How Big Of Air Compressor To Blow Out Sprinklers

How Big of an Air Compressor Do You Need to Blow Out Sprinklers?

Choosing the right air compressor for blowing out your sprinkler system is crucial for preventing costly winter damage. Too small, and you'll spend ages with insufficient air pressure; too big, and you might risk damaging your delicate sprinkler heads. This guide helps you determine the appropriate size for your needs.

Understanding CFM and PSI: The Key Specs

Before diving into compressor sizes, let's clarify two crucial specifications:

• CFM (Cubic Feet per Minute): This measures the volume of air the compressor delivers per minute. A higher CFM means faster work and the ability to handle multiple sprinkler zones simultaneously. For sprinkler blowouts, you need sufficient CFM to clear out the water quickly and efficiently.

• PSI (Pounds per Square Inch): This measures the air pressure. While high PSI isn't always necessary, enough pressure is vital to push water out of the longer sprinkler lines. Too low, and you risk incomplete clearing, leaving residual water to freeze and cause damage.

Sizing Your Air Compressor for Sprinkler Blowout

Several factors influence the ideal compressor size:

• Sprinkler System Size: Larger systems with extensive piping and numerous zones will require a more powerful compressor than smaller systems.

• Pipe Diameter: Larger diameter pipes require higher CFM to clear the water effectively.

• Pipe Length: Longer pipes necessitate higher PSI to push water through their length.

• Desired Blowout Speed: If you want a quick and efficient blowout, a larger CFM compressor is preferable.

Recommended Compressor Sizes

While there's no one-size-fits-all answer, here's a general guideline:

• Small Systems (under 10 zones, short pipes): A portable compressor with a minimum of 5 CFM @ 90 PSI should suffice.

• Medium Systems (10-20 zones, average pipe lengths): A compressor with at least 6-8 CFM @ 100-120 PSI is recommended. Consider a larger tank capacity for longer runtimes without frequent refills.

• Large Systems (20+ zones, long pipes): Opt for a more robust compressor with 8+ CFM @ 120+ PSI. A larger tank capacity is highly recommended.

Beyond CFM and PSI: Additional Considerations

• Tank Size: A larger tank (measured in gallons) provides longer runtime between refills, which is beneficial for larger systems.

• Duty Cycle: This indicates the compressor's work capacity. A higher duty cycle (expressed as a percentage) signifies it can handle continuous operation for extended periods without overheating.

• Portability: Consider the size and weight, especially if you need to move the compressor around your property.

Choosing the Right Compressor: A Summary

Selecting the correct air compressor for blowing out your sprinklers involves carefully considering your system's size and complexity. Prioritize CFM and PSI based on the guidelines provided, but also factor in tank size, duty cycle, and portability for a truly efficient and effective sprinkler blowout. Investing in the appropriate compressor protects your sprinkler system and prevents costly repairs down the line. Remember to always consult your sprinkler system's manual for specific recommendations and safety guidelines.