The present invention provides methods and systems for an upstream pipe plug that includes a first bulkhead, a second bulkhead, a vent pipe engaged to the second bulkhead, and an insertion pipe engaged to the second bulkhead.

A gripping apparatus for use in gripping a pipe, for holding forces, or restraining relative movement. The pipe defines an inside radius. The gripping apparatus has an outer surface where the outer surface defines a transition surface or a curve. In certain embodiments the transition surface or curve has a radius less than or equal to the inside radius of the pipe.

A method for sealing a leak in a pipeline used to transport fluid includes positioning a sealing device within the pipeline, moving the sealing device through the pipeline to a leak location, and internally generating an inflation pressure to inflate the sealing device to substantially cover a leak opening and limit release of the fluid from the pipeline.

A method for sealing a leak in a pipeline used to transport fluid includes positioning a sealing device within the pipeline, moving the sealing device through the pipeline to a leak location, and internally generating an inflation pressure to inflate the sealing device to substantially cover a leak opening and limit release of the fluid from the pipeline.

A gripping apparatus for use in gripping a pipe, for holding forces, or restraining relative movement. The pipe defines an inside radius. The gripping apparatus has an outer surface where the outer surface defines a transition surface or a curve. In certain embodiments the transition surface or curve has a radius less than or equal to the inside radius of the pipe.

The present disclosure provides an isolation tool for isolating a section of pipe or a vessel and methods for isolating a section of a pipe or a vessel. In particular, the present disclosure provides a double isolation and bleed (DIB) isolation tool, for use in line-stopping operations and methods of line isolation employing the isolation tool.

A gripper for a test or isolation plug is provided. The gripper includes at least one gripper segment having a pipe or tube confronting surface with a plurality of separate rows of gripper teeth longitudinally-spaced apart on the surface. Each of the separate rows of gripper teeth comprising an alternating array of individual tips and gaps such that each row is serrated along its length.

A gripping apparatus for use in gripping a pipe, for holding forces, or restraining relative movement. The pipe defines an inside radius. The gripping apparatus has an outer surface where the outer surface defines a transition surface or a curve. In certain embodiments the transition surface or curve has a radius less than or equal to the inside radius of the pipe.

A fluid-transferring expander, wherein a tube is disposed through a bladder structure, an expansion space is formed between the tube and the bladder structure, the tube is continuously extrudedly formed, the tube is formed with a first passage connected with a first fluid source and a second passage connected with a second fluid source and outside therein, and the tube is further formed with a through hole communicating with the expansion space and the first passage.

The invention relates to an intervention method for acting on the wall of a fluid pipeline by using a tool comprising a pipe segment and at least first means for creating sealing and second means for creating sealing, the method comprising a step of moving the tool inside the pipeline until the pipe segment is positioned facing a zone of the wall of said pipeline, the method further comprising a step of creating sealing upstream and downstream from said zone respectively by using the first and second means for creating sealing so as to seal off an outer portion of a segment of the pipeline around said zone, followed by a step of acting on said zone of the wall.