Coating apparatus – With means to prepare work surface for coating
Patent
1986-06-09
1987-10-13
Marcus, Stephen
Coating apparatus
With means to prepare work surface for coating
118DIG10, 118408, 138 97, F16L 5518
Patent
active
046990780
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to the operation of pipelines, and more specifically, it deals with a method and apparatus for repairing a pipeline.
2. Description of the Prior Art
Known in the art are methods and apparatuses for repairing pipelines (cf. A Drawing Technique for Restoring Pipelines. Operating Instructions. Ameron Co., USA, 1978).
In accordance with the prior art method, openings are cut-out in the pipeline at 230 m spacing. Then a flexible line is laid along the pipeline, and a traction cable is drawn into the pipeline by means of this flexible line. A cleaning means is moved through the pipeline by the traction cable. After the cleaning, a device for laying the traction cable is again moved through the pipeline so as to move, through the pipeline, a coating application means and hoses for supplying compressed air and mortar to the coating application means (i.e. energy amd mortar supply lines). The means for laying a flexible line along the pipeline comprises a prime mover having an electric motor moving through the pipeline and a drum with a stock of flexible line installed outside the pipeline.
However this sequence of steps requires a long time for repair of a pipeline and calls for use of special mechanisms for each step thus resulting in an increased repair cost, prolonged cleaning time and high labour effort for operating various mechanisms.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a method and apparatus for repairing a pipeline wherein, owing to the combining of auxiliary steps of laying various lines, a part of the equipment might be dispensed with, with simplification of the process and facilitation of operation.
This object is accomplished by a method for repairing a pipeline, comprising the steps of cleaning a pipeline from deposits, laying a flexible line, and drawing into a pipeline a traction cable and energy and mortar supply lines connected to a coating application means. According to the invention, the flexible line is laid concurrently with cleaning of the pipeline from deposits.
The apparatus for carrying out the method for repairing a pipeline according to the invention, comprises a cleaning means, a means for supplying a flexible line, and a means for applying a coating to the inner surface of the pipeline connected to a traction cable and to energy and mortar supply lines. According to the invention, the means for supplying a flexible line is installed on the cleaning means, behind its cutting tool, and comprises a chamber which is open at the end thereof and houses a horizontally mounted reel with a flexible line and with a rotatable member for paying-off the flexible line from the reel.
Laying the flexible line during cleaning of the pipeline makes it possible to simplify repair of pipeline and cutdown the repair time, while at the same time reducing the number of pieces of equipment and dispensing with an independent prime mover for laying the flexible line. Reliability of flexible line laying is improved because the whole stock of flexible line moves together with the cleaning means through the pipeline.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in detail in the following disclosure of an embodiment of a method and apparatus for repairing a pipeline with reference to the accompanying drawings in which:
FIG. 1 is a schematic view of an apparatus installed in a pipeline; and
FIG. 2 is a sectional view taken along line II--II in FIG. 1.
DESCRIPTION OF A PREFERRED EMBODIMENT
A method of repair comprises the steps of cutting-out, in a pipeline 1 (FIG. 1), openings 2 at a certain spacing. Then a known per se cleaning means 3 is installed in the pipeline 1 through one of the openings 2, the cleaning means being caused to move through the pipeline under the action of a fluid flow. A stock of flexible line 4 is hanged on the cleaning means 3, the end of the flexible line being secured, by means of a swivel joint, to a traction cable or to the pipeline adjacent to t
REFERENCES:
patent: 2108319 (1938-02-01), Perkins
patent: 2794197 (1957-06-01), Crane
patent: 3056155 (1962-10-01), Harmes
patent: 3107379 (1963-10-01), Hill
patent: 3547406 (1970-12-01), Bielstein
Medunitsa Vladimir L.
Shishkin Viktor V.
Shlatgauer Boris I.
Marcus Stephen
Thronson Mark
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