Start Date: 20th- Oct-2015
End Date: 10th-May 2016
Mermaid Subsea Saudi Arabia was contracted to undertake an internal pipeline inspection on the 4m diameter GRP pipeline intakes for the QIPP power plant. Samsung had noticed significant restriction in the flow of water into the onshore reservoir. The primary survey was to establish the extent of marine fouling on the internal walls of the GRP pipelines. MSS was further contracted to remove the marine fouling from the pipeline internally and in the reservoir.
The QIPP power plant is situated in a remote area on the East coast of Saudi Arabia. The four Intake pipelines are approximately 1.2km in length and are constructed with glass fiber reinforced plastic. The intake pipelines provide water supply for the cooling system.
Scope of the Work
Internal pipeline Marine fouling removal.
The scope for cleaning the pipelines internally for 1.2km was extremely challenging due to the sensitive nature of the GRP design and deep penetrations required by the divers into the pipeline. Cleaning methods were limited to ensure no damage to the internal walls. The plant also required water to the plant during the cleaning process and therefore complete isolation of the flow was not often obtainable. Specialized brush carts were procured with specialized bristle’s and brushes necessary to remove the various types of marine fouling without any damage to the sensitive internal pipeline wall. These brushes were not readily obtainable on the market and the MSS team were required to hand make/modify what was available to ensure the correct product was utilised and no damage was inflicted to the delicate GRP surface. Divers were required to penetrate long distances into the pipeline to brush the walls and then dredge all the settled marine fouling. The plant was online continuously throughout the cleaning process. No loss of production resulted from the MSS team throughout the cleaning process.
Marine fouling removal from onshore Reservoir.
Approximately 1500 cubic meters of dead marine fouling was removed from the onshore reservoirs. A challenging task given that the wall of the reservoir are 8m above the water level and the reservoir depth of -10msw. Divers utilizing airlifting techniques and specialized alluvial pumps were able to remove all the fouling form the reservoirs and intake screens. No production time was lost to the plant due to the work undertaken by MSS.