Turbine flowmeter common faults and how to solve

Common faults of turbine flowmeters and how to solve them:

1) Turbine flowmeters are not suitable for installation in strong vibrations. It is widely known to the application. However, in the case of frequent changes in the magnetic field, the vortex flow sensor will measure the signal output higher than the normal value. Practice has proved that in the field without gas flow, when the vortex flow sensor is in a changing magnetic field, the turbine flow meter sensor will induce an error signal and output when the magnetic field changes. When the change is over, the meter is in a stable magnetic field. The meter will output a normal signal.

2) Coke oven gas has high temperature and high humidity at the time of shipment, so moisture will exist during gas transportation. The gas flow causes the water to oscillate back and forth, thereby forming a pulsating flow. When the vortex flow sensor is in this fluid state, the output data suddenly becomes too small to reflect the production status.

3) Since the coke oven gas is rich in impurities, it is easy to crystallize, and impurities are condensed on the sensing head, thereby causing measurement misalignment. When the temperature rises, the impurities volatilize, the sensitivity increases, and the signal increases; on the contrary, it decreases. This causes data instability.

4) During the wiring process of the instrument, the pressure line is not real, which causes the signal to be intermittent during transmission.

5) The instrument grounding wire does not meet the specification requirements, so that the 50Hz interference in the strong electricity enters. When the normal signal is higher than 50Hz, the normal signal is output, otherwise the error signal is output.

Solution:

1) During the installation and connection process of the instrument, ensure that each link is accurate, including the inspection of the site before installation, the wiring of the instrument during the installation process, the grounding line of the system, etc., to ensure the authenticity is detected. Data and accurate output.

2) For the running metering system, the method of “two-track metering control engineering network copyright, comparison confirmation” and “alternative method” can be used to confirm and eliminate the fault of the meter in operation.

3) Periodically clean the meter as a whole, and if necessary, purge the sensor head part of the meter to avoid condensation of impurities at the sensor head. In the cold season, the addition of a heat tracing device to the metering straight pipe section and the meter section is also advantageous for alleviating the condensation of impurities at the metering gauge.

4) Drain the pipeline regularly, especially the water before the straight pipe section. Set the special person to discharge regularly according to the specific conditions, reduce the moisture in the measuring pipe section as much as possible, and eliminate the pulsation in the fluid to the utmost extent.

5) Strengthen the management of the metering system data of the turbine flowmeter, set the timing printing function, and analyze the operation of the meter according to the printing data combined with the production status.