Pipeline Hot Tapping and Plugging for CNOOC Gas Pipeline Relocation

Project Overview

This offshore gas pipeline isolation project involves pressure containment operations during the relocation of CNOOC’s gas pipeline for the new Fuzhou-Xiamen railway construction. Key tasks include:

Critical Workscope:

• Installation of DN400 full-wrap isolation fittings (4 locations)
• DN400×350 bypass fittings (4 locations)
• DN50 pressure balance lines (4 locations)
• DN400×20 airbag containment fittings (4 locations)
• 150m DN350 bypass pipeline (2 routes)
• Hot tapping operations:
  • 4× DN400 isolation taps
  • 4× DN350 bypass taps
  • 4× DN50 balance taps
  • 4× DN200 airbag taps
• Non-sparking pipe cutting (4 locations)
• Plugging operations (8 locations)

Pipeline Specifications:

Project Timeline & Stakeholders:

• Client: China Railway 16th Bureau Group Co., Ltd.
• Duration: June 15 – July 20, 2021
• Location: Fuzhou City, Fujian Province