Atmospheric pressure is 14.7 psia.

This head when multiplied by the volumetric flow of gas (Q) gives the compressor power equations. 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. Power is consumed by a pump, fan or compressor in order to move and increase the pressure of a fluid.

Any projects making use of information from this website are undertaken at your own risk. Hence, pump shaft power requirement = 16.35 kW / 0.7 = 23.36 kW. Calculate the pump discharge pressure from the pump total head The application of Appropriate Technology. However for purpose of this sample problem the efficiency is to be taken as 90% as per problem statement.

But opting out of some of these cookies may have an effect on your browsing experience. Assume the motor efficiency to be 90%. The purpose is to check if the pump will work appropriately. flow rate of 17 L/min, viscosity of water , 38m of 1/2” ID piping with a 10m lift and also include joints and explain how you might calculate looses in those joints. 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. delivery pipe is less than half of that for the ½” dia. I shared to you a spreadsheet to calculate centrifugal pump. The pump is connected to a pipe of same diameter DN100 at the inlet and outlet of the pump. NSPH of pump is calculated as follow: NPSH available (ft, m) = absolute pressure (ft, m) – vapor pressure (ft, m) – line loss (ft, m) ± elevation difference (ft, m) EXAMPLE 1: Calculation of NPSH of Pump for Suction Lift. Este sitio está dirigido a proporcionar los recursos técnicos e información para ayudar a la Tecnología Apropiada (AT) especialistas que trabajan en las áreas siguientes: abastecimiento de agua potable, saneamiento, suministro eléctrico, construcción, bajo consumo de combustible de cocinas y educación ambiental. The ideal hydraulic power to drive a pump depends on. This website uses cookies to improve your experience. Examples of common residential water systems 15. Support our efforts to make even more engineering content. Suction line is 6" in size and 10m long.

First we will calculate the theoretical power requirement using the pump power equation. At its most basic, work is a product of force and displacement: $$ Work = Force * Displacement $$ And Power is a calculation of work over time; This category only includes cookies that ensures basic functionalities and security features of the website. Motor power may be calculated as the shaft power divided by the motor efficiency.

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):. Power and Efficiency Equations for Compressor Calculations, Key terminology for relief devices on vessels, API Standards for Heat Transfer Equipments, Sample Problem – NPSHA calculation for pumps. Unlock the full document with a free trial.   The water stream is available from a storage tank which operates at atmospheric pressure and 250C. Necessary cookies are absolutely essential for the website to function properly.

This design pressure value is used... Air coolers are used in industrial applications when reliable source of water is not available. pipe. how can you calculate a pump requirement for a water pumping system in the following arrangement. NPSH available (ft, m) = absolute pressure (ft, m) – vapor pressure (ft, m) –  line loss (ft, m) ± elevation difference (ft, m). Calculation: Once these variables are defined, it’s as simple as applying them to the calculation of power and cancelling out units of measure until we arrive at our desired Horsepower output. To calculate the new pump head pressure from an increase or decrease in pump speed rpm, the following formula and calculation can be used. It is proposed to use a pump to push the water up to the reservoir tank at a flow rate of 0.5LPS.

Volumetric flow = 200,000 / 994.72 = 201.06 m3/hreval(ez_write_tag([[336,280],'enggcyclopedia_com-banner-1','ezslot_9',107,'0','0'])); Also the differential pressure is determined using differential head as, ΔP = ρgΔh = 994.72 × 9.81 × 30/105 = 2.93 bar. Electric Motor Absorbed Power Estimation Very often one needs to know the power absorbed by say, a pump or a carrier or fan or some other equipment driven by an electric motor. NPSHA = 2.31 x (37.5+14.7)/0.56 – 2.31 x 52.2/0.56 – 2.5 + 8 = 5.5 ft. (absolute pressure is gauge pressure plus atmospheric pressure. Calculation of power required for hydraulic pump has been explained with an example. To calculate the new flow rate of a pump from an increase or decrease in pump speed RPM, the following formula and calculation can be used. The shaft power is the power supplied by the motor to the pump shaft. NPSH available (NPSHA) shall be greater than NPSH required (NPSHR), for suction lift, elevation difference is minus, Cooling Tower Makeup Water Calculation with Example, Quantitative Risk Analysis Techniques Part 1, Sizing of Compressor and Instrument Air Capacity, How to Calculate Jockey Pump Capacity in Fire Fighting System, Sizing of Expansion Tank for Hot Oil System, Several Natural Gas Dehydration Methods and Range of Application, Qu’est-ce que le traitement des eaux usées –, Estimating Exit Temperature in Throttling Process (Free Calculation Spreadsheet), The Difference between Pre-feasibility Study and Feasibility Study, Inert Gas Purging Requirement Calculation, How to Write Marketing Aspect of Feasibility Study, Typical Configuration of Pump in Piping and Instrumentation Diagram (P&ID), How To Estimate Optimum Insulation Thickness, Sizing and Horse Power Estimation of Counterflow Induced-Draft Cooling Tower, Hydrate Prediction using Vapor-Solid Equilibrium Constant, Water Treatment Plant Capacity Calculation, How to Calculate NSPH of Pump with Examples and Illustrations.


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