Abstract: An autonomous robotic active gas-carrying pipeline testing system includes a remotely controlled robot assembly movable within the stream of gas flowing in the pipeline, wherein said gas flow exhibits dynamic flow energy, a miniature rotary turbine responsive to the gas flow, an electrical generator responsive to the turbine, a battery responsive to the generator, drive tow means responsive to the generator for moving the assembly, wherein the system is capable of harvesting said dynamic flow energy for either or both charging the battery and/or operating the drive tow means.

Abstract: A system and method for retrieving a pipeline tool from a pipeline includes a speed control drive section that includes a primary bypass flow valve and a failsafe valve located in a central bypass flow passageway of the drive section. The failsafe valve is placed under the control of a controller. The controller is programmed to release the failsafe valve under prescribed failure conditions. An actuating means moves the failsafe valve between a normally opened positioned and a closed position in response to the controller.

Abstract: A system and method for retrieving a pipeline tool from a pipeline includes a speed control drive section that includes a primary bypass flow valve and a failsafe valve located in a central bypass flow passageway of the drive section. The failsafe valve is placed under the control of a controller. The controller is programmed to release the failsafe valve under prescribed failure conditions. An actuating means moves the failsafe valve between a normally opened positioned and a closed position in response to the controller.