Orifice Meter its advantages and disadvantages

 

What is an Orifice Meter?

The orifice meter is a type of flow meter used to measure the flow rate of fluids (liquids or gases) based on the principle of differential pressure measurement. 

 Construction of Orifice Meter

  • Inlet Section: The fluid from one end of the pipe enters through this section. The diameter of the section depends on the flow to be measured.
  • Orifice Plate: A device used for measuring flow rate, lowering pressure, or restricting flow is called an orifice plate
  • . These plates are usually thin with holes that are installed in pipes.
  • U-Tube Manometer: A manometer monitors the pressure of fluids.
  • A U-tube column filled with mercury serves as the pressure reading display in a U-tube manometer. One end of it is installed before the orifice plate and the other end is installed after it.
  • Outlet Section: This is the section where the fluid is discharged.

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Advantages of Orifice Meter

  • When compared to other flow metres, such as the venturimeter, the orifice metre is fairly affordable
  • The installation space required by the orifice meter apparatus is minimal
  • Typically, it is narrow enough to fit between two pipes
  • Costs to keep it running smoothly are minimal.
  • It delivers a very small pressure drop
  • This design and fabrication (construction) of orifice meters are quite simple.

Disadvantages of Orifice Meter

  • The minimum pressure required to measure the flow can be challenging occasionally due to the restrictions on the length of the vena-contracta
  • The fluid viscosity, density, and pressure can have an impact on the accuracy of the orifice meter
  • The overall differential pressure head loss falls in a whopping range from 40% to 90%
  • Discharge coefficient will always be low.

Application of Orifice Meter

The primary function and use of orifice metre is to measure flow rates, and it can be found in a variety of applications including refineries, water treatment plants, natural gas processing plants, petrochemical plants, and oil filtration plants.

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