T/CASEI 058-2025 Technical Specifications for the Declaring Gas Pipelines in Urban Areas as Unserviceable

Scope

Main technical content: This document specifies the basic requirements, work procedures, evaluation content, and disposal methods for the decommissioning of urban gas pipelines. This document applies to gas pipelines designed in accordance with GB 50028, with a maximum working pressure greater than or equal to 0.1 MPa (gauge pressure), and used for public purposes between gas stations, storage and distribution stations, various gas source stations, and user riser valves, or between gas source stations. This document does not apply to the following urban gas pipelines: a) Long-distance pipelines designed in accordance with GB 50251 and GB/T 34275 before urban gas stations; b) Gas pipelines within gas stations in the gas system; c) Internal gas pipelines of industrial users (bounded by the factory boundary or pressure regulating boxes); d) Intake pipes, riser pipes, and horizontal main pipes of commercial or residential users (bounded by the connection point between outdoor gas distribution branches and intake pipes); e) Accessory facilities such as pipeline valve wells (rooms), pressure regulating stations (including pressure regulating boxes), condensate tanks, and cathodic protection devices. For urban gas pipelines with a maximum working pressure less than 0.1 MPa (gauge pressure), the decommissioning procedures can be implemented in accordance with this document.

Development Information

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