Intelligent orifice flowmeter

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1. The reason for the gradual decrease in flow rate of the orifice flowmeter is usually caused by blockage of the throttling device, changes in fluid properties, or measurement system failures. Accumulation of impurities or crystals in the pipeline at the front end of the orifice plate can alter the cross-sectional area of the flow channel, causing the actual flow coefficient to deviate from the design value. A certain chemical plant once formed an oil film on the surface of the orifice plate due to the presence of condensate oil in natural gas, resulting in a measurement deviation of up to 15%. In low temperature environments during winter, water containing media are prone to freezing at the throttling element, causing a decrease in the flow area. This seasonal fluctuation requires special attention. 1. Changes in fluid parameters such as viscosity, density, or temperature of the medium can affect measurement accuracy. In steam flow measurement, a pressure fluctuation of 0.1 MPa can cause a density change of about 3%, which can cause a drift in the displayed value for systems without temperature and pressure compensation. During gas measurement, component changes are particularly sensitive. For example, after adjusting the calorific value of gas, methane content fluctuates by 5%, and although the actual flow rate remains unchanged, the displayed value may deviate by 8%. 2. Abnormal accumulation or leakage in the pressure guiding pipe of the pressure system can cause distortion of the differential pressure signal. In steam measurement, the unbalanced liquid level in the condenser can cause permanent deviation. A certain thermal power enterprise experienced a continuous low flow display due to uneven heat tracing of the pressure pipe in winter. The scaling of the isolation diaphragm of the membrane type differential pressure transmitter can also weaken the sensing sensitivity, which requires professional cleaning and calibration. 3. The wear of the inlet edge of the orifice plate in the mechanical state of the equipment can increase the flow coefficient, while the increase in surface roughness caused by corrosion may decrease the coefficient. This composite effect requires actual calibration. The additional resistance caused by the installation of eccentric or sealing gaskets protruding into the interior of the pipeline often manifests as a slow linear decrease in flow readings. The module failure of the smart transmitter may exhibit a jumping change, which is significantly different from the slow descent characteristics caused by mechanical reasons. During regular maintenance, it is important to check the sharpness of the orifice plate, with the standard being that the edge arc radius should not exceed 0.0004d (where d is the aperture). For easily crystallized media, it is recommended to install flange pressure orifice plates and set up online cleaning devices when the process allows. Winter insulation measures need to cover the entire pressure pipeline, and the zero calibration frequency of the transmitter should be appropriately increased according to the cleanliness of the medium.

2. Introduction to Orifice Flow Meter

Orifice flow meter is a high range ratio differential pressure flow device composed of a standard orifice plate and a multi parameter differential pressure transmitter (or differential pressure transmitter, temperature transmitter, and pressure transmitter), which can measure the flow of gas, steam, l

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