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SMALL DIAMETER (HDPE) SUBMARINE OUTFALLS

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SMALL DIAMETER (HDPE) SUBMARINE OUTFALLS ( small-diameter-hdpe-submarine-outfalls )

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TABLE OF CONTENTS Page 1. High density polyethylene sewage outfalls................................................................. 1 2. Planning a submarine outfall.............................................................................. 2 3. Submarine route survey........................................................................................... 3 4. Preserving the routing buoys.................................................................................... 4 5. Pipe diameter selection.......................................................................................... 4 6. Consideration of tides and density of seawater.......................................................... 5 7. Selection of the pipe pressure rating and (SDR)....................................................... 5 8. Classification of polyethylene resins..................................................................... 11 9. The importance of ocean hydrodynamics............................................................. 12 10. Stabilizing HDPE outfalls with concrete ballast weights.............................................. 14 10.1 Determination of the spacing of anchor weights...................................................... 14 10.2 Determination of anchor collar weight................................................................... 14 10.3 Anchor design.................................................................................................... 16 10.4 Anchor collars cost at worksite............................................................................ 17 11. Job site for butt fusion and anchor collar attachment................................................. 23 12. Floating, submerging and placing the outfall............................................................. 25 13. Costs. ......................................................................................................... 30 14. Example problem.................................................................................................. 32 13. References........................................................................................................... 36

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