Compressed air acts as factory’s universal power source; improper compressor selection causes high power waste, frequent breakdown and product disqualification. We summarize industry-oriented screw compressor selection rules for your reference.

1.Classify by Air Purity: Oil-Injected VS Oil-Free Screw

- Oil-free screw compressor (Class 0 clean air): Mandatory for Food&Beverage, Pharmaceutical, Semiconductor, Medical device. Strict hygiene standard prohibits oil residue from contaminating finished goods .

- Oil-injected screw compressor: Cost-effective option for machinery, auto parts, textile, woodworking, plastic molding; equip with dryers & precision filters to reach standard air quality.

2.Select Control Mode: Fixed Speed / VSD Variable Speed

- Fixed-speed: Fit factories with steady full-load air consumption, lower initial investment.

- VSD inverter screw: Best choice for workshops with fluctuating air usage (textile, injection molding). Automatically adjust airflow per real-time demand, cut electricity cost greatly.

3.Industry Matching Details

Automotive & Metal Processing: Continuous 24h operation, gear-driven high-efficiency screw, matched with refrigerated dryer system

Chemical Industry: IP55 protection grade, optional anti-corrosion & explosion-proof design; water-cooled model for high-temperature workshop

PET Bottle Blowing: High-pressure oil-free screw to satisfy bottle forming process

Construction/Quarry: Mobile diesel screw compressor, no fixed power needed for field work

Core Selection Formula

Required CFM = Total air consumption of all equipment × simultaneous usage rate + 20% spare margin for future capacity expansion; add pipeline pressure loss when setting working pressure.

With 10+ years industrial compressor experience, we provide one-stop compressed air system solution including compressor, dryer, filter & air tank. Drop your industry & air parameters for free technical proposal.