I would like to ask what causes the magnetic flap level gauge to indicate no water level
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When a magnetic flap level gauge for a heat exchanger is in use, the steam side cannot be opened fully; it can only be opened to a certain extent. If it is opened fully, the magnetic float will be pressed against the bottom, preventing it from floating, and the water level will be displayed as zero. However, the water side can be opened fully. Why is this? Urgent! ! ! ! ! ! ! ! ! !
It has been confirmed that the float ball is not damaged, and there are no issues with the pipelines on the water side or the steam side. Has anyone encountered this situation before?
Do you mean steam by \"gas\"? If so, as the temperature of the medium rises its density decreases; at this point the specific gravity of the float becomes much greater than that of the medium at that temperature, so it can no longer float
It’s steam; it’s a soda heat exchanger. But we specified requirements when ordering the magnetic flap, so this kind of error shouldn’t occur.
This post was last edited by command123 on 2011-12-31 at 12:20. As a test, open the root valves at both the top and bottom of the level gauge. Once you see the float reach the bottom, close those root valves again. Then open the drain valve of the level gauge and use a bucket to collect the liquid, so as to estimate the current liquid level.
Check whether your heat exchanger was selected with an oversized size or if the steam temperature is too high. When the gas-phase valve is fully open, this leads to a high temperature inside the float chamber, resulting in a decrease in the density of the fluid; as a result, the float cannot rise. It is recommended to try using a float with a lower density
Ask the manufacturer to make you a new float with a lower specific gravity. This cannot be blamed on the manufacturer; if the temperature of the medium being measured varies greatly, then if the density is calculated based on the elevated temperature, the liquid level measured at the original temperature will be higher than it actually is. For now, only a float with a lower specific gravity can be used; the float will remain afloat when the temperature rises, but the issue of a higher liquid level in the absence of temperature increase must be ignored.
In my opinion, the temperature is high and the density is low, but not that low. The lower part is connected to the heat exchanger; even if vaporization occurs quickly, according to the principle of continuity, the liquid level inside the measurement tube should always remain the same as that in the container. Thus, the liquid level persists at that level, and whenever the density becomes lighter, denser fluid comes in to replace it. It’s just my personal opinion; you could conduct a pressure test on the float. 1. The float is noisy. 2. The other technical specifications of the float do not meet the requirements. 3. The pressure inside the container is too high. If nothing else works, use a glass plate
It seems that the float isn’t the problem. Currently, with both the upper and lower valves fully open, the drain valve releases steam only and no water; however, water flows out when the upper valve is closed. Is it possible for a magnetic flap to experience a situation where the pressure difference between the upper and lower sides is so large that the float cannot rise? However, the pressure difference inside a heat exchanger shouldn’t be that great, right?
It is caused by an inaccurate density of the floating ball; the main reason is likely errors in the pressure and temperature parameters of the medium specified during order placement compared to the actual values. It is recommended to have the manufacturer replace the floating ball with one having a lower density. If accurate data cannot be provided, stainless steel counterweight bolts can be used beneath the floating ball, and the weight can be adjusted by tightening or loosening the nuts – this method works well and is worth trying.
If without remote transmission, it’s better to switch to a glass plate