The investigation of pipeline corrosion early found that pipeline corrosion is of great significance. At this time, the degree of corrosion is light, and it is easy to be controlled, otherwise, it will cost a lot of money to repair the severely corroded pipeline.
The cost of early investigation of the degree of corrosion inside the pipeline is only a small part of the cost of pipeline repair.
Hydrogen sulfide corrosion usually occurs in the following locations in the sewage collection system: (1) where the slope of the pipeline is small, the flow speed is slow, and the residence time is long; (2) the inspection well; (3) the outlet of the sewage pressure trunk; ) Intense turbulence. When determining the location of pipelines that may be corroded, we should focus on collecting and updating the sewage pipe network maps of areas where residents complain of hydrogen sulfide interference, and sort out the TV test reports and maintenance records of pipelines in these areas.
Mark the location of possible corrosion on the pipe network diagram for further investigation and analysis. The preliminary investigation of the corrosion status should be carried out on the pipeline Tv detection and analysis where it may be corroded. Before entering a pipeline or inspection well, personnel must take safety precautions to prevent hydrogen sulfide gas poisoning.
The pH value of the pipe wall above the water level of the pipe is one of the important indicators reflecting the corrosion status. The easiest way to check the PH value is to use pH test paper.
Generally, the pH value of the wall of the new concrete pipe above the water level is 10-11. If the pipeline is not corroded, the pH will drop to around 7 after years of use.
In general, a pH value below 4 indicates corrosion.
The content of hydrogen sulfide gas in the atmosphere and the concentration of sulfide in sewage are also indicators that cannot be ignored in corrosion investigations. The above indicators can be listed in a table for further analysis.
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