Porto Amboim | 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 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 . 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

8.00 29.50 quay wall and a 630 m breakwater for berthing of Sonangol product tankers Gravel +4.00 in replacement of the offloading CBM +2.00 terminal presently located at the Tie rod - ø 62 mm +1.40 +1.20 (MSL) ±0.00 selected site. It will also add a dry dock Backfill Quarry run for repair and overhaul of construction vessels, supply boats and small coastal Existing soil level tankers up to 150 m in length. The total AZ 20-700 2 -6.00 L = 9.0 m area will be approximately 120.000 m . S 390 GP It will be self-sufficient in terms of power, water and sewerage. The project -10.00 provides a significant stimulus for the -11.00 Quarry stone local economy by tapping into the resources of small and medium-size AZ 50 companies in the region. L = 21.0 m S 430 GP Quay 1 & 2 is 460 m long, and is

-19.00 formed by a steel sheet pile wall with the top level at elevation+4.0 m (LAT). At one end, the perpendicular return wall is 30 m long. A reinforced Soil Layers: seabed level at -4.50 m concrete capping beam constitutes the superstructure, where the equipments, Description Tip SPT such as mooring bollards, stairs and [m] N fenders are installed. The main sheet pile wall is fixed with tie-rods to a sheet Medium & fine sand -10.5 < 18 pile anchor wall. The design of the sheet Coarse sand -21.5 > 50 pile structure was relatively complex Marl & marlstone -30.0 - large capping beam stiffens the sheet pile wall execution of the concrete capping beam. The to finalelevation took place concurrently to the After the installation of the tierods, backfilling centerline oftierods of1.16 m. M72, respectively M80,atadistance between with 62 50 was supported byatierod pairofAZ Every required for the installation of the tierods. +1.30 m (LAT), whichistheelevation platform was excavated to elevation Once the pile driving was finished, the working crane. additional high vertical loads from a heavy lift incorporated in the main quay wall to support 50 guiding template.box Five CAZ piles were panels, whichcorresponds to thelengthof is 8.0 The final embedment of the main sheet piles anchor wall, which is located at 29.5 The mainwall isconnected bytierods to the strongest hot rolled steel sheet pile in the world. template was utilized to install the AZ of theanchorwas completed. Anewandstiffer 50 began21.0 m longAZ after the pile driving The installation ofthemainquaywall madeof hammerIHCS70was used. impact ICE 815Candto reach finaldepth,ahydraulic of thepilesstarted withavibratory hammer to guide the sheet piles during driving. Driving backfilling operation. A simple template was used 9.0 m length, started simultaneously to the Driving oftheanchorwall, anAZ better results, especiallyinquality. driving. This installation method contributes to as the quay core was executed in parallel to the and additionally, itreduces construction time whichisfasterdriving, thanworking from water, allowed usingterrestrial means for thepile the main sheet pile wall. This working sequence distance ofabout11.0 mfrom thealignmentof The edge of this working platform was at a erected withacrest level at+3.0 m(LAT). To speed up installation, a dyke in quarry run was optimize thefinalsolution. worked closelywiththecontractor inorder to The engineering department of AM combinations, anddifferent wave loadcases. and took into account several surcharge load

m. The driving took place in 10.0

mm diameter and upset ends of

20-700 in

CRPS

m behind.

50, the

m long

in 2007andplansto conclude themin2010. The main contractor, Conduril, started the works anodes. lifeservice thatwas assumed for thesacrificial for the period above 25 Furthermore, sacrificialthickness was considered (LAT), in combination with cathodic protection. a concrete capping beam down to +0.0 the main sheet pile wall is treated differently: Due to higher corrosion rates on the water side, 50 years’ designlife (sacrificial thickness). The design considered a loss of steel during the any complementary protection against corrosion. design engineer, theanchorwall doesnot have Despite high corrosion rates assumed by the seabed level, upto elevation -10.0 m. thickness was installed atthebottom ofthe stonea quarry protection layer of 1.0 The dredging went downto and bollards to thesheet pilewall. at the top, and transmits the loads from fenders L-4221 Esch-sur-AlzetteL-4221(Luxembourg) Luxembourgde rue 66, SheetPiling ArcelorMittalr.l.CommercialS.à RPS Sheet piles Structure Engineers Design Contractor Owner PAENAL fabricationyard Porto Amboim|Angola

Walers Tie-rods Total quantities

years, which is the -11.0 m and

m

AZ 50 AZ Quay wall 460mlong WW Consultores deHidráulica eObras Marítimas, (Portugal), SucursaldeAngola Conduril S.A. PAENAL (Porto AmboimEstaleiros Navais LDA), Angola AZ 20-700 AZ CAZ 50 CAZ 2 UPN320 =500MPaø 62mm,upset endsM72/M80,l=19-30m,fy 3 185tofsteel sheet piles&C9/C14connectors m www.arcelormittal.com/sheetpiling e f t

[email protected] 3290 5313 (+352) 3105 5313 (+352) l = l = l = S 235JR 21.0 m 19.6 m 9.0 m S 430GP S 390GP S 430GP 2 605t 525 t 50 t

07.2009 - CS 005 Paenal- EN