Risk Analysis Of Pig Scraper Operation！
Risk analysis and countermeasures for pig operation
Pig Scraper jamming
Pig Scraper jamming is a serious problem that may occur during pigging. If it is not serious, it will cause the interruption of the oil transportation process. In severe cases, it may cause an abnormal increase in pipeline pressure. This may even lead to serious problems such as pipe leakage. There are various reasons for pig jamming.
In general, it mainly focuses on the following aspects:
The pipe tee is not provided with a bar. The pig is gradient when passing through the tee. This may cause jamming.
The pipeline has severe deformation. This makes it impossible for the pig to pass smoothly, resulting in jamming;
The valve on the main pipeline is not fully opened during ball passing. It is easy to cause pig jamming;
There are large foreign matters in the pipeline that make the pig unable to pass smoothly, causing foreign matters to jam;
There are too many impurities such as oil sludge and wax block in the pipeline. The pig has blockage due to slow sedimentation during pigging.
From the change in pipeline pressure, there are two phenomena of pig jamming.
One is the obvious change of pipeline pressure. The pressure of the service station continues to rise during the pass. The pressure of the receiving station drops obviously or remains unchanged. Finally, the pressure at the service station suddenly rebounded. It indicates that the pig has a blockage at a certain position.
The other is that the change of pipe pressure is not obvious. This is because the pig cup is damaged or blocked by foreign matters. In the process of tracking the pig, we can find that the pig has not reached the predetermined position for a long time. This requires the tracking device to locate the stuck position of the pig. To reduce the risk of pig jamming. Therefore, before pigging, check the early plugging position. This ensures that the blanking plate is normal. Attention shall be paid during ball passing.
