| 摘要 |
Two embodiments of a hot tap are disclosed. In the first embodiment, a hot tap is formed around a pipeline. It includes an elongate sleeve divided into two semi-cylindrical portions. The two portions preferably bolt together. They divide along two lengthwise edges. In the lowermost half, stationary semicircular gripping devices for gripping the pipe are enclosed. They are formed as inserts in the lowermost portion. In the uppermost portion, a semicircular tapered wedge is included at the remote ends. The wedge is located adjacent to a movable tapered collet. It has a set of serrations or teeth which dig into the pipeline. The collet is driven lengthwise against the wedge by means of hydraulically actuated pistons and cylinders. The pistons and cylinders extend, thereby driving the collets against the tapered wedge to firmly grasp the outer surface of the pipe. This arrangement is located at both ends of the elongate cylindrical member. This secures and locates a laterally directed tubular member. It terminates in a flange plate and is adapted to support a drill motor and other mechanisms for puncturing the sidewall of the pipe to form the lateral connection. The lateral connection is formed inside of a hydraulically extendable circular member which has a seal means contacted against the wall of the pipe to be entered. In an alternative embodiment, the lateral tubular member through which the hot tap passage is formed incorporates concentric first and second pistons. They provide a new and improved seal arrangement which can be tested for leakage and which pressurizes seal members for complete sealing of the apparatus.
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