Pipeline corrosion is one of the main risk factors for pipelines and one of the few controllable factors in pipeline protection work. Over time, due to construction quality, external force damage, long-term use and underground environment, the anti-corrosion layer of the pipeline may be damaged, aging, brittle, peeling and falling off, and the anti-corrosion capacity will be reduced or even lose its protective effect.
The petrochemical industry is an important pillar industry of my country's national economy, and pipeline corrosion has always been a major problem that plagues the safety production of the petrochemical industry.
Pipeline corrosion will not only bring many unstable factors to enterprise production, but will also affect enterprise production efficiency and production stability to a certain extent. At the same time, with the occurrence of pipeline corrosion, there are safety hazards such as insufficient pressure during use of pipeline equipment, which can easily lead to pipeline breakage and perforation. If media leakage occurs in time, it will not only cause waste of resources, but will also have a harsh impact on the ecological environment along the pipeline. Therefore, effectively inspecting the anti-corrosion layer of the pipelines of petrochemical enterprises and repairing the pipelines in a timely manner can greatly improve the service life of the pipelines and ensure production and operation efficiency.
Pipeline corrosion can only be blocked and not blocked. The integrity of the anti-corrosion layer directly affects the service life of the pipeline. Pipe anti-corrosion layer detection refers to the on-site insulation performance evaluation and insulation fault point positioning of buried pipeline anti-corrosion layer under non-excavation conditions, timely discover and repair insulation faults of anti-corrosion layer, eliminate corrosion leakage risks, and ensure safe operation of the pipeline.
The significance of anti-corrosion layer detection in buried pipelines
1. Accurately locate the leakage points of the anti-corrosion layer, and record its coordinates, relative positions, buried depth and other attribute information.
2. Classify the severity of leakage points of the anticorrosion layer, and determine the priority of repairing leakage points of the anticorrosion layer.
3, detect the insulation resistance of the external anticorrosion layer , evaluate the protective performance of the anticorrosion layer, and determine the aging degree of the anticorrosion layer.
4. Evaluate each external corrosion defect level based on the size of the external corrosion defect, and evaluate the overall condition of external corrosion of the pipeline based on the external corrosion defect level.
The outer corrosion protection layer of the pipeline is the first barrier to protect the pipeline from corrosion and damage to the external environment. Corrosive detection of the outer corrosion protection layer of the pipeline plays an important role in the normal operation of the pipeline.
Pipeline anti-corrosion layer detection principle
transmitter applies a certain current signal to the buried pipeline, and the current intensity will attenuate with the increase of the pipeline distance. When the pipe diameter, pipe material, and soil environment remain unchanged, the better the insulation of the pipeline anti-corrosion layer to the ground, the less current loss applied to the pipeline, and the smaller the attenuation; if the pipeline anti-corrosion layer is damaged, the current signal will form a loop with the ground at the damaged point of the buried pipeline anti-corrosion layer, which will cause the current on the pipeline to leak from the broken point, and form a spherical electric field signal at the broken point, and when it is directly above the broken point, electric field strength is the strongest.
Due to the complex external electromagnetic environment, pipeline corrosion is not something that can be detected by a method or an instrument.
Jinma Pipeline Safety Guard, protect you
Jinma Company combines multiple detection methods with many inspection methods, and summarizes a set of proprietary external anti-corrosion layer detection technology. It can use advanced instruments and technologies to conduct comprehensive and systematic inspection of defects on the external anti-corrosion layer and the pipeline body without excavation and does not affect the normal operation of the pipeline, accurately locate the damage points, evaluate the risk, integrity and operating status of the pipeline, analyze the causes of pipeline corrosion and put forward repair suggestions, repair the damaged anti-corrosion layer in time, and repair the pipeline sections with severe local corrosion, extend the life of the pipeline, and has been widely used in petrochemical enterprises.
buried pipeline anti-corrosion layer detection
1, comprehensive system detection
Collect pipe attributes, buried depth, ground conditions, types of corrosion layer used and usage data, analyze the external environment of the pipeline, and use advanced instruments and technologies to conduct comprehensive systematic detection of defects in the external corrosion layer and pipeline body.
2, accurately locate the damage points
Identify the risk of corrosion outside the pipeline and the corrosion of the pipe body, locate the damage points, record relevant location and other attribute information. The system detection data is analyzed by special software, calculate the insulation resistivity of the pipeline anti-corrosion layer, draw the current attenuation curve, analyze the severity of corrosion, classify it by the degree of damage, and determine the priority of repair.
3. Evaluate pipeline integrity
Evaluate pipeline risks, integrity and operating status, analyze the causes of pipeline corrosion and put forward repair suggestions, repair the damaged anti-corrosion layer in time, and maintain and repair the pipe sections with severe local corrosion, and extend the service life of the pipeline.
Metal pipeline corrosion is an irresistible natural phenomenon. It can only be blocked and slowed down and cannot be eliminated. Therefore, in the case of non-excavation, the pipeline anti-corrosion layer inspection is carried out regularly or targetedly, and the pipeline leakage points are discovered in a timely manner, and the pipeline anti-corrosion layer damage points are found, and the anti-corrosion performance of the pipeline anti-corrosion layer is made comprehensively evaluated. Strengthen the maintenance of the pipeline anti-corrosion layer can extend the service life of the pipeline and ensure the normal operation of the pipeline.
