For small diameterpipeline it is more difficult than for largediameterpipeline.
对于小管径管道，其通球难度要大于大管径管道。
2
Particularly, the drying technique of using dry air for largediameterpipeline was applied for the first time in our country.
尤其干空气干燥技术，开创了我国大口径输气管道干燥施工的先例。
3
But the pipeline thrust of largediameter is usually very big. The design form of anchors will influence the fabrication cost of the project and safe operation directly.