Introduction of Flow Meter for Throttle Orifice Plate Device
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Release Time：2022-06-23
When the pressure difference between the front and back of the pipeline is large, the orifice plate is often used. The principle is: when the fluid flows in the pipeline, due to the local resistance of the orifice plate, the pressure of the fluid decreases and the energy is lost. This phenomenon is thermodynamically called throttling. This method is simpler than using a regulating valve, but it should be appropriate, otherwise the liquid is prone to cavitation and affects the safe operation of the pipeline.
When the pressure difference between the front and back of the pipeline is large, the orifice plate is often used. The principle is: when the fluid flows in the pipeline, due to the local resistance of the orifice plate, the pressure of the fluid decreases and the energy is lost. This phenomenon is thermodynamically called throttling. This method is simpler than using a regulating valve, but it should be appropriate, otherwise the liquid is prone to cavitation and affects the safe operation of the pipeline.
The application of the flow meter of the orifice plate device: the fluid must flow continuously through the pipe; The fluid must be Newtonian fluid and uniform single phase in physics and thermodynamics. No phase change occurs when the fluid flows through the throttling device. The fluid flow basically does not change with time and is not suitable for pulsating flow and critical flow. Before the fluid flows through the throttling device, the fluid flow conditions should be turbulent, the Reynolds number should be within a certain range, and there should be no vortex; the flow beam must be parallel to the pipeline axis, and there should be no rotating flow.
The flow meter of the throttle orifice device consists of a pressure flange or ring chamber, an orifice plate and a differential pressure transmitter. The pressure flange or ring chamber is used to take out the fluid pressure before and after the orifice plate, the orifice plate is used to throttle the pressure difference, and the differential pressure transmitter is used to measure the pressure difference before and after the orifice plate, so as to measure the fluid flow through the orifice plate.
Installation requirements for flowmeter of throttle orifice plate device: the installation requirements for throttle device are front10Double and after5Straight pipe section with double pipe diameter; The opening and clamping flange of the throttling part shall be concentric with the pipeline, and the front end face of the throttling part and its clamping flange shall be perpendicular to the pipeline axis; The sealing gasket of the clamping throttling part shall not extend into the inner wall of the pipeline, and the thickness of the gasket shall not exceed the specified value; The acute angle of the orifice plate should face the flow direction. The newly installed pipeline system must be purged before the orifice plate can be installed, the pressure tap shall be formed at the upper part of the pipe and the vertical line in the pipe.45When measuring liquid, the pressure taking port should be at the lower part of the pipeline and the horizontal center line of the pipeline.45When measuring steam, the pressure taking port should be at the upper part of the pipe and the horizontal center line of the pipe.45within the included angle of degrees.
Debugging and deactivation methods of flowmeter of throttling orifice plate device: before debugging, check whether the pipeline is clean, whether the flowmeter meets the requirements and whether the pressure test is completed; Ensure that the flowmeter runs smoothly within its effective measurement range after operation; The debugging steps of flowmeter are as follows: the balance valve shall be opened to slightly open the root valve, the secondary valve and the drain valve shall be closed, and the pressure pipeline system shall be checked for leakage. If there is no leakage, fully open the primary valve to open the blowdown valve respectively for blowdown, then close the blowdown valve, loosen the plug of the positive and negative pressure chamber of the differential pressure transmitter, remove air, open the transmitter positive pressure valve, close the balance valve, open the transmitter negative pressure valve, and start the differential pressure transmitter. The closing steps of the throttle orifice flowmeter are as follows: close the negative pressure valve of the transmitter, open the balance valve, close the positive pressure valve of the transmitter, close the secondary valve, open the blowdown valve for blowdown, and then close the blowdown valve.
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