Risk analysis and countermeasures of pipeline body!
2.1 Pipeline oil leakage
Pipeline oil leakage is a serious risk during pigging. Although there are various reasons for pipeline oil leakage. But generally speaking, it mainly includes the following two aspects:
First, after long-term corrosion of the pipe body, there are thin parts in the severely corroded parts. The thin part of pipe wall may be broken during ball passing. There is also a risk of oil leakage from the pipeline.
Second, it is assumed that the pig is blocked during ball passing. This may cause a transient increase in line pressure. It may then lead to the risk of rupture and oil leakage at the thin pipe wall. When an oil leakage accident occurs, the first thing to do is to determine the cause of the pipeline oil leakage. If its main reason is a Pig Scraper. Then we refer to the measures for handling pig blockage for emergency disposal. If it is confirmed that the pipeline leakage is not caused by pig blockage. Then the oil transportation dispatcher shall timely inform the on-site tracking personnel of the current oil transportation parameters. The pig tracking group locates the pig. The on-site cooperation personnel shall timely confirm the location of oil leakage in the pipeline. The rescue team shall timely develop emergency rescue work.
2.2 Lack of pipeline crossing support strength
When the Pig Scraper passes through the pipeline crossing section, it is likely to resonate with the pipeline and cause the risk of lack of pipeline support strength, which may lead to problems of the effective pipeline crossing section support and leakage at the thin pipe wall. In order to avoid this kind of situation, before pigging, the pipeline operation unit shall check the crossing parts of the pipeline, and add support to the unqualified pipeline section to ensure that the support strength meets the pigging requirements. During pigging, the pipeline operation unit shall arrange personnel to focus on monitoring the pipeline crossings, especially the locations prone to risks, and increase the density of on-site patrol personnel if necessary. The ball tracking personnel shall confirm the passing status of the pig at the crossing of the pipeline in time to ensure the smooth passing of the pig.
2.3 Secondary hazards caused by pipeline leakage in high-risk areas.
For pipelines crossing densely populated areas, rivers and lakes, water bodies, railways, highways, and other transportation facilities, pipe blockage and pipeline leakage may cause secondary hazards in the above areas. Therefore, pigging is developing. We shall formulate detailed countermeasures against possible hazards. Make a disposal plan for dangerous points. The station shall increase the frequency of line patrol during pigging. In case of Pig Scraper blockage and pipeline leakage in the above areas. We should start the corresponding emergency plan in time.
