Monitoring Method of Internal Corrosion in Gas Transmission Pipeline

Abstract

The invention discloses a monitoring method for internal corrosion of a gas transmission pipeline, which comprises the following steps: cleaning the working surface of the outer wall of the gas transmission pipeline with anhydrous alcohol, cleaning it with acetone, drying the nickel plating with cold wind; The surface is pressed and fixed on the nickel-plated working surface; connect the potentiostatic instrument or special monitor with the output connector of the monitoring sensor; connect the signal output end of the potentiostatic instrument with a data logger or computer to collect and store data To analyze the corrosion of the inner wall of the gas pipeline. The invention is not affected by the humidity of the metal surface, has a wide measurement range, monitors internal corrosion from the outside of the pipeline, has a flexible working mode, does not need a bypass system, and is simple and convenient to operate.

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

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