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I am grappling with a gravity fed water system and have questions
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[QUOTE="256bits, post: 6643646, member: 328943"] shouldn't it just be hovering around 35 psi, with both valves open Springs are pressure sources, not flow sources, The higher spring would be feeding into the lower spring. That would be for a completely filled pipe from the connection to the house. With only the higher spring connected, the pressure at the connection point would be the head difference of 200 ( 4400 - 4200 ) if the pipe is full to the top. With the lower spring connected and operating, one basically has lost all that 200 feet of head to send water to the house, leaving just the remaining 100 feet of elevation from the connection point to the house. But you said that the pipe is not filled from the higher spring due to its low output. If the pipe is not filled all the way to the top, you do not get the benefit of the 4400 elevation of head, but only that to where the pipe is filled. How do you know it is not filled? It would fill to the 4400 level if you shut off the exit to the pond, and spring 2 is also shut off. Perhaps you are getting head only from where the tank is connected. Not on its own. But if the pipe is full it would depends upon the velocity and pressure head at the connection. If not full then atmospheric pressure. Spring 1, spring 2, pond, house, tank... It is really quite difficult to evaluate since the information is hard to follow. And some confusing statements for the lower spring?? The head is less than the 4400 if the pipe is full, which it isn't, or is it? for how long? The pipe would empty out if 20gpm is going out and only 3gpm entering. [/QUOTE]
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I am grappling with a gravity fed water system and have questions
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