CA1114243A - Method of repairing corrosion resistant paste type coating of operating pipeline exterior surface - Google Patents
Method of repairing corrosion resistant paste type coating of operating pipeline exterior surfaceInfo
- Publication number
- CA1114243A CA1114243A CA297,534A CA297534A CA1114243A CA 1114243 A CA1114243 A CA 1114243A CA 297534 A CA297534 A CA 297534A CA 1114243 A CA1114243 A CA 1114243A
- Authority
- CA
- Canada
- Prior art keywords
- paste
- coating
- prior
- primer
- exterior surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/12—Coatings characterised by the materials used by tar or bitumen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Abstract of the Disclosure A method of repairing a corrosion resistant paste-type asphalt enamel coating of the exterior surface of an operating pipeline includes the removal of the prior paste coating parts having an inadequate adhesion to the pipe, followed by the application of a primer of the composition similar to that of the prior paste, which results in a partial softening of the prior paste. A
new insulation coating is further applied with a layer smoothing the exterior surface of the pipeline and filling all the pits thereon by using for this purpose a heated adhesive paste of the composition similar to those of the prior paste and the primer with the result that a uniform plastic coating consisting of the prior paste, the primer and the new paste is provided. Thereafter, the pipe with this coating applied is covered with a polymeric film.
new insulation coating is further applied with a layer smoothing the exterior surface of the pipeline and filling all the pits thereon by using for this purpose a heated adhesive paste of the composition similar to those of the prior paste and the primer with the result that a uniform plastic coating consisting of the prior paste, the primer and the new paste is provided. Thereafter, the pipe with this coating applied is covered with a polymeric film.
Description
The present invention relates to pipeline transportation means and more particularly to methods of repairing a corrosion resistant paste-type coating of the exterior surface of an operating pipeline.
Known in the art is a method of repairing a corrosion resistant coating of a pipeline exterior sur-face including the steps of cleaning the pipe till it glitters, priming it and coating with the main insulation coating.
A disadvantage of the known method if applied to an operating pipeline is that the process of removing the prior insulation from the pipeline exterior surface till it glitters is highly labour-consuming and is very expensive in the field. In addition. with the known method employed the quality of a corrosion resistant coating is inadequate and its life-time is less than the service-life of the pipeline metal.
An object of the present invention is to reduce the cost of cleaning the exterior surface of the pipeline.
Another object of the present invention is to improve the quality of a newly-applied corrosion resis-tant coating.
One more object of the present invention is to increase the life-time of a newly-applied corrosion resistant coating.
In accordance with a broad aspect of the invention, there is provided a method of repairing a corrosion resistant paste-type asphalt enamel coating of the exterior surface of an operating pipeline, which includes the steps of first removing portions of a prior
Known in the art is a method of repairing a corrosion resistant coating of a pipeline exterior sur-face including the steps of cleaning the pipe till it glitters, priming it and coating with the main insulation coating.
A disadvantage of the known method if applied to an operating pipeline is that the process of removing the prior insulation from the pipeline exterior surface till it glitters is highly labour-consuming and is very expensive in the field. In addition. with the known method employed the quality of a corrosion resistant coating is inadequate and its life-time is less than the service-life of the pipeline metal.
An object of the present invention is to reduce the cost of cleaning the exterior surface of the pipeline.
Another object of the present invention is to improve the quality of a newly-applied corrosion resis-tant coating.
One more object of the present invention is to increase the life-time of a newly-applied corrosion resistant coating.
In accordance with a broad aspect of the invention, there is provided a method of repairing a corrosion resistant paste-type asphalt enamel coating of the exterior surface of an operating pipeline, which includes the steps of first removing portions of a prior
-2~
.
paste coating featuring an inadequate adhesion to the pipe, followed by the application of a primer coating of the composition similar to that of the prior paste, which results in a partial softening of the prior paste. A new insulation coating is further applied with a layer smoothing the pipeline exterior surface and filling all the pits therein by using for this purpose a heated adhesive paste of the composition similar~to those of the prior paste and the primer, which provides a uniform plastic material of the prior paste, the primer and the new paste. Thereafter, the pipe with this coating applied is covered with a poly-meric film. The adhesive paste when applied is heated to a temperature lower than the temperature of decomposition of the polymeric film.
This method of repairing a corrosion resistant paste-type coating of the exterior surface of an operating pipeline provides a high quality corrosion resistant protec-tion of the pipeline for the whole period of its service-life ;
without increasing the cost.
;
~$;~
The invention will now be described in yrea-ter detail with reference to a preferred embodiment.
The section of an operating pipeline, which is to be repaired, is raised by a pile-lifting means to -the height sufficient Eor mounting and traversing of a cleaning, priming and insulating machines thereon. The portions of a prior paste coating having an inadequate adhesion to the pipe are removed by a cleaning machine from the exterior surface of the pipe, exposing thereby ~lefective areas of the pipe exte-rior surface. The portions pitted with corrosion are repaired9if necessary. A primer coating is further applied, its com-position being similar to that of the prior paste, thus providing a high quality adhesion on the entire pipe surface and the softening of the remaining prior paste. Thereafter, an insulating machine applies a new insulation coating layer of 3 mm to 6 mm smoothing the pipeline exterior surface and filling all the pits therein by employing for this purpose a heated adhesive paste of the composition similar to those -3a-?, :
o~ the prior paste and the primer, and providing therewith a uniform coating, featuring an ade~uate adhesion to the pipe surface and to the polymeric film~
For example, if the prior paste coating consists of bi tumen, the primer composition is as follows: I part of bitu-me~ and 3 parts of petrol, ~hile the adhesive paste composi-tion is: bitumen, solar oil (2 - l~/o~ and, if necessary, fil~
lers up to 20% providing the xequired strength and temperatu-re characteristics of -the coating depending on the maintenan-ce conditions thereof, used as fillers may be debituminiza-tion products, waste products of the pol~mer, rubber produc-tion etc. The pipe with the coating applied is further cove-red with a polymeric film b.y the same insulating machine, uhereas the adhesive ~aste, when being applied, should be hea-ted to a temperature low~ than the decomposition temperatu-re of the pol~meric film.
~ or example~ if a polyvin~lchloride film is used the adhesive paste is heated in the temperature range of 100 150 C. ~he lower limit is dependent on the maximum viseo-si~y of the adhesive paste, which permits of applyi~g thereof by a mechanical means; the upper limit is conditio- :
ned by the elimination of the polymeric ~ lm destruction.
~he proposed method makes it possible to use a pol~meric film without a prior application Or an adhesive coat thereo~.
If it is necessary to reinforce the i~sulatio~, reinforcing materials are applied over the coatingO
:~ . . ~ .:: , ; ~ . : : . . . . .
- ~ . ... . . .. ..
.
paste coating featuring an inadequate adhesion to the pipe, followed by the application of a primer coating of the composition similar to that of the prior paste, which results in a partial softening of the prior paste. A new insulation coating is further applied with a layer smoothing the pipeline exterior surface and filling all the pits therein by using for this purpose a heated adhesive paste of the composition similar~to those of the prior paste and the primer, which provides a uniform plastic material of the prior paste, the primer and the new paste. Thereafter, the pipe with this coating applied is covered with a poly-meric film. The adhesive paste when applied is heated to a temperature lower than the temperature of decomposition of the polymeric film.
This method of repairing a corrosion resistant paste-type coating of the exterior surface of an operating pipeline provides a high quality corrosion resistant protec-tion of the pipeline for the whole period of its service-life ;
without increasing the cost.
;
~$;~
The invention will now be described in yrea-ter detail with reference to a preferred embodiment.
The section of an operating pipeline, which is to be repaired, is raised by a pile-lifting means to -the height sufficient Eor mounting and traversing of a cleaning, priming and insulating machines thereon. The portions of a prior paste coating having an inadequate adhesion to the pipe are removed by a cleaning machine from the exterior surface of the pipe, exposing thereby ~lefective areas of the pipe exte-rior surface. The portions pitted with corrosion are repaired9if necessary. A primer coating is further applied, its com-position being similar to that of the prior paste, thus providing a high quality adhesion on the entire pipe surface and the softening of the remaining prior paste. Thereafter, an insulating machine applies a new insulation coating layer of 3 mm to 6 mm smoothing the pipeline exterior surface and filling all the pits therein by employing for this purpose a heated adhesive paste of the composition similar to those -3a-?, :
o~ the prior paste and the primer, and providing therewith a uniform coating, featuring an ade~uate adhesion to the pipe surface and to the polymeric film~
For example, if the prior paste coating consists of bi tumen, the primer composition is as follows: I part of bitu-me~ and 3 parts of petrol, ~hile the adhesive paste composi-tion is: bitumen, solar oil (2 - l~/o~ and, if necessary, fil~
lers up to 20% providing the xequired strength and temperatu-re characteristics of -the coating depending on the maintenan-ce conditions thereof, used as fillers may be debituminiza-tion products, waste products of the pol~mer, rubber produc-tion etc. The pipe with the coating applied is further cove-red with a polymeric film b.y the same insulating machine, uhereas the adhesive ~aste, when being applied, should be hea-ted to a temperature low~ than the decomposition temperatu-re of the pol~meric film.
~ or example~ if a polyvin~lchloride film is used the adhesive paste is heated in the temperature range of 100 150 C. ~he lower limit is dependent on the maximum viseo-si~y of the adhesive paste, which permits of applyi~g thereof by a mechanical means; the upper limit is conditio- :
ned by the elimination of the polymeric ~ lm destruction.
~he proposed method makes it possible to use a pol~meric film without a prior application Or an adhesive coat thereo~.
If it is necessary to reinforce the i~sulatio~, reinforcing materials are applied over the coatingO
:~ . . ~ .:: , ; ~ . : : . . . . .
- ~ . ... . . .. ..
Claims (4)
1. A method of repairing a corrosion resistant paste-type asphalt enamel coating of the exterior surface of an operating pipeline, including the steps of first removing portions of a prior paste coating featuring an inadequate adhesion to said pipe, followed by the application of a primer coating of the composition similar to that of said prior paste, which results in a partial softening of said prior paste, applying a new insulation coating with a layer smoothing said pipeline exterior surface and filling all the pits therein by using for this purpose a heated adhesive paste of the composition similar to those of said prior paste and said primer, which provides a uniform plastic material of said prior paste, said primer and said new paste, whereupon said pipe with said coating applied is covered with a polymeric film, said adhesive paste when applied, being heated to a temperature lower than the temperature of decom-position of said polymeric film.
2. A method according to claim 1, wherein said prior paste comprises bitumen and said primer comprises a mixture of bitumen and petrol.
3. A method according to claim 2, wherein said adhesive paste comprises a mixture of bitumen and solar oil.
4. A method according to claims 1, 2 or 3, wherein said polymeric film is a polyvinylchloride film.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU772452062A SU778413A1 (en) | 1977-02-23 | 1977-02-23 | Method of repairing corrosion-resistant coating of outer surface of operating main pipeline |
| SU2452062 | 1977-02-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1114243A true CA1114243A (en) | 1981-12-15 |
Family
ID=20695390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA297,534A Expired CA1114243A (en) | 1977-02-23 | 1978-02-22 | Method of repairing corrosion resistant paste type coating of operating pipeline exterior surface |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS53127541A (en) |
| CA (1) | CA1114243A (en) |
| DD (1) | DD134844A1 (en) |
| DE (1) | DE2806722C3 (en) |
| FR (1) | FR2381960A1 (en) |
| SU (1) | SU778413A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR820372A (en) * | 1936-04-09 | 1937-11-09 | Koninklijke Hoogovens En Staal | Pipe having a coating layer on the outside and inside and method for its manufacture |
| FR1002250A (en) * | 1946-08-23 | 1952-03-04 | Pompes Noe L | Pipe with coating, processes and tools for installing this coating |
| US2721823A (en) * | 1953-02-24 | 1955-10-25 | John R Hopkins | Method of and product for repairing protective coated pipes |
| DE1219746B (en) * | 1960-08-10 | 1966-06-23 | Denso Chemie Ges Mit Beschraen | Process for re-insulating damaged bitumen deposits on pipes, containers, cables or the like. |
| US3258032A (en) * | 1961-07-14 | 1966-06-28 | United States Steel Corp | Coating |
-
1977
- 1977-02-23 SU SU772452062A patent/SU778413A1/en active
-
1978
- 1978-02-17 DE DE19782806722 patent/DE2806722C3/en not_active Expired
- 1978-02-21 DD DD20377778A patent/DD134844A1/en not_active IP Right Cessation
- 1978-02-22 FR FR7805090A patent/FR2381960A1/en active Granted
- 1978-02-22 CA CA297,534A patent/CA1114243A/en not_active Expired
- 1978-02-23 JP JP2034678A patent/JPS53127541A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE2806722A1 (en) | 1978-08-24 |
| DE2806722B2 (en) | 1980-04-24 |
| FR2381960A1 (en) | 1978-09-22 |
| SU778413A1 (en) | 1985-08-23 |
| DD134844A1 (en) | 1979-03-28 |
| JPS53127541A (en) | 1978-11-07 |
| FR2381960B1 (en) | 1982-10-15 |
| DE2806722C3 (en) | 1981-01-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |