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  1. #1
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    What actual water pressure will I be getting?

    scenario 1

    Water tank suspended 4.5m above exit point, run by pe pipe.

    scenario 2

    2 water tanks(1 for hot water) suspended 4.5m above a single exit point(mixer), run by pe pipe

    thanks

  2. #2
    Have you got any cheese Thetyim's Avatar
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    1 foot of head = 0.433 psi

    1.0 psi = 2.31 feet of head




    So about 6 psi

  3. #3
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    Water tank

    Is your stand and tanks already built?

  4. #4
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    Quote Originally Posted by Thetyim View Post
    1 foot of head = 0.433 psi

    1.0 psi = 2.31 feet of head




    So about 6 psi
    no difference between the 2 scenarios?

    reason i asked is there's a flow chart for the mixer which says function guarantee above 0.85-1 bar

    but there's water flow below this pressure.

    so it the function is not guaranteed at 6psi. but i dont know if it will be a trickle or sufficient for shower

    any expert can advise?

    thanks

  5. #5
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    Quote Originally Posted by thairanat View Post
    Is your stand and tanks already built?
    no. are you building or any advice?

    thanks

  6. #6
    Have you got any cheese Thetyim's Avatar
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    Quote Originally Posted by wanna
    no difference between the 2 scenarios?
    Same pressure if I have read the question right.

    Both examples have the same head of water so will have the same pressure.
    Having two supply pipes to the outlet will increase the flow rate but will not increase the pressure

  7. #7
    Have you got any cheese Thetyim's Avatar
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    At 6 psi your shower will be slow and will stop if another faucet is opened in the house.

    Either builld a taller tower or add an electric pump
    Pumps are cheaper than towers

  8. #8
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    Quote Originally Posted by Thetyim View Post
    At 6 psi your shower will be slow and will stop if another faucet is opened in the house.

    Either builld a taller tower or add an electric pump
    Pumps are cheaper than towers
    water tank on rooftop

    no electricity so cannot use pump

  9. #9
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    Quote Originally Posted by Thetyim View Post
    At 6 psi your shower will be slow and will stop if another faucet is opened in the house.

    Either builld a taller tower or add an electric pump
    Pumps are cheaper than towers
    hi thetyim

    how about 3/4" pipe running from tank to mixer, and then 1/2" pipe from mixer to shower

    can increase pressure this way? or still increase water flow only?

    thanks

  10. #10
    Have you got any cheese Thetyim's Avatar
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    Well if you have no electricity in the building then you will have to get a higher tower.

    How does the water get up into the tank or is it rain water ?

  11. #11
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    Quote Originally Posted by Thetyim View Post
    Well if you have no electricity in the building then you will have to get a higher tower.

    How does the water get up into the tank or is it rain water ?
    planning to use a diesel pump to draw water from a pond about 250m away...downhill.

    have read on the internet it's best to install the pump at the source as it's easier to push water uphill than to install the pump at the base of the house and try to pull it uphill

    would appreciate your comments on the type and power of the pump that i will need

    thanks

  12. #12
    Have you got any cheese Thetyim's Avatar
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    BlackGang can answer that one.
    He will need to know the total lift needed not just the distance

  13. #13
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    Quote Originally Posted by Thetyim View Post
    BlackGang can answer that one.
    He will need to know the total lift needed not just the distance
    Irrigation Water Pumps

    seems like i need a centrifugal vertical turbine submersible

    the vertical drop is about 100m
    horizontal about 200m

    actual distance about 250m

    plan to run the pump about 1hr a day(or once a few days) to fill up 2000l on the rooftop

    i have seen electric pump from grunfos?, mitsubishi and hitachi

    diesel pump from honda and the popular china brands being used here.

    is the info sufficient to calculate total lift?

  14. #14
    Have you got any cheese Thetyim's Avatar
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    Quote Originally Posted by wanna
    the vertical drop is about 100m
    Quote Originally Posted by wanna
    draw water from a pond about 250m away...downhill.
    Just clear this for me first
    The tank is 100metres higher than the pond ?

  15. #15
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    Red face

    Quote Originally Posted by Thetyim View Post
    Quote Originally Posted by wanna
    the vertical drop is about 100m
    Quote Originally Posted by wanna
    draw water from a pond about 250m away...downhill.
    Just clear this for me first
    The tank is 100metres higher than the pond ?
    yes approximately...the pond is downhill from the house..would that be a big problem?

  16. #16
    Have you got any cheese Thetyim's Avatar
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    I have a deep bore well and the lift to my 2000 litre tank is about 100 metres, so that is very similar to your requirements.
    I use a 2HP submersible electric pump

  17. #17
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    Quote Originally Posted by wanna
    Just clear this for me first The tank is 100metres higher than the pond ?
    OK, how far will the lift be, thats from the lowest pump setting to the lowest water level that you will have, the surface of the water, dont matter how deep it is.

  18. #18
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    as Thetyim said, two tanks will not increase your pressure, just may increase the flow rate

    a cheaper alternative would be to use 1" pipe from the tanks; you would get the same pressure but a much better flow rate. You can reduce the pipe size when you get nearer the delivery points

    4.5m of water pressure would be good; quite often 2m is sufficient for showers etc
    I have reported your post

  19. #19
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    Quote Originally Posted by Thetyim View Post
    I have a deep bore well and the lift to my 2000 litre tank is about 100 metres, so that is very similar to your requirements.
    I use a 2HP submersible electric pump
    yes i think 2hp is about right.

    are there any diesel submersible pumps...or do i need to buy a generator to run the electric pump?

  20. #20
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    Ideally, cold water could be lifted (by suction) only a little less than 11 meters (33 ft.) by ANY device or means. This is because of the vapor pressure characteristics of water.
    The suction lift of a commercial pump, however is usually limited to only around 6-8 meters of cold water even when it has been primed. This is because of dynamic energy losses in the pumps. Some specialty pumps are designed for high lift, but they will not do you any good in your desired applicaton because they will always be less than about 10 meters..
    You will need a high speed centrufugal pump(s) installed. One at the spring plus another one part way up the hill , all to develop enough pressure to : (a) push the water up to a 100 meter (310 ft) higher elevation; (b) overdome the fluid flow energy losses in the pipe and fittings (estimate 5%) ; (c) furnish a usable operating pressure (35 psig) at the points of usage.
    Your pump system will need to develop over 175 psig. This will not be found easily. Even two pumps in series at 90 psi each will be hard to find, but they are available from pumping specialists. They might need to be two-stage. Be prepared to see a big price tag

  21. #21
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    Quote Originally Posted by DrAndy View Post
    as Thetyim said, two tanks will not increase your pressure, just may increase the flow rate

    a cheaper alternative would be to use 1" pipe from the tanks; you would get the same pressure but a much better flow rate. You can reduce the pipe size when you get nearer the delivery points

    4.5m of water pressure would be good; quite often 2m is sufficient for showers etc
    thanks..the info is very useful.

    just reading the part about the flow chart for mixer makes me wonder whether anything below 1 bar will be adequate

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    Quote Originally Posted by wanna
    reason i asked is there's a flow chart for the mixer which says function guarantee above 0.85-1 bar but there's water flow below this pressure. so it the function is not guaranteed at 6psi.
    seems like you are getting your units mixed up, don't try to send anything to Mars

    anyone know how to convert old-fashoined psi to bar?

    aha....
    1 pound per square inch = 0.0689475729 bar

    so you have around 0.4 bar, according to Thetyim

  23. #23
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    easier to say

    1bar = 10m head

  24. #24
    Days Work Done! Norton's Avatar
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    Suggest you do a cost trade off. Cost of deisel pumps, generators etc initial and maintenance vs the cost of getting electricity to the site. You may find the long term cost to bring the electricity to the site is better value.

  25. #25
    Have you got any cheese Thetyim's Avatar
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    My water tower is 7 metres tall
    If I turn the pump off then the downstairs shower works fine but the upstairs shower is a trickle
    So 4.5 metres won't give me a shower

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