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John Power Point Flow Meters

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John McCutcheon

This document discusses fundamentals of flowmeters, which are instruments used to measure linear and nonlinear mass or volumetric flow rates of liquids and gases. Flow measurement is vital for industries like water supply, oil extraction, gas distribution, and pharmaceuticals. There are various types of flowmeters that measure volumetric or mass flow rates using different operating principles like variable area, Coriolis effect, differential pressure, or turbine rotation. Flowmeters must be properly selected and calibrated according to factors like the fluid properties, pipe size, pressure, temperature, and compatibility with wetted parts to ensure accurate measurements.

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Fundamentals of Flowmeters John McCutcheon January 2014
What are Flowmeters? Instruments to measure Linear Nonlinear Mass or Volumetric flow rates of liquid or gas.
Why is flow measurement vital? Industrial sectors Water supply Oil extraction Gas distribution Pharmaceutical industry
Types of Flow Measurement Mass flow rate Volume flow rate
Flow Fluid Measurements Volumetric Flow Rate Q = VT Q = volume x time Q = V x A Flow = velocity x area V = Q * T Volume = flow x time
Fluid Flow Measurements Reynolds Number (Re) = p x D * v/u p = density D = internal pipe diameter V = velocity U = dynamic viscosity
Types of Flow Laminar Transition Turbulent
Laminar Flow
Transition Flows
Turbulent Flow
Flow of Fluid Factors affecting flow of fluid: Velocity speed fluid moves Viscosity ease of flow of fluid Density weight per unit volume
Flow Meter Types
Flow Meter Types
Flow Meter Types
Flow Meter Types
Flow Meter Investigation (Variable Area Flow Meter) Advantages Disadvantages Applications
Mass Flow Meter Advantages Disadvantages Applications
Coriolis Flowmeter Advantages Disadvantages Applications
Differential Pressure Meters Advantages Disadvantages Applications
Turbine Meter Advantages Disadvantages Applications
Flow Meter Selection Reasons What is the fluid being measured by the flowmeter or flowmeters (air, water, etc.)? If it is not water, what viscosity is the liquid? Is the fluid clean? If this is a process application, what is the size of the pipe? What is the minimum and maximum process pressure? What is the minimum and maximum process temperature? Is the fluid chemically compatible with the flowmeter wetted parts?
Calibration Must be done conditions of actual operation. Performed by a certified company.
Types Of Calibration Wet calibration Standing start and finish method
Reasons For Calibration Deposit on internal surfaces Contamination Chemical attack Abuse Aging Electrical changes Mechanical changes Fluid property differences Improper instilation External influences
Calibration Time scale When should these be calibrated? Does time play a factor? Do they require to be calibrated?
Summary Of Investigation Any questions?

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John Power Point Flow Meters