Method and apparatus for coating the interior surface of metal pipes
US4474134A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 10, 1984 |
| Grant date | Oct 2, 1984 |
| Priority date | — |
| Expiry date | Jan 10, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S118/10
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method and apparatus for coating metal pipe with a thixotropic coating having a wet film thickness between 30 to 120 mils. The coating is a coal tar epoxy made up of a two component resin and pigment blend with the pigment comprising two sizes of glass beads. The coating material is applied via a slinger rotated within the bore of a pipe while it is moved slowly end to end past the slinger. The coating material is discharged from the slinger in a 360.degree. radial pattern in a plane substantially perpendicular to the axis of the pipe and direction of movement so as to cause a build up of a ring of the material of uniform thickness and thereby form incrementally, but continuously, due to continuous movement of the pipe, a coating of uniform thickness. The pipe is thereafter rotated while the coating is wet to develop a centrifugal force in the range of 50 g to 100 g. The pipe may also be vibrated while being rotated to enhance depletion of air bubbles and spread of coating into cracks and interstices in the internal surface of the pipe and form a smooth lining.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.