Thiess Quarterly News, Volume 1, 2005

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Project updateMorwell River Diversion nears completionProject scope of worksThe scope of worksfor the Morwell RiverDiversion has included:• Placing approximately12.5 million m 3 ofengineered fill to forma 3.5km river diversionembankment acrossthe existing mine pit• Constructing fourtunnels under theriver diversion, with acombined length ofapproximately 1.3kmfor the conveyors totransport coal fromthe existing andnew coalfields• Completingassociated workssuch as roadconstruction,installation ofdrainage systems,instrumentation andother miscellaneouscivil work, and• Relocating services.The project, being undertaken by the Roche ThiessLinfox Joint Venture, under an Alliance contract withYallourn Energy, is designed to extend the life ofYallourn’s Mine to 2032 and ensure a sustainablecoal supply for the long-term operation of theYallourn W Power Station, which provides20% of Victoria’s power needs.Project Manager LauriceTemple said the teamhas built the 3.5km riverdiversion embankment,which will raise the river60m above the floor ofthe mine, and is workinghard to complete all finalaspects of the project.“Throughout the project,the team has remainedcommitted to deliveringto our client’s needs andexpectations,” Laurice said.“This has included beingproactive in developing aCompletion Action Plan inSeptember 2004.“This plan has provided acentral point of focus for allparties involved to regularlymonitor progress and ensurethe project remains on track.”As part of these finalarrangements, in the past fewmonths, the team has beenbusy completing:• Bulk earthworks• Relocation of all servicesincluding fire, ash andsewer mains• Topsoiling and vegetationof the embankments andwetlands (40,000 plants),and• Construction of the LowFlow Channel.The Morwell River Diversion Vehicle Crossing.When completed, the Diversion will extend the lifeof Yallourn’s Mine to 2032.Laurice said she is veryproud of everyone who hasworked on the job for theirachievements and dedicationin delivering such a highqualityproduct within thestipulated timeframeand budget.•14THIESS l quarterly news l VOLUME 1 l 2005
Roof raiseDarwin LNG Project raises the roofImagine lifting the roof of theworld’s largest LNG StorageTank with air.Internal workings on the Darwin LNG Storage Tank after the recentroof raising.Recently the tank roof thatmeasures 92m in diameterand weighs approximately1200 tonnes was raisedusing four fans. The liftwas undertaken in aperiod of 10 hours.The domed roof for theLNG Storage Tank wasconstructed at groundlevel concurrently with theconstruction of the steellined concrete secondarycontainment walls. A flexibleseal was then installedbetween the steel lining andthe roof to maintain pressureduring the roof raising.To ensure the roof wasmaintained level duringthe roof raising, a systemof cables was installed tobalance the structure.Maintaining the roof levelwas essential to ensure theseals between the wall linerand the roof remained incontact to minimise air lossat this interface. The fansused for the raising operationwere kept running untilsufficient welding betweenthe roof and the adjacentwalls was completed forstructural adequacy.Thiess Construction MangerPeter Halpin said reachingthe roof raise milestonewas integral to the project’stimely delivery.“The roof lift had to becompleted before thewet season began. Withunpredictable and severestorms heading our way, wewill now be able to constructthe inner 9% nickel alloyproduct containment tankunder the roof without anyinterruption from the weather.”The 47m high tank isexpected to be completedby January 2006. The tankstores 188,000m 3 of LiquefiedNatural Gas at a temperatureof -167 degrees celsius. TheLNG shall be exported to endusers in Japan.•THIESS l quarterly news l VOLUME 1 l 2005 15
Page 1: quarterlynewsVOLUME 1 I 20054 10 18
Page 6 and 7: Project updateGeraldton set for ear
Page 8 and 9: AwardsNew contract awardsGeothermal
Page 10 and 11: WinThiess wins additional$15 millio
Page 13: UpgradesOut with the old and in wit
Page 17 and 18: ConsolidatedSTCJV and Silcar form o
Page 19 and 20: HealthA step in theright directionT

Thiess Quarterly News, Volume 1, 2005

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