Claims
- 1. A method of internally coating the inner surface of a pipeline and filling leaking cracks from inside of the pipeline comprising the steps of:
- disconnecting the pipeline at two different locations,
- closing both ends of the pipeline,
- discharging any gases remaining in the pipeline,
- filling said closed end pipeline with a soluble emulsion type sealant in a foam state by use of inert gas or air,
- applying a predetermined pressure to the foam-filled pipeline for a predetermined period of time thereby forcing some of said sealant foam into leaking cracks,
- directing an inert gas or air flow into said foam-filled pipe to drain any excess amount of said sealant from said pipeline thereby forming a tubular form of said sealant adhering to said pipe along its inner wall surface and extending along its length, and
- allowing said tubular form adhering to the inner surface of said pipeline to cure
- wherein the sealant contains fine particles of inorganic oxide weakly adhering to one another into aggregations.
- 2. A method of internally coating the inner surface of a pipeline as claimed in claim 1 in which:
- subsequent to draining any excess liquid sealant from said pipeline, directing a hot air stream at a temperature of from about 30-100.degree. C. through said pipeline to cure said sealant adhering to said inner surface of said pipeline.
- 3. A method of internally coating the inner surface of a pipeline as claimed in claim 2 in which:
- the inorganic oxide is selected from a group consisting of silica, alumina, silica-alumina, zeolite, titanium oxide, zinc oxide and magnesium oxide.
RELATED PATENT APPLICATIONS
This invention is a continuation-in-part of application Ser. No. 416,188 filed Sept. 9, 1982, now abandoned, which is a division of application Ser. No. 304,439 filed Sept. 21, 1981, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3287148 |
Hilbush |
Nov 1966 |
|
4327132 |
Shinno |
Apr 1982 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
304439 |
Sep 1981 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
416188 |
Sep 1982 |
|