Pressure control for gate-valve and hot-tap drilling systems
US10954730B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2019 |
| Grant date | Mar 23, 2021 |
| Priority date | — |
| Expiry date | Aug 16, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L41/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A gate-valve and/or hot-tap drilling system uses a secondary pack-off or sealing element which can be engaged when the primary sealing element develops a leak. Generally, the secondary sealing element is configured to have an engaged position in which a fluid tight seal is formed such that the secondary sealing element engages the bore wall in a pressure-containing housing and drill rod extending through the bore defined by the bore wall. The fluid tight seal prevents fluid flow in the annulus, if the primary seal develops a leak. When the primary seal is working normally—no fluid leak—the secondary sealing element is in a disengaged position where a fluid tight seal is not formed with the bore wall and drill rod.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.