Quick Answer
To prevent water hammer with a pressure tank installation, install an air charge valve to regulate air pressure in the tank, and ensure proper piping alignment and sizing. This includes a slope of at least 1/4 inch per foot to prevent water from flowing back into the tank. A properly sized check valve is also essential.
Choosing the Right Air Charge Valve
When selecting an air charge valve, consider a valve with a minimum 1/2 inch port size to ensure adequate air flow. A valve with an adjustable air charge pressure range of 2-30 PSI is also suitable for most installations. Install the valve after the pressure switch and before the pressure tank to ensure proper air regulation.
Proper Piping Alignment and Sizing
Proper piping alignment and sizing are critical to preventing water hammer. Ensure that the piping is sloped at least 1/4 inch per foot to prevent water from flowing back into the tank. Use a piping material with a smooth interior surface, such as copper or PEX, to reduce friction and prevent water hammer. Additionally, ensure that the piping is sized correctly to prevent excessive water velocity, which can also contribute to water hammer.
Installing a Check Valve
A properly sized check valve is essential to prevent water hammer. Install the check valve at the lowest point of the system, and ensure that it is sized to handle the maximum flow rate of the system. A check valve with a minimum 1/2 inch port size and a flow rate rating of at least 10 gallons per minute is suitable for most installations.
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