High speed pipe lining method and apparatus

US4597995A · kind A · utility

Assignee

• AMERICAN Cast Iron Pipe Company · US

Inventors

• William E. Snow · Birmingham, US
• Thomas R. Warren · Birmingham, US

Key dates

• Filing date: Mar 29, 1985
• Grant date: Jul 1, 1986
• Expiry date: Mar 29, 2005

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B05D3/12
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

High speed pipe lining is accomplished by supporting a length of pipe to be lined between spindles in a lathe-type apparatus and rotating the pipe at a speed sufficient to afford a G-force of the order of 10-15 G's. A rather fluid concrete mixture comprising gap-graded sand is introduced into the interior of the rotating pipe using a cantilevered trough. The rotational speed of the pipe is then increased substantially to afford a force of the order of 35-50 G's, and the pipe is subjected to high amplitude axial vibrations for a period of time of the order of one minute or less. The resulting concrete lining is highly compacted, quite dense and hard, and has a smooth surface.