Corrosion in the boiler feedwater second preheater outlet line
Thread Content
What are the common causes of corrosion in the outlet pipeline of the second preheater for the company’s boiler feedwater?
It could be CO2 or carbonate corrosion; to determine the exact type of corrosion, it’s necessary to examine the pattern of corrosion. What material was chosen? . Carbon steel and low-alloy steel have poor resistance to CO2 corrosion, while austenitic stainless steels exhibit good resistance; it is advisable to use low-carbon austenitic stainless steels such as 304L or 316L.
Check whether there are any issues with the quality of the boiler water; in the case of stainless steel, there may be risks of chloride stress corrosion, alkali corrosion, acid corrosion, and so on!
Check your deoxygenated water to see if it meets the standards
Management layer or shell layer? In the pipeline layers where medium-pressure gas flows, the acidic water that condenses is corrosive; therefore, stainless steel grades 316 or 321 are generally used