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Gravity generated water pressure?

David Nadle
David Nadle Member Posts: 624
in THE MAIN WALL
How were they going to fill the tank?

Comments

  • Unknown
    Unknown
    Sent to me by a friend...

    I get the most interesting questions thrown at me...Can anybody answer?


    "If you have a 1500 gallon tank and want to create 50 lbs of inlet pressure to a plumbing system, how high above the point of use does the tank have to be assuming 3/4 inch supply line? How much does the pressure drop with lowering of the amount in the tank?
    I found a water supplier who will deliver to me out on the property and will deliver up to 1600 gallons at a time. The floor of the trailer is 24" off the ground and the sink is 24" above that. The shower head is 72" inches above floor level or 8 feet above the ground level. How much gravity pressure does it take to deliver water 8 feet above ground level?"
  • bob_46
    bob_46 Member Posts: 813
    Pressure

    2.31' of elevation= 1psi

    There was an error rendering this rich post.

  • Unknown
    Unknown
    You know something?

    I knew that! Duh... LOL!!

    I don'tthink they're going to like the answer though. ;)
  • David Nadle
    David Nadle Member Posts: 624


    Why not just use a pressure booster?
  • Plumdog_2
    Plumdog_2 Member Posts: 873
    .433 psi per ft of water column

    Makes no difference what diameter of pipe or storage tank. So to get 50 psi, your water level has to be 50/.433 or 115.48 ft above the point of delivery (faucet).
  • Unknown
    Unknown
    yup,

    someone else came up with 115 ft too. I came up with 123.5 using 2.31 but then I figure in an extra 8' for the level of the shower nozzle. Same difference when your tank needs to be over 100 feet high. LOL...

    I guess this is for a hunting cabin in the woods. Plenty of trees but none of them have outlets for some reason. ;)

    That's an old joke for the girls, "Can we bring our hair driers?" "Sure, long as you can find a tree with an outlet to plug them into."
  • Unknown
    Unknown
    Say,,,

    that's a good question! I'll have to ask.

    Or better yet, read the third sentence of the question again. I assume the water supplier will have a pump? Maybe not though. There'll be a big surprise in store if the supplier relies on gravity to empty the truck.
    The discussion has turned to 12v RV pumps BTW, seems 100 ft high tanks are a bit of a snag in the plan. ;)
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