![]() ![]() Your total tank volume is a measure of the tank size required to produce the desired drawdown capacity. The drawdown is not to be confused with the total tank volume. ![]() Essentially, the drawdown is the length of time the pump is protected from shutting on and off. ![]() That volume of water between 50psi and 30psi is the drawdown. At this point, the pressure switch will turn on and activate the well pump until the tank reaches 50psi. ![]() If you are using a 30/50 pressure switch, the pressure will continue to drop down until it reaches 30psi. As water comes out of the tank, the pressure of the tank decreases. It is the volume of water drawn from the tank between the time the pump takes to turn on and off. What is pressure tank drawdown?ĭrawdown is the amount of useable water in the pressure tank. The gauge on in front of the tank indicates when the maximum pressure has been reached and the switch then automatically shuts off the pump. Most households are set up to run with a pressure switch that turns the pump on at 30 pounds of pressure and turn the pump off at 50 pounds of pressure. It informs the well pump when to turn on and when to turn off based on the rise and fall of the pressure within the tank. The pressure switch monitors the pressure in the tank. Pressure tanks are set up to run in conjunction with a pressure switch. How does a pressure switch work on a well pump? When you turn your water on, the compressed air pressurizes the water and pushes it back out of the tank. As the tank fills with water, it compresses the air chamber. Pressure tanks have a diaphragm, also called a bladder, that separates a chamber of air from the water. Shop Pressure Tanks How does a well pressure tank work?Ī well pressure tank uses compressed air to push pressurized water out of the tank and into your home. It also stabilizes your overall household water pressure, so your faucets don't spit and sputter as they wait for the pump to catch up. This requires an expensive replacement that could have been avoided.īy extending the time between the on and off cycles, a pressure tank keeps your well pump from undue wear and tear. Short-cycling puts enormous stress on your well pump and can cause it to prematurely fail. When the well pump is turning on and off too frequently, it is known as "short-cycling". If that on/off cycle is fast, every time you open a faucet the pump will turn on, and when you close the faucet, the pump shuts off. This extends the time between the pump turning on and turning off. The pressure tank holds a quantity of water to draw upon to meet these needs before asking the well pump to kick on. Every time a faucet gets turned on, a toilet flushes, or someone runs a bath, water is demanded from your well. Join John Woodard, our Master Water Specialist, as he discusses what well pressure tanks are, how to size them, and what accessories you need to make sure the tank functions properly.Ī well pressure tank maintains the water pressure in the household and more importantly, protects the life of the well pump. A properly sized pressure tank ensures your household water needs are met and your pump is protected against short-cycling. Pressurized well tanks extend the lifespan of your well pump by preventing rapid on/off cycling of the pump and maintaining water pressure throughout your home. A pressure tank is an integral part of maintaining your well. ![]()
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