Design, Engineering, Supply, Construction, and Installation of Marine Pipeline for Seawater Intake System
South Pars Gas Field Development – Phase 19

Project Overview

As part of the South Pars Gas Field Development – Phase 19, located south of Iran near Kangan Port, Petropars Iran (PPI) initiated the construction of an advanced seawater intake system to supply cooling water to the onshore processing facilities.

Seawater Intake System Design

• Intake Pipelines:
  Seawater is conveyed through two 2.0-meter-diameter HDPE pipelines, each approximately 1,200 meters in length, providing a continuous and reliable supply of clean seawater to the onshore intake basin.
• Outfall Pipeline:
  Heated discharge water is safely returned to the sea via a 2.0-meter-diameter, 160-meter-long HDPE outfall pipeline, ensuring thermal dispersion and environmental balance.
• Environmental Protection Measures:
  Advanced filtration and screening systems prevent the intake of marine organisms and suspended particles, ensuring that only clean seawater is drawn from the seabed while safeguarding the marine ecosystem.

Innovative Engineering and Installation Techniques

Delta Offshore Technology applied advanced engineering methodologies to enhance system efficiency, integrity, and installation performance:

• Grout-Injected Ballasting System
  Grout-Injected Ballasting System
  • Grout was injected into core-tube pipes within the HDPE pipelines to achieve uniformly distributed ballast weight.
  • This approach significantly reduced hydrodynamic drag and minimized installation pulling forces compared to conventional external ballast systems, thereby preserving pipeline structural integrity.
• Float-and-Sink Installation Method
  The HDPE pipelines were fabricated onshore, floated to the offshore installation site, and precisely positioned using a controlled float-and-sink technique.
• Trenching and Backfilling
  Pipelines were installed within pre-excavated subsea trenches and backfilled to protect against external hazards such as anchor drag, seabed movement, and mechanical impact.

Project Overview

The project was completed on schedule and in full compliance with stringent technical, safety, and environmental standards. The seawater intake system now delivers a reliable and efficient cooling water supply for South Pars Phase 19, while ensuring safe and environmentally responsible discharge back into the marine environment.

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The system includes two 1,200-meter-long, 2-meter diameter HDPE pipelines for seawater intake and a 200-meter-long HDPE outfall pipe for the return of warmed discharge water to the sea.

Key Project Benefits

This project highlights Delta Offshore Technology’s proven capability to deliver innovative, sustainable, and high-performance offshore infrastructure solutions, reinforcing its leadership in marine pipeline engineering and installation.

• Environmental Compatibility
  Advanced filtration systems and non-invasive installation techniques minimized ecological impact.
• Enhanced Pipeline Stability
  Uniform ballast distribution improved long-term stability and reduced operational risks.
• Operational Efficiency
  Innovative installation methods lowered installation loads and enhanced overall system performance and durability.