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Failure analysis and maintenance of gas turbine flowmeter

   Failure analysis and maintenance of gas turbine flowmeter

Gas turbine flowmeters have excellent low- and high-pressure metering performance, multiple signal output methods, and low sensitivity to fluid disturbances. Due to the influence of various factors, gas turbine flowmeters still have some problems in the actual application process. Common problems are: no signal, slow and fast running speed, eddy flow is not counted, accuracy is reduced, and the flow does not match the actual flow, etc. In response to the above issues, the following suggestions can be made:
·对于无信号的情况要先检查电源,检查电源没问题后再对涡轮流量计本身进行检查,并判断是一次仪表还是二次仪表的故障,如果二次仪表没有问题则检查信号线是否正确连接,如果仍然无信号输出,也有可能是流体的流速太慢或者传感器出现了问题导致检测不到信号。 1 · For the case of no signal, check the power supply first, check the turbine flowmeter itself after checking that the power supply is OK, and determine whether the primary meter or the secondary meter is faulty. If there is no problem with the secondary meter, check whether the signal line is correct. If there is still no signal output, it is also possible that the flow rate of the fluid is too slow or that there is a problem with the sensor and no signal is detected.
·对于运转速度忽慢忽快的情况,首先可以通过调整仪表系数来控制速度,如果仪表系数变化较大也可以检查插入杆深度是否恰当,大多数情况下是由于叶轮无法运转,流量计内部含有污物可以使用盐酸来清洗污物。 2 · For the situation where the running speed is slow or fast, you can first control the speed by adjusting the meter coefficient. If the meter coefficient changes greatly, you can also check whether the depth of the insertion rod is appropriate. In most cases, it is because the impeller cannot run. Contaminants can be cleaned using hydrochloric acid.
·对于涡轮流量计不计数的情况可能是由于电源或者开关接触不良导致的,所以要对涡轮流量计内部的器件进行检查,检查各个部件是否出现故障,如果出现了故障要及时修理或更换零件。 3 · For the case where the turbine flowmeter does not count, it may be caused by poor contact of the power supply or the switch. Therefore, check the internal components of the turbine flowmeter to check whether each component is faulty. If a fault occurs, repair or replace the parts in time. .
·作为速度式流量计随着运行时间的增加内部轴承会逐渐磨损,容易造成叶轮转速变慢,计量负偏差增大从而引起计量偏少的现象,对大流量的计量影响尤为突出。 4 · As a speed-type flowmeter, the internal bearings will gradually wear out with the increase of the running time, which will easily cause the impeller speed to slow down, and the negative measurement deviation will increase, which will cause the phenomenon of less measurement. The effect on the measurement of large flow is particularly prominent. Suggested ways of improvement: Actively communicate with manufacturers and agents to carry out targeted maintenance or simply replace bearings regularly.
·考虑到在具体生产中,常常会遇到设计流量与实际流量不匹配的问题:要么设计流量过大,起步流量高,投产后造成小流量时不能正常计量甚至不计量问题的发生,需要在仪表选型前,充分掌握下游用气单位及用气设备的负荷情况,考虑到相关的影响因素;同时运行中随着用气情况的变化对计量表也要作相应调整。 5 · Considering that in specific production, often the design flow does not match the actual flow: either the design flow is too large, the starting flow is high, and the small flow may not be properly metered or even non-metered when it is put into production. Before selecting the instrument, fully grasp the load of the downstream gas-consuming units and gas-consuming equipment, taking into account the relevant influencing factors; at the same time, the meter should be adjusted accordingly as the gas-using situation changes during operation. These are also an important means for controlling the transmission difference.

Gas turbine flow meter use and maintenance recommendations:

·气体涡轮流量计投用前,通过流量计算机的控制面板完成仪表系数的重新设定。 1 Before the gas turbine flowmeter is put into operation, reset the instrument coefficient through the control panel of the flow computer.
·气体涡轮流量计投运时,其前后压差不能过大,气体流速不能过快,应缓慢地手动开启入口阀门,待管道完全充满天然气且压力平衡后手动开启出口阀门,以防止发生冰堵和瞬间气流冲击而损坏涡轮。 2 · When the gas turbine flow meter is put into operation, the pressure difference between the front and back cannot be too large, and the gas flow rate cannot be too fast. Manually open the inlet valve slowly. After the pipeline is completely filled with natural gas and the pressure is balanced, manually open the outlet valve to prevent ice from occurring. Plugging and momentary airflow shocks damage the turbine.
·定期对涡轮流量计进行清洗、检查和复校,定期注入润滑油,以维持叶轮良好运行;关注流量计算机的流量显示状况,评估流量情况,有异常时立即检查。 3 · Regularly clean, check and recheck the turbine flowmeter, and regularly inject lubricating oil to keep the impeller running well; pay attention to the flow display status of the flow computer, evaluate the flow condition, and check immediately if there is an abnormality.
·保持管路畅通。 4 · Keep the pipeline open. You can determine whether the filter is blocked according to the differential pressure value of the differential pressure transmitter at the inlet and outlet of the filter. When the natural gas turbine flowmeter operates abnormally, the pipeline should be cleaned. After the turbine of the flowmeter is removed, it should be thoroughly cleaned with light high-grade gasoline and then reinstalled.

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