Ministry of Housing and Urban-Rural Development Issues New Standards for Safety Inspection of Urban Underground Pipelines
The Ministry of Housing and Urban-Rural Development has recently released the "Technical Code for Safety Inspection of Urban Underground Pipelines," setting clear requirements for the application of non-destructive testing technologies such as ground-penetrating radar.
Underground Pipeline Safety Inspection Enters the "Non-Destructive" Era
Urban underground pipelines are the "lifeline" ensuring city operations. As networks for town gas, water supply, drainage, and heating expand, safety incidents caused by aging infrastructure, third-party construction damage, and geological hazards occur frequently. Normalized and precise safety inspections of underground pipelines have become urgent. The Ministry of Housing and Urban-Rural Development's newly issued "Technical Code for Safety Inspection of Urban Underground Pipelines" (hereinafter referred to as the "Code") sets clear requirements for non-destructive testing technologies such as ground-penetrating radar, marking a new phase of standardized and technical advancement in China's underground pipeline safety inspection work.
Non-destructive Testing: From Invasive Inspection to Precise Diagnosis
Traditional underground utility inspection often relies on excavation for verification, which is costly and inefficient while severely disrupting urban traffic and residents' daily lives. Ground Penetrating Radar (GPR), a non-destructive testing technology, transmits high-frequency electromagnetic waves into the ground and analyzes reflected signals to identify pipe locations, burial depths, and soil defects nearby. It enables precise assessment of underground networks without damaging road surfaces.
The Code provides systematic guidelines for the application of ground-penetrating radar (GPR). For equipment selection, it requires matching radar antenna frequencies to environmental conditions such as detection depth and accuracy. Regarding operational procedures, the maximum antenna movement speed shall not exceed 10km/h, and each inspection length should be controlled within 100 meters. For data acquisition, the Code specifies requirements for key parameters including center frequency, time window, number of sampling points, and trace spacing. Additionally, the Code mandates that GPR inspection results be compared and validated against video inspection findings to ensure the reliability of conclusions.
A tiered inspection system: from census-level screening to detailed examination
The "Regulations" establish a tiered inspection approach combining general surveys and detailed investigations. Ordinary road sections undergo general surveys with radar scan lines spaced no more than 2.0 meters apart. When suspicious anomalies are detected, scan line density is increased or different frequency antennas are used for targeted detailed inspections. This tiered strategy ensures comprehensive coverage while enhancing the accuracy of hazard identification.
Strengthen the detection defense for safe urban operations
Underground pipeline safety inspection is a systematic engineering endeavor. The release of the "Code" elevates non-destructive testing (NDT) technologies, such as ground-penetrating radar (GPR), from optional tools to mandatory requirements, providing a unified technical standard for municipal pipe network assessments nationwide. As the Code is implemented, NDT technologies—including GPR, sonar inspection, and pipe video inspection—will see broader adoption. This shift will move underground pipeline safety management from reactive response to proactive prevention, establishing a more robust technical defense for urban infrastructure safety.