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1985 1986 Total 3/4 Final 2/25 9. 126 2,659,741 Pipe On-Line 8/20 8/26 9/25 10/25 11/4 11/8 12/10 12/17 1/9 1/22 2/18 Data Taken 8/20 BASE 8/26, 9/1 10/2 10/30 11/10, 16, 23 12/7 1/8 Pipe Days Out On-Line 8/22 3 9/17 23 10/17 23 10/30 6 11/8 5 12/6 28 12/16 7 12/19 3 1/21 13 1/28 Bottom No. Amount Dredged Cu. Yards 396,880 399,316 436,612 115,783 57,285 330,437 181,025 136,534 138,266 289,878 Table 1. HDPE Pipe Data - Days On-Line and Amount Dredged The assumption was made that pipe wear would be greatest on the bottom, Table 2 lists the amount of material that was dredged when each of the eight locations was located on the bottom. New HDPE pipe of this size has a manufacturer's guaranteed wall thickness of 0.969 inch. The baseline datarevealedthatallreadingsweregreaterthan0,969inchandaveraged1.018inch.Theaccuracyofthe wall thickness gage is+0.005 inch. Table 2. Location on Bottom of HDPE Pipe and Amount Dredge Bottom Number CubicYardsDredged 136,534 181,025 387,722 436,612 115,783 399,316 686,758 Percent of Total 5.13 6.81 14.58 16.42 4.35 15.01 25,82 11JK 1 Total 2,659,741 100.00 Results Thealmost1,760wallthicknessvalueswereexaminedcloselyfortrendsinpipewear.Flangedpipemay experiencegreaterwear due to the turbulencecreatedby the flange at a distanceequal to 4 to 10 pipe diametersfromtheflange.However,wallthinningalongthe lengthof the pipeswas examined,andwearwas relativelyuniformalongthe lengthof the sections.With no measurableflange-inducedwear, the 10 wall thicknessreadingstakenalongthe lengthof eachHDPEsectionwereaveragedto obtainan averagewall thicknessvalueforeachoftheeightcircumferentialocationsforeachofthe11setsofdata.Table3 liststhe wall thicknessmeasurementsat the beginningand at the end of the test for each HDPEsectionand each locationaroundthepipe.Figure3 isa plotoftheaverageoftheTable3 data,andshowsthelocationandextent of wear. A plotofwallthicknessversustimeforLocation1 Figure4!showsthatwallthicknesswasnotlessthanPDF Image | Dredging Applications of High Density Polyethylene Pipe
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