That tells the water pump to turn on, and water is then drawn into the house and tank. When the faucet is shut off, pressure builds until it is restored to its default shut-off level. The amount of water delivered by the pressure tank between the time the pump shuts down and the time it starts again is called the drawdown.
Pressure tank size and the drawdown will depend on the amount of water the pump can draw into the home in 1 to 2 minutes. Some tanks hold as little as 10 gallons, others more than gallons. The most common size of pressure tanks in residential homes hold about 44 gallons and have a drawdown of about 16 gallons. If your home uses more than the average amount of water or has a well with a low yield, a larger pressure tank may be needed.
Possible Pressure Tank Problems. Advantages: Well water is typically higher in nutrients and minerals. Before city water gets to your home , the water go es through a filtration process to kill parasites, bacteria, viruses, and germs by using chlorine and chloramine.
Well water is free of additives while still maintaining the healthy nutrients and minerals that are good for you. Well water is usually protected from natural disasters that could result in contamination.
Natural disasters , especially floods, can bring water contamination. Ground s and infrastructures are shifted, resulting in an unhealthy increase of contaminants to the water.
If a city is flooded too heavily, a boil order will be issued, and homeowners should not use their homes water. Thankfully, wells are usually immune from natural disasters.
Disadvantages: Well water i s dependent on electricity. Since well water is pulled from the ground using a pump, that pump needs power from somewhere. Thus, the pump runs on electricity. So, if the electricity in your home goes out, the pump will stop working, which means no water.
Your state water-well contractor licensing agency, your local health department, or a local water system professional can provide information on proper well construction. Make sure any water-well drillers and pump-well installers you work with are bonded and insured. If required in your state, make sure your ground water contractor is licensed and certified. Visit the National Ground Water Association to find certified water well contractors near you. The NGWA operates its own voluntary certification program for contractors.
This allows drillers, and well pump installers can receive national training certification on top of state requirements. If your area doesn't have a high water table, or if it lacks a stable supply of potable water near the surface, you must dig deeper to achieve the same result.
And because a deep well means that the water has to be lifted farther, the strategies for moving it change. These days, the most common pump for a shallow well is a jet pump. Jet pumps are mounted above the well, either in the home or in a well house, and draw the water up from the well through suction see Single-Drop Jet-Pump System diagram on next page.
Because suction is involved, atmospheric pressure is what's really doing the work. Think of the system as a long straw. As you suck on the straw, you create a vacuum in the straw above the water. Once the vacuum is there, the weight of the air, or atmospheric pressure, pushes the water up the straw.
Consequently, the height that you can lift the water with a shallow-well jet pump relates to the weight of the air. While air pressure varies with elevation, it's common to limit the depth of a jet-pump-operated shallow well to about 25 ft.
Jet pumps create suction in a rather novel way. The pump is powered by an electric motor that drives an impeller, or centrifugal pump.
The impeller moves water, called drive water, from the well through a narrow orifice, or jet, mounted in the housing in front of the impeller. This constriction at the jet causes the speed of the moving water to increase, much like the nozzle on a garden hose.
As the water leaves the jet, a partial vacuum is created that sucks additional water from the well. Directly behind the jet is a Venturi tube that increases in diameter. Its function is to slow down the water and increase the pressure. The pumped water—new water that's drawn from the well by the suction at the jet—then combines with the drive water to discharge into the plumbing system at high pressure.
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