Abstract: A removable apparatus for upgrade of an in-service pipeline without disrupting the flow of fluid within the in-service pipeline. The removable apparatus comprises at least one enclosure having a top section and a bottom section for temporarily enclosing a pipe section of the in-service pipeline. The top section and bottom sections are sealably disposable around the pipe section. A repairing mechanism for repairing the pipe section or an insertion mechanism for inserting and connecting a pipeline element to the pipe section is disposed within the enclosure.

Abstract: A combination pipe cutter and gate valve for plastic pipe insertable into an in service pipe through which a fluid is flowing. The combination pipe cutter and gate valve comprises a valve body, means for securing a valve body around a portion of the plastic pipe into which the valve is to be inserted, a shear disposed within the valve body, means for lowering the shear toward the pipe and a cutting element secured to the leading edge of the shear, the cutting element forming a single cutting edge having a length such that the pipe is completely severed after the shear has passed completely through the pipe. As the shear passes through the pipe, the plastic material of the plastic pipe is deformed forming a seal against the faces of the shear.