To main content

Free span rectification gas pipeline, East Java

The existing live 28" East Java Gas Pipeline runs offshore from the Kangean Block, close to Pagerungan Besar Island, Kangean Islands, Indonesia, through the Madura Strait and onshore via Porong to Surabaya, Indonesia’s second largest city.

During a survey campaign in 2006 initiated by the owners of the East Java Gas Pipeline, PT. Pertamina Gas and PT. Trans Javagas Pipeline, a large number of critical spans were identified, many of which above the threshold for vortex induced vibrations. Boskalis Offshore, through its Indonesian entity PT. Boskalis International Indonesia, was contracted to rectify 799 critical spans by means of installing a total of 804 rock berms. These berms reduce span lengths and prevent that the critical span length will be exceeded within the remaining lifetime of the pipeline.

Support Berm Installation 

For the support berm installation works Boskalis deployed its dynamically positioned fallpipe vessel (DPFV) Seahorse. This vessel, with a carrying capacity of 18,000 tons of rock, is able to position its fallpipe directly above the live pipeline, meanwhile ensuring sufficient vertical clearance to compensate for current and swell. The DP Class II capabilities of the vessel allow for accurate dumping with a minimum of losses resulting in a short project execution time. One load of 1-5' rock was brought from Norway and additional loads were loaded in Indonesia. Rock was supplied by a quarry operating in the inlands of East Java, delivering rock via the road to a temporary stockpile at the port of Paiton. During loading the 1-5' rock was transported by truck from the temporary stockpile to the feeder and via a conveyor belt into the holds of the DPFV Seahorse. The entire temporary supply chain for rock supply, from quarry to Seahorse, was purposely set up for the execution of this project. Prior to commencement of the rock dumping operations, a pre-survey was carried out by Seahorse's ROV, equipped with multibeam echosounders. This survey was used to identify the start and end points of the free spans. Subsequently, the design per span location was prepared and the berms were installed. A post-survey was carried out to ensure that the berms were installed as specified. When the results of the post-survey were satisfactory, the vessel moved to the next position.

Related projects

Selected filters
Taklift_4.jpg

Jotun A

The Jotun A FPSO, a 92,000 DWT FPSO capable of producing 70,000 bpd, began producing in 1999 on the Jotun field (Norway). As part of Vår Energi’s investment in increased oil recovery from the Balder field in the North Sea an upgrade of the Jotun FPSO is required. The Balder Future project will extend the life of the field (PL 001) by 2045, giving Norway’s oldest license a lifetime of 80 years.

Bokalift_1.jpg

L10 -C -D & -G Decommissioning

Neptune Energy Netherlands B.V. (Neptune) has awarded Boskalis the contract for the removal, transport and load-in of three platforms. These platforms are located in the Dutch North Sea,
approximately 90 km west of Terschelling.

Large-190412_-_38.jpg

Borssele ALPHA/BETA

Royal Boskalis Westminster is a leading global marine contractor and services provider. With safety as our core value, we offer a wide variety of specialist activities to the oil & gas and renewa-bles sectors. These activities include marine instal-lation and decommissioning, seabed intervention, marine transport and services, subsea services and marine survey. In addition, Boskalis is a global dredging contractor, provides towage and terminal services across the globe and delivers marine salvage solutions. By understanding what drives our clients we are able to provide the solutions that enable them to meet their specific business goals. For this reason we are constantly looking for new ways to broaden and optimize our offering and are committed to expanding our proposition, supported by our financial strength. With our committed professionals in engineering, project management and operations, 800 special-ized vessels and an unprecedented breadth of activities in 90 countries across six continents we help our clients in the offshore industry push boundaries and create new horizons.

E_-_Tower_Crane_Installation.JPG

Çanakkale 1915 bridge

The 1915 Çanakkale Bridge, also known as the Çanakkale Strait Bridge, is a proposed suspension bridge being constructed in the Çanakkale area in Turkey. Situated just south of the towns of Lapseki in Asia and Sütlüce Village in Europe. The bridge will span the Dardanelles strait, about 10 km south of the Sea of Marmara.

Aberdeen bay offshore windfarm project

Boskalis was responsible for the eleven suction bucket jacket foundations, scour protection, 66 kV inter array and export cables and the installation of the wind turbine generators.

NASR.jpg

NASR full field development

Boskalis was subcontracted to install 2 topsides and 3 jackets in the NASR and Umm Shait oil fields: The Accommodation Platform/AP Jacket, the Separation Platform/SP Jacket and the Gas Treatment Platform/GTP Jacket are installed in the NASR Field. The installed net weights of the jackets ranged from 2,270 to 3,070 metric tons.