Load compensator for a pipe running tool
US6691801B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2001 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | Sep 14, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/165
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A load compensator is disclosed for use in connection with a pipe running tool. The load compensator includes an outer housing connected to the portion of the pipe running tool that holds the pipe segment. A piston is disposed within the housing, and is connected to a top drive system of the pipe running tool. The housing is formed with a first port through which pressurized air is delivered inside the housing to drive the piston within the housing. A second port is disposed at a selected location on the housing, such that when the piston is advanced past the second port, pressurized air passes through the port, and causes the control circuit to stop delivering air through the first port. Once pressurized air no longer flows through the second port, the control circuit causes air to be delivered to the first port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.