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mike44

Water tank height to provide adequate pressure under gravity

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We are subject to occasional power cuts which means we lose water supply as our house is fed from a well with a pumped supply to a water tank at ground level and a further pump from the water tank to the house.

We plan to install a water tank on a tower to provide water supply under gravity (and hence to provide a water supply reserve, until the tank runs dry, during a power cut).

The maximum water pipe run will be about 30m from the tank and the highest fitting will be a shower about 2m above ground level.

We wish to minimise the tower height for visual amenity and cost reasons.

How high should the water tank be to provide adequate water pressure?

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Bottom of tank 10m above faucet gives 1 bar pressure.

Edited by trogers

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If you're American or Canadian, 30 feet from the shower head to the bottom of the tank will give you 13 psi. Most powered water systems give about 40 psi, needing about a 100 foot tower.

If you just want some water flow such as to fill a bucket, any amount of lift will work because water will run downhill all day long.

Edited by NeverSure

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Water level in tank, every 10 meters above tapping point gives 1 bar. 2 bar is acceptable.pressure. so water level in tank should be 22 meters above ground level. Be sure you use sufficient diameter tubing., and remove inside burrs!

Sent from my GT-I9300 using Thaivisa Connect Thailand mobile app

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Water level in tank, every 10 meters above tapping point gives 1 bar. 2 bar is acceptable.pressure. so water level in tank should be 22 meters above ground level. Be sure you use sufficient diameter tubing., and remove inside burrs!

Sent from my GT-I9300 using Thaivisa Connect Thailand mobile app

I think 1 bar works for a normal home, unless there is a rain shower...lol.

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Water level in tank, every 10 meters above tapping point gives 1 bar. 2 bar is acceptable.pressure. so water level in tank should be 22 meters above ground level. Be sure you use sufficient diameter tubing., and remove inside burrs!

Sent from my GT-I9300 using Thaivisa Connect Thailand mobile app

I think 1 bar works for a normal home, unless there is a rain shower...lol.

water heater won't work with 1 bar!

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"If you're American or Canadian, 30 feet from the shower head to the bottom of the tank will give you 13 psi."

What's the difference if you're not American or Canadian?

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You may not measure in feet and psi.

Even use of a boat bailing pump on 12v battery might be easier and cheaper to set up for low pressure. But Naam inverter and power supply for that would not require any plumbing change and supply same pressure as normal and should be cheaper and better than tower.

As mentioned 1 bar is a dribble rather than a flow in my view.

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Thanks for the helpful and prompt replies.

It's back to the drawing board as I had not realised that the tower would need to be more than 10m high to obtain adequate pressure. Such a tower would be wholly out of place.

It looks like we need to consider the alternative of a back-up power supply.

In this regard any thoughts on how the inverter and battery option compares to a diesel generator with automatic changeover on loss of mains power?

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<script type='text/javascript'>window.mod_pagespeed_start = Number(new Date());</script>

instead of an ugly tower you might consider a back-up power supply by inverter and battery. cost approximately 15-18,000 Baht depending on your pump's capacity.

note: a 12m high tower will give you 1 bar pressure, i.e. you have to run in circles when showering to get wet.

Cheaper than a tower too.

We were quoted 70k for 6 meter tower...hmmmmmm. We just went with the automatics pump instead for 6k. We are not often troubled by powercuts, we shower the old fashioned way.

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Thanks for the helpful and prompt replies.

It's back to the drawing board as I had not realised that the tower would need to be more than 10m high to obtain adequate pressure. Such a tower would be wholly out of place.

It looks like we need to consider the alternative of a back-up power supply.

In this regard any thoughts on how the inverter and battery option compares to a diesel generator with automatic changeover on loss of mains power?

an automatic change-over is quite expensive and a manual generator start at 03.00 a.m. when you want to flush a toilet is not exactly enhancing quality of life ermm.gif

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<script type='text/javascript'>window.mod_pagespeed_start = Number(new Date());</script>

instead of an ugly tower you might consider a back-up power supply by inverter and battery. cost approximately 15-18,000 Baht depending on your pump's capacity.

note: a 12m high tower will give you 1 bar pressure, i.e. you have to run in circles when showering to get wet.

Cheaper than a tower too.

We were quoted 70k for 6 meter tower...hmmmmmm. We just went with the automatics pump instead for 6k. We are not often troubled by powercuts, we shower the old fashioned way.

the OP has a pump; his problems are power cuts.

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Thanks for the helpful and prompt replies.

It's back to the drawing board as I had not realised that the tower would need to be more than 10m high to obtain adequate pressure. Such a tower would be wholly out of place.

It looks like we need to consider the alternative of a back-up power supply.

In this regard any thoughts on how the inverter and battery option compares to a diesel generator with automatic changeover on loss of mains power?

an automatic change-over is quite expensive and a manual generator start at 03.00 a.m. when you want to flush a toilet is not exactly enhancing quality of life ermm.gif

If you're a bit handy you can create an automatic start and transfer for a reasonable cost, have a look here http://www.thaivisa.com/forum/topic/671221-build-a-low-cost-semi-automatic-generator-transfer-switch/

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