Concrete failure analysis of mass flowmeter about zero drift

In this article, the editor will take you to talk about the case of zero drift failure analysis of mass flow meters. I believe everyone has a familiar understanding of mass flow meters. Of course, the first thing to understand is the working principle of mass flow meters. For the different working principles and properties of flow meters, according to the medium measured by the installed environment, zhunque's analysis of mass flow meters Specific cases of analysis failures about zero drift. 1. Failure phenomenon of mass flow meter The LPG of Company A was shipped from the port through the port berth. Two mass flow meters in liquid phase and gas phase were installed at the port berth for LPG delivery measurement. The ship reported that the company’s LPG volume was deviation. 2. Analysis of the failure causes of the mass flowmeter The liquid phase mass flowmeter for measuring liquefied petroleum gas is JKRSL type, and a backpressure valve is installed at the outlet of the mass flowmeter. By controlling the backpressure of the mass flowmeter, that is, the outlet pressure, the backpressure of the flowmeter is guaranteed to be high. To avoid the vaporization of liquefied petroleum gas in the pipeline, the control pressure should be adjusted according to the change of the external ambient temperature and the change of the saturated vapor pressure of the medium. At the same time, considering that the liquefied petroleum gas will be vaporized in the cabin during the loading process, which will lead to an increase in the cabin pressure and a decrease in the loading flow, so the gas phase in the cabin must be depressurized. In order to avoid the loss of liquefied petroleum gas and pollute the environment, under the premise that some ships cannot handle it by themselves, the gas pipeline is returned to the company's spherical tank through pressure relief. For JKRSL's gas-phase mass flowmeter, the actual shipment volume is the difference between the liquid-phase flowmeter and the gas-phase flowmeter. In order to ensure the accuracy of metering, the batch controller realizes the quantitative control function, the pulse amount accumulation of the loading amount and the system logic control function, the control valve opening is continuously controlled, according to the static overflow signal, fluid pressure and flow, flow rate The interlock control is realized by the diagnosis state of the meter to ensure the safety of the loading process. The reasons for the decrease in the total amount of liquefied petroleum gas are analyzed. Since liquefied petroleum gas is easy to gasify, first check the back pressure valve of the liquid phase. The pressure of the medium in the pipeline is higher than the saturated vapor pressure, and there is no gasification to form a gas-liquid two-phase mixture. It will cause the mass flow meter to measure inaccurately; then it is inferred that it is the zero point drift of the liquid and gas phase mass flow meters. When the next batch of B ships docks to ship LPG, the company will organize relevant personnel to find the cause. Focus on checking the zero position of the mass flowmeter. It can be seen that the zero-point change of the liquid-phase flowmeter is caused by the change of the environmental temperature and other factors, which causes the handover measurement of the flowmeter to be too large by 0.54%. Also check the zero position of the gas flow meter, and the zero position is normal. 3. The solution to the failure of the mass flowmeter By adjusting the zero position of the liquid flowmeter, changing the reading method of the flowmeter, and preventing the pressure and density of liquefied petroleum gas from fluctuating as much as possible when the berth is required to operate, the company and the ship The measurement and comparison data of two consecutive shipments are as follows: (1) The measurement data of ship C is 773t, the measurement data of flowmeter handover is 774t, the difference is 1t, and the error is 0.13%; (2) The measurement data of ship D is 0.13%; It is 1532.8t, the flowmeter data is 1534t, the difference is 1.2t, and the error is 0.078%; through the comparison of the above two ship loading data, the error has reached the expected effect. The above content is for the specific failure analysis of the zero drift of the mass flowmeter. There are more news and information. Welcome to log in (Kaidi) to the company's official website at any time to obtain more flowmeter knowledge.

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