is observed. Determine the irreversibility, the second law efficiency, and the isentropic efficiency of the pump.

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• ### INVESTIGATION OF A MULTIPHASE TWIN-SCREW PUMP

2016-9-15 · there are some problems that have been encountered while operating at high GVFs. When operating at high GVF, over 95% twin-screw pumps experience a severe loss of efficiency and an increase of operating temperature. A common way to increase the efficiency while operating in the high GVF range includes adding a liquid recirculation

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• ### Worked Example 5: Pump Requirement | ITACA

This is the general equation for calculating the pressure requirement for a pump. Combined with two other Equation (20) which gives the power that needs to be supplied to the pump (W in):. and Equation (21) which gives the electrical power required (W e):. it is possible to derive the pump specification for a series of different diameter delivery pipes, assuming a given volumetric flow rate.

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• ### Thermodynamics eBook: Isentropic Efficiency

Compressors and pumps, when undergo a steady-flow process, consume power. The isentropic efficiency of a compressor or pump is defined as the ratio of the work input to an isentropic process, to the work input to the actual process between the same inlet and exit pressures. η C = Isentropic compressor (pump) work/Actual compressor (pump) work

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• ### Experiment 9: Centrifugal Pump - Islamic University of Gaza

2013-4-25 · stabilise then recording the sensor and pump data each time. Create a new results sheet by selecting the icon (you may also wish to save the results at this time to avoid losing the data in the event of problems). Close the gate valve. Set the pump to 60%. Select the icon to record the sensor readings and pump settings on the new results table.

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• ### Heat Pump Efficiency - Save Money With High

2017-6-17 · Heat Pump Efficiency For Pools. Heat pumps are greatly appreciated for many benefits: among such benefits are heat pump efficiency factors. High efficiency heat pumps utilize special, integrated ventilation systems to draw heat from the ambient air surrounding the heat pump device.

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• ### Centrifugal Pumps : Principles, Operation And Design

Best online course about centrifugal pumps. The instructor explains all the main components of a centrifugal pump clearly and the best part is explaining along with practical problems. Thus, ensuring that the viewer has a good grasp over the topic. Upon that the course material is really great and worth considering your time.

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• ### Math Solutions Pump Performance And Efficiency

2014-9-26 · Some common pump performance and efficiency terms are defined, and their calculations are accessible below: Definitions and Math Solutions for various pump performance efficiency calculations. Suction Lift Head Pressure-Ft.: The distance from where the liquid is taken to the centerline of the pump. Calculate-Suction Lift Head Pressure-Ft.:

Get Price
• ### Improving Pumping System Performance - Energy

2017-6-2 · 2. Common Pumping System Problems 3. Indications of Oversized Pumps 4. Piping Configurations to Improve Pumping System Efficiency 5. Basic Pump Maintenance 6. Centrifugal Pumps 7. Positive Displacement Pump Applications 8. Multiple Pump Arrangements 9. Pony Pumps 10. Impeller Trimming 11. Controlling Pumps with Adjustable Speed Drives Section 3 ...

Get Price
• ### Checklist of Problems vvith Centrifugal Pumps and their

2017-8-25 · 23. Pump develops cavitation when the available NPSH is increased CHECKLISTS OF CAUSES OF PROBLEMS 1 Pump does not develop any head, nor does it deliver liquid Possible Causes 1. Pump not primed (not full of liquid) 2. Shaft is broken 3. Broken or disengaged connection between driver and pump 4. Impeller key broken or missing 5. No impeller in pump

Get Price
• ### FUNDAMENTALS OF FLUID MECHANICS Chapter 12

2014-5-22 · Example 12.2 Centrifugal Pump Performance Based on Inlet/Outlet Velocities zWater is pumped at the rate of 1400 gpm through a centrifugal pump operating at a speed of 1750 rpm. The impeller has a uniform blade length, b, of 2 in. with r 1 = 1.9 in. and r 2 = 7.0 in., and the exit blade angle is β=23º . Assume ideal flow conditions and that the

Get Price
• ### Second Law Problems - Michigan State University

2002-3-26 · 9. The pressure of water is increased by the use of a pump from 14 to 40 psia. A rise in the water temperature from 60°F to 60.2°F is observed. Determine the irreversibility, the second law efficiency, and the isentropic efficiency of the pump.

Get Price
• ### Basic Pump Parameters and the Affinity Laws

2020-4-10 · efficiency, and (3) drive efficiency. The overall pump operational efficiency (4) is the product of the three preceding efficiencies. A complete discussion of hydraulic efficiency will be provided when the subject of power is undertaken. In the context of this course, efficiency means hydraulic efficiency and it will be denoted with the symbol E.

Get Price
• ### Worked Example 5: Pump Requirement | ITACA

This is the general equation for calculating the pressure requirement for a pump. Combined with two other Equation (20) which gives the power that needs to be supplied to the pump (W in):. and Equation (21) which gives the electrical power required (W e):. it is possible to derive the pump specification for a series of different diameter delivery pipes, assuming a given volumetric flow rate.

Get Price
• ### (PDF) Design and Analysis of Centrifugal Pump

2018-1-31 · Problems arise, and diagnosing pump problems is a difficult and often confusing process. This paper provides some brief guidelines for determining the nature of and solution to specific pump problems.

Get Price
• ### About the PuMP Approach to Performance

The PuMP Blueprint starts us off with a self-assessment tool called the PuMP Diagnostic. It’s not really a survey, but rather a discussion tool. It helps our team understand what good measurement means and how to do it properly, avoiding the most common struggles and problems.

Get Price
• ### TUTORIAL CENTRIFUGAL PUMP SYSTEMS

2007-10-27 · examine the system to see if the pipes are too small. However all pump systems are different, in some systems the friction energy may represent 100% of the pump's energy, This is what makes pump systems interesting, there is a million and one applications for them. In household systems, friction can be a greater proportion of the pump energy

Get Price
• ### Example 9B - 1: Ideal Rankine Cycle Efficiency as a ...

Construct plots of the net power output of the cycle and the thermodynamic efficiency as functions of the operating pressure of the condenser.Consider condenser pressures from 10 kPa to 200 kPa.: Data: P 1 = 10 MPa, T 2 = 550 o C, m = 75 kg/s Read : The key is that the cycle is an ideal Rankine Cycle. This means that the pump and turbine operate isentropically and that the condenser effluent ...

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• ### Solved: To measure the efficiency of a pump, the ...

To measure the efficiency of a pump, the parameters in the following formula are usually measured and applied: η = QΔP/W. In this formula, η is the pump’s efficiency, Q is the volumetric flow rate of the pump, Δ P is the pressure differential between the inlet outlet of the pump, and W is the power input into the pump. The following equipment is used:

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• ### Irrigation System Evaluation and Pump Efficiency

2020-10-13 · Research for the project encompasses drip irrigation systems, irrigation pump efficiency, irrigation management, well reclamation techniques and pistachio water requirements. A Distribution Uniformity evaluation was performed to understand how sand has affected the system. I consulted local growers in the area to discover how sand problems have

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• ### Improvement of the Efficiency of the Axial-Flow Pump

2016-2-4 · The impeller has 3 blades and the outlet guide vane has 5 blades. The rotating speed is 1450 r/min. The average tip clearance of impeller is 0.2 mm at blade angle , which are the same as those of the experimental model.The computational domain is the flow passage from the inlet to outlet, including the inlet passage, outlet passage, impeller, and guide vane.

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• ### Pump Power Calculation Formula | Specific speed of a ...

2018-9-22 · Pump Efficiency is the most important factor while calculating power consumption. So while selection of the higher rating of pump always choose best efficiency pump set. The following formula to help which type of efficiency rating pump is best. N . N = Number units power saving per year in KWH = Higher and lower overall efficiency of two pump ...

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• ### Troubleshooting Common System Problems Using

2015-7-20 · Troubleshooting Common System Problems Using Waters Neutrals Quality Control Reference Material 5 When a minor leak was present in the pump, all of the peaks were still eluting within the sample run time; however, there is a shift in retention times and a slight change in the system pressure. With stringent

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• ### RP Photonics Encyclopedia - pump absorption,

Encyclopedia > letter P > pump absorption. Pump Absorption Calculation of Pump Absorption. For the optimization of pump absorption in lasers and amplifiers, one can use a numerical software such as RP Fiber Power.It can also simulate the effects of excessively strong pump absorption.. Definition: the absorption of pump light, e.g. in a laser or a laser amplifier

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• ### Reciprocating Pumps - an overview | ScienceDirect

The efficiency of a centrifugal pump drops rapidly with increasing viscosity. The most economical applications of these pumps are normally limited to viscosities under about 110 cSt (500 SSU). Reciprocating pumps can efficiently handle stocks up to about 1760 cSt (8000 SSU).

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• ### Q & A: Calculating Efficiency | Department of Physics ...

2007-10-22 · For example, the 'efficiency' of an air conditioner is often taken to mean the ratio of the energy it pumps out of a room to the energy it draws from the electrical outlet. A good result for that might be, for example '4.3' That would mean that paying for 1 Joule of electrical energy is enough to pump 4.3 Joules of heat out of your house.

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• ### PREMIUM EFFICIENCY MOTOR SELECTION AND

2017-6-3 · PREMIUM EFFICIENCY MOTOR SELECTION AND APPLICATION GUIDE | i ACKNOWLEDGMENTS The Premium Efficiency Motor Selection and Application Guide and its companion publication, Continuous Energy Improvement in Motor-Driven Systems, have been developed by the U.S. Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy (EERE) …

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