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Using Storm Water of DVW Pipe for low pressure transfer

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  1. #1
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    Default Using Storm Water of DVW Pipe for low pressure transfer

    I'm building a fire system for my house to gravity feed from a dam 20m above (200kpa pressure).

    For the flow rate I require and to retain pressure I need a larger bore pipe than I can get in ag pipe.

    Is it possible to use storm water or DVW pipe for doing this, I'm sure I read somewhere they were capable of taking up to 400kpa?

    Thanks

    Chris

  2. #2
    Banned
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    Default

    Just look up the manufacturers spec sheets.

    20 metres will provide about 196 kpa static head, your choice of the connecting fire hose diameter size and length and nozzle size will add to the overall dynamic head loss. It is usual to work to a required flow rate through the nozzle once you calculate these losses. This will then give you the appropiate pipe size.

    Many people also don't think it necessary to calculate the pipe length for friction loss if the pipe is running downhill. This is wrong.

  3. #3
    Old Chippy 6K
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    Default

    Quote Originally Posted by Danny View Post
    20 metres will provide about 196 kpa static head,. . .
    So that'd be 'about' 200 kpa . . .
    Advice from me on this forum is general and for guidance based on information given by the member posing the question. Not to be used in place of professional advice from people appropriately qualified in the relevant field. All structural work must be approved and constructed to the BCA or other relevant standards by suitably licensed persons. The person doing the work and reading my advice accepts responsibility for ensuring the work done accords with the applicable law.

  4. #4
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    Default

    Aaah...yes.

  5. #5
    Resigned SilentButDeadly's Avatar
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    You can get pressure graded PVC pipe for water distribution in quite a range of diameters from 25mm up to 200mm....

    I use this stuff Welcome to Iplex Pipelines Limited
    Joined RF in 2006...Resigned in 2020.

  6. #6
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    Default

    Thanks for the info. I need to run upto 40 sprinklers in total (25 butterfly on the house and 15 impact on a ring 10m out). Adds up to just short of 700L/min if everything is on at once and I need to end up with a minimum 150kpa for the sprinklers to operate.

    I asked a supplier about DWV pipe and they said it wasn't pressure rated. I can get rural poly in 75mm, so I may do that and lay two lengths.

  7. #7
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    Thanks SBD

  8. #8
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    No worries.

    Bear in mind that rural poly is itself quite cheap. But the fitting are very pricey - $20-$30 each. Whereas PVC fittings are only a few dollars....
    Joined RF in 2006...Resigned in 2020.

  9. #9
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    Default Sprinkle sprinkle little star?

    You may be better to use Class 12 Pressure Pipe. 200 kpa (or minimum of 150 kpa) is not a lot of pressure for sprinklers, so if in doubt I reckon that you should go for a larger diameter pipe.

    It would be a mongrel to go to all the effort and expense to set it up and then find that you don't have enough pressure or volume to operate all the sprinklers. If there is a big fire approaching you will want as much water as possible.

    Good luck cobber

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