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Flow meter
This document compares different types of flow measuring devices. It discusses differential pressure flow meters like orifice plates, venturi meters, and rotameters that measure flow based on pressure differences. Positive displacement flow meters like gear meters and turbine meters directly measure flow volume. Electromagnetic flow meters measure flow velocity electromagnetically in conductive liquids. Ultrasonic and vortex flow meters use ultrasonic signals or vortex shedding to determine flow velocity. The document provides details on the working principles and applications of these common flow meter technologies.
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Flow meter
- 2. OBJECTIVE The objective ofour presentation is comparisons of different flow measuring devices.
- 3. FLOW METERS A flowmeter(or flow meter / flow indicator / flow gauge depending on industry) is simply defined as a device used to measure the speed at which a gas or liquid is moving through a pipe.
- 4. TYPES OF FLOWMEASUREMENT Mass flow rate Volume flow rate
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- 7. TYPE OF FLOWMETER Differential Pressure Flow Meters • Orifice meter • Venturi meter • Rota meter • Pitot tube Displacement Flow • Positive Displacement Flow • Gear Flow Meters • Turbine flow meter • Paddlewheel Flowmeters • Variable-Area Flowmeters (Rotameters) Electromagnetic Flow Meter • Ultrasonic Flowmeters • Doppler-Effect Ultrasonic Flowmeters • Vortex Flowmeters • Laser Doppler velocimetry (LDV) • Particle image velocimetry (PIV)
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- 9. ORIFICE PLATES • Anorifice plates is a plate with a circular hole in the middle of it. • Flow through hole, velocity will increase and the pressure will decrease.
- 10. ORIFICE PLATES • Sharpsquare edged cylindrical throat. • Pressure difference proportional to flow rate. • Cheap, good performance and reliability. • Moderate cost with Simple metrology.
- 11. VENTURI METER • Ameter consist of short converging pipe relatively longer pipe diverging with suitable pressure differential measurement. • When fluid passes through converging side its velocity increases maximum at throat and and become same after passing throat.
- 12. VENTURI METER • Bestaccuracy. • Least head loss as compared to orifice & nozzle meter. • Can be used with dirty fluids also. • Relatively expensive.
- 13. VARIABLE-AREA FLOWMETERS (ROTAMETER) • A rotameter is device measure flow rate of liquid and gas in a closed tube. • pressure drop remain constant and flow varies directly with cross sectional area
- 14. ROTA METER Working Principle •When fluid enter from bottom it exert force on float • float move up • gravitational and force exerted by liquid become equal equilibrium exist • float becomes stationary • flow rate measure by graduation scale on float
- 15. PITOT TUBE Pitot tubemeasure local velocity at given point in stream not average velocity in pipe.
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- 18. POSITIVE DISPLACEMENT FLOWMETERS oIt has a low pressure drop o used with high- or low viscosity liquids at temperatures up to 230°C o pressures up to 7 Mpa o flow rates of up to 700 gal/min (or 50 L/s).
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- 24. With best wishesof success for my presentation Thank you!