Code for Acceptance of Urban Gas Pipelines ?
The acceptance codes for urban gas pipelines are primarily based on standards such as Code for Construction and Acceptance of Urban Gas Transmission and Distribution Engineering (GB/T 51455-2023) and Code for Construction and Quality Acceptance of Urban Gas Indoor Engineering (CJJ 94-2009). The following are some acceptance specifications from Code for Construction and Acceptance of Urban Gas Transmission and Distribution Engineering (GB/T 51455-2023):
- Warning tape shall be continuously laid along the pipeline route where gas pipelines are buried. Before laying, the surface shall be compacted, and the tape shall be smoothly placed directly above the pipeline, at a distance of 0.3–0.5 m from the pipe top. It shall not be laid within roadbeds or road surfaces.
- When the design pressure of a gas pipeline is ≥ 0.8 MPa, road surface markings shall be provided along the pipeline. Markings shall be set directly above the gas pipeline to clearly and accurately indicate the pipeline’s direction and underground facilities. They shall be installed at pipeline bends, tees, crosses, pipeline ends, etc. The interval between markings in straight pipe sections shall not exceed 200 m.
- During loading/unloading, pipes and equipment shall be strictly prohibited from being thrown, dragged, or subjected to severe impacts.
- The stacking height and environmental conditions (humidity, temperature, light, etc.) for pipes and equipment during transportation and storage must comply with product requirements. Exposure to direct sunlight and rain shall be avoided. During transportation, materials shall be stacked layer by layer, securely tied and fixed to prevent collisions.
- The surface pretreatment of steel pipes before anti-corrosion shall comply with the current national standard Specification for Surface Pretreatment of Steel before Coating (SY/T 0407) and the rust removal requirements of the anti-corrosion materials used for steel pipes.
- The anti-corrosion construction and acceptance requirements for various anti-corrosion materials shall comply with current national relevant standards, such as Technical Code for Corrosion Control of Buried Steel Gas Pipelines in Urban Areas (CJJ 95) and Technical Standard for Asphalt Anti-Corrosion Coating of Buried Steel Pipelines (SY/T 0420).
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