# pump efficiency change with pressure

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• ### Pump Efficiency—What Is Efficiency?

2012-1-20 · Editor's Note: This is the first in a six-part series on centrifugal pump efficiency. For other articles in this series, click Centrifugal Pump Efficiency series.. In this multi-part series, we will investigate several aspects of centrifugal pump efficiency.First, I will define efficiency and give some examples.

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• ### Pump Performance - an overview | ScienceDirect Topics

Pump efficiency is expressed as pump power output divided by the pump power input, so the overall pump efficiency can be finally computed from the relationship: (7.3) η = ρgQH Tω × 100 % The pump head is a term derived from the Bernoulli formulation, an energy balance around the pump.

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• ### Pressure Changers - Jordan University of Science and ...

2013-2-13 · shows the power requirement and pump efficiency of the pump as a function of flow rate. At a certain flow rate, the pump efficiency will be a maximum, and this will be referred to as the best efficiency point (B.E.P). This point represents the ideal combination of flow rate and heat at which the pump can be operated. In other words,

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• ### Pump ED 101

2016-11-12 · under high pressure, is injected directly into the cylinder at the top of the compression stroke. ... also affect pump efficiency, but the impeller and volute have the greatest influence. Lets start our investigation of centrifugal pump efficiency with the impeller. ... the speed or diameter change ‐ ‐ double the speed or diameter and flow ...

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• ### Pressure changer - processdesign

2016-2-21 · Characteristic Pump Curve Example . Another important consideration for pumps is that a Net Positive Suction Head must be maintained within the pump, in order to avoid cavitation.Cavitation occurs because as fluid enters a pump, frictional losses near the pump entrance cause a pressure drop, leading to a minimum pressure somewhere in the pump, and if the fluid is close to saturation, bubbles ...

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• ### How to Read a Pump Curve: Complete Guide

2020-11-17 · For example, while the middle of the pump efficiency curve is generally where a pump is operating at maximum efficiency in terms of pressure and flow rate, moving right on the curve above shows an increase in horsepower needed to maintain a flow rate as head increases. For example, 2 hp is required for a flow rate of 40 gpm with 80 feet of head ...

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• ### Pump Speed - an overview | ScienceDirect Topics

Increasing the pump speed results in a higher flow, as more blood gets propelled through the device. The pressure gradient across the pump is the difference between outlet and inlet pressures—i.e., that between the aortic root and the LV, with a large pressure difference resulting in decreased flow and vice versa (Fig. 17.2).

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• ### Pump cavitation and how to avoid it - Xylem US

2017-7-12 · the minimum pressure is clearly lower than the vapor pressure (20°C) near position 2, which means that cavitation will be induced. Note that in reality when the static pressure reaches vapor pressure it is not reduced further. Figure 4: Pump head, power and efficiency curves with three defined flow regions: recirculation, part load and over load.

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• ### Impeller Alterations for Better Performance | Pumps &

2020-8-17 · The affinity laws indicate the influence on volume, capacity, head (pressure) and power consumption of a pump where a change in speed of the impeller (revolutions per minute [rpm]) or change in impeller diameter are involved. Note that both a change in diameter or speed have the same relationship to pump capacity.

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• ### Pump Efficiency - uaex.edu

2014-4-16 · Pump Efficiency Pump efficiency is defined as the ratio of water horsepower output from the pump to the shaft horsepower input for the pump. Water horsepower is determined by the flow rate and pressure delivered from the pump. The shaft horsepower is delivered to the pump from the power unit, which usually is an electric motor or internal ...

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• ### Pressure Changers - Jordan University of Science and ...

2013-2-13 · shows the power requirement and pump efficiency of the pump as a function of flow rate. At a certain flow rate, the pump efficiency will be a maximum, and this will be referred to as the best efficiency point (B.E.P). This point represents the ideal combination of flow rate and heat at which the pump can be operated. In other words,

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• ### Mapping of Pump Efficiency on the Pressure‐Flow

1997-8-1 · Abstract: Because pump efficiency is closely related to heat generation and blood trauma in a centrifugal blood pump, it is quite important to study pump efficiencies in a variety of conditions. In the present study, pump efficiencies were mapped on the pressure head‐flow rate curves of 4 different pumps; Bio Medicus Bio Pump (BP‐80), Nikkiso (NK), Gyro C1E3, and Gyro PI601 (diameter of ...

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• ### (PDF) Efficiency testing of pump and motor - lab | Mel ...

Efficiency testing of pump and motor - lab. ... This pressure has to be high enough to overcome the resistance of the system, which is also called 'head'. The total head is the sum of the static head and the friction head. In many pumping applications, the flow requirement is less than the design value. ... change with varying rotational speeds ...

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• ### BASIC HYDRAULICS AND PUMP PERFORMANCE

2019-8-12 · Calculating pump efficiency Pump efficiency: Here: • Q is the flow in cubic meters per hour (m3/h) • H is the pump head, or pressure, in meters (m) • P 1 is the motor power consumption in kilowatts (kW) Note: This formula calculates both motor and pump-end efficiency as one total number. It is also called wire-to-water efficiency as it ...

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• ### Performance enhancement of centrifugal pump by

2020-1-22 · Surface roughness of casing does not affect flow field inside impeller zone considerably, but it affects pump performance by increasing pressure drop at surface which ultimately results in efficiency drop. 3. Change in surface roughness from 100 to 300 μm results in head difference of 1.53–2.15 m of water for different mass flow rate values. 4.

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• ### Centrifugal Pump Efficiency — Specific Speed | Pumps

2012-2-22 · Pump efficiency also increases with pump rotational speed, especially high speeds. The increase is not as pronounced at 3,600 rpm and below. Specific speed also affects head-capacity curve shape. Low specific speeds (500 to 1,500) produce flat curves. High …

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• ### How to improve efficiency of liquid ring vacuum

2021-5-6 · Therefore, the liquid ring pump relies on the rotation of blades and the separation of water flow to change the volume of the pump body so as to achieve the functions of suction, compression and displacement, so it belongs to the variable volume vacuum pump. 2. Liquid ring vacuum pump of analysis of factors influencing the operation efficiency

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• ### Centrifugal Pumps - Engineering ToolBox

2021-5-7 · At this point, the pump may be said to have reached its 'shut-off' head pressure. In the flow curve chart for a pump the 'shut-off head' is the point on the graph where the flow rate is zero; Pump Efficiency. Pump efficiency, η (%) is a measure of the efficiency with which the pump transfers useful work to the fluid. η = P out P in (2) where

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• ### Pump cavitation and how to avoid it - Xylem US

2017-7-12 · the minimum pressure is clearly lower than the vapor pressure (20°C) near position 2, which means that cavitation will be induced. Note that in reality when the static pressure reaches vapor pressure it is not reduced further. Figure 4: Pump head, power and efficiency curves with three defined flow regions: recirculation, part load and over load.

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• ### Mapping of Pump Efficiency on the Pressure‐Flow

1997-8-1 · Abstract: Because pump efficiency is closely related to heat generation and blood trauma in a centrifugal blood pump, it is quite important to study pump efficiencies in a variety of conditions. In the present study, pump efficiencies were mapped on the pressure head‐flow rate curves of 4 different pumps; Bio Medicus Bio Pump (BP‐80), Nikkiso (NK), Gyro C1E3, and Gyro PI601 (diameter of ...

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• ### Determining the efficiency of your pump - Global

2021-5-12 · Determining your pump efficiency . In order to calculate the pump efficiency, you could use the following formula: Q = flow in cubic meters per hour (m 3 /h) H = pump head, or pressure, in meters (m) P 1 = motor power consumption in kilowatts (kW) This formula is appropriate for both motor and pump-end efficiency as one total number.

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• ### Know How to Calculate Hydraulic Pump Efficiency?

2020-4-9 · Mechanical efficiency compares the actual torque required to drive the pump and its theoretical torque. Mechanical/hydraulic efficiency = (theoretical torque actual torque) X 100. If mechanical efficiency is 100% it would mean the hydraulic pump requires no torque to deliver flow at zero pressure.

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• ### How To Calculate Hydraulic Pump and Motor

2015-2-2 · Overall efficiency is simply the product of volumetric and mechanical/hydraulic efficiency. So continuing with the above example, the overall efficiency of the pump is 0.9 x 0.91 x 100 = 82%. Overall efficiency is used to calculate the drive power required by a pump at a given flow and pressure.

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• ### Centrifugal Pump Efficiency — Specific Speed | Pumps

2012-2-22 · Pump efficiency also increases with pump rotational speed, especially high speeds. The increase is not as pronounced at 3,600 rpm and below. Specific speed also affects head-capacity curve shape. Low specific speeds (500 to 1,500) produce flat curves. High …

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• ### How to read and use Pump Performance Curves -

This differential head should then be used along with the changed liquid density to determine the differential pressure across the pump. Pump Efficiency. As indicated in the sample pump performance curve above, the plot of pump efficiency against volumetric flow rate is also commonly reported on the pump performance curves.

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• ### How to improve efficiency of liquid ring vacuum

2021-5-6 · Therefore, the liquid ring pump relies on the rotation of blades and the separation of water flow to change the volume of the pump body so as to achieve the functions of suction, compression and displacement, so it belongs to the variable volume vacuum pump. 2. Liquid ring vacuum pump of analysis of factors influencing the operation efficiency

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• ### BASIC HYDRAULICS AND PUMP PERFORMANCE

2019-8-12 · Calculating pump efficiency Pump efficiency: Here: • Q is the flow in cubic meters per hour (m3/h) • H is the pump head, or pressure, in meters (m) • P 1 is the motor power consumption in kilowatts (kW) Note: This formula calculates both motor and pump-end efficiency as one total number. It is also called wire-to-water efficiency as it ...

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• ### Variable-Speed Pump Efficiency Calculation For Fluid

2020-6-1 · @article{osti_1649114, title = {Variable-Speed Pump Efficiency Calculation For Fluid Flow Systems with and without Static Head}, author = {Guo, Wei and Perera, Josage Chathura and Cox, Daryl and Nimbalkar, Sachin U. and Wenning, Thomas and Thirumaran, Kiran and Levine, Eli}, abstractNote = {To accurately calculate pump energy savings gained from implementing variable frequency drive …

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• ### How to Improve Pump Efficiency through CFD

In addition to qualitative information, CFD-Post can read expressions created in CFX-Pre and utilize them to provide quantitative estimates for pump efficiency, pump head and pump power from the converged simulation. The predictions from CFD yielded pump efficiency of 85.5% versus a test prediction of 85.7%.

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• ### Mapping of Pump Efficiency on the Pressure‐Flow

1997-8-1 · Abstract: Because pump efficiency is closely related to heat generation and blood trauma in a centrifugal blood pump, it is quite important to study pump efficiencies in a variety of conditions. In the present study, pump efficiencies were mapped on the pressure head‐flow rate curves of 4 different pumps; Bio Medicus Bio Pump (BP‐80), Nikkiso (NK), Gyro C1E3, and Gyro PI601 (diameter of ...

Get Price
• ### How To Calculate Hydraulic Pump and Motor

2015-2-2 · Overall efficiency is simply the product of volumetric and mechanical/hydraulic efficiency. So continuing with the above example, the overall efficiency of the pump is 0.9 x 0.91 x 100 = 82%. Overall efficiency is used to calculate the drive power required by a pump at a given flow and pressure.

Get Price
• ### Determining the efficiency of your pump - Global

2021-5-12 · Determining your pump efficiency . In order to calculate the pump efficiency, you could use the following formula: Q = flow in cubic meters per hour (m 3 /h) H = pump head, or pressure, in meters (m) P 1 = motor power consumption in kilowatts (kW) This formula is appropriate for both motor and pump-end efficiency as one total number.

Get Price
• ### How to read and use Pump Performance Curves -

This differential head should then be used along with the changed liquid density to determine the differential pressure across the pump. Pump Efficiency. As indicated in the sample pump performance curve above, the plot of pump efficiency against volumetric flow rate is also commonly reported on the pump performance curves.

Get Price
• ### Pump School: When to use a positive displacement

2017-11-27 · The volumetric efficiency of positive displacement pumps increases with increased viscosity. The pumps behave very differently when considering mechanical efficiency as well. By looking at the efficiency chart (Figure 3) you can see the impact of pressure changes on the pump’s efficiency. Changes in pressure have little effect on the PD pump ...

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• ### When to use a Positive Displacement Pump

2020-1-16 · the pump causing a higher volumetric efficiency. Remember, this chart shows effect of viscosity on the pump flow; when there is a viscosity change there is also greater lin loss in the system. This means you will also have to calculate the change in pump flow from the first chart for this pressure change. Flow Rate 40% 50% 60% 80% 90% 100% 0 ...

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• ### Variable-Speed Pump Efficiency Calculation For Fluid

2020-6-1 · @article{osti_1649114, title = {Variable-Speed Pump Efficiency Calculation For Fluid Flow Systems with and without Static Head}, author = {Guo, Wei and Perera, Josage Chathura and Cox, Daryl and Nimbalkar, Sachin U. and Wenning, Thomas and Thirumaran, Kiran and Levine, Eli}, abstractNote = {To accurately calculate pump energy savings gained from implementing variable frequency drive …

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• ### 6. PUMPS AND PUMPING SYSTEM - Bureau of Energy

2017-9-8 · increasing pressure, the less it will pump. For these reasons it is important to select a centrifu-gal pump that is designed to do a particular job. Since the pump is a dynamic device, it is convenient to consider the pressure in terms of head i.e. meters of liquid column. The pump generates the same head of liquid whatever the

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• ### Pump Power Calculation | Neutrium

2020-7-25 · Power is consumed by a pump, fan or compressor in order to move and increase the pressure of a fluid. The power requirement of the pump depends on a number of factors including the pump and motor efficiency, the differential pressure and the fluid density, viscosity and flow rate. This article provides relationships to determine the required pump power.

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• ### Centrifugal Pump Performance Test Procedures and

2021-1-1 · Pump efficiency is shown plotted against the flow as in the below figure. In most cases, the efficiency guarantee will be specified at the pump rated flow rate (q). Step 3. Vibration measurements. At each performance test point (except shutoff point) pump bearing housing vibrations will be …

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• ### Mapping of Pump Efficiency on the Pressure‐Flow

1997-8-1 · Abstract: Because pump efficiency is closely related to heat generation and blood trauma in a centrifugal blood pump, it is quite important to study pump efficiencies in a variety of conditions. In the present study, pump efficiencies were mapped on the pressure head‐flow rate curves of 4 different pumps; Bio Medicus Bio Pump (BP‐80), Nikkiso (NK), Gyro C1E3, and Gyro PI601 (diameter of ...

Get Price
• ### High Pressure Pump Efficiency Determination from ...

Utilising temperature and pressure readings taken at pump suction and at pump discharge for the accurate determination of high-pressure pump efficiency. The method outlined can be applied to any high-pressure pumping system or pump where the efficiency is required to be determined but where accurate measurement of the mass flow rate and power input is not possible or readily available.

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• ### Determining the efficiency of your pump - Global

2021-5-12 · Determining your pump efficiency . In order to calculate the pump efficiency, you could use the following formula: Q = flow in cubic meters per hour (m 3 /h) H = pump head, or pressure, in meters (m) P 1 = motor power consumption in kilowatts (kW) This formula is appropriate for both motor and pump-end efficiency as one total number.

Get Price
• ### Know How to Calculate Hydraulic Pump Efficiency?

2020-4-9 · Mechanical efficiency compares the actual torque required to drive the pump and its theoretical torque. Mechanical/hydraulic efficiency = (theoretical torque actual torque) X 100. If mechanical efficiency is 100% it would mean the hydraulic pump requires no torque to deliver flow at zero pressure.

Get Price
• ### Multi-stage pumps can deliver efficiency gains

When a pump has a flat curve as shown in Figure 2, a relatively small change in pressure produces a large change in flow, making control via pressure difficult, and limiting the amount of speed reduction available. The Affinity Laws state that the horsepower drawn by a pump varies by the cube of the difference of the speed.

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• ### Pump School: When to use a positive displacement

2017-11-27 · The volumetric efficiency of positive displacement pumps increases with increased viscosity. The pumps behave very differently when considering mechanical efficiency as well. By looking at the efficiency chart (Figure 3) you can see the impact of pressure changes on the pump’s efficiency. Changes in pressure have little effect on the PD pump ...

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• ### Experiment (9): Centrifugal pump Introduction

2014-1-7 · = Change in pressure head + change in velocity head + change in elevation = H s + H v + H e Where: H s = Change in pressure head = Where P in is the fluid pressure at inlet in Pa and P out ... The efficiency of the pump may be calculated as : Where Q is the volume flow rate in 3m /s, and P m

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• ### Understanding Centrifugal Pump Curves - M.G. Newell

2017-7-5 · The pump performance curve also provides efficiency curves. These efficiency curves intersect with the head-flow curves and are labeled with percentages. The efficiency varies throughout the operating range. In our same example with the 7.9” impeller, we can see that at 140 gallons per minute, the pump is operating at 72% efficiency.

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• ### Centrifugal Pump Performance Test Procedures and

2021-1-1 · Pump efficiency is shown plotted against the flow as in the below figure. In most cases, the efficiency guarantee will be specified at the pump rated flow rate (q). Step 3. Vibration measurements. At each performance test point (except shutoff point) pump bearing housing vibrations will be …

Get Price
• ### Know How to Calculate Hydraulic Pump Efficiency?

2020-4-9 · Mechanical efficiency compares the actual torque required to drive the pump and its theoretical torque. Mechanical/hydraulic efficiency = (theoretical torque actual torque) X 100. If mechanical efficiency is 100% it would mean the hydraulic pump requires no torque to deliver flow at zero pressure.

Get Price
• ### Pump efficiency calculation and application

2021-2-26 · 4. Volumetric efficiency calculation. Pumps are bringing liquid from the inlet of the pump, to the outlet of the pump, however, as the pressure at the outlet is higher than the inlet, the fluid tends to go back in the reverse direction, leading to 'leakages' in the volute of the pump.

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• ### Energy-efficient pressure regulation model and

2021-4-28 · Download Citation | Energy-efficient pressure regulation model and experiment of lift pump system in deepwater dual-gradient drilling | In order to improve the high-efficiency conversion between ...

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• ### Scroll Compressor and Vacuum Pump Efficiency | Air

2015-10-6 · These motor speed controllers tend to have an efficiency on the order of 95%. Conclusions. As a rough estimate, we can say that the mechanical efficiency is typically on the order of 90%, the leakage loss (and pressure drop) efficiency is on the order of 90%, and the motor efficiency …

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• ### How to improve pump energy efficiency - World Pumps

2016-2-25 · Richard Smith of AESSEAL writes:. Engineers that specify an appropriate mechanical sealing system on their pumps can significantly improve the energy efficiency of a manufacturing plant as it is estimated that around 10 % of electrical power is used for pumping equipment [1]. Unsurprisingly, regulatory bodies and engineers are focussed on improving the energy efficiency of pumps and …

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• ### How to Improve Pump Efficiency through CFD

In addition to qualitative information, CFD-Post can read expressions created in CFX-Pre and utilize them to provide quantitative estimates for pump efficiency, pump head and pump power from the converged simulation. The predictions from CFD yielded pump efficiency of 85.5% versus a test prediction of 85.7%.

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• ### Heat pump efficiency calculations - Compressor

2021-4-24 · Subcooling temperature for the heat pump Δ tsc = 5 deg C adiabatic coefficient: k = 1.16 vaporising pressure: pv =t(tv) =paspiration =4bar condensing pressure: pc = t(tc) = pdischarge =17bar vapor density: ρv=17.0 kg/m 3 specific volume for aspiration vaspiration = 1/ρv = 1/17kg/m 3 = 0.058823529 m 3 /kg internal compressor efficiency: ηi=0.84

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• ### Pump - 3D Plant - 3D Marine

The total pressure may have gravitational, static pressure and kinetic energy components; i.e. energy is distributed between change in the fluid's gravitational potential energy (going up or down hill), change in velocity, or change in static pressure. η is the pump efficiency, and may be given by the manufacturer's information, such as in the ...

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• ### Experiment (9): Centrifugal pump Introduction

2014-1-7 · = Change in pressure head + change in velocity head + change in elevation = H s + H v + H e Where: H s = Change in pressure head = Where P in is the fluid pressure at inlet in Pa and P out ... The efficiency of the pump may be calculated as : Where Q is the volume flow rate in 3m /s, and P m

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• ### Pump Design Equations Formulas Calculator Brake

pump efficiency: BHP = brake horsepower: NPSH = net positive suction head: V = velocity of fluid or liquid: p = impeller inlet pressure: p v = vapor pressure of fluid or liquid: SW = specific weight of fluid or liquid: g = acceleration of gravity

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