Bonna Indonesia to supply a 500-MW power plant construction project in the Philippines
Consolis design & engineering office and Bonna Indonesia team designed and produced reinforced concrete cylinder pipes (RCCP) for the project. SB Construction Corp recently installed 1.2 km of onshore & offshore RCCP (Nominal Diameter of 3200 mm), including a concrete intake head structure. The achievement is significant since the seawater intake head is the largest Bonna intake head ever made, with a height of 9.5 m and a total weight of 250 tons.
Project Specifications:
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Offshore Bonna Pipes (RCCP) are suitable for underwater projects, especially seawater, as no special protection is required. They are made of Type-V cement, a sulphate resistant cement designed to improve the performance of concrete. All the metallic components, like steel cylinder and reinforcements, are continuously protected by the well-known ‘passivation’ phenomenon provided by the concrete.
Components like intake head, diffuser, and manhole if any, accessories, take the benefits of:
• Appropriate concrete formulation
• Appropriate concrete cover
• Appropriate raw material, especially stainless steel if needed
Due to these properties, the pipes are perfectly matched to achieve a long service life without the need for costly and uncertain devices, such as cathodic protection.
The RCCP’s weight ensures the long-lasting stability of concrete pipes. And because of their stiffness, RCCP are self-supported and can be laid across uneven seafloor areas without costly filling materials. Sections of 2 or 3 pipes are welded onshore and these sections are laid on prepared trench and jointed with O-ring rubber gaskets using hydraulic jacks. Finally, permanent tie-rods designed for this seismic zone are fixed with anchor-boxes and lugs integrated on spools at the level of rubber gaskets. This procedure facilitates the installation of the offshore pipelines.
The Bonna Intake Head is delivered in several parts. It comes with its specific and multipurpose lifting device, integrated chlorination lines and pre-fitted kit to ensure a smooth installation on site. Grids and bolting are provided in 316L stainless steel suitable for seawater, and except for these parts, no metallic ones are left without concrete protection by grouting.
The team received excellent feedback from their customer, SB Construction Corp: “The supply of RCCP pipe for Intake & Discharge Pipeline was found to have satisfactory performance in terms of Delivery, Quality & Easy Installation Method […] The project was successful in fulfilling our site requirements in accordance with project specifications.”
The San Buenaventura power plant in Quezon will be the first coal plant in the Philippines to utilize the state-of-the-art supercritical technology proven to increase operational efficiencies and significantly reduce emissions. Compared to subcritical power plants, supercritical coal-fired power plants operate at higher pressures, leading to higher efficiencies and significant reductions in emissions over the expected life of the plant.
The 500-megawatt power plant is being built by the consortium of South Korea’s Daelim Industrial Co. Ltd. and Japan’s Mitsubishi Corp. The power plant is owned by Meralco PowerGen Corp & EGCO Group.
Photo credit: Bonna Indonesia, EGCO
