Oxfordshire-based HR Wallingford has carried out ship navigation simulation studies to verify the design of the second marine jetty being built at the Tangguh LNG export terminal in Indonesia’s West Papua province. The work was subcontracted by McConnell Dowell Indonesia, the company responsible for the overall design of the second jetty.
The new marine facilities are part of an expansion project that features the addition of a third 3.8 mta liquefaction train at Tangguh. When completed in 2020, the terminal will have an LNG export capacity of 11.4 mta.
As part of its work on the second jetty project, HR Wallingford, an independent engineering and environmental hydraulics firm, conducted a combined fast-time and real-time ship navigation simulation study. The two elements were used to examine navigation to and from the second jetty, towage requirements, limiting environmental operational conditions, anchorage areas and safety exclusion zones.
The fast-time simulation focused on the channel and approaches to the new jetty, and scrutinised different classes of LNG carriers and condensate tankers.
The real-time navigation simulation, which utilised a full mission bridge simulator, zeroed in on the final approaches and LNG carrier turning manoeuvres. Real-time simulation is deemed to be a more reliable tool in this critical zone.
In preparation, HR Wallingford’s expert flow modellers constructed a two-dimensional hydrodynamic model of the area. This was then validated against in-situ flow measurements which had been carried out prior to the study.
HR Wallingford used its Australia Ship Simulation Centre at Fremantle in Western Australia in the real-time navigation simulation part of the verification exercise. Both a local Tangguh pilot and HR Wallingford’s staff pilot were involved in the virtual manoeuvring of LNG carriers in the final approaches to the second jetty, using up to four 55-tonne bollard pull tugs.
McConnell Dowell’s design manager Fabien Cogordan said “Being able to take advantage of HR Wallingford’s fast-time simulation meant that we could conduct over 8,000 channel transits, equivalent to over 25 years of vessel calls to Tangguh, in a matter of minutes of computer processing time.
“Combining this with the real-time navigation simulation provided us with a cost-effective and flexible tool to evaluate and confirm the suitability of the jetty design.”
Construction of the second marine jetty at Tangguh is being carried out by CSTS, a consortium consisting of Chiyoda, Saipem, Tripatra and Suluh Ardhi Engineering.