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Figure7. "Washboarda"ppearanciensideHOPEsectionat endof test Sincewearwasuniformalongthelengthofthepipesectionsb,utwasneitheruniformthroughtimenor aroundtheinterioorfthepipet,herecordsofthetypeandcharacteorfmateriableingdredgedwereexamined. ItwasrecordedthatduringthetimeframeofJanuary15-20w,henLocation7 wasonthebottom,2-incshmooth riverrockandpeagravelmadeupabout10percenotftheslurrybeingdredgedT.hevelocitynecessartyo transportthisheaviemrateriawlasbetween20and26fps.Theincreasedvelocityalongwiththelargersized materialwould be expectedto cause increasedwear in any type of dredgepipe, and the greaterwear at Location 7 was attributed to this. Test Conclusion ThepurposeofthistestwastodeterminehowHDPEpipeperformsinanabrasivefieldsettingT.hesands oftheColumbiaRiverandthevelocitiesnecessarytotransportthemcancauseexcessivewearondredge pipeandequipmentl.twasnottheintentofthistesttoevaluatedifferengtradesofpolyethylenpeipeor differentmanufacturersp'roducts.NorwasitpossibletocomparenewHDPEpipetonewsteelpipebecause newsteelpipewasnotavailableinthepipelineatthetime. The informationobtainedduringthe dredgingseasonwas sufficientto indicatethe usefulnessof large- diameterI-lDPEpipein dredging.Wear,in this case,was moredependentupondredgedmaterialtypethan upontimeorvolumeofslurrypumpedT.hepipewaseasilyrotatedsincethepipelinewasmovedanddeployed manytimesduringthedredgingseasonA.lthoughlonglinesofbutt-weldeHdDPEpipearethemostefficient applicationth,edredgeoperatowrasabletousethequick-connejcotintsandeasilyincorporatteheHDPE pipe into the existing discharge line. ThesectionsofHOPEpipewillbeusedandmonitoredforasmanydredgingseasonsaspossiblebefore failure,The type and causeof failurewill be documenteda,nd usinginformationof the historyof the performancoefsteeldischargeline,anattempwtillbemadetoestimatecostdifferencebsetweensteeland HDPE pipe usage. HDPE Users' Views DredgeoperatorhsaveusedHDPEpipeformanyearsM.ostareverypleasedwiththemateriaalnd,when eithersteelor HDPEpipecan be used,preferHDPEto steelfor a varietyof reasons.An informalsurveyof someHDPEpipeuserswasconductedto gain,fromtheirexperiencest,he helpfulhintsandcautionsof HDPE pipeuse,ingeneral,theseoperatorshavebeenusingHDPEpipefor3-6yearsandarestillusingmostofthe 10PDF Image | Dredging Applications of High Density Polyethylene Pipe
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