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Flow Measurement
• Overview
• Basics
• Measuring Methods & Its Application
• Comparison
Primary Basic• Accuracy
• Full Scale Accuracy• Rate Accuracy
• Rangability
• Turndown
• Incompressible – Compressible Flow
• ACFM
• SCFM
• Full Scale Accuracy
Flo
wm
eter
Sig
nal
100%
S
QQFSFlow Rate
0
Flo
wm
eter
Sig
nal
100%
S
QQFSFlow Rate
0
• Rate Accuracy
Measuring Methods
• Head Type Flowmeters
• Mechanical Flowmeters
• Electronic Flowmeters
• Mass Flowmeters
Head Type Flowmeters• Basic
gh+v2/2+p/ρ= Constant
Different Type of Head Type Flowmeters
• Orifice Plate
• Venturi
• Flow Nozzle
• Pitot Tube
• Elbow
Orifice Plate
Basic Equation :V=k*(h/D)0.5
Orifice for High Viscose Liquids
Orifice
• Service: Clean Liquids, Gases Steam,(no slurries or corrosive)
• Scale: Square Root
• Accuracy: 1% Full Scale
• Permanent Pressure Loss: High
• Cost: Low
Venturi & Flow Nozzle
Flow Nozzle
• Service: Liquids, Gases, Steam, High Velocity Flows
• Scale: Square Root
• Accuracy: 1% Full Scale
• Rangability: 3:1
• Permanent Pressure Loss: High
• Cost: High
Venturi
• Service: Clean Liquids, Gases Steam Slurries and Dirty Fluids
• Scale: Square Root
• Accuracy: 1% Full Scale
• Rangability: 3:1
• Permanent Pressure Loss: Low
• Cost: High
Pitot Tube
Averaging Pitot Tube
Variable Area Meters
Mechanical Flowmeters
Turbine Flowmeters
Turbine Meters
Rotary Flowmeters
Electronic Flowmeters
Vortex Flowmeters
Ultrasonic Flowmeters
Custody Transfer
Mass Flowmeters
Coriolis Flowmeters
Coriolis Flowmeters
Thermal Mass Flowmeters