Field joint
US6264871A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1999 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Jan 14, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L59/20
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The method of forming a field joint around the bare joint of two joined insulation covered pipes includes providing a first angular cut back in the coating to expose the end of a pipe and providing a second cut back in the coating to provide an annular band of the coating of a lesser diameter than the coating on the pipe. A thin coating of polyurethane may then be applied over the first and second cut backs and a recess provided in the band of coating. A mould may then be secured around the lesser diameter band, and polyurethane pumped into the mould in a sufficient amount to form a field joint which extends into the second cut back and lies flush with the coating of the pipes so as to allow for reeling and laying of the pipe without snagging. The field joint can be located around the bare joint and includes a polyurethane infill recessed into the insulated coating of the pipes such that infill lies flush with the surface of the coating on the pipes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.