The liquid level in the butadiene horizontal tank does not match the actual mass; how to correct this?
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The liquid level in a butadiene horizontal tank does not match the actual mass – how to correct this? I would appreciate it if some expert could provide guidance: with the existing volume parameters of the tank, the use of radar level gauges and float level gauges for measuring the level results in inaccurate calculations of the inventory level
The description is not detailed; it’s unclear exactly what is inaccurate, and the calculation basis or conditions for each measurement method are not specified, making it impossible to determine
Regarding measurement issues, the zero point of the radar or differential pressure diaphragm must be calibrated； Because it does not exactly match the liquid level calculation formula for the tank volume. Therefore, when conditions permit, water is used to calibrate the zero points of each level gauge so that they correspond to the calculated liquid level in the tank when it is empty. It should also be noted that in the case of a differential diaphragm level gauge installed at the bottom of a tank, even a small amount of water or TBC entering the pipe connection can affect the measurement results.
The diameter, out-of-roundness, and level of installation of horizontal tanks can all have variations, and calculating the amount of material stored based on the liquid level in such tanks is less accurate compared to tall and narrow vertical tanks. If an accurate estimation of the amount of material stored is desired based on the liquid level, it is first necessary to calibrate the horizontal tank using water in order to create a table showing the relationship between different liquid levels and the corresponding volume of material stored. This table can then be used, together with the storage temperature and density of butadiene, to estimate the amount of butadiene present.
I want to calculate the amount of butadiene used; how can I do this more accurately? The existing metering tank (which is equipped with a level gauge) also has the corresponding temperature-density data available
This is so complicated. How can we accurately calculate the consumption? The existing equipment is a butadiene metering tank equipped with a level gauge; how can we achieve accurate measurement of the consumption?
The table showing the relationship between liquid level and volume needs to be calibrated regularly; if it is a metering tank used for trade settlements, it must be calibrated by a qualified metrology department, which will then provide the corresponding table. As the tank’s shape and volume may undergo unpredictable changes over time, which leads to measurement errors, it is necessary to calibrate it at regular intervals before using it for measurement purposes.
1. Add a mass flow meter to the discharge pipeline of the metering tank. 2. Install an online weighing system in the metering tank (issue: metal hoses cannot be used in the butadiene pipeline at present). 3. Use water to calibrate the metering tank, and use the data from a radar level gauge to serve as a basis for measuring butadiene in the future (diaphragm gauges require density conversion, and float level gauges may also exhibit inconsistencies in their zero-point readings due to the difference in density between water and butadiene). The above are suggestions for reference only