Corrosion resistance experiment method of metal corrugated pipe

Abstract

The invention provides a corrosion resistance experiment method of a metal corrugated pipe, which is realized based on one set of device. The device comprises a pipeline, a corrosion-resisting storagetank, a corrosion-resisting pump, a ball valve, an electromagnetic flow meter, a resistance probe, a thermometer, a pH (Potential of Hydrogen) meter and a dissolved oxygen meter, wherein the pipelineis connected with a metal corrugated pipe to be tested in series; the metal corrugated pipe is provided with a monitoring device and is used for monitoring a corrosion condition in the metal corrugated pipe in real time. The method provided by the invention can be used for really simulating a flowing state and multi-phase flow corrosion of an industrial field and can realize in-situ nondestructive online monitoring of the simulated metal corrugated pipe; the metal corrugated pipe does not need to be frequently detached and an applicable medium range is wide; uniform corrosion and local corrosion information can be provided and corrosion resisting performance and a corrosion mechanism of the pipeline also can be judged; an online monitoring device for corrosion in the pipeline has the characteristics of integrating monitoring, analysis and management, and detecting in real time and the like.

Description

Technical field [0001] The invention relates to the field of corrosion resistance experiments of metal bellows, in particular to an experiment method for corrosion resistance of metal bellows. Background technique [0002] At present, the current metal bellows equipment is always in a harsh working environment during use: the internal environment has many strong corrosive media, a small amount of free water, acidic components (such as carbon dioxide, hydrogen sulfide, etc.), salts, air oxygen components, bacteria, etc. It is easy to cause internal corrosion to the metal bellows. As an important equipment for pipeline connection, metal bellows is of great importance to its safe operation. Corrosion monitoring in pipelines has become a technical issue of widespread concern. [0003] The main methods of pipeline corrosion monitoring include coupon method, resistance probe method, linear polarization resistance method and electrochemical noise method. Each method has its own advantag...

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Problems solved by technology

However, the coupon monitoring needs to be disassembled and assembled, the monitoring period is long, and the average corrosion rate in the test period can only be determined, and the local corrosion effect cannot be reproduced well; the resistance probe method is also not limited by the corrosive medium, and It is not necessary to take out the sample when measuring, which has the advantages of direct, continuous, fast and sensitive

However, this method has strict requirements on sample processing, and cannot measure local corrosion characteristics. It is used in non-uniform corrosion occasions, and the error is relatively large; linear polarization resistance method is a method that is very suitable for on-site corrosion monitoring. Fast response, can obtain uniform corrosion rate, relatively sensitive, can reflect changes in equipment operating conditions in time

However, it is highly dependent on aqueous solutions and is only suitable for corrosion monitoring of electrolyte solutions; the electrochemical noise method is the only method that can provide localized corrosion information, and its disadvantage is that it is more complicated than other methods and usually cannot obtain absolute information on corrosion rates

In short, there is currently a lack of a new electrochemical technology that can comprehensively monitor the internal corrosion of oil and gas pipelines.

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