Implementation Guidelines for the Classification and Assessment of the Safety Status of Old Pressure Pipelines - T/XJBX 0177-2026

Scope

Old pressure pipelines are prone to issues such as wall thickness thinning, localized corrosion perforation, crack propagation, weld defect amplification, support and suspension bracket failure, aging of ancillary facilities, and cathodic protection failure due to the combined effects of media corrosion, stress fluctuations, temperature cycling, geological subsidence, external loads, and third-party damage over a long period of time. As the service life increases, the failure mode of pipelines shifts from occasional defects to systematic deterioration, and the consequences of failure may involve media leakage, fire and explosion, poisoning and suffocation, environmental pollution, and public safety incidents, which have a significant impact on the safety of urban lifelines, the safe production of industrial parks, and the resilience of public infrastructure. At the same time, old pressure pipelines have a large scale of inventory, wide distribution, and complex working conditions. It is costly to completely update them and involves significant disruption to operations, urgently requiring the establishment of a risk-oriented safety status grading assessment mechanism to achieve the management goals of "precise identification, hierarchical control, classified treatment, and resource optimization". In engineering practice, the safety management of old pressure pipelines often faces issues such as incomplete data, disjointed inspection and integrity evaluation, inconsistent assessment criteria, unclear correspondence between defect and risk levels, lack of quantitative basis for decision-making, and difficulty in supporting annual governance plans with assessment results. To enhance the consistency and operability of the assessment process, this document proposes implementation key points for the grading assessment of the safety status of old pressure pipelines, covering assessment preparation and data collection, pipeline segmentation and unit division, identificati

Development Information

Related Standards