Flexible line pipe
US6186181A · kind A · utility
46Cited by
15References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1999 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Apr 21, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L59/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a flexible line pipe comprising an inner corrugated metal tube (4), an outer corrugated metal tube (5) located at some distance from the inner tube (4) and a spacer as well as an insulation material between the inner and the outer metal tubes, whereby a pressure that is less than atmospheric pressure prevails in the ring-shaped gap (6) between the tubes, the spacer comprises two cords (7, 8) made of fiber-reinforced plastic applied to the inner tube (4) and wrapped in opposite directions. The insulation material (9) is a fleece material, and the pressure in the ring-shaped gap is between 10.sup.-3 and 10.sup.-1 mbar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.