管道投产前必须进行通球，以清除管内杂物。
There is necessary to carry out ball through pipeline before commissioning to cleaning remains in construction in pipeline.
对于小管径管道，其通球难度要大于大管径管道。
For small diameter pipeline it is more difficult than for large diameter pipeline.
介绍了小管径管道通球时卡球和解卡过程，还对水平管卡球原因进行了分析。
The paper made an introduction of ball through and process of bockage solution for small-diameter pipeline, and explanation of blockage in horizontal pipeline.
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