Acidic water testing items
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The last edit to this post was made by sxf1028102800 on 2019-1-8 at 21:34. For the sampling and analysis of acidic water in our facility, why is it necessary to measure the pH level and the iron content? What is the purpose of testing for iron? I see that the iron level detected in our facility is 2.3 mg/l. Please everyone share your thoughts
Testing the iron content serves as a basis for determining the corrosion rate of heat exchange equipment; the higher the iron content, the more severe the corrosion in the heat exchangers and pipes. It has a slightly higher iron content of 2.3. You may consider optimizing the water volume used for washing your equipment and the amount of corrosion inhibitor applied. Furthermore, the device now uses corrosion probes to collect detection data from critical areas, which is more reliable than data obtained from acidic water. Personal opinion
Testing the iron content is done to determine whether corrosion has occurred, as acidic water is corrosive. Even if the material in contact with acidic water is acid-resistant, it is not completely immune to corrosion; therefore, testing is still necessary
Acidic water is usually slightly alkaline, as ammonia or alkanolamines are added to it to absorb the acidic hydrogen sulfide gas generated during the processing process. The presence of trace amounts of iron in the system indicates that acidic water has carried away the products of iron corrosion; a low pH levels increase corrosivity.
We used to conduct iron content tests frequently in the past, mainly to check the corrosion level of the equipment; depending on the situation, corrosion inhibitors such as ammonia or alcohol amine would be added. This is also one of the three types of injections used in catalytic fractionation towers.
Acidic water should be referred to as alkaline sulfur-containing wastewater; the total iron content in the water indicates the degree of corrosion of the equipment located before the sampling point, and you can use this data to calculate the amount of iron lost from the equipment