How To Effectively Blow Out Your Sprinkler System: A Comprehensive Guide
How do you blow out a sprinkler system? It’s done by connecting an air compressor to your system and using compressed air to force all water out of the pipes and sprinkler heads, significantly reducing the risk of freezing and bursting pipes during winter. This detailed guide will walk you through the process, ensuring your sprinkler system survives the cold season.
Why Blowing Out Your Sprinkler System Is Crucial
Leaving water in your sprinkler system over the winter can have devastating consequences. As the water freezes, it expands, potentially cracking pipes, sprinkler heads, and backflow preventers. Repairs can be costly and time-consuming. How do you blow out a sprinkler system? It’s a preventative measure that can save you hundreds, if not thousands, of dollars in repair bills.
- Prevents Freezing: The primary goal is to remove all water.
- Reduces Repair Costs: Avoids expensive damage from freezing pipes.
- Extends System Lifespan: Prevents premature wear and tear.
Necessary Tools and Materials
Before you begin the process, gather all the necessary tools and materials. Having everything on hand will make the job smoother and more efficient.
- Air Compressor: A compressor with sufficient CFM (cubic feet per minute) is essential. The required CFM depends on the size and complexity of your sprinkler system. A general guideline is 20-50 CFM.
- Adaptor Fittings: Various fittings are needed to connect the air compressor to your sprinkler system’s blowout port. These vary depending on your system’s design.
- Safety Glasses: Essential for eye protection during the blowout process.
- Wrench: Needed for tightening fittings.
- Screwdriver: May be needed to adjust sprinkler heads.
Step-by-Step Guide: How Do You Blow Out a Sprinkler System?
This is the core of the process. Follow these steps carefully to ensure all water is removed from your system.
- Turn Off the Water Supply: Locate the main water shut-off valve for your sprinkler system and turn it off completely. This is usually located near the water meter or in the basement.
- Locate the Blowout Port: Find the blowout port on your sprinkler system. This is typically located downstream of the backflow preventer.
- Connect the Air Compressor: Attach the appropriate adaptor fitting to the air compressor hose and connect it to the blowout port.
- Adjust the Air Compressor: Set the air compressor to the appropriate pressure. Avoid excessive pressure, as it can damage your system. A pressure between 40 and 60 PSI is generally recommended. Never exceed the sprinkler head manufacturer’s specified pressure limit.
- Open Valves Zone by Zone: Starting with the zone furthest from the compressor, slowly open the valve. Allow the compressed air to force water out of the sprinkler heads in that zone.
- Monitor the Water Flow: Observe the water coming out of the sprinkler heads. Initially, the water will be murky. Continue the process until the water is clear, indicating that most of the water has been removed.
- Repeat for All Zones: Repeat steps 5 and 6 for each zone in your sprinkler system.
- Disconnect the Air Compressor: Once all zones have been blown out, disconnect the air compressor from the blowout port.
- Close All Valves: Close all zone valves.
- Open and Close Sprinkler Heads Manually: Some residual water might remain. Manually activate each sprinkler head to drain any remaining water.
Common Mistakes to Avoid
Blowing out a sprinkler system improperly can cause damage. Here are some common mistakes to avoid:
- Using Excessive Air Pressure: Exceeding the recommended air pressure can damage pipes and sprinkler heads.
- Failing to Protect Your Eyes: Water and debris can spray out of the sprinkler heads during the blowout process.
- Neglecting to Turn Off the Water Supply: If the water supply is not turned off, the air compressor will be fighting against the water pressure, making the process ineffective.
- Skipping Zones: It’s essential to blow out each zone individually to ensure all water is removed.
Alternative Methods
While using an air compressor is the most common method, there are alternative approaches.
- Automatic Drain Valves: Some systems are equipped with automatic drain valves that automatically drain the water when the system is shut off. Check your system’s documentation.
- Manual Drain Valves: Systems might also have manual drain valves that you can open to drain the water.
| Method | Advantages | Disadvantages |
|---|---|---|
| Air Compressor | Thorough water removal, widely applicable | Requires an air compressor, risk of over-pressurizing |
| Automatic Drain | Convenient, requires no manual intervention | Not all systems have them, can fail |
| Manual Drain | Simple, no special equipment required | May not remove all water, requires manual action |
Why Professional Help May Be Needed
While how do you blow out a sprinkler system can be a DIY project, hiring a professional has its benefits. Professionals have the experience and equipment to properly blow out your system without causing damage. They can also identify and address any potential problems with your system before winter arrives.
Frequently Asked Questions (FAQs)
What size air compressor do I need to blow out my sprinkler system?
The size of the air compressor needed depends on the size and complexity of your system. Generally, a compressor that delivers between 20 and 50 CFM (cubic feet per minute) is sufficient for residential sprinkler systems. Ensure the compressor’s PSI (pounds per square inch) rating is adequate, but never exceed the sprinkler heads’ maximum pressure.
Can I blow out my sprinkler system with a shop vac?
While a shop vac can generate airflow, it typically doesn’t provide the necessary CFM to effectively blow out a sprinkler system. An air compressor is the recommended tool for the job. Shop vacs also aren’t designed for prolonged use in this manner and could be damaged.
How much does it cost to have a professional blow out my sprinkler system?
The cost of professional sprinkler system blowout services varies depending on your location and the complexity of your system. Generally, expect to pay between $50 and $200 for this service. Get quotes from multiple contractors to find the best price.
When is the best time to blow out my sprinkler system?
The best time to blow out your sprinkler system is before the first hard freeze of the season. This typically occurs in late fall or early winter, depending on your geographic location. Check your local weather forecasts and plan accordingly.
What happens if I don’t blow out my sprinkler system?
If you don’t blow out your sprinkler system, any water remaining in the pipes and sprinkler heads can freeze and expand, causing cracks and breaks in the system. This can lead to costly repairs in the spring.
How can I find the blowout port on my sprinkler system?
The blowout port is typically located downstream of the backflow preventer. It is usually a threaded connection that allows you to attach an air compressor hose. If you are unsure, consult your system’s manual or contact a professional.
What PSI should I use to blow out my sprinkler system?
It’s crucial to use appropriate pressure, between 40 and 60 PSI is generally recommended, but never exceed the maximum pressure specified by the sprinkler head manufacturer. Using excessive pressure can damage your system.
Can I damage my sprinkler system by blowing it out?
Yes, you can damage your sprinkler system by using excessive air pressure or by not properly turning off the water supply. Follow the instructions carefully and avoid using more pressure than necessary.
How do I know if I’ve blown out my sprinkler system properly?
You’ll know you’ve blown out your sprinkler system properly when clear water comes out of each sprinkler head, indicating that most of the water has been removed. Even then, a small amount of residual water is normal.
What is a backflow preventer, and why is it important?
A backflow preventer prevents water from flowing back into the main water supply, which could contaminate the drinking water. Protecting it from freezing is crucial, as damage to this component can create health hazards.
Do I need to cover my sprinkler heads after blowing them out?
While not always necessary, covering your sprinkler heads can provide an extra layer of protection against the elements. You can use insulated sprinkler head covers or wrap them with burlap.
What if I can’t find the blowout port or don’t feel comfortable doing it myself?
If you are unsure about any part of the process, it’s always best to consult with a professional. They can ensure your system is properly winterized without causing damage.