Method for monitoring gas pipeline internal corrosion

A technology for gas pipelines and internal corrosion, applied in pipeline systems, gas/liquid distribution and storage, mechanical equipment, etc. The method is flexible and efficient, the measurement results are accurate, and the accuracy is guaranteed.

Active Publication Date: 2008-10-08
SINOPEC SOUTHWEST OIL & GAS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This in-pipe detection method has obvious defects, the equipment structure is complex and expensive, the detection cycle is long, and there are still many shortcomings in the detection of small-diameter gas pipelines
In terms of gas corrosion monitoring, there are thin-plate overlapping gas corrosion sensors and resistance probe sensors in China, both of which need to place the sensor inside the pipeline to work and set up a corresponding bypass system. The use method is limited and the working range is small.
In addition, thin-plate overlapping gas corrosion sensors can only be used when the gas humidity is high, and reasonable monitoring results cannot be obtained when working under low humidity

Method used

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  • Method for monitoring gas pipeline internal corrosion
  • Method for monitoring gas pipeline internal corrosion
  • Method for monitoring gas pipeline internal corrosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The method for monitoring internal corrosion of gas pipelines is characterized in that: the following steps are carried out sequentially:

[0028] ① Select the working point of the carbon steel gas pipeline to be measured and perform pretreatment.

[0029] Prepare the nickel plating liquid used for nickel plating, and its components are: 1 part of nickel sulfate, 0.18 part of nickel chloride, and 0.16 part of boric acid.

[0030] Clean the selected working surface on the outer wall of the pipeline with absolute alcohol, then clean it with acetone, and dry it with cold air, and then use the nickel plating solution to plate nickel on the working surface to form a nickel-plated layer on the outer wall of the pipeline to be tested. The detection working surface is to use the nickel-plated detection working surface as an external electrode of the sensor;

[0031] ②The monitoring sensor is pre-assembled completely, and then fixedly installed on the detection working surface ...

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Abstract

The invention discloses a monitoring method for internal corrosion of gas pipe line including steps of: cleaning the working surface of gas pipe line external wall with anhydrous alcohol, cleaning the same with acetone, drying and nickeling with cold air blast; compressing and fixing the testing surface of the monitoring sensor on the nickeling working surface; connecting a constant potential rectifier or a special monitoring instrument to the output socket connector of the monitoring sensor; connecting the signal output terminals of the constant potential rectifier to a data recorder or a computer, collecting stored data for analyzing air tube wall corrosion condition. the invention is not effected by metallic face humidness, has extensive measuring range, and internal corrosion is monitored from outside of tubes, flexible operate mode and convenient simple operation are provided without bypass system.

Description

technical field [0001] The invention relates to a method for monitoring the internal corrosion of a gas transmission pipeline, in particular to a method for monitoring the internal corrosion of a gas transmission pipeline for measuring the internal corrosion of a low-carbon steel pipeline. Background technique [0002] In the operation of natural gas, gas pipelines are widely used to transport natural gas. Since the gas pipelines are buried underground for many years, the surrounding environment and the gas transported in the pipelines will cause corrosion to the pipelines. Generally, there are two kinds of external corrosion and pipeline internal corrosion. Not only is it easy to perforate the pipeline due to corrosion and cause gas leakage, which affects the normal production work, but also pollutes the environment and creates serious safety hazards. In order to ensure the safety of gas pipelines, regular corrosion inspections are generally carried out on in-service gas pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17D5/06
CPCY02E60/34
Inventor 张仕强黄彦良王雨生于青郑凤李言涛申洪杨锦林杨强
Owner SINOPEC SOUTHWEST OIL & GAS
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