Which of liquid ammonia, ammonia water, and urea is corrosive to stainless steel? Which type of pressure gauge – a diaphragm pressure gauge or a regular stainless steel pressure gauge – is required?
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Which of liquid ammonia, ammonia water, and urea is corrosive to stainless steel? Which type of pressure gauge – a diaphragm pressure gauge or a regular stainless steel pressure gauge – should be used? Let the experts from various fields share their opinions.
Ammonia is corrosive to stainless steel; should a diaphragm pressure gauge or a regular stainless steel pressure gauge be used for it?
Ammonia corrosion depends mainly on temperature; in general, stainless steel is suitable for this purpose. If the medium contains solid particles, a diaphragm-type gauge should be used, whereas in cases where there are no such particles, a regular stainless steel pressure gauge made of 316L will suffice
There are many types of stainless steel; taking the most common type, 304L, as an example, the corrosion rate of 304L by dry ammonia and ammonia solutions remains low at temperatures below 100°C, at less than 0.05 mm/year. The relevant data can be found in the \"Corrosion Data and Material Selection Manual\", compiled by Zuo Jingyi, published by Beijing Chemical Industry Press. Or you could just ask the watch manufacturer. A few days ago I received information from an American manufacturer; they have now introduced new watches made of ultra-corrosion-resistant alloys, watches with polytetrafluoroethylene rings to prevent contamination, and watches featuring complex diaphragms for safe backwashing. It’s really informative to learn about these things