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