Pipe linings
US4786525A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 1983 |
| Grant date | Nov 22, 1988 |
| Priority date | — |
| Expiry date | May 16, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L55/1645
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A spraying device is drawn through an underground pipe and sprays a thixotropic resin onto the inner walls of the pipe. The resin cures and hardens, to form an internal lining to the pipe. The resin has sufficient thixotropy to enable it to be applied in a single operation to a significant thickness, preferably in the range 2 to 25 mm. The lining which is formed upon curing therefore has significant structural strength. To allow such a resin to be pumped from the surface down to the spraying device, along a significant length of tubing, the resin is firstly heated, prior to being pumped. Also disclosed is a swab for swabbing a pipe immediately prior to the application of a lining therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.