Questions about the level gauge.
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The current issue is a problem with the level gauge used in one of the return tanks, and it’s quite troublesome. Specifically, the magnetic flap level gauge used in that tank always shows readings that don’t match those from the remote monitoring system; the remote system uses an electric float level gauge, but its accuracy isn’t certain either. We discussed this matter for a long time with the process engineers, and we conducted another test today: we removed the material from inside the tank and placed it in a measuring cylinder, then put the float from the magnetic flap level gauge into that cylinder – it managed to float right at the middle level. But when we put it back into the tank, it wouldn’t float at all. Parameters: Hydrogenation oil (density 0.8) and a mixture of hydrogen sulfide and water (density 0.9); the specific gravity of the medium ranges from 0.58 to 1.0, and the pressure is between 0.3 and 0.5. Is it necessary to replace the magnetic flap? It seems that this setup does not fully meet the requirements of the process. Can it be replaced with a (glass plate level gauge, K-TEK)? I will keep following up on this issue; I hope everyone can help analyze it
Replace with a two-color glass plate level gauge
This should be the water cut interface, that is, the oil/water boundary, with densities of approximately 0.8/1 respectively. Please check the ordering specifications for the magnetic float to see if it specifies “interface measurement”? Should the densities of oil/water be specified? Many cases are due to the reasons mentioned above, which lead to inaccurate measurements, or deviations in the operation density compared to what was specified during ordering.
When measuring interfacial positions, the stratification effect between the heavy components and the light components must be taken into account. In the case of external-type instruments, since such devices usually have only two connection tubes, one at the top and one at the bottom, this may affect the stratification effect； Based on what you’ve said, the level of the recombination liquid should be low. If possible, could the equipment be tested first with water to simulate the material, in order to see what the difference is in the measurement ranges between the electric float level gauge and the magnetic flap level gauge, and whether their zero points are at the same level? My skills are limited; please forgive any mistakes.