Orifice Meter

Pharmacutical engineering , orifice meter , principal , working , equation etc.

1. ORIFICE METER BY ARUNANGSHU CHAKRABORTY 2 ND YEAR 3 RD SEMISTER DEPARTMENT OF PHARMACUTICAL TECHNOLOGY JIS UNIVERSITY

2. INTRODUCTION DIAGRAM CONSTRUCTION WORKING APPLICATION REFFERENCE Content:

3. INTRODUCTON It is also known as Pipe orifice & Orifice plate. It m a y be in s tal l e d i n pipeline wit h a minimum of trouble and expense. Pipe orifice is a device used for measuring the rate of flow of a fluid through a pipe.

4. CONSTRUCTION: It is consider to be a thin plate containing a sharp aperture through which fluid flows . Normally it is placed between long straight pipes . For present discussion plate is introduced into pipe and manometer is connected at points A and B. Diagrammatic representation of orifice meter Manometer

5. Working: When fluid is allowed to pass through the orifice the velocity of the fluid at point B increases and pressure will be low , as a result at point A pressure will be more . Bernoulli's equation is applied to point A and point B for experimental conditions .

6. Total energy at point A = Pressure energy + Potential energy + Kinetic energy , Bernoulli’s eqn... The diameter of the liquid stream maximum at point B and lesser than diameter of the orifice . Hence if a constant is included to correct for difference in liquid velocities at point B and at orifice it can be written as . ΔH Difference in pressure head, can be measured by manometer C = constant coefficient of orifice (friction losses) U0 = velocity of fluid at orifice. If the diameter of the orifice is 1/5 th of the pipes diameter or less then U A Is so small compared to so that the earlier equation may be neglected . Then the equation becomes … 2 U 2

7. Application: Orifice plates are most commonly used to measure flow rates in pipes. when the orifice plate is constructed and installed according to appropriate standards, the flow rate can easily be determined using published formulae based on substantial research and published in industry, national and international standards.

8. CONCLUSION : Once the orifice plate is designed and installed, the flow rate can often be indicated with an acceptably low uncertainty simply by taking the square root of the differential pressure across the orifice's pressure and applying an appropriate constant. Even compressible flows of gases that vary in pressure and temperature may be measured with acceptable uncertainty by merely taking the square roots of the absolute pressure or temperature, depending on the purpose of the measurement and the costs of instrumentation .

9. REFERENCE: “Pharmaceutical Engineering”, By K . Sambamurthy , Ashutosh Kar ,2nd edition ,” Flow of Fluid”, Page no. 23-25 .

10. Thank you…….