Run Two Air Compressors Together: A Step-by-Step Guide

Yes, you can absolutely run two air compressors together to get more air volume. This is often called “staging” your compressors. It’s a great way to boost your CFM (cubic feet per minute) for demanding tools without buying a single, massive unit. You’ll need a way to connect them safely and effectively.

When you combine two compressors, you essentially create a larger air supply. This is perfect for tasks like sandblasting or running multiple air tools at once. It’s a smart solution for workshops or garages that need more power. Many DIYers and professionals find this method to be both cost-effective and practical.

• Connect two compressors for more air volume (CFM).
• This is often called “staging” compressors.
• It’s ideal for high-demand tools.
• You’ll need proper fittings for safe connection.

Let’s walk through exactly how you can connect your air compressors to get that extra power boost you need.

Connecting Two Air Compressors for More CFM

So, you’re looking to combine your air compressors to tackle those bigger jobs, huh? It’s a clever way to get more bang for your buck. Instead of buying one giant, expensive unit, you can often get the same or better performance by linking up two of the ones you already have. This process is commonly referred to as “staging” your compressors. It’s all about **boosting your cubic feet per minute (CFM)** output. This extra air volume is a lifesaver for tools that guzzle air, like sanders, grinders, or even running multiple tools at once.

Think of it like this: a single compressor is like a small stream. It’s good for light tasks. But when you need to fill a swimming pool, you need a river. Staging two compressors creates that river effect. You’re essentially making a bigger, more robust air supply. This is a **fantastic solution for serious DIYers or professional workshops**. It’s practical, and research shows it can be more budget-friendly than upgrading to a single, high-capacity compressor (AirToolTalk Forum).

The Basics of Compressor Staging

The core idea behind staging is simple. You’re not just plugging two compressors into the same circuit (please, don’t do that!). Instead, you’re connecting their air outputs to create a shared reservoir. One compressor fills a tank, and the second compressor feeds from that tank, or they both feed into a larger, secondary tank. This keeps the demand off individual compressors and provides a **steadier, higher volume of air**. It’s a bit like having a team of workers passing buckets of water, ensuring a continuous flow.

Understanding CFM and PSI

Before you start connecting things, it’s important to know what you’re working with. You’ll often hear about CFM and PSI. CFM stands for Cubic Feet per Minute, which is the **volume of air your compressor can deliver**. PSI stands for Pounds per Square Inch, which is the **pressure of that air**. When you stage compressors, you’re primarily aiming to increase your CFM. While PSI is important, many staging setups aim to maintain similar PSI levels across both units.

Why does CFM matter so much? Air-powered tools have specific CFM requirements. If your compressor can’t keep up, the tool will perform poorly, or worse, not work at all. Sandblasting, for instance, is a real CFM hog. A single small compressor would struggle immensely. By staging, you can meet those demands. We found that matching compressors with **similar CFM ratings is generally best**, though not strictly required if you understand the flow dynamics.

Safety First: What You’ll Need

Connecting pressurized air systems carries risks. It’s not complicated, but safety must be your **top priority**. You don’t want a hose bursting or a fitting failing. That’s why using the right components is key. Think of it like building a bridge – you need strong materials and a solid design.

Essential Components for Staging

• Air hoses: Make sure they are rated for the PSI your compressors will generate.
• Fittings: You’ll need adapters and connectors to join hoses and tanks. Brass or steel fittings are generally recommended for durability.
• Check valves: These are critical. They prevent air from flowing backward into a compressor that has shut off, which can cause damage.
• Optional: A larger receiver tank: This acts as a buffer, storing more air and smoothing out the supply.
• Pressure gauges: To monitor air pressure at various points in your setup.

Many DIYers opt for pre-made staging kits, which can simplify the process. However, assembling your own allows for more customization. Research and found that ensuring all threads are properly sealed with Teflon tape or pipe sealant is essential for preventing leaks. A small leak can waste a lot of air and reduce your overall efficiency.

Methods for Connecting Your Compressors

There are a couple of primary ways to connect two air compressors. The method you choose often depends on your available equipment and the specific goal you’re trying to achieve. We’ll cover the most common setups here.

Method 1: Using a Single Larger Receiver Tank

This is a very popular and effective method. You’ll need a large air receiver tank, often much larger than the tanks on your individual compressors. One compressor (let’s call it the “feeder”) fills this large tank. The second compressor (the “booster”) then draws air from this tank and compresses it further, or simply feeds into it. A more common and simpler variation is to have both compressors feed into the same large receiver tank. This guide details how to build a complete air compressor system.

Here’s a simplified breakdown:

• Compressor A fills the large receiver tank.
• Compressor B also fills the large receiver tank.
• Your tools draw air from the large receiver tank.

To make this work safely, you’ll need a way to ensure one compressor doesn’t over-pressurize the tank or prevent the other from filling it. Installing a **pressure switch on the main tank** is crucial. This switch will control when each compressor turns on and off based on the pressure in the large tank. You’ll also want check valves on the outlet of each compressor hose going into the tank. Installing a pressure switch on the main tank is crucial for controlling compressor operation.

Method 2: Compressor-to-Compressor with a Boost Tank

This method involves using one compressor to fill the tank of a second compressor. It sounds a bit backward, but it can work if you have specific types of compressors or tanks. The first compressor pumps air into the tank of the second compressor. The second compressor then uses its own motor and pump to further compress that air, or it simply acts as a secondary storage tank for the first compressor.

A more common and effective variation of this is to use a “boost tank” that sits between the two compressors. The first compressor feeds into this intermediary tank. The second compressor then draws from the boost tank. This is often how professional staging systems are configured. It allows for **better regulation and management of airflow**.

The Role of the Check Valve

We’ve mentioned check valves a few times, and for good reason. They are non-negotiable safety components. Imagine Compressor A is running and filling a tank. Compressor B is off, but connected to the same tank. Without a check valve on Compressor A’s output, air could flow backward from the tank into Compressor A, potentially damaging its motor or pump when it tries to start. A check valve acts like a one-way door for air. It lets air flow out but **prevents it from flowing back in**. Many air compressors already have an intake check valve, but you’ll need them on the output lines connecting your staged setup.

Important Considerations for a Successful Setup

Setting up your compressors to work together involves more than just connecting hoses. Several factors will ensure your system runs efficiently and safely. Think of these as the fine-tuning steps that make a race car perform its best.

Matching Compressor Types and Sizes

While you can technically connect compressors of different sizes, it’s often easier and more efficient if they are similar. Ideally, you want two compressors with **comparable CFM ratings**. If one compressor has a much lower CFM than the other, it can become a bottleneck. It might not be able to keep up with the faster compressor, negating some of the benefits of staging. Many sources suggest using two identical compressors if possible for the most straightforward setup and **predictable performance**.

Electrical Load Management

This is a big one. You absolutely cannot simply plug both compressors into the same standard household outlet or circuit. Each compressor draws a significant amount of amperage, especially when starting up. Running two on a single 15 or 20-amp circuit will likely trip the breaker immediately. You need to ensure you have **adequate electrical capacity**. This might mean running dedicated circuits for each compressor or using heavy-duty, multi-outlet power strips designed for workshop tools.

We found that some professional setups use a single, heavy-duty power source that can handle the combined load. However, for most DIY and small shop setups, **separate circuits are the safest bet**. Always check the amperage requirements listed on your compressors and compare them to your home’s electrical panel capacity. Consulting with an electrician is a wise move if you’re unsure about your wiring.

Monitoring Pressure and Temperature

Keeping an eye on your air pressure is vital. Too much pressure can damage tools, hoses, and the compressors themselves. Too little pressure means your tools won’t work correctly. You should have gauges to monitor the pressure in the main tank and potentially at the output where your tools connect. Similarly, compressors can get hot, especially when running continuously. Ensure there is **good ventilation** around both units to prevent overheating. Some experts recommend using larger diameter hoses than you might normally use to help with airflow and heat dissipation.

A Quick Checklist for Staging Your Compressors

Ready to get started? Here’s a quick rundown to make sure you’ve got everything covered:

• Verify Compressor Specs: Know the CFM and PSI of each unit.
• Gather Safety Gear: Get high-rated hoses, proper fittings, and check valves.
• Plan Your Layout: Decide where your compressors and tank will be placed for optimal airflow and access.
• Check Your Electrical: Ensure you have sufficient power and the right circuits or outlets.
• Assemble Carefully: Use thread sealant and tighten fittings securely.
• Test and Monitor: Run the system and watch pressure and temperature closely.

Conclusion

You’ve learned how to connect two air compressors to boost your CFM output safely and effectively. Staging your compressors is a smart way to power demanding tools without buying a whole new unit. Remember, safety first is key, especially when dealing with air pressure. Always use the right fittings, check valves, and ensure your electrical setup can handle the load.

By following these steps, you can create a more powerful air system for your workshop. So, take the plunge, gather your components, and get ready to experience the benefits of a staged compressor setup. You’ll be surprised at the difference more air volume can make!

Frequently Asked Questions

Can I connect any two air compressors, even if they’re different brands or sizes?

Yes, you can connect compressors of different brands and sizes, but it’s often more efficient if they are similar. Ideally, match their CFM ratings to avoid one compressor becoming a bottleneck. Using identical units usually makes for the most predictable performance.

Do I need a special tank to run two compressors together?

Using a larger receiver tank is highly recommended. It acts as a buffer, storing more air and smoothing out the supply from both compressors. This helps maintain a consistent air pressure and volume for your tools.

What are the biggest safety risks when staging air compressors?

The main safety risks involve over-pressurization and component failure. Ensure you have properly rated hoses and fittings, functioning check valves to prevent backflow, and that your electrical circuits can handle the combined load to avoid tripping breakers or causing electrical hazards.

How do I prevent one compressor from running all the time while the other sits idle?

A pressure switch installed on your main receiver tank is essential. This switch controls when each compressor turns on and off based on the air pressure in the tank. It helps distribute the workload and ensures both compressors operate efficiently.

Is it okay to use standard household extension cords for my air compressors?

Absolutely not. Standard household extension cords are not designed to handle the high amperage draw of air compressors, especially during startup. Always use heavy-duty cords rated for the specific amperage of your compressors, or better yet, ensure they are plugged into dedicated circuits.