Reasons for redness at medium, low, and very low water levels
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Our plant uses a fixed-bed batch gas production process, with medium-low-pressure shift reaction; the semi-water gas from this process passes through a wire mesh oil remover before entering the saturation tower. Recently, it was observed that the water in the saturation tower level gauge turned red; the discharge volume was slightly above normal, but this phenomenon occurred repeatedly, causing the glass of the level gauge to turn red. The water in the hot water tower has not changed; the make-up water is brine. Analyze oil ingress or sulfur corrosion. Right?
You might as well test it – the pH level of your hot water is surely very low. It’s an issue of acidic corrosion; the pH level needs to be increased to ensure it remains between 7 and 9.
Check again whether the chloride ions and total solid content in the hot water exceed the limits. Consider whether a saturated hot water tower will experience localized corrosion (under normal conditions).
It is very likely that the medium-temperature shift catalyst has pulverized and was carried into the hot water system along with the shift gas. Isn’t the glass of a level gauge unsafe? It’s better to use magnetic flip plates.