At present, the company's external inspection is mainly devoted to the inspection and evaluation of China's urban pipe network, maintenance construction and ECDA evaluation of long-distance pipelines. The company's technicians are experienced and the inspection methods are scientific and advanced, and has obtained the first-class construction qualification and safety qualification of China industrial anti-corrosion technology association. Be good at dealing with problems related to pipeline cathodic protection system, and be able to solve the impact of the complex and changeable geographical environment of the city on the pipeline。

• ECDA

External corrosion direct assessment (ECDA) is a structured process that is intended to improve safety by assessing and reducing the impact of external corrosion on pipeline integrity. ECDA is a continuous improvement process. Through successive ECDA application, a pipeline operator can assessment of the integrity of external anti-corrosion coating, the effectiveness of cathodic protection system, stray current interference along the pipeline and corrosion of the pipeline, so as to determine whether the external corrosion system can protect the pipeline.
Main service contents:
• Pipe segmentation
• Pipeline macro inspection and cathodic protection effectiveness inspection
• Inspection and evaluation of pipeline anti-corrosion coating
• Inspection and evaluation of AC and DC stray current
• Dig verification
• Pipeline anti-corrosion coating repair
• Evaluation and issue report

• Inspection and evaluation of external anti-corrosion coating of pipeline

Conduct qualitative assessment on the damage of the external anti-corrosion coating of the buried pipeline under the trenchless condition, and be able to carry out electrical performance inspection,inspection and positioning of the damaged point, corrosion evaluation of the damaged point, pipeline overlapping, cathodic protection fault unspection, etc. on the anti-corrosion coating of the pipeline, so as to provide theoretical basis for the safe operation of the pipeline, and scientifically guide the pipeline maintenance plan and safe production management
Main service contents:
• Location of damage point of external anti-corrosion coating
• Electrical performance test of anti-corrosion coating
• Inspection and evaluation of insulation resistivity of anti-corrosion coating
• Inspection the corrosion activity of the pipe body at the damage point
• Quality evaluation of anti-corrosion coating

• Inspection and evaluation of the AC and DC stray current

Through the investigation of the AC and DC interference of the pipeline and the synchronous test of the pipeline and the interference source side, the scope and degree of the pipeline's interference by the pipeline's stray current can be evaluated, and the evaluation results and drainage engineering services can be provided for the owner's comprehensive treatment of the pipeline's stray current.
Main service contents:
• Inspect the inflow / outflow position and source of stray current
• up to 24 hours of continuous data acquisition and archiving
• synchronous test of subway stray current interference
• evaluate the interference level of stray current
• Inspection of existing drainage facilities and evaluation of drainage effect

• Pipeline dig verification and anti-corrosion layer repair

According to the size, category, type of anti-corrosion coating and site environment of the inspected defect points of the pipeline anti-corrosion coating, select appropriate repair process and repair materials (such as: cold winding tape + viscoelastic body, patch, heat shrinkable tape, light curing sleeve, etc.) for repair construction. And then improve the pipeline cathodic protection system and improve the safety and reliability of pipeline operation.
Main service contents:
• local repair of pipeline anti-corrosion coating
• direct inspection of defect points of anti-corrosion coating
• defect point repair and high-precision positioning
• overhaul of pipeline anti-corrosion coating
• earthworks for pipeline anti-corrosion coating repair

• Inspection and evaluation of cathodic protection effect

Aiming at the close spacing inspecton of pipeline potentiostat, test pile cathodic protection potential, test piece potential and cathodic protection potential, as well as the evaluation of leakage of insulating flange and valve chamber, analyze and judge the status of pipeline cathodic protection system, evaluate the effectiveness of cathodic protection, and provide consulting and rectification services for cathodic protection projects.
• Daily cathodic protection system maintenance
• Sacrificial anode inspection, maintenance and installation services
• Installation and maintenance services of drainage system
• Installation of pipeline ground facilities
• Installation of polarization test piece

• Pipeline direction and buried depth inspection

• Maintenance of cathodic protection facilities

Pipeline cathodic protection is an internationally recognized anti-corrosion technology, and the anti-corrosion effect is particularly remarkable. Our company is committed to the engineering construction and technical services related to cathodic protection.