Speed control drive section with failsafe valve
View Patent ↗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.
1. A system for retrieving a pipeline tool from an interior space of a pipeline, the system comprising:
a speed control drive section, said speed control drive section having a bypass flow passageway and a primary bypass flow control valve;
a failsafe valve located in said bypass flow passageway; and
a retaining means for holding said failsafe valve in an opened position;
said retaining means releasing said failsafe valve in response to a prescribed failure condition.
2. A system according to claim 1 further comprising a controller, said controller controlling said retaining means.
3. A system according to claim 1 further comprising the prescribed failure condition being at least one of a timed event and a primary bypass flow control valve failure event.
4. A system according to claim 1 further comprising said primary bypass flow control valve is a plug type valve.
5. A system according to claim 1 further comprising said failsafe valve is a butterfly type valve.
6. For retrieving a pipeline tool from an interior space of a pipeline, a speed control drive section in communication with the pipeline tool comprising:
a longitudinal body having a central bypass flow passageway and at least one external circumferential sealing element;
a primary bypass flow control valve;
a failsafe valve; and
a means for deploying said failsafe valve between a first and second position, said means being responsive to a preset value.
7. A speed control drive section according to claim 6 , the preset value is a predetermined total residence time of the pipeline tool within the pipeline.
8. A speed control drive section according to claim 6 further comprising a means for holding said failsafe bypass flow valve in an opened position.
9. A speed control drive section according to claim 6 , said failsafe bypass flow valve is located forward said primary bypass flow valve.
10. A speed control drive section according to claim 6 , the first position being an opened position as said primary bypass flow valve regulates bypass flow through said central bypass flow passageway.
11. A speed control drive section according to claim 6 further comprising said primary bypass flow valve is a plug type valve.
12. A speed control drive section according to claim 6 further comprising said failsafe valve is a butterfly type valve.