Can the heat-sealed water, used as instrument flushing water, be slightly opened to prevent freezing in winter?
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Thermosoldered water is used as flushing water for level gauges in gasification furnaces and wash towers, as well as for some high-pressure slag water flow meters. Since the pipelines do not have heat tracing, can the manual valves be slightly opened to prevent freezing in winter? Can it be adjusted without affecting the instrument readings? Does the normally open state cause any damage to the pressure sensing diaphragm of the instrument? Based on my experience, I personally feel that it’s difficult to maintain the readings shown on the gauge when it’s slightly open; I’d like to hear everyone’s opinions. Thank you all; if nothing else works, we’ll have to use steam tracing.
It would be better to keep using it all the time; it’s just a waste of some water.
We always turn it on when needed, fearing that the instructions might be inaccurate. Have there ever been any issues with incorrect instructions when it keeps being used?
It’s okay; a slight opening will not affect the liquid level indication
With this flushing water, the instrument operators adjust the flow and pressure on the positive and negative sides to similar levels, which prevents any impact on the liquid level indication and also helps to avoid blockages. Cut a piece, insert it and wait for stability; then compare the liquid level with that before insertion as well as with the liquid levels of the other two pieces. If there are no abnormalities, resume using this piece. Repeat this process for all three pieces of flushing water, and check the flow rate of each flushing water source regularly after insertion
It can be used; as for the method of using heat-sealing water, different organizations focus on different aspects, and thus the usage methods vary. Some organizations give priority to the accuracy of the instruments and use regular flushing; others focus on preventing blockages and therefore employ continuous flushing with a low flow rate. If regular flushing is used, then during winter (in the colder regions of the north), for anti-freezing purposes, it is advisable to switch to a continuous flushing mode with a low flow rate. This approach has a slight impact on the accuracy of the instruments, but not significantly; it remains within an acceptable range. After switching to a continuous low-flow flushing mode, water expansion in the system occurs; therefore, the amount of wastewater discharged must also be increased accordingly to balance this water expansion