How to prevent corrosion of feed water pumps
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To prevent corrosion of the feed water pump, efforts should primarily be focused on deoxygenating the feed water, adjusting its pH value, and improving the material used for the pump. The specific measures are as follows: (l) Ensure the proper operation of the thermal deaerator to improve deoxygenation efficiency, and combine this with the addition of hydrazine to the feedwater in order to completely eliminate any residual dissolved oxygen in it. (2) Select the feed pump material appropriately. The guide vanes and impellers of the feed water pump are made of corrosion-resistant materials such as chromium steel (2Cr13) and stainless steel (lCr18Ni9Ti). (3) Stabilize the quality of the supply water and carry out ammonification treatment to raise the feedwater pH value to the range of 8.5–9.2. (4) Prevent air from entering the pump or avoid phenomena such as water vaporization, so as to prevent cavitation
The original poster has covered everything very comprehensively. It is important to ensure that the pH of the feed water is between 8.8 and 9.3 in practical applications. Once the material is determined, there is little room for change. Demineralized water causes significant corrosion to carbon steel.
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