Method for recovering wet buckled pipe
US5044827A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1990 |
| Grant date | Sep 3, 1991 |
| Priority date | — |
| Expiry date | Oct 30, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L1/166
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method for severing and recovering a submerged pipeline is disclosed. The severing and recovering operation may be performed with divers or with a remotely operated vehicle. The deflated lift bag is lowered to the submerged pipeline. The deflated lift bag is positioned under the submerged pipeline and then inflated until a section of the pipeline has been raised off of the sea floor. A cutoff saw is next lowered to the raised section of the pipeline. The cutoff saw is clamped to the pipeline prior to severing the pipeline. The cutoff saw is then removed from the severed pipeline. A recovery head is lowered to the raised end of the severed pipeline. The recovery head is aligned and placed in the raised end of the severed pipeline. The recovery head is activated to establish a gripping relationship with the pipeline. A recovery cable is lowered and connected to the recovery head. The recovery cable is retrieved to recover the recovery head and the pipeline to the water surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.