This document provides an overview of orificemeters and their use in measuring fluid flow. It discusses how orificemeters work by using an orifice plate with a circular hole to cause a pressure drop according to Bernoulli's equation. The rate of discharge is calculated using the orifice diameter and upstream and downstream pressures. Examples are given of orificemeter setups in laboratories and their advantages over venturimeters in being cheaper while still providing accurate flow measurements.

1. Fluid Mechanics and Machinery
(CE 8394)
Panimalar Institute of Technology
Department of Mechanical Engineering
Bridge Course on
Problems on Orificemeter
Prepared by: Mr. Amos Gamaleal David
Assistant Professor
Department of Mechanical Engineering
Panimalar Institute of Technology

2. Practical Applications of Bernoulli`s
Equation
It is applied in all problems where
incompressible fluid flow along with
energy considerations is involved
1. Venturimeter
2. Orificemeter
3. Pitot Tube

3. Venturimeter

5. Orifice Plate

6. Laboratory Setup

7. Orificemeter
• It is a device used for measuring the rate of
flow of a fluid through a pipe.
• It is a cheaper device compared to
venturimeter
• It has a flat circular plate which has a
circular sharp edged hole called orifice,
which is concentric with the pipe.
• The orifice diameter is kept 0.5 times the
diameter of the pipe.
• Sometimes it may vary between 0.4 to 0.8
times the dia of the pipe

8. Rate of Discharge (Q)

12. Discharge for Venturi vs Orifice
Venturimeter
Q =𝐶 𝑑
𝑎1 𝑎2
𝑎12 −𝑎22
2𝑔𝐻
𝐶 𝑑 < 1 for Venturimeter
Orificemeter
Q = 𝐶 𝑑
𝑎1 𝑎0
𝑎12 −𝑎02
2𝑔𝐻
𝐶 𝑑 = 0.6 𝑡𝑜 0.7

13. Problems on Orificemeter

17. Inclined Ventrimeter

21. Thank You for your
Patience and Cooperation
21