Causes and Solutions of Orifice Flow Meter Errors

Abstract: The reasons and solutions for the error of the orifice flowmeter are provided by the excellent flowmeter and flowmeter manufacturers. Standard orifice flowmeter is currently the main means for measuring gas, steam, liquid and induced flow in the fields of petroleum, chemical, metallurgy, electric power, heating, water supply and other fields. 1. Changes in the flow cross-sectional area In field use, the surface of the orifice plate may be bonded. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the reasons and solutions for the error of the orifice flowmeter. Standard orifice flowmeter is currently the main means for measuring gas, steam, liquid and induced flow in the fields of petroleum, chemical, metallurgy, electric power, heating, water supply and other fields. 1. Changes in the flow cross-sectional area In field use, a layer of dirt or impurities may be adhered to the surface of the orifice plate, resulting in a smaller flow cross-sectional area, an increase in the measured differential pressure, and an increase in the measured flow rate. Solution: Check whether the surrounding of the orifice plate is clean and clean it. 2. Transmitter zero drift If it is used for a long time, the zero point of the transmitter may drift. If it is a positive drift, the displayed differential pressure will increase, and the displayed flow will increase. Solution: Correct the zero point of the transmitter. 3. The length of the upstream and downstream straight pipe sections is not enough. If the length of the upstream and downstream straight pipe sections is not enough, the gas will not be fully developed, which will cause a large error in the measurement results. If there is a single elbow or flat double elbow in the specified straight pipe section upstream, will make the measurement result on the high side. Solution: Renovate the steam pipeline to make the length of the upstream and downstream straight pipe sections meet the specified requirements. Install the rectifier before the throttling device. 4. The thickness of the orifice plate does not meet the requirements. The standard stipulates that the thickness of the orifice plate should be between the opening thickness e of the orifice plate and 0.05D. If it exceeds this range, the resistance loss of gas flowing through the orifice plate will increase, and the metered value will be higher than the actual value. Solution: Check the thickness of the orifice plate, if it exceeds this range, replace it. 5. Air leakage of the three-valve group of the differential pressure transmitter If the low-pressure valve in the three-valve group leaks air, it will cause the measured differential pressure to increase, and the measurement result will increase. Solution: If the low-pressure valve in the three-valve group leaks, tighten the valve and replace it if necessary. 6. The height of the isolating liquid varies from the condensing tank to the differential pressure transmitter in the pressure guiding pipe to separate the high temperature medium from the differential pressure transmitter and protect the differential pressure transmitter. If the low-pressure measuring liquid level is higher than the high-pressure measuring liquid level, the measured differential pressure will increase, and the measured flow rate will increase. Solution: Check whether the heights of the condensing tanks on the high and low sides are consistent, and if they are inconsistent, correct them. Check that the height of the condensate tank is higher than the steam pipe, if it is lower than the pipe, raise the height of the condensate tank. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Causes and Solutions of Orifice Flow Meter Errors'

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