Choosing the wrong compressor type is expensive: too small and it cannot keep up with demand; wrong technology and you spend three times the running cost. Here is a plain-English comparison of the two main types for workshops, garages and factories in Northeast India.
Written by the counter team at Multi Trade Combines — 35 years supplying NE workshops.
Across Assam, Meghalaya and Manipur, power supply is uneven — voltage fluctuations are common, summer ambient temperatures push 38 °C in the Brahmaputra valley, and workshop spaces are often shared and dusty. These conditions punish the wrong compressor type. A rotary screw compressor installed in a dusty fabrication shed without proper intake filtration clogs oil separators in months. A small piston compressor asked to run continuously on a painting line burns out its motor windings in a season. Matching the type to the application protects your investment.
| Feature | Reciprocating (Piston) vs Rotary Screw |
|---|---|
| Working principle | Piston compresses air in cylinder | Counter-rotating screws trap & compress air |
| Duty cycle | 50–70 % (needs rest time) | 100 % continuous |
| Typical power range | 0.5 HP – 30 HP | 5 HP – 500 HP+ |
| CFM per HP (approx.) | 3–4 CFM/HP | 4–5 CFM/HP |
| Noise level | 75–90 dB(A) | 60–75 dB(A) (with enclosure) |
| Purchase cost | Lower | Higher (2–5×) |
| Running cost / hour | Higher (more heat, oil carryover) | Lower (efficient at full load) |
| Maintenance | Valves, rings, belts — workshop-serviceable | Oil separators, filters — specialist |
| Best for | Garages, workshops, intermittent use | Factories, painting lines, 24×7 use |
| Common brands at MTC | ELGi reciprocating range | ELGi screw range |
Always add 20–25 % buffer to the calculated FAD requirement.
| Application | Min. FAD → Suggested type |
|---|---|
| Single impact wrench / air gun | 10–15 CFM → Reciprocating 5–7.5 HP |
| Auto garage (3–4 tools simultaneous) | 40–60 CFM → Reciprocating 15–20 HP or 7.5 kW screw |
| Spray painting line (2 guns) | 30–50 CFM → 10–15 kW screw (oil-free preferred) |
| Pneumatic conveying / blasting | 100+ CFM → 22 kW+ screw |
| Tyre inflation point only | 5–8 CFM → Reciprocating 2–3 HP |
Piston compressors remain the workhorse of small Northeast workshops for good reason: they are cheaper to buy, easier to repair locally (any motor-winding or valve-seat workshop can service them), and power-tolerant — they can restart after a voltage dip that would damage a VFD-driven screw. Choose reciprocating when:
Screw compressors are the right answer for continuous-duty production environments. They are quieter (important in enclosed factory halls), more energy-efficient at full load, and produce cleaner air with proper oil separators. Choose a screw when:
Both reciprocating and screw types come in oil-lubricated and oil-free variants. Oil-free is mandatory for pharmaceutical, food-processing and electronics industries where compressed air contacts the product. For general workshops, oil-lubricated with a downstream coalescing filter is adequate and far more economical. In NE India's dusty hill-terrain factories, oil-free screw compressors carry a significant maintenance premium — factor this in.
We stock ELGi single- and two-stage reciprocating compressors from 1 HP to 30 HP and ELGi screw compressors for larger duty. Our team will calculate your FAD requirement, check your power supply specs and recommend the right tank size — call +91 91812 13332 or WhatsApp before you order.
For a car garage or auto-body shop running intermittent air tools, a reciprocating (piston) compressor is the cost-effective choice — lower purchase price, easy to service locally. For a production workshop that needs continuous compressed air (painting line, pneumatic conveying), a rotary screw compressor is better. Call +91 91812 13332 for a free sizing consultation.
A single spray gun requires 8–14 CFM at 40–60 PSI. A booth with two guns running simultaneously needs 20–30 CFM. Always add 25% buffer. A 15 HP reciprocating or 7.5 kW screw compressor typically covers a single-bay auto-painting operation.
Yes. Multi Trade Combines supplies ELGi reciprocating and screw air compressors from our Guwahati counter, with delivery across Assam and the Northeast. WhatsApp us at +91 76359 98826 for stock and delivery timelines.