Pipe liner process

Details Pipe liner process Pipe liner process

1988-04-29

1991-01-22

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

156287, 156294, 264 36, 264230, 264269, 138 97, 138DIG5, B29C 6338, B29C 5308

Patent

active

049869515

ABSTRACT:
Method is provided for lining a pipe wherein a thermoplastic liner is initially formed in a cylindrical shape with a diameter slightly larger than the internal diameter of the pipe. The liner is temporarily deformed at an elevated temperature to a different cross-section, preferably U-shaped, to reduce its overall cross-sectional dimension to facilitate insertion into the pipe to be lined. Once inserted, the pipe liner is reheated to the crystallization temperature of the thermoplastic material to cause the liner to return to its original cylindrical shape. Pressure within the liner is also increased in two stages to cause the liner to conform to the interior surface of the pipe. An expansion pig may also be employed to ensure even more exact conformance. After expansion, ends of the liner which extend beyond the pipe are flared into engagement with the pipe flanges. Service fluid under pressure is introduced into the liner to maintain the liner in its cylindrical shape.

REFERENCES:
patent: 677142 (1901-06-01), Richardson et al.
patent: 2423260 (1947-07-01), Slaughter
patent: 2668987 (1954-02-01), Harris et al.
patent: 2724672 (1955-11-01), Rubin
patent: 2955318 (1960-10-01), Cook et al.
patent: 2971225 (1961-02-01), Woodruff et al.
patent: 2980161 (1961-04-01), Howard
patent: 3192612 (1965-06-01), Elliott et al.
patent: 3335758 (1967-08-01), Bertolet, Jr.
patent: 3371770 (1968-03-01), Graham et al.
patent: 3429954 (1969-02-01), Atkins et al.
patent: 3543334 (1970-12-01), Sudo
patent: 3560295 (1971-02-01), Kimbrell et al.
patent: 3755524 (1973-08-01), McKay
patent: 3758361 (1973-09-01), Hunter
patent: 3856905 (1974-12-01), Dawson
patent: 3897530 (1975-07-01), Leathers
patent: 3959424 (1976-05-01), Dawson et al.
patent: 3996967 (1976-12-01), Takada
patent: 4020136 (1977-04-01), Zaro
patent: 4028037 (1977-06-01), Dawson
patent: 4207130 (1980-06-01), Barber
patent: 4233101 (1980-11-01), Scragg et al.
patent: 4273605 (1981-06-01), Ross
patent: 4321740 (1982-03-01), Davis et al.
patent: 4361451 (1982-11-01), Renaud
patent: 4368091 (1983-01-01), Ontsuga et al.
patent: 4377894 (1983-03-01), Yoshida
patent: 4394202 (1983-07-01), Thomas et al.
patent: 4410391 (1983-10-01), Thomas et al.
patent: 4427480 (1984-01-01), Kamuro et al.
patent: 4446891 (1984-05-01), Gebelius
patent: 4483167 (1984-11-01), Hayashi
patent: 4496499 (1985-01-01), Brittain et al.
patent: 4504171 (1985-03-01), Florence, Jr.
patent: 4627471 (1986-12-01), Parkes et al.
patent: 4643855 (1987-02-01), Parkes et al.
patent: 4691740 (1987-09-01), Svetlik et al.

Affiliated with

Also associated with

Rating

Pipe liner process does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pipe liner process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pipe liner process will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1554021