| 摘要 |
Apparatus and methods facilitating isolation of a pipe segment for repair thereof include releasable reclosable means for gripping the pipe exterior, a first conduit extending through the releasable gripping means transverse to the pipe when the releasable gripping means is about the pipe with an end of the first conduit terminating proximate the pipe exterior, sealing means sealing between the first conduit and the pipe exterior surface, a second conduit communicating with the first conduit remote from the end of the first conduit which is closest to the pipe exterior, cutting means insertable through the first conduit for cutting an aperture in the pipe wall with the cutting means having a passageway therewithin extending axially from the cutting end to a position along the cutting means lateral surface for withdrawal of fluid from the cutting point, an inflatable bladder insertable into the pipe interior via the first conduit and serving to block the interior of the pipe when inflated and valve means for selectably opening and closing the first conduit. The invention provides means for isolating the pipe segment needing repair with minimal loss of fluid from the pipe requiring repair during the repair procedure.
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