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- Pump Size = (Flow Rate x Total Head) / (75 x Efficiency x Fluid Density) In plain English, the formula means that the Pump Size is calculated by multiplying the Flow Rate and Total Head and dividing the result by the product of 75, Efficiency, and Fluid Density.
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Example - Power pumping Water, Imperial Units. 600 gpm of water is pumped a head of 110 ft. The efficiency ofthe pump i s 60% (0.6) and the specific gravity of water is 1. The pump shaft power can be calculated as. Ph (kW) = (60 gpm) (110 ft) (1) / ( (3960) (0.6)) = 27.8hp.
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2017年9月11日 · 11. Pump calculations how to calculate pump speed, head pressure, rpm, volume flow rate, impeller diameter. In this article we learn how to perform pump calculations in both imperial and metric units to assess pumping performance following the change of flow rate, pump speed, head pressure and power.
- Overview
- Calculating Water Horsepower for a Planned Project
- Measuring a Pump's Water Horsepower
All the measurements and equations required to determine how much power you need
A pump is a basic but vital device that supplies the force to move water or other fluids from one location to another. Like any device that transfers energy across a distance, a pump’s effectiveness is measured in power. Although watts and kilowatts are more common units of power measurement, horsepower is still commonly used for high-output electrical devices in the United States. We’ll show you how to calculate the horsepower you need before installing a pump, as well as how to measure the horsepower of an existing pump.
TDH = Total Dynamic Head = Vertical distance liquid travels (in feet) + friction loss from pipe
Q = flow rate of liquid in gallons per minute
Decide on the desired flow rate.
The needs of your project determine the necessary flow rate of liquid from the pump. Write this value down in gallons per minute (gpm). You won't be using this value right away, but it will determine which pumps and pipes you consider.
In other words, you need to know how much water you need to move per minute, which will vary by project. Refer to
for common flow rate estimates.
A gardener has an irrigation plan that requires a flow rate of
Measure the height the water needs to travel.
Check the water level in the base reservoir tank.
This is the tank that supplies water for your pump. The water level in the tank will also equal the water level in the pipe, so this is the level the pump is currently drawing from. Read the indicator on your reservoir to find this.
If you are pumping from a well, either measure the depth directly or look for an estimate of water table levels in your area (at this time of year). Government agencies such as the USGS can often provide this information.
The destination reservoir is a second tank, to which the pump transfers water from the base reservoir. Make sure it is empty and connected properly to the pump.
If you do not normally have a tank here, just put down a large bucket to collect the water for this measurement. Use a bucket of known size in gallons.
Measure the vertical distance between the two locations.
Pump Power calculation Formula: Pump power P (kW) in kilowatts is equal to the product of the rate of flow q (m 3 /hr) in cubic meter per hour, fluid density ρ (kg/m 3 ) in kilogram per cubic meter, gravity g in m 2 /s, pump differential h (m) head in meter and the differential pressure p (Pa) in Pascal or N/m 2 divided by 36,00,000.
FluidTemp.(deg. C)Density(kg / M3)Vapour(pressure Kpa.)Acetaldehyde20788105Acetaldehyde30748148Acetic acid2010483.3Acetic acid anhydride2010841.3Design considerations •Common water supply systems •Cold water system •Potable/fresh water •Flushing (salt water in HK) •Cleansing water •Fire service •Swimming pool filtration •Irrigation (e.g.for landscape) •Fountain circulation •Air-conditioning water, etc. •Hot
2021年8月21日 · 08/21/2021. As an engineer, there are times when calculations need to be done quickly, even when all of the desired inputs are not readily available, to determine the best solution. With centrifugal pumps, these calculations typically deal with calculating a pump’s total head to select the optimally sized pump required.
Online Pump Power calculator. Pump Power. Pump Formulas Calculator — Imperial and SI Units. Select a Sytem Units. Imperial Units. SI Units. Imperial Units H = pump head, ft// SI Units H = pump head, m. Imperial Units Q = flow, gpm// SI Units Q = flow, m3/hr. SG = specific gravity. η = pump efficiency, decimal. P = power.
