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A brief analysis of common faults in turbine flowmeters and their solutions

2019-07-12View Original

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 1. Since coke oven gas has a high temperature and high humidity at the time of production, moisture is present during its transportation. Gas flow drives the water to fluctuate back and forth, thereby creating a pulsating flow. When the vortex flow meter is in such a fluid condition, the data it outputs fluctuates greatly, and Control Engineering Network holds the copyright; as a result, it is completely unable to reflect the actual production conditions.   2. Since coke oven gas contains many impurities that tend to crystallize, these impurities accumulate on the sensor head, resulting in inaccurate measurement. As the temperature rises, impurities volatilize, sensitivity increases, and the signal gets stronger ; Conversely, it decreases. This leads to data instability.   3. It is well known among users that turbine flowmeters are not suitable for installation in environments with strong vibrations; however, in situations where the magnetic field changes frequently, vortex flow sensors will produce signal outputs that are higher than normal. Practice has shown that in environments without gas flow, when a vortex flow sensor is placed in a changing magnetic field, at the moment of that magnetic field change the turbine flowmeter sensor generates an erroneous signal. Once the change ceases and the instrument is again in a stable magnetic field, it outputs a normal signal. 4. The instrument’s grounding wire does not meet the specified requirements, which allows 50Hz interference from high-voltage currents to enter. When the normal signal frequency is higher than 50Hz, a normal signal is output; otherwise, an incorrect signal is generated.   5. Inadequate tightening of wires during instrument wiring results in intermittent signals during transmission.   The solutions for faults in turbine flowmeters are as follows: 1. For metering systems that are in operation, the method of \"dual-track metering control\" can be used, along with the \"substitution method\", to identify and resolve faults in the operating metering instruments. Copyright reserved. 2. During the installation and connection of instruments, it is necessary to ensure accuracy at every stage, including site inspection prior to installation, wiring of the instruments during installation, and proper handling of system grounding wires. Copyright belongs to the engineering network, so as to ensure that accurate data is detected and can be output correctly. 3. Strengthen the management of data from the turbine flowmeter measurement system by setting up a scheduled printing function; analyze the operation of the instrument by using the printed data in conjunction with production conditions. 4. Regularly drain water from the pipelines, especially the water accumulated in the sections before the straight sections. Assign dedicated personnel to carry out this task on a regular basis, depending on the specific circumstances, in order to minimize the amount of water in the measurement sections and eliminate fluid pulsations as much as possible.   5. Regularly clean the instruments as a whole; if necessary, blow out the sensor parts of the instruments to prevent impurities from accumulating there. In cold seasons, installing heat tracing on the straight pipe sections and instrumentation also helps to reduce the accumulation of impurities at the measuring instruments.

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