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The Pipelaying Process continued 8. Complete string sinks until it is ‘caught’ mid water on the MBUs connected above the collars (orpipe; shore-end) with webbing slings at pre-determined lengths. 9. Position the string as close to the last string as possible before venting the MBU’s at the shoreend allowing it to gently rest on the seabed. 10. Continueventingallbagsuntilthestringispositionedon the seabed. 11. Removeblankingflanges. 12. IncreasethelengthoftheMBUs’connectingwebbingslings such that, when a small amount of air is puffed into each MBU it rises to just below the surface of the water. 13. FullyinflateallMBUstojustliftthestringclearoftheseabed, so making it easy for the tirfors to assist with the connection to the previous string. 14. Whenconnectionismade,deflateandremovethebagsfor use with the next string. Fig: 3: Second String Sinking. www.uniquegroup.com 3PDF Image | Use of Buoyancy for Installation of HDPE
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