What should be done regarding the severe corrosion within the circulating water pipeline due to prolonged shutdown?
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What should be done regarding the severe corrosion within the circulating water pipeline due to prolonged shutdown?
1. At the beginning of operation of the device, it is recommended to carry out passivation treatment on the circulating water system. An oxide layer is formed inside the circulating water line to reduce corrosion ； 2. If the system is not in use for an extended period, it is recommended to drain the circulating water pipes (those within the device). After draining, the system should be protected with nitrogen; operating such a system is difficult, after all, as it involves buried pipes. 3. Although the circulating water pipeline does not carry hazardous materials, severe corrosion of the pipeline poses a potential risk to the installation. The buried pipes in many plant areas are difficult to handle, so it is recommended that the building owner pay attention to the issue of corrosion in the circulating water.
Given your current situation, it’s likely that you’ll need to replace the circulation water pipes again! This is the consequence of inadequate regular maintenance! ! ! ! ! ! ! ! !
Pre-film treatment of circulating water yields better results!
Regardless of the type of process pipeline, if it is not in use for an extended period of time, it should be protected using gases such as nitrogen; otherwise, corrosion will be severe and the pipeline will end up being unusable over time.
This post was last edited by Wang Shui on 2015-7-17 at 15:10. We have a set of equipment that remains idle for long periods of time. I observed a phenomenon: during the first period of inactivity, which lasted about a year, we drained the water accumulated inside as recommended to prevent rusting, but we did not introduce nitrogen gas. As a result, the pipes were severely corroded. The second shutdown also lasted a year; having learned from the previous experience, no water was drained. After restarting the system, the pipes were inspected and found to be in good condition. I think that under normal circumstances, since the pipes have undergone a pre-coating treatment, there should be no problems as long as they remain filled with water for an extended period of time, provided that air is not allowed to get in.
If there is no nitrogen, are there other ways?
It is recommended to purge the pipeline with nitrogen and maintain it under a nitrogen atmosphere.
Drain at the lowest point, under nitrogen protection, or with the pipeline filled with water; perform passivation treatment