Method of lining pipes
US4397890A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1982 |
| Grant date | Aug 9, 1983 |
| Priority date | — |
| Expiry date | Jan 29, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L55/179
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of lining a large pipe and small pipes branching therefrom with a seal composition, in which the pipes are lined as connected together, and the large pipe or the small pipes are lined first. The portion of the seal composition forced into the small pipes when the large pipe is lined with use of a running body is returned into the large pipe again and is subsequently applied, without being discharged from the system, to the lining layer of the large pipe as a top coat with use of a running body having a slightly smaller diameter than the running body. When one of the pipes has a greatly bent portion, a running body is used which comprises two members each shaped symmetrically, congruent with each other and interconnected by a flexible linear member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.