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:
| Parameter | Value |
|---|---|
| Diameter | φ406×8mm |
| Material | L360M steel |
| Design Pressure | 4.0 MPa |
| Operating Pressure | 2.0 MPa |
| Content | Natural gas |
| Coating | 3PE anti-corrosion |
Project Timeline & Stakeholders:
- Client: China Railway 16th Bureau Group Co., Ltd.
- Duration: June 15 – July 20, 2021
- Location: Fuzhou City, Fujian Province
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