High-Pressure Gas Pipeline Relocation and Pressure Isolation Project

Project Overview

This high-pressure gas pipeline relocation project involves constructing 551m of new pipeline to replace an existing line. The new route runs:

1. Eastward along the north side of a new retaining wall (green belt area) to Yuanmenpu Road
2. Northward along the west sidewalk of Yuanmenpu Road, crossing XB05 Road
3. Connecting to the existing GA1-class pressure pipeline (design pressure: 6.3 MPa)

Key Construction Details:

• New Pipeline Specifications:
  • Material: L360M high-frequency straight seam welded steel pipe
  • Dimensions: D355.6×6.3mm
  • Coating: 3PE reinforced anti-corrosion
• Abandoned Pipeline Protocol: Nitrogen purging + grouting
• Pressure Isolation Works:
  • 2 live gas line plugging points
  • 4 cold cutting sections
  • 4 buttering wall installations

Technical Parameters:

Project Timeline & Stakeholders:

• Client: Hunan Zhongyou Gas Co., Ltd.
• Duration: November 20 – December 20, 2023
• Location: Yuci Road, Liling City, Hunan Province