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  • Specific Gravity and Viscosity | Pumps & Systems

    2011-12-17 · Specific gravity is important when sizing a centrifugal pump because it is indicative of the weight of the fluid, and its weight will have a direct effect on the amount of work performed by the pump. One of the beauties of the centrifugal pump is that the head (in feet) and flow it produces has nothing to do with the weight of the liquid.

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  • How Specific Gravity And Viscosity Affects a Pump ...

    2021-2-24 · In and of itself, specific gravity doesn’t really factor into the performance of a pump — at least not directly. But that doesn’t mean it isn’t important. As Pumps & Systems notes, “Specific gravity is important when sizing a centrifugal pump because it is indicative of the weight of the fluid, and its weight will have a direct effect on the amount of work performed by the pump. One of the beauties of the …

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  • Pumping Specific Gravity of Slurries - EDDY Pump

    Slurries will reduce head, wear down the pump, and decrease pump efficiency compared to that of water. The specific gravity of typical dredged slurries will vary between 1.0, when pumping only water, to 1.33 (40% density by weight). As the specific gravity increases such as with coarse sand and gravel, more power will be required to pump it.

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  • Improving Pump Efficiency - TACO - HVAC

    2016-8-25 · Q × F × specific gravity of water To predict operating cost, we need to take into account the efficiency factor of the electric motor driving the pump: bhp × 0.746 motor efficiency = pump kilowatts (Note: The specific gravity of fluids other than water has an effect on brake horsepower.) With heating/cooling systems

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  • Pump Efficiency - an overview | ScienceDirect Topics

    It is clear that the pump work increases dramatically as the pump isentropic efficiency drops. A decrease in pump efficiency of 90% to 70% implies higher pumping power and less net work output, but has little effect on the utilisation factor of the plant. However, a drop in pump efficiency below 50% will have a more serious effect (see Fig. 3.7). Service and maintenance is therefore key in ensuring the plant …

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  • Pump Performance - an overview | ScienceDirect Topics

    Centrifugal pump performance is defined by the head produced, not pressure. The 20.14 ft. of lift in the aforementioned example represents 8.72 psi for specific gravity 1 fluid. However, the impeller will produce the same 20.14 ft. of head with a specific gravity 0.85 fluid which calculates a pressure of 7.41 psi.

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  • Reading Centrifugal Pump Curves

    2016-2-5 · cavitation a problem for both the pump and the me-chanical seal. Specific Gravity—the weight of liquid in comparison to water at approximately 20° C (SG = 1). Specific Speed—a measure of the function of pump flow, head, and efficiency. Vapor Pressure—the force exerted by the gas released by a liquid in a closed space.

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

    2020-12-7 · Smaller centrifugal pumps have an efficiency ranging from 50% to 70%. Depending on the pump design, use, and operating conditions, centrifugal pumps have an efficiency of up to 90%. Regular maintenance, proper operating conditions, and timely repairs can help you keep your pumps operating at maximum efficiency.

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  • Pump Efficiency Archives | Vertiflo Pump Company

    For water at ambient temperature (specific gravity = 1.0), the power can be calculated using Equation 1. Equation 1. Pump input power (hp) = Flow (gpm) x Head (ft) x Specific gravity 3960 x Pump efficiency= (1000 x 100 x 1.0)/(3960 x 0.84) = 30 hp >>Read more. A Complete Line of Pumps for Industry.

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  • (PDF) Energy Efficiency in Pump System - ResearchGate

    2010-8-2 · Specific gravity. 10 ... Pump Efficiency = -----Power input to the pump shaft. Where, Hydraulic power P h (kW) = Q (m 3 /s) x T otal head,(h d-h s ...

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  • Specific Gravity and Viscosity (Part Two) | Pumps &

    2011-12-17 · Specific Gravity and Viscosity (Part Two) by Joe Evans. ... Flow, head and efficiency are reduced and 2) The brake horsepower required is increased. These changes are largely due to an increase in the fluid friction and the 'disk' losses that occur due to viscous drag on the impeller. ... Testing a specific pump with the actual liquid at the ...

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  • Learn About Pump Efficiency | Chegg.com

    The formula for calculation of efficiency of a pump is as follows: η = ρ × g × Q × H P eta =frac{ ho imes g imes Q imes H}{P} η = P ρ × g × Q × H ƞ is the efficiency of the pump ρ is the density of the fluid g is the specific gravity Q is the flow rate H is the head of the pump. P is the input power

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  • HI EDL - pumps

    2020-5-26 · s = specific gravity; n p = pump efficiency; Pump input power can also be determined if the amount of power absorbed by the fluid and efficiency are known by rearranging the equation shown for the efficiency curve: (1.B.5) P_p = {P_{w} over η_{p}} The pump input power curve is important, as it allows proper selection of a driver for the ...

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  • What is Pump Efficiency - Definition

    2019-5-22 · Pump Efficiency. Pump efficiency is the ratio of the water horsepower delivered by a centrifugal pump and the brake horsepower delivered to the pump shaft. When selecting a pump, a key concern is optimizing pumping efficiency.The energy usage in a pumping installation is determined by the flow required, the height lifted and the length and friction characteristics of the pipeline.

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  • Pump Efficiency - Centrifugal Pump - Nuclear Power

    2021-5-6 · Pump Efficiency. Pump efficiency is the ratio of the water horsepower delivered by a centrifugal pump and the brake horsepower delivered to the pump shaft. When selecting a pump, a key concern is optimizing pumping efficiency.The energy usage in a pumping installation is determined by the flow required, the height lifted and the length and friction characteristics of the pipeline.

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  • Centrifugal Pumps - Engineering ToolBox

    2021-5-7 · The higher the specific gravity of the fluid the more power is required. Centrifugal Pumps are 'constant head machines' ... 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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  • Hydraulic Horsepower - an overview | ScienceDirect

    Note that changes in specific gravity will affect the power calculations but does not affect the head capability of a pump. The pump efficiency chart (Fig. 2.21) should be used for estimating purposes only.It is useful to determine whether a particular pumping application is best met by using a positive displacement or centrifugal pump.

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  • Pump Performance | Fundamentals of positive

    2011-6-9 · PD pumps, such as vane or air-operated double-diaphragm (AODD), often are used for thin fluids. Other liquids, such as oil, have viscosities that vary with temperature. With variable viscosity liquids, a moderately small change in viscosity can have a large effect on centrifugal pump efficiency but little effect on PD pump efficiency.

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  • Learn About Pump Efficiency | Chegg.com

    The formula for calculation of efficiency of a pump is as follows: η = ρ × g × Q × H P eta =frac{ ho imes g imes Q imes H}{P} η = P ρ × g × Q × H ƞ is the efficiency of the pump ρ is the density of the fluid g is the specific gravity Q is the flow rate H is the head of the pump…

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  • HI EDL - pumps

    2020-5-26 · s = specific gravity; n p = pump efficiency; Pump input power can also be determined if the amount of power absorbed by the fluid and efficiency are known by rearranging the equation shown for the efficiency curve: (1.B.5) P_p = {P_{w} over η_{p}} The pump input power curve is important, as it allows proper selection of a driver for the ...

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  • Performance Characteristics of Centrifugal Pump

    2020-8-21 · To study the effect of slurry specific gravity on the performance of slurry pump, Figure 6, Figure 7 and Figure 8 show the variation of pump performance parameters (head, efficiency and power) with pump flow rate at various values of slurry specific gravities. it is observe that the pump head and efficiency for the pump handling soft slurries ...

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  • Pump ED 101

    2016-11-12 · pump that particular liquid. The equation below can be used to compute the horsepower required to pump liquids of varying specific gravities (where BHP is brake horsepower, Q is flow in gpm, H is head in feet, SG is specific gravity, and Eff is the hydraulic efficiency of the pump). It assumes a viscosity similar to that of water. BHP = (Q x H ...

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  • What is Pump Efficiency - Definition

    2019-5-22 · Pump Efficiency. Pump efficiency is the ratio of the water horsepower delivered by a centrifugal pump and the brake horsepower delivered to the pump shaft. When selecting a pump, a key concern is optimizing pumping efficiency.The energy usage in a pumping installation is determined by the flow required, the height lifted and the length and friction characteristics of …

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  • Appendix F: Horsepower and Kilowatt Calculations

    Typical specific gravity 1.0 1.024 0.85 0.85 Example 1 - Horsepower Calculation A seawater service pump installed in the engine room at a 50° c ambient. Calculate the horsepower nameplate rating of the motor, when the pump capacity is 550 gallons at 300ft pressure head, a 8t9 percent pump efficiency (η), and motor efficiency (η) is 92 ...

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  • Centrifugal Pumps - Engineering ToolBox

    2021-5-7 · The higher the specific gravity of the fluid the more power is required. Centrifugal Pumps are 'constant head machines' ... 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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  • Factors Affecting the Performance of a Centrifugal

    2018-8-23 · In general, a centrifugal pump is suitable for low viscosity fluids since the pumping action generates high liquid shear. Specific Density and Gravity of Working Fluid; As the density of a fluid is its mass per unit of volume, a fluid’s mass per unit volume and gravity of a fluid is the ratio of a fluid’s density to the density of water.

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  • Section TECH-A Centrifugal Pump Fundamentals

    The static head corresponding to any specific pressure is dependent upon the weight of the liquid according to the following formula. Head in Feet = Pressure in psi x 2.31 Specific Gravity A centrifugal pump imparts velocity to a liquid. This velocity energy is then transformed largely into pressure energy as the liquid leaves the pump.

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  • Pump Power Calculator - Online Calculator -

    Pump Power Calculator in imperial Units/SI Units. P = power depend on: kW, H = head, m, Q = flow, m3/hr, SG = specific gravity, η= pump efficiency, decimal.

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  • How to improve pump energy efficiency - World Pumps

    2016-2-25 · Specific gravity: 0.8 Specific heat: 1.67 kJ-°C (0.4 BTU/lb-°C) System pressure: 345 kPag (50psig) in seal chamber Pump driver: 50 HP (typical) Sealing devices: Mechanical seals Assumptions: Heat lost at the pump must be replaced at the system boiler …

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  • Performance Characteristics of Centrifugal Pump

    2020-8-21 · To study the effect of slurry specific gravity on the performance of slurry pump, Figure 6, Figure 7 and Figure 8 show the variation of pump performance parameters (head, efficiency and power) with pump flow rate at various values of slurry specific gravities. it is observe that the pump head and efficiency for the pump handling soft slurries ...

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  • Pump ED 101

    2016-11-12 · pump that particular liquid. The equation below can be used to compute the horsepower required to pump liquids of varying specific gravities (where BHP is brake horsepower, Q is flow in gpm, H is head in feet, SG is specific gravity, and Eff is the hydraulic efficiency of the pump). It assumes a viscosity similar to that of water. BHP = (Q x H ...

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  • Pump Power Calculator - Engineering ToolBox

    2021-5-7 · SG = Specific Gravity (1 for water) η = pump efficiency. Example - Power pumping Water. 1 m 3 /h of water is pumped a head of 10 m. The theoretical pump power can be calculated as. P h(kW) = (1 m 3 /h) (1000 kg/m 3) (9.81 m/s 2) (10 m) (3.6 10 6) = 0.027 kW. Shaft Pump Power

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  • HI EDL - pumps

    2020-5-26 · s = specific gravity; n p = pump efficiency; Pump input power can also be determined if the amount of power absorbed by the fluid and efficiency are known by rearranging the equation shown for the efficiency curve: (1.B.5) P_p = {P_{w} over η_{p}} The pump input power curve is important, as it allows proper selection of a driver for the ...

    Get Price
  • What is Pump Efficiency - Definition

    2019-5-22 · Pump Efficiency. Pump efficiency is the ratio of the water horsepower delivered by a centrifugal pump and the brake horsepower delivered to the pump shaft. When selecting a pump, a key concern is optimizing pumping efficiency.The energy usage in a pumping installation is determined by the flow required, the height lifted and the length and friction characteristics of the pipeline.

    Get Price
  • (PDF) Performance Evaluation of a Centrifugal Pump

    Cast iron has a specific gravity of 7.3. 3.2 Bronze . ... Total head, pump efficiency and the flow rate of the cast brass impeller were higher than those of the cast iron impeller.

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  • Temperature rise in pumped liquid - centrifugal pump

    2019-8-15 · C = specific heat of liquid E = pump efficiency at the given flow rate, in decimal point The number 778 is a unit conversion factor. Or use, Equation 2: T = [2545 x (BHP-WHP)] [(QxC)] where: T = temperature rise, in degrees F BHP = brake horsepower WHP = water horsepower (*) Q = flow rate, in pounds per hour C = specific heat of liquid

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  • Affinity laws | KSB

    Power input (assuming identical pump efficiencies) Flow coefficient; Head coefficient; If Δh s = Y (see Specific energy) is inserted, the pressure coefficient in its known form can be established: As pump efficiencies are more or less dependent on friction conditions, they are subject to other conversion laws (see Efficiency scale-up). The ...

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  • Pump Capacity Variation With Density - Industrial ...

    2012-3-19 · Pump Capacity Variation With Density - posted in Industrial Professionals: Hi If a pump is selected for 100 m3/hr at a given mass density of a fluid, will the pumping capacity of the pump change with variations in density due to temperature? My understanding is that centrifugal pumps are volumetric machinery and hence, they work at a fixed volumetric flow even if there are density variations ...

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  • - Power and Efficiency - Beckwith & Kuffel

    2021-5-11 · The pump capacity in gpm and the liquid specific gravity are normally used in the formulas rather than the actual weight of the liquid pumped. Pump input or brake horsepower (bhp) is the actual horsepower delivered to the pump shaft. Pump output or hydraulic horsepower (whp) is the liquid horsepower delivered by the pump.

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  • Strategies to Increase Energy Efficiency of Centrifugal ...

    2012-2-24 · The pump develops the same head in meters of liquid independent of specific gravity. The pump delivers the same quantity by volume independent of specific gravity but the quantity by weight will be proportional to specific gravity. The input power and the output power for a given volumetric discharge vary in proportion to density.

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  • POWER AND EFFICIENCY OF CENTRIFUGAL PUMP ~

    2016-10-13 · Specific gravity= Specific gravity of liquid Efficiency = Pump efficiency, % The constant 3960 is obtained by dividing the number or foot-pounds for one horsepower(33,000) by the weight of one gallon of water (8.33 pounds).

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  • Pump Efficiency - Centrifugal Pump - Nuclear Power

    2021-5-6 · Pump Efficiency. Pump efficiency is the ratio of the water horsepower delivered by a centrifugal pump and the brake horsepower delivered to the pump shaft. When selecting a pump, a key concern is optimizing pumping efficiency.The energy usage in a pumping installation is determined by the flow required, the height lifted and the length and friction characteristics of the pipeline.

    Get Price
  • Energy Tips – Pumping Systems

    2014-5-22 · pump will be powered by a 700-hp motor, operate for 8,000 hours annually, and transport fluid with a specific gravity of 1.0. One candidate pump has an efficiency (η 1) of 81% at the operating point; a second is expected to operate at 78% efficiency (η 2). What are the energy savings given selection of the first pump?

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  • Solved: A 15 KW Pump With 80% Efficiency Is

    A 15 kW pump with 80%. efficiency is discharging oil of. specific gravity 0.85 to the. overhead tank as shown in the. figure. If losses in the whole. system are 1.75 m of flowing

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  • HVAC FORMULA: PUMP EQUATIONS

    2020-2-29 · Specific Gravity Specific gravity is direct ratio of any liquid’s weight to the weight of water at 62 deg F. Water at 62 deg F weighs 8.33 lbs per gallon and is designated as 1.0 specific gravity. By definition, the specific gravity of a fluid is: SG = PF PW Where PF is the fluid density and PW is water density at standard conditions.

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  • Brake horsepower - Pump Calcs

    This calculator can be used to determine the centrifugal pump brake horsepower (BHP) for a given flow rate (Q), head (H), specific gravity (S.G.), and efficiency (Eff). If you enter any four of these variables as inputs, the calculator will determine the fifth variable.

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  • Pump Ed 101

    2016-11-12 · On the pump side it computes specific speed, suction specific speed, min & max acceptable flow, actual pump efficiency and cost per 1000 gallons pumped just name a few. On the motor side it computes HP, torque, kVA, power cost per hour, voltage unbalance and …

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  • AU2013214692B2 - Pump efficiency determining

    A system for measuring real time efficiency/performance of at least one pump in a plant or other facility includes a plurality of monitoring devices disposed in relation to said at least one pump to measure power usage, pump speed and flow characteristics of the at least one pump. A processing system is configured to receive input signals from the sensors in which the efficiency of the at ...

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