South Pars Gas Field Development - Phases12 : Engineering, Supply, Construction and Installation of Marine Pipeline of Seawater Intake System
|Client: DAELIM-KAYSON-SAZEH JV --- Status: COMPLETED|
In order to supply seawater for cooling onshore facilities of South Pars Phases 12, located at south of Iran east of Kangan Port, a seawater intake systems is being developed by joint venture of Daelim, Sazeh and Kayson (DSK).
In this seawater intake system, seawater is collected at the basin through two 2m/length1200m high density polyethylene (HDPE) pipes.
Warmed discharge water returned to the sea using an approximately 200m length outfall HDPE pipe.
Delta Offshore Technology (Delta) as one of the leading offshore companies in Iran accomplished the installation engineering, procurement, construction and installation operations of the offshore part of the SPD12 seawater intake system Seawater intake systems filter fishes and other particles in the seawater and collect only clear water from the sea floor, without installing structures which might affect the sea environment.
In the seawater intake system the difference in water level causes seawater to flow into the intake pipe and collect clear seawater in the Sea water intake Basin at onshore.
In this project ballasting weight of the pipelines is provided by injecting grout inside the core-tube pipes inside the HDPE pipes. This method has the benefit of having ballasting weight uniformly distributed along the pipeline.
While, conventional ballasting weights exerts local load to the pipeline which is not favorable.
This method also reduces the drag forces and accordingly decreases the pulling force needed during the towage operation. HDPE pipelines are fabricated onshore, towed to the location and installed using the float and sink method.
They have been laid in a trench and backfilled to be protected from exposure to any danger that will cause damage to the pipeline for example ship's anchor drag on the seabed.