Proper System Design for Well Water Systems

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Jimmym

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Bob NH said:
Engineering is the process of finding economical solutions that meet the customer's needs. There are solutions to all of the "problems" that have been raised.
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Why not make it a constant pressure system too? At this point and complexity, you might as well just go the extra mile. Either cycle stop valve or VSD.
 

Bob NH

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"Why not make it a constant pressure system too? At this point and complexity, you might as well just go the extra mile. Either cycle stop valve or VSD."

Filters exhibit increasing pressure over the life of the filter cycle and the pressure/head characteristic of a submersible pump tends to maintain nearly constant flow. You don't want constant pressure for that application.

For the second stage, there is an occasional very high demand, and long periods of low demand. Constant pressure systems usually involve running the pump whenever there is demand, and running a high flow pump at enough speed to provide the required pressure, when you need only 10% of its flow capacity, is very wasteful of energy.

The first step in designing the proposed system would be an analysis of requirements and cost to determine whether the intermediate tank system system with the extra pump is the right answer. It may be that more pressure tank capacity is the most economical way to meet the need to fill the big tub quickly, and it certainly is simpler.

Simplicity is a very important factor in this kind of application. A second 119 gallon pressure tank would cost about the same as the second pump and storage tank, but it would still be necessary to put the filter and softener before the tank, with appropriate controls, because of the very high flow to the tub. The 119 gallon bladder tanks are only $542 at Grainger.
 

Gary Slusser

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BobNH, how does another allbeit much larger, or a much larger replacement, pressure tank get him flow of 50 gpm? What pressure is required to get him 50 gpm flow into the tub and multiple shower heads from the basement to the 2nd or 3rd floor bathroom?

Is his present pump and pressure tank capable of refilling that new larger tank so he has water for other uses while the shower is running or the tub is filling? I think not but I know fer sure the softener and UV aren't sized for the flow; simply because he is changing the bathroom fixtures and adding to them.

Treating the water with the present equipment, before it goes into an atmospheric storage tank is an option IF the softener is correctly sized now for his present peak demand flow rate; which most are not and I doubt the UV is much more than an 8-12 gpm model. Otherwise the softener is misapplied. IF so, then a new softener is in his future ESPECIALLY if we are running that water into an atmospheric storage tank at open discharge, ot we throttle it back t othe SFR gpm of the softener. And either way, the water in that tank will not hold quality, so treatment after that tank, such as UV, will be required, and that will have to be at 50 gpm. Agreed?

Also, constantly starting and stopping a pump is much more engery deficient than starting it once and allowing it to run until no more water is being used; that is much more energy efficient. Plus it extends the life of the motor/pump.

Gary
Quality Water Associates
 
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