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FLOW MEASUREMENT & MEASUREMENT OF LIQUID LEVEL - Coggle Diagram
FLOW MEASUREMENT & MEASUREMENT OF
LIQUID LEVEL
Primary devices
Measure the amount of fluid in terms of mass or volume that
flows past a given point in a definite period of time.
Advantages
Simple, economic and extremely accurate
method
Volumetric method
The fluid flowing in the flowmeter, which being calibrated is diverted into a TANK known as volume
When tank completely filled, this known volume is compared with the integrated volumetric quantity
Gravimetric method
The fluid flowing in the flowmeter, which being calibrated is diverted into a VESSEL
The weight of the liquid collected is compared with the gravimetric quantity
Device
Nutating Disc Meter
for domestic water
system.
https://www.youtube.com/watch?v=KS0dSXCii7s
Sliding-Vane-Type Meter
for dispensing petrol/diesel in the fuel filling station
https://www.youtube.com/watch?v=spBguHbCvJ0
Lobed-impeller Meter
metering of gas and
refined petroleum products
https://www.youtube.com/watch?v=m-ZWPnvC0wc
Secondary devices
This type of measurement instrument, they not measure the flow directly but instead measure another physical quantity which related to flow
devices
flow rate meters
principle
Variable head meters
Variable area meters
Variable head and variable area meters
Constant head device
velocity meters
Variable head meter
Target flow meter
Turbine/propeller type meter
Ultrasonic flow meter
Hot wire/ hot film anemometer
Laser Doppler Anemometer
Pitot Tube
variable head velocity
Advantages
Simple n low cost
No pressure loss in the flow system
Easily inserted to a small hole
Useful in checking the mean velocities
Drawbacks
Not suitable for measuring low velocities < 5 m/s
Sensitive to misalignment. 20° -> 2% error
Not suitable for highly fluctuating velocities
https://www.youtube.com/watch?v=3zEdtkuNYLU
INTRODUCTION
A technique used in any process requiring the transport of a
material from one point to another
Bernoulli Equation
Elements that needs to consider during flow measurement
Clean or dirty.
b. Wet or dry.
Hazardous/corrosive or safe.
laminar or turbulent.
Pressure (vacuum ~ high pressure)
Temperature.
Flow rate.
