| 摘要 |
Replacing a section of a pipeline by indenting the pipeline from the outside to provide a stop shoulder on the inside adjacent the section to be replaced. Positioning and securing an anchoring and seal pig in the pipeline against the stop shoulder, removing the section of the pipeline to be replaced including the stop shoulder, replacing a new section, and releasing and removing the anchoring and seal pig in order to provide space for the replacement section. A part of the anchoring and seal pig is removed prior to replacing a new section. |
