Choosing the right screw air compressor prevents wasted energy, undersized air supply and early breakdowns. The correct machine depends on your required flow, working pressure, duty cycle and air quality. This guide walks through the decisions that matter before you buy a rotary screw compressor.
Step 1: Calculate Required Flow and Pressure
- Add the CFM or m³/min demand of every pneumatic tool and process.
- Add a 20–30% margin for leaks and future expansion.
- Confirm the highest working pressure your equipment needs, usually 7–13 bar.
Step 2: Match the Machine Type
- Fixed-speed machines suit constant full-load operation.
- Variable-speed machines save energy when demand fluctuates.
- Oil-free models are required for food, medical and electronics air.
Step 3: Evaluate Total Cost of Ownership
- Compare purchase price, energy use, maintenance and spare parts.
- Energy typically accounts for 70% of lifecycle cost.
- Check warranty, local service support and lead time.
How do I know what air flow I need?
Add up the consumption of all tools running at the same time, then add a safety margin. Our engineers can help size the compressor from your equipment list.
Talk to an Engineer
Contact Panrui with your flow, pressure and air quality requirements to get a recommendation and factory quote for your project.