Considerations for your rotary screw compressor solution

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Available with various motors, including fixed speed and variable speed, drivetrains, and sizes, it's important to invest in the right rotary screw compressor solution.

To determine the best set-up, it's typically advised to start with how much air flow you'll need. Additionally, you'll want to consider whether or not you'll use different levels of pressure throughout your day.

As each application has different requirements, there's not a one size fits all approach to air compressors. These variables are why we offer many different models.

The following information is meant to help you understand what to consider when exploring our complete line of products.

Air pressure and size

It's essential to properly determine the right air pressure and size machine for your application. If you invest in equipment that's too big or small, you could end up wasting energy.

In fact, electricity consumption makes up at least 80% of an air compressor's operational costs. Both overworking and underutilizing a machine can cause unnecessary expenses.

To get started, you'll want to think of flow. This factor is how long you'll need consistent air to get a job done. Flow is usually measured in cubic feet per minute (cfm), liters per second (l/s), or cubic meters per hour (m3/h). These measurements are all time based and relate to your workload.

Next, you'll need to consider pressure. Moving heavy objects requires high pressure levels. This factor is measured in pounds per inch (psi) or bar.

The main advantage of any rotary screw compressor over piston compressors is their ability to deliver more flow. These machines also come in larger sizes, delivering greater pressure.

Fixed speed vs. variable speed drive drivetrains

Simply put, rotary screw compressors are built with two screw rotors. With this arrangement, there are many options in how they're powered. Available in belt-drive, gear-drive, and direct-drive models, there's room for increased efficiency and innovation. When choosing between fixed speed and variable speed drive models, you'll find different drivetrains.

We offer fixed speed models with belt and gear drives. With this engine type, it's worth noting that a fixed speed air compressor runs continuously. The main advantage of a gear drive vs. belt drive is that there's no need for tensioning and replacing worn belts. Additionally, these machines tend to be more efficient than belt drive compressors.

Regarding variable speed drive (VSD) models, these machines come in gear and direct drive. Since VSD air compressors generate different levels of pressure to meet various demands, they're more complex than fixed speed machines.

Direct drive VSD air compressors are the most advanced models we offer. They're powered by frequent inverter regulation (IVR). For minimal friction, there's a direct drive IVR air compressor with an interior permanent magnet (iPM) motor. With IVR technology, energy is reduced by up to 35%.

If you need a simple solution with consistent air pressure all day long, a fixed speed model might be right for you. However, if you work across multiple projects, and don't need your machine on all day, it's worth considering a variable speed drive model.

Of course, cost is a major factor when choosing any air compressor. It's worth noting that whether choosing belt drive, gear drive, or direct drive, you'll receive the best possible equipment.

Oil-free vs. oil-injected

You might come across information discussing the benefits of oil-free and oil-injected air compressors. The biggest difference between the two is whether or not it's important to have traces of oil in your air. However, in most cases, a filter can minimize this factor.

Our range of rotary screw compressors are oil-injected, meaning the internal engines require lubrication for cooling. This type of machine typically runs for a long time, and produces minimal ambient heat and noise. When running this equipment, you'll want to follow environmental guidelines for disposing of oil.

You'll mostly find oil-free machines in non-industrial settings, including medical practices or DIY applications. They tend to not be suitable for heavy-duty use.

The right rotary screw compressor solution

Throughout this article, we've touched upon the different options you'll encounter when purchasing a new rotary screw air compressor. We hope this information is useful when making a new investment.

As always, our team is here to help guide you through the process. You might find it particularly helpful to speak with our industry experts if you're replacing or adding equipment. Regardless of your compressed air set up, we're available to create the right solution for you.

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What air compressor do I need?

If you’re still not sure what type of air compressor you need, feel free to get in touch with our experts for personal advice. We’ll assess your situation and help you find the perfect compressor.

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