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