Issues in selecting level gauges
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Dear sea friends, a level gauge needs to be selected for the acidic gas gas-liquid separator. How many level gauges would be appropriate? Is both remote transmission and local display required? Can a magnetic flap with remote transmission be used? Are both level alarms and interlocks necessary? What type of valve is suitable for the liquid discharge port at the lower end of the separator? A manual stop valve? Manual remote control regulating valve? Or an automatic control valve? Pressure: 0.08 MPA, Temperature: 25 degrees, Medium: Acidic gas treated with low-temperature methanol wash
I’ve said so much, but what I’m actually referring to are field instruments, distributed control systems, and local instruments. These depend on what type of control is used in your entire system, to determine which instruments to choose.
We can monitor the liquid level online here, which is very different from traditional level gauges; you might want to take a look
Reply to 2# Egret Shoal: Isn’t that right? The type of instrument chosen is related to the process requirements, right? I can’t just use automatic control in every position just because this is a DCS control system, right?
RF admittance level gauges can be used; as for whether local display is necessary, it depends on any requirements specified in the process. An automatically regulating valve (with a bypass) is usually installed at the outlet of the gas-liquid separator, and it is connected to the level gauge to regulate the liquid level.
Here, for important liquid levels, we generally use one radio frequency admittance gauge, along with a magnetic flap gauge that also has a remote transmission function. The radio frequency admittance gauge is connected to the automatic control valve, while the remote signal from the magnetic flap gauge serves as a reference signal. When there is a significant difference between the readings of these two gauges, it is necessary to inspect the instruments on site. Given that the pressure mentioned by the original poster is not high, it might be possible to use a glass plate level gauge along with a magnetic flap gauge with remote transmission – this approach is intuitive and costs less
Reply to 6# cuiyan1002: Well, as we originally planned, it’s a glass panel plus a magnetic flip switch with remote transmission