Like for example in a water distribution system of a subdivision, if the water supply was shut off for an hour or longer, is there still a water pressure on the sysytem or pipelines? If yes, how & why?
2007-07-31 21:03:06 · 6 answers · asked by Robert G 1 in Science & Mathematics ➔ Engineering
as long as there is water, there is pressure because of gravity as we know that water will settle to a lowest point.
for your example in subdivision water system if you shut down the supply there is still a pressure inside the pipe that is called Static Pressure. you can determine the pressure inside the pipe by calculating the difference between the highest and lowest point of the pipeline multiply to g (g is the gravity acceleration constant, 9.81 m/s2) and the initial pressure at one end.
2007-07-31 21:46:37 · answer #1 · answered by gostob2 3 · 0⤊ 0⤋
Basic answer: I am assuming that by "shutting off" the water supply, you mean "to shut down the pumping system" and not isolate water supply by valving. Based on this assumption, if the pumps are shut down, the only pressure on the system will be provided by "head" pressure. That means that the point of use will have to be lower in elevation that the water supply itself. Since water does not compress, there would be minimal, if any other that ambient and head pressure in the lines after the pumps are shut down.
2007-08-01 06:38:58 · answer #2 · answered by harbourbug 2 · 0⤊ 0⤋
Kinda Weird Becuase I CAN Actually Taste The Difference In Water.. I Drink: Dasani Nestle Fiji Smart Water And Aquafina. For Some Reason Arrowhead Is Gross lol
2016-05-19 21:54:25 · answer #3 · answered by ? 3 · 0⤊ 0⤋
It depends on what the initial pressure was, why you shut off the system, if there are any leaks in the system, etc. Users could also still utilize the system during the shut off and that would also release water and therefore pressure from the system.
2007-08-01 02:07:44 · answer #4 · answered by Jeffrey S 6 · 0⤊ 0⤋
Pressure is one aspect of the total head in a conduit, called TDH or total dynamic head.
Bernoulli's equations says H = P/gamma + v^2/2g + Z
gamma is density of water and Z is the elevation.
H is TDH in feet
In a water distribution system, the pressure stays high, measured in psi in the US or any other consistent set of units.
If flow =0, the velocity head term is zero. Z is measured relative to the datum, usually mean sea level so it has static head.
2007-08-01 03:22:26 · answer #5 · answered by ruggerjvd 2 · 0⤊ 0⤋
Yes.
This is analogous to your ability to exert a force on the ground, even though you are not falling through the ground.
2007-07-31 21:06:41 · answer #6 · answered by lithiumdeuteride 7 · 1⤊ 0⤋