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# 250655 20-May-2019 16:25
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I want to put water tanks about 100m from a house and pump from the tanks. Problem will be lag between turning a tap on and having the pressure I am told.

I am looking at putting in a Greenline PE100 63mm OD pipe (57 ID) between the pump and house and a large pressure tank near the house with a pressure limiting valve from the 63mm pipe to say 20mm into the house. If I set the pressure valve to say 300KPA and have the pump start at say 350KPA and turn off at 500KPA, would this give a constant pressure at the house?

Is 300KPA ok for house pressure?

Plumber wants to put in a second smaller tank closer to the house, which would work, but means 2 pumps, although the one feeding the small tank could be smallish as its just running into a float valve setup. Not keen multiple pumps and stop cock setup.

Any advice most appreciated.

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  # 2241687 20-May-2019 16:36
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Plumber here.

Will the tanks be higher or lower than the house? And what height difference will there be?

Assuming that the tanks will gravity feed to the house. Just stick 1 pump near the house. And consider a pump with an inverter drive motor. I have such a pump on my own house. Pressure is far more stable than what any pressure limiting valve could ever manage.

How will those tanks be filled? / what is their water source?

300KPA is a bit low to be considered true mains pressure. But is still OK for lots of people.

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  # 2241705 20-May-2019 16:55
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Tanks are a little lower than the house and are feed from the house roof catchment, probably 1m lower from the house gutter to the top of the tank, so when they are full there will be fow back to the house.

What pressure would you recommend into the house ( I am sure my plumber will advise that anyway).

I will check the height with the laser this weekend and get some accurate heights.


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  # 2241755 20-May-2019 18:10
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How is the roof water getting to the tanks? Inverted siphon down pipes? (pipes that go down and back up again, meaning that they always hold water?)

Go for around 400 - 500Kpa. Although you need to consider pressure loss from pipes , filters, taps and static head losses.

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  # 2241909 20-May-2019 23:20
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Yes correct, pipes go down under ground then up at the tanks. once I get the heights shot it might make more sense.

Thanks re pressure.

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