SU1733992A1 - Method of controlling quality of a pipe-line coating - Google Patents

Abstract

The invention can be used in the petrochemical and gas industry. The electrical characteristic is measured between the external surface of the pipeline and the electrode passed through a fixed torus. The same electrode is a conduit for injecting electrolyte. The electrolyte volume is variable; it changes when the second torus is moved, which is carried out by injecting electrolyte under pressure into the space between the tori, 1 sludge.

Description

The invention relates to conductometry and can be used in the gas and petrochemical industries in monitoring the quality of pipeline coatings.

There is a method of monitoring the state of anti-corrosion insulation of pipelines by measuring and recording changes in its electromagnetic characteristics.

The disadvantage of this method is the need to move the monitored device along the pipeline, which reduces the performance of the control.

The closest to the technical essence of the present invention is a method of controlling the quality of a coating by introducing an electrolyte between two moving tori, interacting with a wire electrode and a pipe, which is the second electrode.

The disadvantage of this method is low productivity due to complexity

mechanical mechanism for moving tori.

The purpose of the invention is to increase the productivity of the control.

The drawing shows a device that implements a method for monitoring the quality of pipeline coating.

The method is implemented in the following sequence of operations.

Two tori are placed in the pipeline under study, and a metal electrode is passed through the first torus, which is a nozzle.

The electrolyte is poured through the nozzle into the space between the tori and the second torus is moved by injecting electrolyte under pressure. When the second torus is moved along the pipeline, the electrical characteristic between the pipeline and the electrode is measured.

The device contains a stationary 1 and a movable 2 tori, between which there is an electrolyte 3. Through the torus 1 is passed

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pipe 4, which is an electrode and serves to supply electrolyte into the space between tori 1 and 2. Pipe 4 is connected to one of the poles of the current source 5, the other pole of which is connected to pipeline 6, in which tori 1 and 2 are installed. capacity 7 with electrolyte. A milliammeter 8 is included in the circuit connecting nipple 4 and pipe 6.

From the tank 7 through the pipe 4 into the space between the tori 1 and 2, electrolyte 3 is injected under pressure (not less than 0.02 MPa), under the action of which the torus 2 moves along pipeline 6. After filling the pipeline 6 with electrolyte the coating of the inner surface of the pipeline b, contacts at the damage site with the metal wall of the pipeline 6, which is electro / c, closes the circuit, and milliammeter 8 indicates the presence of current in the circuit. By knowing the electrolyte consumption, the damage points in the pipeline are determined and eliminated.

Claims (1)

Invention Formula The method of quality control of the pipeline coating, which consists in the fact that two tori are placed in the pipeline under investigation, and a metal electrode, an electrolyte is poured between the tori through a nozzle, the second torus is moved with the electrolyte volume along the pipeline and the electrical characteristic between the pipeline is measured and an electrode, characterized in that, in order to increase the control performance, the second torus is moved by injecting electrolyte under pressure tori, and the electrode is hollow. one