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  1. heatherhills

    Maximum Velocity in Gravity Sewer

    Our drainge design software shows that with the slopes we have (approx. 1:5) and with a roughness values of 0.15 mm that we will have velocities in the pipe of approx. 10m/s under gravity conditions. I have spken to a PE pipe mfr. who says 'it can be done' but am looking for something more...
  2. heatherhills

    Maximum Velocity in Gravity Sewer

    I don't have the M&E book handy but I presume that have a recommended maximum velocity of 3m/s or so as you say bimr. What I am looking for is any recommendations as to a pipe type/design that would allow us to use much higher velocities (e.g 10 m/s). I saw a reference in another thread to...
  3. heatherhills

    Maximum Velocity in Gravity Sewer

    bimr, I should clarify. Proposed pipeline is a 450mm OD PE100 pipe with an ID of approx. 397mm. I assume that erosion/abrasion would be the biggest concern but is there any data/literature/recommendations i could use.
  4. heatherhills

    Maximum Velocity in Gravity Sewer

    Has anybody come across a gravity sewer with very high slopes and velocities (approximatley 10m/s). Can it be done?
  5. heatherhills

    Extending Force/Rising Main

    That's great thanks, that's what I thought.
  6. heatherhills

    Extending Force/Rising Main

    We are looking to extend a rising main (forcemain for those in the US) and I need to calculate the additional head on the pump. The rising main will actually be going downhill but will not be flowing by gravity as the friction head loss will be more than the elevation difference. When...

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