How Do You Install a Second Pressure Tank?

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  #1  
Old 07-07-03, 12:41 PM
swegman
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How Do You Install a Second Pressure Tank?

I have a well and pressure tank that supplies water to my geothermal HVAC system that heats and cools the house. The water flow requirement for the HVAC units is 24 gallons per minute.

I wish to add an irrigation system. Originally, I was going to tie into the pvc line from the pressure tank to obtain the water for the irrigation system. However, the well pump dealer advises that I install a second 100+ gallon pressure tank that would supply water to the irrigation system.

First question is, is there any advantage to adding a second pressure tank? The well pump dealer quoted approximately $1,000 to install a second tank.

Second, how would the tank be installed so that the well pump tuns ON when the first tank (supplying water to the HVAC) or the second tank (supplying water to the irrigation system) requires re-filling, but that the second tank is not drained when the HVAC system operates and depletes the water from the first tank? Would a back-flow protector (or other device) be needed?

Thanks
Steve
 
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Old 07-08-03, 02:25 AM
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Cool

Until Ron (Pumpman) Peeks comes along, visit his site at www.peekspump.com and another at www.jessstryker.com for excellent tutorials on wells and pumps.
 
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Old 07-09-03, 04:20 PM
swegman
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no one knows how to do this?
 
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Old 07-09-03, 06:08 PM
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Cool

Specialists in wells-and-pumps can better answer your technical questions, such as Ron Peeks.
The average pro plumber (I'm not one in any case) doesn't deal with wells-and pumps much, unless they're in a very rural area.
Just explore the two sites that I gave you until Ron can help you. He comes in pretty frequently. Patience. LOL
Mike
 
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Old 07-09-03, 10:38 PM
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How Do You Install a Second Pressure Tank?

Hi,
Installing a second tank isn't hard. All you need to do is tee off of the main line and intall the tank. However, the only thing the second tank will do for you is to increase storage. You can't use a checkvalve on the second tank, as the pump won't be able to see the pressure loss and refill the second tank.
I think the question to ask here is whether the pump will support the HVAC system (24 gpm) and an irrigation system at the same time? Irrigation systems use a substantial amount of water, too.
If you one of the lucky ones, and have a well that can support both systems, just tie in after the pump and before the pressure tank.
I hope I understood this question correctly.
Ron Peeks
R.L. Peeks Pump Sales
www.peekspump.com
 
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Old 07-10-03, 05:23 AM
swegman
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The well produces 30 gallons/minute and the Grundfos pump is rated at 25 gals/min at its installation level.

If a backflow preventor (or some other device) is not used, what prevents the water from the first tank to flow into the second tank as the irrigation system draws water from the second tank, and similarly, prevent the water from the second tank to flow into the first tank as the HVAC system is operating?

Further, is there any benefit of having a second tank? I am not clear as to why the irrigation system should not use the existing tank for both HVAC and irrigation purposes. Considering the amount of water the HVAC system uses, the pump is going to have to run with one or two tanks installed.

Steve
 
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Old 07-10-03, 07:20 AM
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How Do You Install a Second Pressure Tank?

That was the point that I was trying to make. Other than giving you extra storage, there is no advantage to using the second tank.
It sounds like the well pump pretty much runs all the time, at least when the HVAC is in use.
If you use a checkvalve before the 2nd tank, it will prevent the HVAC from using the water in that tank. However, once the irrigation system comes on line, the pressure will drop, the checkvalve will open immediately (from the pump pressure on the back side of it) and there will be no drawdown from the 2nd tank, basically negating it's existance (except for the extra storage, which will be useless because the checkvalve will prevent flow out of the tank).
Me thinks anyway......................
Ron
 
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Old 07-10-03, 07:29 AM
swegman
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Thanks. You confirmed what I thought.
Steve
 
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