Use of Buoyancy for Installation of HDPE

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Use of Buoyancy for Installation of HDPE ( use-buoyancy-installation-hdpe )

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The Pipelaying Process 1. ConstructstringofHDPEpipeashorecompletewithconcrete collars every few metres 2. Capoffbothendswithblankingflanges 3. Roll/pullstringintowateruntiljustfloating 4. InstallMBUstocollars–asbelow 5. Towtosite–i.e.theendofthepreviouslyinstalledstring 6. Floodpipebyopeningwaterinletontheoffshoreblanking flange until it starts to submerge. 7. Bleedairoutoftheupperventvalveontheshore-endto control the flooding of the pipe. Fig1:Capped-offHDPEpipe,fittedwithdeflated MonoBuoyancyUnits. Fig 2: HDPE pipe is manoeuvred to the end of the previous string, where the MBUs are inflated before the pipe is flooded. www.uniquegroup.com 2

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