Client:
Oman Tank Terminal Company
Main Contractor:
China Petroleum Pipeline Engineering Company
Main Contractor:
China Petroleum Pipeline Engineering Company
Project Year:
2022
Scope of the Project
- Supply of Concrete ballast blocks, blocks, diffuser protection and rocks for required backfilling
- Butt fusion welding of 1.8km of OD900mm and 0.8km of OD250mm pipe
- Offshore dredging and onshore excavation
- Installation, testing and commissioning
Union Dredgers successfully completed the commissioning of a subsea intake and outfall pipeline. UDMCs scope of work included:
- Supply of Concrete ballast blocks, blocks, diffuser protection and rocks for required backfilling
- Butt fusion welding of 1.8km of OD900mm and 0.8km of OD250mm pipe
- Offshore dredging and onshore excavation including necessary sheet piling and dewatering works
- Installation of offshore and onshore pipelines including concrete ballast blocks and flanged connections
- Installation of chlorination and hydro burst pipelines
- Installation of diffusers and intake screens
- Backfilling of trenches in accordance with the approved cross section utilizing imported and natural fill
- Testing and Commissioning
Project Scope and Execution
- Welding of HDPE Pipes: The project began with the welding of 1600mm HDPE pipes, a crucial step in ensuring the structural integrity and longevity of the subsea pipeline. UDMC’s team of skilled welders used state-of-the-art equipment to guarantee precision and reliability in every joint.
- Hydrostatic Testing: Following pipe welding, hydrostatic testing was carried out on the pipe spools to verify their strength and ability to withstand pressure. This testing was vital to ensuring the pipeline’s operational safety and performance.
- Concrete Collars and Pipe Launching: To secure the pipeline and protect it against external pressures, UDMC undertook the installation of concrete collars. These collars helped to stabilize the pipeline in the trench and were a critical element during the pipe launching process.
Dredging of Pipeline Trench: In accordance with approved levels, UDMC performed dredging to create the necessary trench for the subsea pipeline. This operation was executed with meticulous attention to detail, ensuring the trench was prepared for the proper installation of the pipeline.
Diving and Survey Operations: Diving teams were deployed throughout the duration of the project for subsea operations, including the survey of the pipeline route. Their work was essential for the accurate placement and alignment of the pipeline along the seabed.
- Installation of Pipeline: With the trench and preparatory work completed, UDMC’s team undertook the careful installation of the pipeline into the prepared trenches. This step required precise coordination between the on-site team and the diving crew to ensure accurate placement.
- Outfall Diffuser System: As part of the final installation, UDMC supplied, fabricated, and installed the outfall diffuser system.
- Backfilling of Pipeline Trench: Once the pipeline was in place, the trench was backfilled using a mixture of imported gravel, rocks, and natural fill. This backfilling process helped to protect the pipeline and maintain the structural integrity of the seabed.
- Disposal of Excess Natural Fill Material: Finally, UDMC was responsible for the proper disposal of excess natural fill material, ensuring that the site was cleared and restored in compliance with environmental regulations.
Conclusion
The successful completion of the 2km subsea TSE outfall pipeline is a testament to the careful planning, execution, and expertise of UDMC. The project was meticulously executed to meet both technical specifications and safety standards. The project has now provided a crucial piece of infrastructure for the disposal of treated sewage effluent, contributing to the overall improvement of environmental sustainability and public health in the region.
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