Scraper for inhibiting corrosion in the arch of a pipe carrying a multiphase corrosive liquid
US6886206B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 2000 |
| Grant date | May 3, 2005 |
| Priority date | — |
| Expiry date | Mar 31, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L58/1027
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method for inhibiting corrosion (18) in the arch of a pipe (10) carrying a multiphase corrosive liquid containing a liquid phase (12) which flows off at the lower part of the pipe (10) and a gaseous phase (14) which flows off at the upper part of the pipe. The method includes the following: a scraper (16) is introduced into the pipe, a joint (27) is provided between the scraper (16) and the inner wall of the pipe in such a way that the scraper is moved along the pipe from top to bottom as a result of the effect of the pressure difference between the top and bottom, a liquid that inhibits corrosion is introduced into the scraper or the liquid is injected into the pipe where it is mixed with the liquid phase (12), the scraper is provided with an uptake and projection device (22) that enable the corrosion-inhibiting liquid contained in the scraper or the mixture contained in the pipe to be taken up, whereby the liquid is projected onto the inner wall of the arch of the pipe as the scraper advances in the pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.