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  1. #1
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    Default Gal water pipe sizes

    I'm after some gal water pipe, you know, the stuff they used to us in houses 50 years ago

    I'm making a sprinkler system so need to be able to thread the ends for bspt(?) fittings

    Does anyone have a chart or know the nominal bore and wall thickness for say 1/2" 3/4" and 1" water pipe?(ok so I guess the nominal bore is 1/2", 3/4" and 1" but you never know with the brits)

    Google let me down, but maybe I'm just having a bad day.

    Thank you

  2. #2
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    Default

    You have answered your own question nominal bore is 1/2", 3/4", 1".

  3. #3
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    Default

    Well I answered half my own question. I also asked about wall thickness.

    Now maybe its just a standard schedule pipe. In which case I likely could look it up. But I don't know which one.

  4. #4
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    omg its just dawned on me, Bunnings sell the stuff in shorter lengths, even I can measure pipe.

  5. #5
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    Default

    Quote Originally Posted by Stustoys View Post
    omg its just dawned on me, Bunnings sell the stuff in shorter lengths....
    It's also threaded on both ends. Any reason why you want to cut your own BSPT threads?
    Chris

  6. #6
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    Quote Originally Posted by jack620 View Post
    Any reason why you want to cut your own BSPT threads?
    Because I can.
    Hell no!

    Bunnings only sell up to 1800mm. It's likely I am going to want 4 or so 6.5m lengths + possibly some custom lengths. Unless cutting threads has got easier in the last 30 years* I may well use Bunnings pipe for the shorter lengths where I can. But given a 6.5m length of pipe is about the same price($48) as 1800mm threaded from Bunnings ($37+ socket at $2.90) I'm happy to cut a few threads.

    Bunnings 25mm pipe is 27.5mm ID and 33.5 OD Which I am pretty sure is med wall gal pipe.

    * though I've only ever cut pipe threads by hand on 2" pipe. Even though I was young and fit then I didn't enjoy it.

  7. #7
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    Pipe used to be colour coded.

    Green was the lightest, then yellow, then blue which was the usual grade for water pipe. Then red, and I think extra heavy was white.
    Gold, the colour of choice for the discerning person.

  8. #8
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    Quote Originally Posted by .RC. View Post
    Pipe used to be colour coded.

    Green was the lightest, then yellow, then blue which was the usual grade for water pipe. Then red, and I think extra heavy was white.
    Thank you, I will ask next time I am in there, but now that you say that I think I remember the blue on water pipe, which I guess matches up with Med..

  9. #9
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    http://www.atlassteels.com.au/docume...v_Jan_2011.pdf


    If you’re building a sprinkler system, unless it’s for bushfire protection, I would use poly, sooooooo much easier to work with.

  10. #10
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    Well with a quick flick that would seem to pretty much cover things. I will read it all later tonight. Thank you

    Quote Originally Posted by racingtadpole View Post
    If you’re building a sprinkler system, unless it’s for bushfire protection, I would use poly, sooooooo much easier to work with.
    It is for bushfire. I wish I could us poly. I do wonder, can you really melt poly while you are pumping water through it? And if things get that bad were the sprinklers going to make a difference? I guess its not to easy to answer what size pipe, what flow rate, what distance, what temp.... steel is looking better again.

    Maybe poly through the roof cavity with gal risers.....but keeping all the water on the outside would seem a better idea, except for freezing.

  11. #11
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    My EWSS is a 40mm PVC trunk line that runs parallel to the roof ridge line, 20mm poly branches and 300mm long x 20mm gal risers going through the colourbond with a dektite. Each gal riser is fixed to the side of a truss with 3 saddles. Brass butterfly sprinkler on each riser.

    I figure if the fire is hot enough to melt the poly and PVC under the roof the house is toast anyway.
    Chris

  12. #12
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    Default Ewss

    some pics:
    Attached Images Attached Images
    Chris

  13. #13
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    Quote Originally Posted by Stustoys View Post


    It is for bushfire. I wish I could us poly. I do wonder, can you really melt poly while you are pumping water through it?
    Very easily.
    Gold, the colour of choice for the discerning person.

  14. #14
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    So it seems the Brits aren't to blame

    Quote Originally Posted by jack620 View Post
    My EWSS is a 40mm PVC trunk line that runs parallel to the roof ridge line, 20mm poly branches and 300mm long x 20mm gal risers going through the colourbond with a dektite. Each gal riser is fixed to the side of a truss with 3 saddles. Brass butterfly sprinkler on each riser.

    I figure if the fire is hot enough to melt the poly and PVC under the roof the house is toast anyway.
    What spacing are you running on the sprinklers?
    I was planning on using impact sprinklers, though perhaps they take longer then one would like to do 360? I did try and buy some butterflys so I could compare but they didn't have any brass ones at the time.

    Quote Originally Posted by .RC. View Post
    Very easily.
    Fair enough.
    So my (crazy?) idea of a sprinkler inside a water tank to spray down the insides and keep the section above the waterline from melting isn't likely to work either then...

  15. #15
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    Quote Originally Posted by Stustoys View Post
    What spacing are you running on the sprinklers?
    I was planning on using impact sprinklers, though perhaps they take longer then one would like to do 360? I did try and buy some butterflys so I could compare but they didn't have any brass ones at the time.
    They look to be 5m max. Closer in some places, like the hip ends of the roof.

    My worry with impact sprinklers is they need a fair bit of pressure to do their thing. Will you have enough pressure to drive a heap of them? My system has 21 butterflies. Also, you don't want to be throwing a lot of fine spray high into the air. That will just be carried away by the wind. You want large droplets that are heavy enough to fall onto the roof and flood the gutters.

    Posting my pics reminded me what a nightmare it was installing my system. If you can handle the look of gal pipe on the outside of your roof, I would definitely go with that.
    Chris

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