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1. Static pressure and differential pressure of orifice flowmeter
The static pressure and differential pressure of orifice flowmeter are the core parameters for measuring flow rate. Understanding them, one can master the working principle of this flowmeter. 1. Definition and Action: Static pressure is the inherent pressure of a fluid flowing in a pipeline, which is not affected by flow velocity and reflects the potential energy of the fluid. In a horizontal pipeline, it can be imagined as the pressure exerted on the pipe wall when the fluid is at rest. Its main function is to monitor the pressure status inside the pipeline, which is an important indicator to ensure the safe operation of the pipeline system. Differential pressure refers to the pressure difference generated before and after the fluid flows through the orifice plate throttling element. Due to the obstruction of the orifice plate, the fluid velocity increases at the orifice plate, and according to Bernoullis principle, its pressure will decrease, thus forming a pressure difference. This differential pressure value is the direct basis for calculating fluid flow rate, as the flow rate is directly proportional to the square root of the differential pressure. The method of measuring static pressure usually involves opening a pressure tap on the pipeline wall and connecting a pressure sensor or gauge. The selection of this pressure point is crucial and must be located on a straight pipe section where fluid flow is stable, avoiding eddies and severe disturbances, to ensure the accuracy of data reading. To measure differential pressure, two pressure measuring points are required, located at the front and rear ends of the orifice plate, and the pressure d
2. If the orifice flowmeter is worn, is the measured flow rate too high or too low?
Too high. When the inlet edge of the orifice plate becomes dull or corroded, resulting in a notch, or when there is a weld or measuring flange gasket protruding into the pipeline in front of the orifice plate, the actual flow coefficient will be overestimated. A standard orifice flowmeter is a differential pressure generating device used to measure flow. When paired with various differential pressure gauges or transmitters, it can measure the flow index of various fluids in pipelines.
3. Heavy hammer level gauge
4. What kind of instrument does an orifice flowmeter belong to?
An orifice flowmeter belongs to a differential pressure flow instrument.
1. Instrument classification attributes: 1 The measurement principle is based on the pressure diff