Porto Amboim | Angola. PAENAL fabrication yard

Empowering Angola's Industrial Growth with PAENAL Fabrication Yard

PAENAL, Porto Amboim Estaleiros Navais Limitada, is a joint venture between SONANGOL and SBM. The new construction yard will provide the working area required to build offshore structures and will allow for the transformation of former Very Large Crude Carriers (VLCC) to Floating Production Storage Offloading vessels (FPSOs), to support the country’s rapidly developing offshore oil industry. 

The PAENAL fabrication yard is located on the Enseada de Benguela Velha beach site located in the Kwanza Sul province, on the Atlantic shoreline of Angola. The site is approximately 3 km south of Porto Amboim, around 220 km south of Luanda.

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Porto Amboim Angola
Installation du 1er tirant
mise en oeuvre rideau principal
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This new yard is being developed in three distinct phases. Each phase will increase the capacity of the yard, which will comprise at the end a 460 m long quay wall and a 630 m breakwater for berthing of Sonangol product tankers in replacement of the offloading CBM terminal presently located at the selected site. It will also add a dry dock for repair and overhaul of construction vessels, supply boats and small coastal tankers up to 150 m in length. 

The total area will be approximately 120.000 m2. It will be self-sufficient in terms of power, water and sewerage. The project provides a significant stimulus for the local economy by tapping into the resources of small and medium-size companies in the region.

The installation of the main quay wall made of 21.0 m long AZ 50 began after the pile driving of the anchor was completed. A new and stiffer template was utilized to install the AZ 50, the strongest hot rolled steel sheet pile in the world. The main wall is connected by tierods to the anchor wall, which is located at 29.5 m behind. The final embedment of the main sheet piles is 8.0 m. The driving took place in 10.0 m long panels, which corresponds to the length of the guiding template. Five CAZ 50 box piles were incorporated in the main quay wall to support additional high vertical loads from a heavy lift crane.

The dredging went down to -11.0 m and a quarry stone protection layer of 1.0 m thickness was installed at the bottom of the seabed level, up to elevation -10.0 m. 

Despite high corrosion rates assumed by the design engineer, the anchor wall does not have any complementary protection against corrosion. The design considered a loss of steel during the 50 years’ design life (sacrificial thickness). Due to higher corrosion rates on the water side, the main sheet pile wall is treated differently: a concrete capping beam down to +0.0 m (LAT), in combination with cathodic protection. Furthermore, sacrificial thickness was considered for the period above 25 years, which is the service life that was assumed for the sacrificial anodes.