This document summarizes an orifice flow meter. It defines an orifice flow meter as a device that uses a restriction or conduit to create a pressure drop and measure flow rate of fluids. It then lists some key advantages as having a simple structure, being relatively cheap, occupying less space, and being easy to install. Some disadvantages mentioned are poor pressure recovery resulting in power loss, increased friction, and low coefficient of discharge values between 0.62 to 0.68. It concludes that orifice flow meters are widely used due to their simple structure, easy installation, and inexpensive nature.

2. Introduction
Presented By:
Syed Misbah Ullah
M13-CE53

3. Orifice flow meter
• Table of contents
 Applications
 Advantages
 Disadvantages

4. Orifice flow meter

5. Definition
• A device which is used to measure flow rate
• It is conduit or restriction to
create pressure drop.
• Used for all fluids

6. Laboratory pic of
Orifice meter

7. Applications
 It is used for close system
 An orifice plate can be use to measure the flow of
• Gases
• Liquids

8. Applications
• Gases:-
Small dia orifice plate is
used for gases because
Gases are compressible
fluid

9. Applications
• Liquids:-
Large dia
Orifice Plate is used
for liquids Because
liquids are
incompressible

10. Applications
•animation

11. Advantages
• Simplest Structure.
• Relatively Cheap.

12. Advantages
• Occupies less space
and
• installation is easy.

13. Advantages
• For fluids containing solid particles
an eccentric or
segmental orifice can be used.

14.  Advantages
• Measuring range can be
changed easily

15. Advantages
• Flow rate is proportional to pressure drop
𝑄 = 𝑘 𝑑𝑒𝑙 𝑃
Q= Flow rate
K= A constant value, which is determined by orifice size and types of
the fluid
del= Change
P= differential pressure across the orifice plate

16. Disadvantages
• Pressure recovery is poor, thus resulting power loss is
more.
• It maximizes form friction (Friction within the layers of
fluids)
• Value of Coefficient of discharge is less. It's value is 0.62
to 0.68

17. Disadvantages
Coefficient of discharge
CD=
𝐴𝑐𝑡𝑢𝑎𝑙 𝑓𝑙𝑜𝑤
𝑇ℎ𝑒𝑜𝑟𝑖𝑡𝑖𝑐𝑎𝑙 𝑓𝑙𝑜𝑤
=0.62 to 0.68
(Which mean high losses)
• Area of vena contracta has to be calculated

18. • Disadvantages
• In gas applications in order to be accurate, it requires
constant
Pressure
temperature

19. Conclusion
o flow sensor which is used throughout the World is the Orifice
flow meter due to
• Its simple structure,
• Easy to install, and
• Inexpensive nature

20. Syed Misbah Ullah
Mob=+923068520193
Institute of Chemical Engineering & Technology Punjab University Lahore