primary elements, including orifice plates and monobloc diaphragms, are essential tools for measuring fluid flow in pipelines, providing a simple and effective technique for monitoring and controlling fluid movement.
Flow measurement using orifice plate is a common technique used to measure the flow of fluids in pipes.
In this method, a measuring device with an orifice is placed in the pipe at the point where the fluid is to be measured.
The differential pressure between the upstream and downstream sides of the orifice is then measured, and this value is used to calculate the instantaneous volume flow rate
Orifice plate is used to measure the flow of liquids, gases and steam.
An orifice plate is a thin rigid plate with an orifice.
This plate is inserted into the pipe perpendicular to the direction of flow.
The liquid, whose flow rate is constant, necessarily increases in velocity as it passes through the orifice.
The liquid, whose flow rate is constant, necessarily increases in velocity as it passes through the orifice.
The static pressure difference can be measured by means of pressure taps on either side of the diaphragm using a differential pressure transmitter.
There are several types of orifice plates, including :
Orifice plates
Monobloc diaphragms
Annular chambers
Orifice plates are the most common and simplest type of orifice. They are installed in the pipe between flanges and have a hole in the centre through which the fluid flows.
Monobloc diaphragms : One-piece diaphragms are another type of orifice. They are made of a single piece of material, metal, and have a hole in the centre.
The annular chambers consist of two concentric rings separated by an annular space. The inner ring has an orifice in the centre through which the fluid flows. They have the advantage of being easily removable so that the measuring plate can be changed if the nominal flow rate changes or if the plate wears out.
The advantages of orifice flow meter are as follows:
The disadvantages of orifice flow measurement are as follows:
