PE Pipe Technical Catalogue (PDF) - Pipelife Norge AS

More documents

Recommendations

Info

Pipelife Norge ASPE CATALOGUE-SUBMARINE APPLICATIONS, PIPELIFE NORGE AS, December 2002.the factory, towing it to the site and submerging it into the trench at the river bottom.After submersion the trench was filled with gravel.Fig. 0.1.2.1 Sewerage river crossing.0.1.3 Outfall pipelineTreated sewage water will normally be conveyed into the recipient discharge area at a certain depthand distance from coast. A depth water outlet will provide excellent dilution of the wastewater.Outlet deep will vary in the range 10-60 m dependent of the recipient’s self-purification capacity.The recipient can be river, lake, fiord or sea.The outfall usually starts from an outfall chamber at the waterfront to which the wastewater is lead bygravity or pumping.Use of pumping directly on the outfall pipeline is rather rare and not recommended. If pumping isnecessary, the best solution is to pump the sewage water into the outfall chamber and conduct it withgravity into the recipient.The main task for the outfall chamber is to prevent air from entering the pipeline.Air can cause floatation of the pipe due to buoyancy.It is also necessary to take into account the variations in low tide and high tide when designingan outfall chamber.Special problems to take into consideration regarding outfall pipelines are :− Air entrainment in pipe flow− Bio fouling− Current and wave induced forces− Sediment transportFig. 0.1.3.1 represent an industrial outfall. The figure shows the outfall system to the sea froma steel plant in northern Norway. The main components in the outfall system are :−430 m pre-stressed concrete pipes with a diameter of 1.800 mm buried in the seabed at a waterdepth of 4 m. The sea end of the concrete pipeline is connected to concrete anchor block. Theland end is connected to an outfall chamber.Side 6 av 84
Pipelife Norge ASPE CATALOGUE-SUBMARINE APPLICATIONS, PIPELIFE NORGE AS, December 2002.−90 m PE-pipes PN3.2 with a diameter of 1.600 mm on the steep seabed from the anchor blockon to a depth of 30 m.The PE-pipe was produced, transported 1.200 km by rail and submerged in one piece.PE was selected over other pipe materials, because of its flexibility and because it required very littleconstruction work under water.Fig. 0.1.3.1 Outfall system to the sea from an iron plant.The example above is not very characteristic of an outfall. Usually the PE-pipe starts from the outfallchamber.Side 7 av 84
Page 1 and 2: Pipelife Norge ASTechnical Catalogu
Page 3 and 4: Pipelife Norge ASPE CATALOGUE-SUBMA
Page 5: Pipelife Norge ASPE CATALOGUE-SUBMA
Page 57 and 58:
Pipelife Norge ASPE CATALOGUE-SUBMA
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
show all

PE Pipe Technical Catalogue (PDF) - Pipelife Norge AS

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?