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The operation and management of anti-corrosion facilities is very important to prolong the service life of pipelines and realize continuous and long-term safe operation. According to the particularity of buried pipeline corrosion control, the operation and management of anti-corrosion facilities mainly includes two aspects. One is the evaluation of pipeline anticorrosion state (including anticorrosive coating), the other is cathodic protection system and its maintenance.
1¡¢ Evaluation of pipeline anticorrosion status
The evaluation of pipeline anti-corrosion status includes leakage detection of anticorrosive coating and pipeline corrosion investigation.
(1) Leakage detection of anticorrosive coating
The leakage of anticorrosive coating, pinhole and damage are all quality defects. Therefore, the pipeline management department stipulates to inspect the anticorrosive coating of the pipeline under its jurisdiction every year to find out the defects and repair the defective parts.
The leakage detector of the anti-corrosion coating of the electronic tube can quickly and accurately find the leakage point from the buried pipe to the anti-corrosion coating. Its working principle is based on the electromagnetic theory.
The soil around the buried pipeline is artificially formed a magnetic field, which changes the electromagnetic field in the area. At this time, through the influence of the pipeline on the electromagnetic field, we can find and find out the direction of the pipeline. At the same time, according to the strength of the received signal, the leakage point of the pipeline anti-corrosion coating is determined.
(2) Pipeline corrosion
After the buried pipeline is put into operation, with the passage of time, the pipeline will be affected by many factors, such as the aging of anti-corrosion materials, construction quality, soil environment and so on, which will gradually lead to corrosion and even perforation leakage accidents. Therefore, it is necessary to investigate the corrosion status of the pipeline regularly, make macro judgment, find out the weak link, and carry out maintenance in time.
The investigation methods of pipeline corrosion are mainly through consulting technical files, interviewing informed personnel and pit inspection.
Test pit inspection is the most basic and direct method to understand the pipeline damage. The underground pipeline is exposed through the test pit. Through direct observation and analysis and detection of relevant samples, the protection effect and damage situation of the anti-corrosion coating, the corrosion state of the steel pipe and the corrosion rate of the steel pipe can be understood, so as to determine the service life of the steel pipe, what kind of repair and protection measures are needed, as well as to find out the causes, laws and key areas of corrosion, such as the drastic change of soil The results show that the cathodic protection potential drops suddenly or can not reach the protection area, stray current interference area and the main crossing section.
The contents of pipeline corrosion investigation include:
¢Ù Collect technical data of pipeline, corrosion damage and maintenance data after pipeline completion;
¢Ú Corrosion environment investigation;
¢Û Investigation of anticorrosive coating condition;
¢Ü Pipeline corrosion investigation;
¢Ý Investigation of cathodic protection.
2¡¢ Cathodic protection detection and operation maintenance
Cathodic protection is one of the main measures to protect underground metal pipelines from soil corrosion and prolong the service life of pipelines. Therefore, careful maintenance and management must be carried out in use.
The protection stations in some areas have realized remote measurement and remote control in the control center without personnel on duty. The monitoring of the protection station can automatically constant potential after manual adjustment. It is only necessary to send personnel to inspect and maintain the cathodic protection station every month or longer. The detection system is based on the working condition of cathodic protection system. Generally, a detection point is installed every 1-3km. At special points, it is decided whether to set it according to the design requirements. It is generally conducted once a month to detect the working condition of cathodic protection system. The manual detection of cathodic protection system of long-distance oil pipeline is very laborious, especially when the pipeline is in the wild mountains, which is labor-intensive, time-consuming and uneconomical.
After the pipeline cathodic protection station is completed and put into operation for a period of time, the power supply output current increases and the pipeline protection distance decreases under the specified electrified potential. In serious cases, the whole protection pipe section can not reach the protection potential. Or in the sacrificial anode protection, the output current of each sacrificial anode group is larger, and the sum of them has exceeded the protection current required by the pipeline, but the pipe ground potential still can not reach the specified index. This is mainly due to the unprotected underground metal structures connected to the original protection pipeline system. This is commonly known as cathodic protection pipeline leakage phenomenon. Since the leakage point can only occur at the intersection of the protective pipe and the unprotected pipe, or where the protective pipe is equipped with an insulating flange, the search for the leakage point is to find the electrical connection point between the protective pipe and the unprotected pipe and judge whether the insulating flange has leakage.
Shandong Linyi Bosi conductive materials Co., Ltd. is a high-tech enterprise specializing in the production of MMO flexible anode, conductive polymer flexible anode and titanium coated anode, mainly providing corrosion protection, cathodic protection, engineering design, installation and technical services.