High speed pipe lining method and apparatus

Details High speed pipe lining method and apparatus High speed pipe lining method and apparatus

1985-03-29

1986-07-01

Hoffman, James R.

Coating processes

Interior of hollow article coating

Rotating the article

118 55, 118 57, 427234, B05D 722, B05C 1112, B05C 1300, B05C 1302

Patent

active

045979952

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.

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