I would like to ask why this capillary level gauge is installed in this way; there are pictures available
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This post was last edited by lww012800 on 2019-12-26 at 17:24. As shown in the diagram, gaseous propylene is cooled to a liquid state before entering the storage tank. A capillary tube is used as the level sensor for LT; but how should it be installed? The diagram I drew is identical to the original PID diagram.
Bro, the profile picture is the university entrance – that’s not the important thing
That wire should be a signal line, not a capillary, right?
I checked the legend; it’s a capillary, and the signal line is also incorrect
This diagram should be a PFD; there should be instruments associated with the tank LT at the heat exchanger. My guess is it’s a flow meter.
I’m looking at the PID; I’ve checked it repeatedly
You’d better take a look and check the diagram instructions to see what this section of wire represents. This is indeed a representation of the signal wire of a gauge, not some kind of tube. If it really is a pipe, its actual installation location isn’t like this either. View the symbol instructions. For reference.
This diagram is still missing a lot of things; this wire should be connected to a control valve for it to make sense. The feed rate is controlled based on the liquid level height. (Guess) For reference only.
A single diagram can convey a lot of information; it is recommended to study HG20505 and the instrument installation manuals on your own
This post was last edited by qugd on 2019-12-26 at 17:17. There’s nothing wrong with this image. The capillary acts as a pressure conductor; it converts the pressure of the incoming fluid into the gas phase pressure at the upper part of the storage tank (the actual value is slightly higher). The high-pressure side of the level gauge is connected to the liquid phase area of the storage tank, so the pressure on the high-pressure side of the level gauge equals the gas phase pressure plus the pressure at a specific liquid level. The resulting differential pressure represents the pressure at that specific liquid level, which can then be converted into a liquid level reading. The incoming propane is liquefied in a cooler, and the resulting liquid propane can enter the storage tank on its own due to the vapor pressure and the relatively high liquid column pressure in the pipeline.