Important Note: Winterizing your irrigation system can involve risks, especially if done incorrectly. It’s strongly recommended to consult a professional for this process.
Properly winterizing your Northern VA irrigation system is critical to prevent damage from freezing temperatures. This process should be completed in the fall, prior to the first hard freeze. Below is a step-by-step guide for two common methods: the Blow-Out Method and the Manual Drain Method.
Blow-Out Method
The irrigation blow-out method is a process used to winterize a sprinkler system by clearing all water from the pipes, valves, and sprinkler heads. This prevents freezing and protects the sprinkler system from damage during cold weather. The method utilizes compressed air to expel any remaining water. Here’s how the blow-out method works:
Shut off the irrigation water supply
Turn off the water supply and connect the compressor hose to the mainline fitting (e.g., quick coupler or hose bib), ensuring it is positioned downstream of the backflow device.
Attach the Air Compressor
Use the controller to activate the station or zone that is furthest from the compressor and highest in elevation. Slowly open the compressor valve to allow air to flow into the system gradually.
Repeat for All Zones
Continue blowing air into each zone until no water flows from the sprinkler heads, progressing from the furthest zone to the closest. Avoid running the compressor on dry pipes, as this can create heat and cause damage.
Disconnect the Compressor
After all the water has been cleared, disconnect the air compressor and release any residual air pressure.
Open and Close Backflow Device Valves
Open and close the isolation valves on the backflow device multiple times to ensure no water remains trapped.
Manual Drain Method
The manual drain method for winterizing a sprinkler system involves draining water from the irrigation pipes and components to prevent freezing and potential damage. This method is only suitable for sprinkler systems designed with manual drain valves installed at the lowest points of the piping.
Only attempt the manual drain method if your irrigation system was specifically designed with manual drain valves at the low points of the piping. Attempting it on systems not equipped for manual draining can lead to damage caused by residual water.
Shut Off the Water Supply
Turn off the water supply to the system to prevent additional water from entering.
Open All Manual Drain Valves
Open all manual drain valves to allow water to flow out of the mainline.
Drain Remaining Water Between the Shut-Off Valve and Backflow Device:
Open the boiler drain valve or the drain cap on the stop-and-waste valve to drain any remaining water between the main shut-off valve and the backflow device.
Open the Test Cocks on the Backflow Device
Open the test cocks on the backflow device to release any trapped water.
Drain Sprinkler Heads
If your sprinklers have check valves, pull up on the sprinkler heads to allow the water to drain out of the bottom of the sprinkler body.
Close All Valves
Once all water has drained, close all manual drain valves.
The manual drain method is a straightforward way to winterize your system, but it must be done carefully to avoid any residual water freezing and causing damage. For complex systems or added protection, the blow-out method may be more effective.
Consult an Irrigation Professional
Given the complexities and potential risks of winterizing an irrigation system, consulting a professional is highly recommended. Professionals, like, Superior Sprinkler, have the expertise and equipment to protect your investment, prevent damage, and ensure your system is ready for optimal performance in the spring.