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Cathodic protection monitoring device and method

A cathodic protection and monitoring device technology, applied in the field of cathodic protection, can solve problems affecting the effectiveness of cathodic protection, distortion of measurement potential, underprotection of pipeline cathodic protection system, etc., to achieve strong practicability and adaptability, easy operation and simple structure Effect

Inactive Publication Date: 2015-05-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the different types of soil where the pipeline is buried, the soil resistivity varies greatly. The conventional surface method to measure the pipeline-ground potential does not target different soil environments, resulting in a large area of ​​soil resistivity. The measured pipeline-ground potential contains a large IR drop. The drop error is sometimes as high as hundreds or thousands of millivolts, which completely distorts the measured potential of cathodic protection of buried pipelines and affects the effectiveness of cathodic protection.
The presence of IR drop affects the measured potential to reflect the real operating status of the pipeline cathodic protection system, which causes the pipeline cathodic protection system to operate in a very dangerous "underprotection" state

Method used

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  • Cathodic protection monitoring device and method

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Embodiment 1

[0016] Embodiment 1: as figure 1 As shown, a cathodic protection monitoring device, the pipeline 4 is provided with a cathodic protection station, the cathodic protection station is provided with a potentiostat 1 as a cathodic protection power supply, the negative pole of the potentiostat 1 is connected to the pipeline 4 through a cathode cable 6, and the potentiostat 1 The positive pole of the positive pole is connected to the auxiliary anode 7 through the anode cable 8, and the monitoring device includes a synchronous interrupter 9, a reference electrode 5, a test pile 3 and a multimeter 2, and the synchronous interrupter 9 is connected to the positive pole of the potentiostat 1 and the anode cable 8; the synchronous interrupter 5 is connected in series between the positive electrode of the potentiostat 1 and the auxiliary anode 7, the test pile 3 is connected to the pipeline 4 buried in the ground, the test pile 3 has a test cable 10 connected to the pipeline 4, and the mult...

Embodiment 2

[0017] Embodiment 2: as figure 1 As shown, a cathodic protection monitoring device measures the pipe-ground potential in the forced current cathodic protection system to evaluate the effectiveness of the cathodic protection, wherein the forced current cathodic protection system includes a cathodic protection station arranged along the buried pipeline 4 , the cathodic protection station is equipped with a potentiostat 1 as a cathodic protection power supply, the negative pole of the potentiostat 1 is connected to the pipeline 4 through the cathode cable 6, the positive pole of the potentiostat is connected to the auxiliary anode 7 through the anode cable 8, and the monitoring device includes a synchronous interrupter 9. The reference electrode 5, the test pile 3 and the multimeter 2, and the synchronous interrupter 5 are connected in series between the positive pole of the potentiostat 1 and the auxiliary anode 7 to control the on-off of the cathodic protection power supply. The...

Embodiment 3

[0019] Embodiment 3: as figure 1 As shown, a cathodic protection monitoring device, as a preferred embodiment of the above, synchronous interrupter 9 with the ratio of power-on time and power-off time is 4:1 to set the on-off cycle to control the on-off of the power supply, the multimeter 2 is energized The power-on potential is measured within the time, and the power-off potential is measured during the power-off time. Setting the on-off period with this ratio can measure the accurate power-off potential, so as to provide accurate measurement results for monitoring. On the basis of this ratio, this embodiment sets the power-on time as 12 seconds and the power-off time as 3 seconds in one on-off cycle. Not only the accuracy of the measurement result is guaranteed, but also the measurement efficiency is ensured.

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Abstract

Belonging to the technical field of cathodic protection, the invention relates to a cathodic protection monitoring device and method. A pipeline is disposed as a cathodic protection station, the cathodic protection station is provided with a potentiostat serving as a cathodic protection power supply, the cathode of the potentiostat is connected to the pipeline through a cathode cable, and the anode of the potentiostat is connected to an auxiliary anode through an anode cable. The monitoring device consists of a synchronous interrupter, a reference electrode, a test pile and a multimeter. The synchronous interrupter is connected to the anode of the potentiostat and the anode cable, and is in series connection between the potentiostat anode and the auxiliary anode. The test pile is in connection with the pipeline buried underground, and is internally equipped with a test cable connected to the pipeline. And the multimeter is respectively connected to the test cable in the test pile and the reference electrode. The cathodic protection monitoring device provided by the invention has the characteristics of simple structure, convenient operation, strong practicability and adaptability, and suitability for various environments, is especially suitable for dry soil region, and is accord with the requirements of the country and petroleum industry for cathodic protection technology and other relevant technical specifications.

Description

technical field [0001] The invention relates to a cathodic protection monitoring device and method, belonging to the technical field of cathodic protection. Background technique [0002] At present, in order to solve the corrosion problems of buried metal pipelines and tank groups, forced current cathodic protection is often used to control the external corrosion of pipelines. This type of cathodic protection needs to be inspected every two months (of course, longer or shorter intervals are also possible) in order to monitor the level of cathodic protection on the pipeline. The pipeline-ground potential is an important parameter to evaluate the operation of the pipeline cathodic protection system. In the prior art, the cathodic protection state is judged by detecting the potential of the cathodic protection system in the energized state through the test pile. Due to the different types of soil where the pipeline is buried, the soil resistivity varies greatly. The conventio...

Claims

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Application Information

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IPC IPC(8): C23F13/22
Inventor 亢春张勇马孝亮邓玉发常桂川张伟石平王冲熊林王代峰李文明
Owner PETROCHINA CO LTD