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Detection method for equivalent diameter of anticorrosive coating damaged surface of buried steel pipeline

A technology of equivalent diameter and anti-corrosion layer, which is applied in the field of indirect detection of the equivalent diameter of the damaged surface of the anti-corrosion layer of buried steel pipelines, can solve the problem that the damage size of the anti-corrosion layer cannot be accurately given.

Inactive Publication Date: 2013-03-06
丹阳奥恩能源科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, IR% is only a range, and the size of the damage of the anti-corrosion layer cannot be accurately given. This patent application proposes a relatively simple method for calculating the equivalent diameter of the damage point of the anti-corrosion layer, as follows:

Method used

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  • Detection method for equivalent diameter of anticorrosive coating damaged surface of buried steel pipeline
  • Detection method for equivalent diameter of anticorrosive coating damaged surface of buried steel pipeline
  • Detection method for equivalent diameter of anticorrosive coating damaged surface of buried steel pipeline

Examples

Experimental program
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Effect test

Embodiment 1

[0080] Example 1: There is a steel buried pipeline with a diameter of 325*6mm, the transmission medium is natural gas, and the operating pressure is 1.6MPa; the anti-corrosion protection adopts an applied current and an additional 3PE anti-corrosion layer. The surrounding environment of the pipeline is farmland and the soil is moist. There are no branches in the pipeline in the detection area.

[0081] Detection tools: PCS-2000 DC potential gradient detector produced in Australia, Japanese Fuji PL960 metal pipeline and cable positioner, distance measuring wheel, and vernier caliper.

[0082] Follow the steps below when testing:

[0083] 1. First, add the switch in the DC potential gradient detector PCS-2000 to the wire between the cathodic protection device of the applied current and the pipeline to realize the periodic on-off of the current on the wire (1 / 3 second on, 2 / 3 seconds off); adjust the applied current device so that the difference between the ground potential of ...

Embodiment 2

[0089] Example 2: There is a steel buried pipeline with a diameter of 219*6mm, the transmission medium is natural gas, and the operating pressure is 0.4MPa; anti-corrosion protection adopts sacrificial anodes and an additional 3PE anti-corrosion layer. The pipeline is located on the sidewalk next to the road in the urban area, and the sidewalk is laid For cement sand bricks. The detection area is between two valve wells, about 1500m long, and the pipeline between the two valve wells has no branches.

[0090] Detection tools: PCS-2000 DC potential gradient detector produced in Australia, Japanese Fuji PL960 metal pipeline and cable positioner, distance measuring wheel, vernier caliper, 220V AC current generator, constant voltage and constant current potentiometer.

[0091] Follow the steps below when testing:

[0092] 1. First, apply periodic on-off (1 / 3 second on, 2 / 3 second off) current to the pipeline through the switch in the DC potential gradient detector DCVG at the valv...

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Abstract

The invention discloses a detection method for equivalent diameter of an anticorrosive coating damaged surface of a buried steel pipeline. A direct current potential gradient technique is adopted in the method, the equivalent diameter of the damaged surface of the pipeline is calculated by detecting the D-value delta Uon- delta Uoff of on-off direct current potential differences from a damage spot position of a pipeline anticorrosive coating to a distance ground, the D-value delta Uon-delta Uoff of ground potentials of on-off direct current pipes of the damage spot position, and burying depth h of the pipeline. The detection method is simple in operation process, and is a new method for anticorrosive coating detection of the buried steel pipeline and pipeline safety evaluation.

Description

technical field [0001] The invention belongs to the field of steel pipeline anticorrosion layer detection, in particular to an indirect detection method for the equivalent diameter of the damaged surface of the buried steel pipeline anticorrosion layer. Background technique [0002] In recent years, with the strong support of local governments and the enhancement of people's awareness of environmental protection, China's gas industry has entered a stage of rapid development, and the mileage of gas pipelines has increased significantly. This raises a major issue for the operation safety of gas pipelines, especially the safety work of the anti-corrosion layer of buried steel gas pipelines. [0003] At present, the methods mainly used at home and abroad for detection outside the steel anti-corrosion layer include closely spaced potential technique (CIPS), DC potential gradient method (DCVG), AC tube current method (PCM, C-SCAN) and Pearson method. Among these detection methods...

Claims

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Application Information

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IPC IPC(8): G01B7/12
Inventor 叶根银解东来
Owner 丹阳奥恩能源科技发展有限公司
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