Method for monitoring gas pipeline internal corrosion

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...

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

Images