Do you live in a cold region of the United States? Do you know how to drain a sprinkler system for winter to protect it from the annual freeze? Whether winterizing the sprinkler system or repairing damaged components, you’ll need to drain it. Properly performing a sprinkler drain down helps to prevent damage to the pipes, valves, and sprinkler heads caused by freezing water. Keep reading to learn more about the draining method professional lawn sprinkler companies use to drain sprinkler systems for winter.
How To Drain A Lawn Sprinkler System
You have several options for draining the sprinkler system, depending on the type of drain fitted by the installation team. Before draining, inspect the system and determine the types of drain valves. If you don’t know, contact a local sprinkler system company to find out which type of drain valve you have.
Typically, you’ll have a manual valve, ball valve or automatic drain valve. However, some irrigation systems may require blowing out to drain them completely.
Shut the Water Valve
Start with turning off the water supply to the system by turning off the main valve. You’ll find the water valve close to the water meter. If the irrigation system has backflow prevention valves, you’ll also need to shut it off. Make sure to check the water pressure in the system and it is at around 50 psi before proceeding.
Turn Off the Timer
If your irrigation system has an automated timer, set it to rain mode before draining. If you don’t have rain mode available, turn it off.
Manual Drain Valve
You’ll find the manual drain valves downstream of the zone valves at the lowest points in the system, where the water collects after shutting off the sprinklers. Close the primary valve to the irrigation system. You’ll find it on a separate “T” connection near the water meter.
Open the manual drain valves in each zone to allow the water to drain completely from the sprinkler heads and pipes. For best results, leave the valves open for two or three days.
You’ll open the valves upstream of each zone to drain water from the primary irrigation line. Run one of the sprinkler heads to drain any remaining water in the system until it is fully drained. Ensure you actively monitor the remaining water and adjust the drainage time according to the current temperature in degrees Fahrenheit to guarantee the complete removal of all water.
Automatic Drain Valves
The pressure falls after closing the supply valve, and the water drains automatically. Open the irrigation drain cap between the backflow device and the main valve. This action eliminates any remaining trapped water from the pipes. Lift the sprinkler heads and drain any residual water.
Blowout Draining
The blowout draining method is for professionals. Do not try to DIY the blowout draining method unless you have experience installing and maintaining irrigation systems. A professional landscaper will use an air compressor to force compressed air into the system to blow out the remaining water.
If done incorrectly, this method can damage the equipment, and you might hurt yourself. Consult the manual before attempting any blowout. Many systems can’t handle high-pressure purging, especially if the pressure exceeds 80 pounds per square inch. Call a professional irrigation service in your area to address the problem for the best results and a service guarantee.
The Final Step in Winterizing Your Sprinkler System
If you’re winterizing the system, insulate the components after draining. Cover exposed pipes, sprinkler heads, backflow preventers, and shut-off valves with insulation tape or foam.
Ensure you don’t block drains or vents on the backflow preventers. With proper drainage and insulation, you won’t experience any damage to the system when the cold weather arrives. Also, ensure to drain the excess water and adjust the air pressure accordingly.
Common Mistakes to Avoid When Draining Your Sprinkler System
Properly draining your sprinkler system is essential to prevent damage, but a few common mistakes can lead to costly repairs. Forgetting to shut off the main water supply or overlooking backflow prevention valves often leaves water trapped in the system, increasing the risk of freezing and cracking. Another frequent issue is using too much air pressure during a blowout, which can damage pipes and sprinkler heads—this method is best left to professionals if you’re unsure.
Homeowners also sometimes rush the process, failing to drain all zones completely or skipping insulation after draining. Even with all the water removed, exposed components like pipes, valves, and sprinkler heads can crack without proper insulation. Taking the time to follow each step carefully and ensuring no water is left behind will protect your system from winter damage.
Getting Your Sprinkler System Ready
Once winter is over, give your sprinkler system a thorough check to ensure it’s ready for the warmer months. Start by examining all exposed pipes and components for signs of damage or wear, especially from freezing temperatures. Replace any broken or worn-out parts, such as cracked sprinkler heads or damaged valves.
As you turn the water back on, do so gradually to avoid any pressure issues. Run the system through each zone, checking for leaks, clogs, or uneven water coverage. This is a great time to make adjustments to your sprinkler heads if necessary, ensuring they’re aimed correctly. Lastly, don’t forget to reprogram your timer to match the changing weather and water usage requirements for the season.
FAQs
Why is it necessary to drain my sprinkler system?
Draining your sprinkler system is crucial, especially before winter or periods of prolonged non-use, to prevent water from freezing and causing damage to pipes, valves, and other components. Frozen water can expand and crack pipes, leading to costly repairs.
When is the best time to drain my irrigation system?
Ideally, you should drain your sprinkler system before the onset of freezing temperatures. In colder climates, this is typically done in late fall, while in milder climates, it can be done in early winter. Additionally, if you anticipate an extended period of non-use, such as during a drought or vacation, it’s advisable to drain the system then as well.
Pioneer Underground Lawn Sprinklers | Omaha’s Best Commercial & Residential Sprinkler Systems
Contact Pioneer Underground Lawn Sprinklers to schedule a free estimate on a system install or to find out what you can do to make your existing system more efficient. We welcome commercial and residential clients. And remember, whether you need our services now… or later in the season, Your Healthy Lawn is Our Passion and we are only a phone call away! Call 402-934-7900 to schedule your service.
