In the long-term use of natural gas long-distance
steel pipelines, during the long-term operation of the two-phase flow pipeline, there will be liquid accumulation in the pipeline and corrosion of the inner wall. These liquids will accumulate at the low points of the pipeline, increasing the pressure drop of the pipeline. High, reducing the flow area in the pipeline, and the efficiency of transporting natural gas will also be reduced.
The factors that affect the pigging effect in the two-phase flow pipeline are the flow rate and pressure drop of the gas-liquid mixture in the gas pipeline; the gas-liquid ratio in the pipeline, the shape of the longitudinal section of the pipeline; The amount of accumulated liquid; the size of the plug trap; in offshore pipeline systems, the height between the bottom of the riser and the plug trap.
The commonly used pigging method for pipelines with the two-phase flow is to use general pigging balls and pigs for processing, and pigs with bypass can also be used for pigging processing.
