Coating method for pipe having weld bead
US8038829B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2007 |
| Grant date | Oct 18, 2011 |
| Priority date | — |
| Expiry date | Jan 27, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05D2451/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Method of coating pipe having a raised weld bead. Curable resin polymer is applied to the pipe and allowed to bond to form a cured or partially cured polymer layer on the pipe. Powder form adhesive composition is applied on the polymer layer while hot, with fusion into a film bonding to the polymer. Powder form polyolefin is applied to the adhesive while hot with fusion into a film bonding to the adhesive to form a powder-based coating. Following forming of the powder-based coating, the pipe is cooled from the inside. An outer polyolefin covering is bonded to the powder-based coating and the pipe cooled to ambient temperature. This procedure can avoid voids, cavities or pinholes forming in the coating adjacent the weld bead.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.