| 摘要 |
An inflatable gas pipeline stopper is provided for stopping gas from flowing through a broken gas pipeline while effecting repairs of the gas pipeline. The invention includes an elongated cylindrical stopper housing for attachment to a gas pipeline in an air tight engagement which may be accomplished through a commercially available drilling and tapping machine and by an air tight clamp assembly. Within the stopper housing extend a pair of moveable bag inserting and retracting plunger assemblies including rigid air pipes which are attached to an air source at the upper ends thereof and to inflatable air bags at the bottom ends thereof. The moveable bag inserting and retracting plunger assemblies including the rigid air pipes are inserted through the stopper housing to extend into the gas pipeline, such that one air bag is pointed in an upstream direction within the gas pipeline and the other air bag is directed to a downstream location of the gas pipeline, both air bags being inserted through the same tap hole in the gas pipeline. Then the air bags may be inflated to stop the flow of gas from the gas pipeline. The stopper housing includes a valve means for permitting venting of gas between the upstream and downstream air bags through the same tap hole through which the air bags are inserted into the gas pipeline.
|
