Joining lined pipe items
US5992897A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Sep 29, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49428
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Steel pipe items such as pipes (10) are each joined by a girth weld (14) to tubular steel fittings (12) and the pipes (10) are each lined by pulling a polyethylene liner (30) through the pipe (10) and through the fitting (12). A ring (32) is forced into each fitting (12) to compress the liner (30) and force it into grooves (20) in the internal surface of the fitting (12). The grooves (20) are separated by castellations (22). The grooves (20) are in a corrosion-resistant cladding (18) deposited on the interior of each fitting (12). Alternatively, the whole of each fitting (12) is made of corrosion-resistant Duplex steel. The ends of the liners (30) are cut short of the ends of the fittings (12) and an annulus 940) of liner material is inserted in the gap. The annulus (40) has an external groove (42) accommodating a body (44) of heat insulation material. The ends of the fitting (12) are joined by a girth weld (15).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.