Depressors, 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 depressurizers is a common technique used to measure fluid flow in pipelines.
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.
Orifice plates are 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.
A liquid with a constant flow rate is bound to increase in velocity as it passes through the orifice.
At the same time, there is an opposite change in pressure, i.e. a drop in static pressure at the orifice.
Pressure taps on either side of the diaphragm are used to measure the static pressure difference.
There are several types of deprimogenic organs, including :
Orifice plates
Monobloc diaphragms
Annular chambers
Orifice plates are the most common and simplest type of depressurizer. They are installed in the pipe between flanges and have a hole in the center through which the fluid flows.
Monobloc diaphragms are another type of depressurizer. They are made of a single piece of material, metal, with a hole in the center.
The annular chambers consist of two concentric rings separated by an annular space. The inner ring has an orifice in the center through which the fluid flows. They have the advantage of being easy to dismantle, so that the measuring plate can be changed if the nominal flow rate changes, or if the plate wears out.
Orifice flow measurement offers the following advantages:
The disadvantages of orifice flow measurement are as follows:
