| 摘要 |
Joints or other discontinuities in a live gas pipeline are sealed by attaching an insertion duct to the exterior of the pipeline, inserting a spraying device into the pipeline through the insertion duct, mechanically orienting the spraying device adjacent the joint or other discontinuity and spraying a coating material onto the interior surface of the pipeline wherein the coating material may be applied and will cure in the presence of pressurized flowing gas.
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