Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Work-secured and/or work-guided
Patent
1986-06-09
1988-04-19
Simmons, David
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Work-secured and/or work-guided
156287, 156294, 156499, 264267, B24C 2716
Patent
active
047387424
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to construction and operation of main and distribution networks of pressure and pressure-free pipelines, and more particularly it relates to a method of protecting the internal surface of a pipeline against corrosion and to an apparatus capable of performing this method.
2. Description of the Prior Art
Nowadays the problem of affording protection to the internal surfaces of pipelines has become acute. It is particularly acute in what concerns the protection of the internal surfaces of pipelines either under construction or already in operation without the use of adhesive or cementing substances. As the internal surface of a pipeline is moistened by either the fluid being conveyed, e.g. water, or by dew, this surface has to be dried prior to being coated with a flexible sleeve of the coating material.
The drying of the surface being coated has to conducted immediately before the urging of the protective sleeve against the inner wall of the pipeline, for a surface dried in advance might be moistened once again from the atmospheric air by the moment of the application of the protective coating.
At present, there are known various methods and devices for protecting the internal surface of a pipeline against corrosion, e.g. by employment of a cement-sand mixture such as a plant for applying a cement-sand mixture marketed by Ameron Inc., USA.
A shortcoming of this process is its low productivity, with a single unit being operable within one day only 690 meters of pipeline with the diameter of 700 mm may be coated.
There is known another method of protecting the internal surface of a pipeline, including introducing into the pipeline a flexible sleeve of the coating material, which is urged against the internal surface of the pipeline which has been preheated in advance.
The apparatus for performing this method comprises a system for feeding a working fluid into the pipeline, a system for introducing a flexible sleeve, a device for heating the pipeline, and a system for timing the advance of the sleeve and of the heating device (cf. SU Inventor's Certificate No. 1024653, F16L 58/16, 1980).
These method and apparatus are not suitable for protecting against corrosion of lengthy pipelines either under construction or already in operation, with the protective coating being applied with the employment of heating. This is explained by the fact that in the known apparatus the heating device is in the form of an annular oven mounted in the pipeline. In practice, such an oven would not be moved along an extended pipeline with appropriate timing of the advance of the oven and of the sleeve being introduced into the pipeline.
The abovedescribed apparatus is operated under factory conditions and cannot be used for protection of pipelines laid into the soil or supported on an elevated structure.
SUMMARY OF THE INVENTION
The present invention seeks to provide a method of protecting the internal surface of a pipeline against corrosion, which would ensure an effective heating of the internal surface of a pipeline having already been laid with substantial simplification of the technology of protection.
This is attained by a method of protecting the internal surface of a pipeline, consisting in introducing into a pipeline a flexible sleeve having its end portion secured to the internal surface of the pipeline, moving the sleeve and urging it against the internal surface of a pipeline by building up excessive pressure in the space defined by the pipeline and the sleeve, and heating the pipeline. In accordance with the invention, the heating of the pipeline is effected from inside.
The herein disclosed method provides for producing a protective coating not only in a pipeline under construction but also in an existing pipeline laid in the soil or mounted on an elevated structure. This has been made possible owing to the heating of the pipeline being effected from the inside. Thus, there has been eliminated the need for conducting a large volume of
REFERENCES:
patent: 2478711 (1949-08-01), Robinson et al.
patent: 2865321 (1958-12-01), Von Arx
patent: 4135958 (1979-01-01), Wood
patent: 4334943 (1982-01-01), Zenbayashi
"Lining Trailer Equipment", Manual A-101, Date: 9/15/78, Contract Number: 56-4/88084-422.
"The Spunline Process", Customer-Furnished Tools and Equipment, Manual AR-1, Ameron.
"The Spunline Process", Published Materials on Pipeline Rehabilitation, Manual AR-2, Ameron.
Kryazhevskikh Nikolai F.
Shishkin Viktor V.
Simmons David
Trest "Juzhvodoprovod"
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