PDF Publication Title:
Text from PDF Page: 002
5. 6, Environmental Stress Crack Resistance Hydrostatic Design Basis 9 23 C 3.4'F!, psi Color and Ultraviolet Stabilizer Code Test Condition C, 100'C, 192 hr cell 3! 1600 cell 4! 7. PE3408 has a cellclassification of PE345534C, while the Plexco product PE3408is classified as PE345434C. C Black with 2 percent minimum carbon black! Other manufacturers have comparable products with ASTM D3350 classifications. Nipak "Custom HD" Dredging Appficatlons Certain properties of HDPE pipe make it applicable to dredging situations, Use of this pipe can provide cost savings in installation labor and equipment, maintenance, freedom of design, and extended life of pipeline systems. HD PEpipe has a high potential for application in the marine environment because it will not rot, rust, or corrode; conduct electricity; nor support growth of or be affected by algae, bacteria, or fungi; and is resistant to marine biological attachment. Its specific gravity of 0.955-0.957 makes HDPE 70 to 90 percent lighter than concrete, cast iron, or steel pipe, requiring greatly reduced manpower and equipment for transportation and installation. The extremely smooth inside surface and non-wetting characteristic of HDPE result in higher flow capacity and reduced friction loss. For example, a pipe coefficient or "C" factor of 155 is used in the Hazen- Williams formula for fluid flow calculations for HDPE pipe sections. The "C" factor for new steel is 140 and for old steel, 125. Since the "C" factor value is inversely proportional to head loss due to friction, a high "C" value is desirable. Although HDPE pipe can be joined by flanges or compression couplings, the heat fusion technique-butt fusion-is recommended. This process produces a joint of high integrity and reliability that is as strong as the pipe in both tension and hydrostatic loading. HD PEpipe cannot be joined by solvent cernents or adhesives. Another HDPE property that makes it suited to dredging applications is its abrasion resistance, Controlled laboratory tests have shown that HOPE pipe outperforms steel pipe by a ratio of 4 to 1, It can be stored outside for years without danger of damage by ultraviolet exposure because of the carbon black content of the material. The flexible nature of HDPE enables it to absorb impact loads, surge pressures, vibrations and stresses, It can be cold bent in the field to a minimum radius of 20 to 40 times the pipe diameter, and can easily conform to uneven ground contours. All thermoplastic piping materials are affected by changes in temperature. Normal temperature changes do not cause degradation but may affect the physical and chemical properties of the material. It is the general industry practice to characterize HOPE rnatenal at ambient temperature, 73.4 F 3'C!. As temperature increases, long-term strength decreases and vice versa. For example, at 73'F 3'C! HOPE Iong-term strength is 1,600 pounds per square inch psi!; at 120'F 9'C! it is 1,000 psi; and at 50 F 0'C! it is 1,824 psi. The material will soften at 260 F 27 C! and become molten at 475'F 46'C!. Although the temperatures of dredging slurries are usually not extreme, the air temperature and the amount of radiant sunlight heat might be a consideration in some environments. Field Test Preparations The purpose of this field test was to determine the feasibility of using large-diameter HDPE pipe in a dredging application. Smaller diameter HDPE pipe, up to about 12 inches in diameter, has been successfully used in dredging for several years, and its use is becoming more widespread. Preliminary conversations with HDPE manufacturers' engineers indicated that the proposed use of large-diameter HDPE pipe in the discharge line of a dredge was a valid one. For ease and economy of shipping and handling, two 20-foot sections of 30-inch ID 2-inch nominal size outside diameter OD!!, Standard Dimension Ratio SDR! 32.5, Driscopipe 8600 with stubendsandsteelback-upringson eachendwerepurchased,Thesewerefactoryfabricatedanddelivered to the Portland site in early May 1985. Instailatlon TheHDPEpipesectionswereinstalledinthedischargelineofthePortof PortlanddredgeOREGON.The OREGON is a cutter-suction type, non-propelled, 30-inch hydraulic pipeline dredge, with steel hul! and superstructure. Itwas built in1965by Bauer Dredging Company, andrebuilt in1979by Northwest Marine Iron Works, Inc. The OREGON performs dredging in the I ower Columbia and Lower Wilfamette rivers and is capable of handling 2,000 to 3,000 cubic yards of dredged material per hour. Unusually low sediment deposition delayed the dredging effort by several months. Dredging was finallyPDF Image | Dredging Applications of High Density Polyethylene Pipe
PDF Search Title:
Dredging Applications of High Density Polyethylene PipeOriginal File Name Searched:
tamuw86005_part1.pdfDIY PDF Search: Google It | Yahoo | Bing
Development of a solar powered Electric Ship The Electricship website originally started off as a project to develop a comprehensive renewable, affordable, modular electric ship... More Info
Modular Boat Hull Composite The case for a unsinkable, modular composite hybrid boat hull... More Info
MS Burgenstock Hybrid Electric Catamaran Lake Lucerne Unique shuttle servicing Lucerne to the Burgenstock Resort... More Info
Ground Power Unit GPU Powered by Lithium Ion Batteries The goal of the Ground Power Unit is to provide a readily accessible, modular, ready-to-power solution for remote power... More Info
| CONTACT TEL: 608-238-6001 Email: greg@electricship.com | RSS | AMP |