Stormwater Transfer Rising Main

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We are looking at the design of the 250 PE rising main to transfer storm water (pre-screened to 5.0 mm). Length of the rising main 450 m.

Approximately 20% of route length underground installation and 80% - within the basement car park (clipped to walls/ceiling).

Start of route at the existing pump station and end of route - existing storage tank.

Pump duty 50 litres per second vs 45.0 m head. There are quite a few existing services in the basement car park including electrical cables, water pipes, sewer etc.

I would much appreciate advice from the experts on the critical things that we need to consider, any specifications for similar work you can share and relevant detail particularly for the services crossing, walls penetration, pipe holding brackets/ties and any other relevant information.

Thanks and Regards, Iouri

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7 Answers

  2. Hi Louri,

    I didn't comment on the pipe material as my initial impression that this was not the your original question. However, I agree with Steve's comments.

  3. Hello ,louiri  the focus of the task is clear which is to transfer storm water pre screened at 5mm to N number of meters , 

    Its been stated the following :

    Start of ​route at the ​existing pump ​station and end ​of route - ​existing ​storage tank .     Are you changing the route , pipe network or else ? 

     

    1 Comment

    1. Hi Geovanny, this is a new pipe to transfer storm water from the existing PS to the existing tank. Addition to the existing storm water harvesting scheme to increase supply.

  4. Saw this question but had to wait to reply as couldn't believe what was being proposed. Steve Whipp is absolutely correct. Make sure any buried PE has butt fused joints and where the route is exposed use ductile iron. There are very serious issues with the original proposal and this cannot be recommended.

  5. I would seriously question the use of PE in this situation. It has high creep so would need frequent clips or support and as others have said it would not work well if there is surge. Also there would be need for thrust anchors at bends and fittings. I would suggest an iron pipe would be the best solution. I'm a PE fan and have used miles of it but need to question the wisdom here. 

    1 Comment

    1. Thanks Steve, we are considering all these things and comparing the options with different  pipe material.

  6. Hello Louri,

    I haven't design similar project but I would recommend you consider the following:

    1- Obtain existing record of the building to gain more understanding of where the utilities are.

    2- Carry out non intrusive radar scanning; I have commissioned concrete scanning before to give me an idea of reinforcement in an old structure so this may help in locating services as well. This  link/ company, maybe be able to help or direct you to relevant survey provider:

    https://concretescanningservices.com.au/services/underground-utility-location/

    2- you will need to consider earthling requirement when using brackets fixed to the walls.

    3- Once determining the least intrusive alignment of the rising main then you need to check head loss as you are likely to get lots of bends in the pipe etc.

    4- consider thrust forces on the pipe bends and thrust restraint requirement on both the pipe and the brackets. Also thrust forces transferred to wall.

    Good luck

     

     

     

    1 Comment

    1. Thanks Rania, The good detail survey has been done already. I walked the pipe route with the designers, contractors and suppliers three times. Can you please provide more detail on the earthing requirements for holding brackets? Regards, Iouri