Quick Answer
Pressure tanks need to be primed before use to push water through the system and establish a working water pressure. This is necessary because air can enter the tank when water is shut off or drained, creating a vacuum that prevents water from flowing. Priming the tank ensures a constant water supply.
Why Air Enters the Tank
When water is shut off or drained from a pressure tank, air can enter the tank through the fill valve or other openings. This is because water is no longer pushing the air out of the tank, and the air is now free to enter. If left unchecked, this air can accumulate and prevent the tank from working properly.
The Importance of Priming
Priming the tank involves filling it with water to push the air out and create a working water pressure. This is typically done by opening the air valve and allowing water to flow into the tank until the air is displaced. To prime a tank, you’ll typically need to allow at least 5-10 gallons of water to flow into the tank before closing the air valve.
Techniques for Priming
One common technique for priming a tank is to use a hose attached to a water source, such as a well or municipal water supply. The hose is inserted into the air valve, and the water is allowed to flow into the tank. As the water flows, the air is displaced, and the tank is primed. Another technique is to use a submersible pump to push water into the tank, which can be more effective for larger tanks.
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