Who needs a rotary screw air compressors anyway?
Rotary screw air compressors are perfect for:
- Large and small production facilities (factories)
- Bigger garages and workshops
- People that need lot’s of compressed air
But… I have seen a lot of business that bought a rotary screw compressor, where a reciprocating compressor would have been better (they listened to the salesman who sold them the biggest machine they could).
If any of the following applies to you, a rotary screw compressor is not for you:
- You only need compressed air for hand tools
- You don’t need air continuously
- You need a compressor for home/diy type of work
- You need a compressor for light construction work (to power nailers, etc).
In these cases, a reciprocating air compressor would be a better choice.
How to choose the right capacity and pressure for your new rotary screw air compressor.
It is very important to buy a compressor that can supply you with enough amounts of compressed air, at the right pressure. Unfortunately, most people don’t know exactly what they need, and end up buying a too big or a too small air compressor.
Let me help you.
If you buy a rotary screw compressor, it is usually for one of the following reasons:
- This is your first air compressor.
- It’s a replacement for an old rotary screw compressor
- You now have a reciprocating compressor, but need more capacity (cfm).
- You already have a rotary screw compressor, but need more capacity.
A VSD compressor is NOT a good choice when: It runs at 90-100% speed all the time. In fact, a VSD that runs at full speed consumes more energy than a standard fixed-speed compressor
The compressors only runs at 10-20% all the time. In fact, the compressor is way too big, but I have seen this so many times! It would be more energy efficient to get a smaller fiexed speed compressor. Furthermore, compressors that run only at low speeds will experience a lot (a lot!) of maintenance issues.
A VSD compressor is a good choice when it runs at 50 – 80% load. This is where the money-saving is. Plus it allows the compressor to heat up, which will prevent lot’s of maintenance issues.