Method of lining the internal surface of a pipe

Details Method of lining the internal surface of a pipe Method of lining the internal surface of a pipe

1996-11-06

1998-12-29

Aftergut, Karen

Plastic and nonmetallic article shaping or treating: processes

Forming structural installations in situ

Uniting preform member with molding material

138 97, 264 36, 264269, 427235, 427238, 427239, 427294, 427295, 427355, 4273855, 4273881, B32B 3500, E04B 116

Patent

active

058536299

ABSTRACT:
Methods of lining the internal surface of a pipe, include first inserting two lining pigs into the pipe and then introducing a batch of resin thereinto, or inserting one lining pig between two batches of a resin, or first inserting a lining pig and then inserting two batches of a resin with another lining pig therebetween, or first introducing a lining pig made of a soft material capable of deforming so as to pass through a narrow-passing section and then introducing a batch of a resin into the pipe, causing the resin to move forward until the front end of the resin reaches an inner end of the pipe, and sucking the resin back from the inner end so as to line the internal surface of the pipe with the resin. The methods use improved liquid blocking pigs for use in pipe lining treatment, each of such pigs includes a spherical body made of a soft resilient material and at least one flexible liquid barrier diaphragm interposed in the spherical body.

REFERENCES:
patent: 3041204 (1962-06-01), Green
patent: 3137318 (1964-06-01), Maneri et al.
patent: 5202157 (1993-04-01), Tomoyasu et al.
patent: 5447664 (1995-09-01), Ito et al.

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