Core Technical System

▪ Pearson Method: Applies 1000Hz alternating current signal to detect the surface voltage gradient at coating damage points, with centimeter-level positioning accuracy, suitable for screening anti-corrosion coating leakage points.

▪ Multi-Frequency Pipe Current Mapping (PCM): Applies alternating current to evaluate the insulation performance of anti-corrosion coatings via current attenuation curves, and calculates segmental insulation resistance.

▪ Direct Current Voltage Gradient (DCVG): Uses the voltage gradient formed by cathodic protection current leakage to locate damage points and estimate defect size, free from alternating current interference.

▪ Frequency Conversion & Selection Method: Quickly surveys the average insulation performance of anti-corrosion coatings for the entire pipeline section, with an inspection efficiency of 15-20km per day.

Core Strengths

▪ Non-contact inspection with no excavation required, protecting the surrounding environment and facilities near pipelines.

▪ High positioning accuracy for damage points, supporting layered inspection from "full-line survey" to "precise positioning".

▪ Adapts to various anti-corrosion coating types including petroleum asphalt, PE and adhesive tapes, with comprehensive and reliable inspection results.

Core Equipment

▪ SL-2098 Anti-Corrosion Coating Inspection Tool: Supports "human body capacitance method" for leakage detection, with simple and convenient operation.

▪ RD400-PCM Inspection Tool: Imported equipment from Radiodetection (UK), with high current mapping accuracy and equipped with an A-frame for damage point location.

▪ DCVG/CIPS Integrated Inspection Tool: Equipment from CATH-TECH (Canada), synchronously evaluates anti-corrosion coating and cathodic protection performance.

Aging assessment of anti-corrosion coatings for buried steel pipelines, acceptance of anti-corrosion coatings for newly built pipelines, and guidance for repairing damaged anti-corrosion coatings of in-service pipelines.

Inspection Items

▪ Pipeline-to-Ground Potential Test: Measures ON/OFF potential (with/without IR drop) to evaluate cathodic protection effectiveness, and judges whether the -850mV protection standard is met.

▪ Cathodic Protection Equipment Inspection: Monitors output current and voltage of potentiostats, tests grounding resistance of anode beds, and inspects insulation performance of insulating flanges.

▪ Stray Current Inspection: Detects AC/DC stray current interference, evaluates corrosion risks to pipelines, and formulates drainage solutions.

Core Strengths

▪ Supports intelligent remote monitoring: Real-time potential data collection via wireless data transmission module, reducing on-site workload.

▪ Close Interval Potential Survey (CIPS): Samples at 1-3 meter intervals along the pipeline to accurately present potential distribution and identify protection blind areas.

▪ Complies with SY/T industrial standards, and inspection data can be directly used for optimal design of cathodic protection systems.

Application Scenarios

Evaluation and operation optimization of cathodic protection effects for buried pipelines, storage tank bottoms and metal structures in station yards; stray current protection for pipelines adjacent to railways and subways

Inspection Items

▪ Pipeline Location & Burial Depth Inspection: Adopts a pipeline locator (frequency domain electromagnetic method) to determine pipeline route and burial depth, with an accuracy of ±0.1m.

▪ Soil Corrosiveness Inspection: Measures soil resistivity, pH value and bacterial corrosion conditions to assess environmental corrosion risks.

▪ Crossing & Spanning Section Inspection: Checks for missing structural fittings of spanning pipelines, and exposure or scouring of crossing pipelines.

▪ Pipeline Excavation Verification: Excavates suspected defect points to inspect anti-corrosion coating thickness/adhesion, pipeline corrosion pit depth and weld quality.

Application Scenarios

Pipeline route verification, environmental risk assessment around pipelines, corrosion condition verification of aged pipelines, and illegal building screening near pipelines.

Technical Principle

Based on the dielectric constant feedback differences of objects with different materials, the main engine of the multi-functional pipeline locator emits specific electromagnetic signals. When electromagnetic waves propagate to buried pipelines, the signals reflect immediately due to the dielectric constant difference between pipelines and soil. The receiver captures the reflected electromagnetic signals at pipeline edges, and then determines the specifications, location, burial depth and route of metal/non-metal pipelines and cables.

Core Strengths

▪ Trenchless operation with no damage to the ground or pavement, minimal impact on the environment and traffic.

▪ Lightweight and portable equipment, low operation threshold and high deployment efficiency.

▪ Supports detection of multi-material pipelines including metal and non-metal, with a wide application scope.

▪ High detection accuracy, capable of quickly locking core pipeline parameters to provide a basis for subsequent construction and inspection.

Core Equipment

Multi-Functional Pipeline Locator: Integrates signal transmitting and receiving functions, captures reflected electromagnetic signals of pipelines by distinguishing dielectric constants of different sections, and realizes pipeline parameter detection.

Application Scenarios

Route detection of water supply and drainage pipelines, location of gas pipelines, burial depth measurement of oil pipelines, pipeline inspection for environmental supervision, and general pipeline survey for exploration and mapping.

Technical Principle

Water leakage at pipeline cracks generates leakage sounds of specific frequencies, which propagate through pipeline walls or surface soil. Inspectors use professional acoustic equipment to receive and amplify the leakage sounds, judge the approximate location of leakage points according to sound intensity and frequency characteristics combined with on-site environment, and gradually narrow the screening range.

Core Strengths

▪ Low cost with less equipment investment, suitable for large-scale preliminary screening operations.

▪ Lightweight and easy to operate, facilitating rapid on-site deployment.

▪ Quickly grasp the approximate distribution of leakage points in a region, improving the efficiency of subsequent precise inspection.

▪ Strong compatibility, easy to combine with other inspection methods such as correlators to optimize inspection results.

Core Equipment

▪ Electronic Leak Detector: Used for manual preliminary inspection, monitoring near valves or meter wells to preliminarily judge the existence of leakage points.

▪ Leak Detection Rod: Amplifies leakage sound signals to enhance sound recognition and further confirm the approximate area of leakage points.

▪ Digital Acoustic Stick: Precisely monitors pipeline nodes or positions in front of user meters, suitable for rechecking suspicious points.

Limitations

▪ Greatly affected by external interference such as environmental noise and traffic sounds, with easily compromised inspection accuracy.

▪ Sensitive to pipeline materials and burial depth; weak leakage sound propagation for plastic or deeply buried pipelines, leading to low detection sensitivity.

▪ Relies on operators’ experience and judgment, with subjective factors exerting a great impact on results.

Application Scenarios

Leakage point detection for metal pipelines in old communities, daily inspection of metal pipelines in old urban areas, leakage point screening in areas with low noise and little traffic impact at night, and verification in the leakage point recheck stage.

Typical Application Suggestions

▪ Can be used combined with a correlator: conduct preliminary screening of suspicious areas via acoustic detection, then precisely locate the leakage point center with a correlator.

▪ Suitable as a rapid partition leakage screening tool: divide high-leakage areas first, then carry out precise inspection.

▪ Prioritize operation at night or during low traffic hours to reduce external noise interference.

Technical Principle

Based on acoustic correlation analysis technology, high-sensitivity vibration sensors are placed at two inspection points at both ends of the pipeline to collect acoustic signals generated by leakage points. Acoustic waves propagate to both ends along the pipeline, resulting in a time difference when reaching the two sensors due to different propagation distances. The main engine of the correlator accurately calculates the specific location of the leakage point by analyzing the time difference of signals, pipeline acoustic velocity and the pipeline length between the two points.

Core Strengths

▪ High leakage point positioning accuracy, with error controlled within 1 meter, solving the fuzzy positioning problem of acoustic detection.

▪ Strong anti-interference ability, effectively filtering environmental noise, suitable for complex scenes such as daytime and busy urban areas.

▪ Adapts to multi-material pipelines including metal and plastic, with better detection effect for deeply buried pipelines than acoustic detection.

▪ No excavation required, equipment can be deployed at existing nodes such as valves and meter wells, with convenient deployment.

Core Equipment

▪ Pipeline Leak Correlator: Includes main engine and two high-sensitivity vibration sensors, supporting acoustic velocity calibration and signal analysis.

▪ Wireless Transmission Module: Realizes wireless data transmission between sensors and main engine, suitable for long-distance inspection.

▪ Acoustic Velocity Calibrator: Precisely measures pipeline acoustic velocity of different materials and media to improve positioning accuracy.

Application Scenarios

Precise positioning of leakage points in urban water supply networks, micro-leakage detection of gas pipelines, leakage screening of industrial park pipelines, recheck of suspicious areas detected by acoustic method, and leakage detection of deeply buried pipelines.

Typical Application Suggestions

▪ Combine with acoustic detection: preliminary screening first and precise positioning later, greatly improving the efficiency and accuracy of leakage detection.

▪ Calibrate pipeline acoustic velocity before inspection, and optimize inspection parameters combined with pipeline material, diameter and medium parameters.

▪ Arrange sensors at hard pipeline nodes as much as possible to reduce signal attenuation and improve detection effect.

Technical Principle

The ground penetrating radar main engine emits high-frequency electromagnetic pulse waves. After penetrating the ground, the pulses reflect when encountering medium interfaces such as buried pipelines, voids and leaked accumulated water. The radar receiver captures the reflected wave signals, and realizes the positioning of underground pipelines, detection of surrounding pipeline defects and leaked accumulated water areas by analyzing the propagation time, amplitude, frequency and other characteristics of reflected waves combined with geological data.

Core Strengths

▪ Non-contact inspection, no need to touch the ground or pipeline, no damage to pavements and pipelines.

▪ Large detection depth, capable of detecting pipelines within 5 meters burial depth, suitable for deeply buried pipeline network inspection.

▪ Can detect pipelines and surrounding geological conditions simultaneously, judging whether pipelines have settlement or void risks.

▪ High inspection speed, continuous mobile detection available, suitable for large-area pipeline network surveys.

Core Equipment

▪ Ground Penetrating Radar: Includes main engine and high-frequency antennas (50M/100M/200M), supporting real-time imaging.

▪ Data Acquisition Terminal: Synchronously stores radar scanning data, supporting on-site preliminary analysis.

▪ Mobile Cart: Facilitates continuous movement of radar equipment, ensuring detection accuracy and efficiency.

Limitations

▪ Greatly affected by underground media; high-conductivity soils (such as saline-alkali soil) attenuate signals and reduce detection effect.

▪ Relatively high equipment cost, requiring professional geological and pipeline knowledge for operation, with a slightly higher threshold.

▪ Sensitive to pipeline materials; strong reflection signals for metal pipelines, while high-frequency antennas are required for non-metal pipelines.

Application Scenarios

Pipeline detection in complex urban geological areas, positioning of deeply buried non-metal pipeline networks, detection of surrounding geological hazards (settlement/voids) of pipelines, detection of pipeline leakage and accumulated water areas, and fine underground pipeline survey before municipal engineering construction.