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Thread: Gal water pipe sizes
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30th Nov 2020, 10:56 PM #1Most Valued Member
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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
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30th Nov 2020, 11:08 PM #2China
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You have answered your own question nominal bore is 1/2", 3/4", 1".
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30th Nov 2020, 11:16 PM #3Most Valued Member
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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.
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30th Nov 2020, 11:39 PM #4Most Valued Member
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omg its just dawned on me, Bunnings sell the stuff in shorter lengths, even I can measure pipe.
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1st Dec 2020, 01:36 PM #5Most Valued Member
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1st Dec 2020, 03:42 PM #6Most Valued Member
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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.
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1st Dec 2020, 04:12 PM #7Pink 10EE owner
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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.
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1st Dec 2020, 04:20 PM #8Most Valued Member
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1st Dec 2020, 05:36 PM #9Most Valued Member
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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.
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1st Dec 2020, 06:41 PM #10Most Valued Member
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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
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.
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1st Dec 2020, 07:02 PM #11Most Valued Member
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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
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1st Dec 2020, 07:09 PM #12Most Valued Member
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Ewss
some pics:
Chris
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2nd Dec 2020, 08:03 AM #13Pink 10EE owner
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2nd Dec 2020, 08:46 AM #14Most Valued Member
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So it seems the Brits aren't to blame
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.
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...
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2nd Dec 2020, 09:20 AM #15Most Valued Member
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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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