Oil-Free Screw Compressor Airpol BSPR75 — 605 m³/h, 8 bar, VFD, Moldova

What Is the Airpol BSPR75

The Airpol BSPR75 is an industrial two-stage oil-free screw compressor with variable-speed drive (VFD), produced by Przedsiębiorstwo Produkcji Sprężarek Airpol Sp. z o.o. (Poznań, Poland). It belongs to the BS PR series — Airpol’s top-tier oil-free compressor line with frequency drive.

Model designation breakdown:

• BS — (Bezmasłowy Śrubowy) — oil-free screw
• PR — (Przemiennik Częstotliwości) — with variable frequency drive (VFD)
• 75 — rated motor power 75 kW

Operating principle: two-stage air compression on two pairs of stainless steel screw rotors without oil in the compression chamber. An intercooler with a cyclone condensate separator (automatic drain) is installed between stages. Drive: direct, via gearbox, from a Hoyer IE3/IE4 motor controlled by a Delta VFD900C43A C2000+ series frequency inverter.

Key design feature: the compression chamber is optimally isolated from the gearbox. Oil from the gearbox does not physically enter the air path — not just separated out — which is a fundamental difference from lubricated compressors with oil separators. Rotors and the block housing are coated with a PFAS-free coating (no per- and polyfluoroalkyl substances) — corrosion protection when working with humid air. Control: Siemens SIMATIC controller with web server (Modbus TCP), remote monitoring via browser.

Airpol BSPR75 Technical Specifications

💡 Expert Tip: The 274 m³/h figure is the minimum output at 50% VFD speed. Do not design the pneumatic system for a calculated flow below this value: when demand drops below 274 m³/h, the compressor will still produce a minimum of 274 m³/h, causing overpressure and frequent safety valve actuation. Minimum consumer flow should be no less than 250–260 m³/h.

Airpol BSPR75 Alternatives by Brand

⚠️ Warning: Models without the “two-stage” designation are single-stage oil-free compressors. At 8 bar pressure, a single-stage block operates at higher compression temperatures, accelerating rotor coating wear. For 8–10 bar pressure in 24/7 operation, the two-stage architecture of the BSPR75 is technically superior.

5 parameters to compare when evaluating alternatives:

• Number of compression stages (two-stage preferred at ≥8 bar)
• Air quality class per ISO 8573-1 (Class 0 or Class 1 for oil)
• VFD regulation range (BSPR75: 50–100% — competitive value)
• Block bearing life (BSPR75: more than 80,000 hours)
• Rotor coating: PFAS-free coating is important for pharmaceutical and food production

Application Areas for the Airpol BSPR75

Pharmaceutical Production

• Compressed air for tablet pressing, encapsulation, blister packaging — direct product contact
• Pneumatic conveying of powdered active pharmaceutical ingredients (API) without oil contamination risk
• Blowing and drying ampoules, vials, syringes prior to filling
• Control of pneumatic valves in CIP/SIP systems — GMP Annex 1 compliance

Food and Beverage Industry

• Pneumatic conveying of bulk ingredients (flour, sugar, starch) without oil residue
• Blowing containers (PET bottles, cans) before filling on high-speed lines
• Modified atmosphere packaging (MAP) — air as a component of the gas mixture
• Pneumatic actuators in direct product contact zones (HACCP zones)

Electronics and Microelectronics

• Cleaning boards and components with compressed air free of oil film
• Pneumatic manipulators and robots in ISO 5–7 cleanrooms
• Leak testing of electronic device enclosures

Chemical and Petrochemical Industry

• Pneumatic actuators for valves and regulators at hazardous facilities
• Purging reactors and pipelines with inert atmosphere (together with nitrogen generator)
• Laboratory compressed air for analytical instruments (chromatographs, spectrometers)

Oil-Free VFD Compressor Selection Algorithm for Production

Processing time: 20–30 minutes with air consumption data available.

1. Step 1 — Determine the required air purity class. Set classes per ISO 8573-1 for three parameters: particles, water, oil. For direct product contact (pharmaceuticals, food) — Class 1 for oil (≤0.01 mg/m³). This automatically means an oil-free compressor: no lubricated unit with separator and filters can guarantee Class 1 upon filter element failure.
2. Step 2 — Calculate total air consumption. Sum the rated flow of all pneumatic consumers. Apply a simultaneity factor of 0.70–0.85 (depending on the process). Add 10% margin for future expansion. Compare to BSPR75 range: 274–605 m³/h at 8 bar.
3. Step 3 — Evaluate the consumption profile. If consumption varies more than 30% during a shift — the VFD version (BSPR) pays back faster due to energy savings (~29%). If consumption is stable — consider the standard BS series without VFD at a lower entry price.
4. Step 4 — Check installation conditions. Footprint for the compressor: minimum 3.0 × 2.2 m + 1 m clearance on three sides for maintenance. Machine room ventilation: 11,700 m³/h forced air exchange. Room temperature: not exceeding +40 °C. Floor: 3,000 kg load over a 2.5 × 1.6 m base — verify load-bearing capacity.
5. Step 5 — Prepare electrical supply. Supply: 400 V / 3-phase / 50 Hz. Cable: 3×70 mm² + PE. Circuit breaker: 160 A. The VFD requires checking power grid quality: VFD is sensitive to phase imbalance over 2% and voltage outside ±10% of rated. Installation of a line reactor is recommended.
6. Step 6 — Request a quotation from Acvatron SRL. Provide the engineer with: calculated flow (m³/h), working pressure, room plan with dimensions and ceiling height, single-line electrical diagram. Receive a commercial offer with ROI calculation.

Why Acvatron SRL: 5 Strong Arguments

Engineering Selection for Your Process

An Acvatron engineer conducts a technical audit of compressed air consumption at your facility: analyzes the load profile, calculates the optimal size and pressure, compares BSPR75 with alternative solutions. The result is a justified choice, not just “a compressor of the right power.”

Complete Turnkey Project

Acvatron SRL supplies not only the compressor, but also related equipment: refrigerated or adsorption dryer, main-line filters per ISO 8573-1, receiver, piping system. One supplier — one responsibility for the entire compressed air preparation system.

Made-to-Order Supply with Guaranteed Delivery

The Airpol BSPR75 is supplied to order. The Acvatron engineer coordinates the exact delivery time with the Airpol factory and provides written confirmation. Shipment control and customs clearance are handled by Acvatron. The customer receives the compressor on schedule without surprises.

After-Sales Service Support

Acvatron provides commissioning and startup of the BSPR75 by certified specialists, training of customer staff to operate the Siemens SIMATIC controller, and scheduled maintenance per Airpol regulations (every 4,000 operating hours). Service hotline: +373 22 503-580.

Documentation for Legal Entities and Tenders

Full document package: invoice, delivery note, CE declaration of conformity, technical passport in Russian, ISO 8573-1 air certificate. Documents are prepared to pass tender procedures for enterprises with foreign participation and government organizations.

Expert Opinion

Vitaliy Boluchevskiy, Chief Engineer at Acvatron SRL, 15 years in the industry:

“The most costly mistake when choosing a compressor for pharmaceuticals or food production is buying a lubricated compressor with a set of filters under the guise of cost savings. An activated carbon adsorber element costs 300–500 euros, is replaced every 4,000 hours, and when it unexpectedly fails, all oil aerosol goes directly into the product. One product recall incident — and the price difference between an oil-lubricated and oil-free solution pays back tenfold. The Airpol BSPR75 eliminates this risk by design, not by filtration.”

Handling Objections

“An oil-free compressor is significantly more expensive — it’s not justified”

The initial cost of the BSPR75 is 30–40% higher than a lubricated equivalent. However, the total cost of ownership (TCO) over 5 years is lower for the oil-free solution: no oil costs (100–150 L/year × 5 years), no oil separator replacement (€1,800–2,500 / 4,000 h), no carbon filters. For pharmaceuticals: no risk of product recall due to oil contamination — one such incident costs more than three compressors.

“A lubricated compressor with good filters is sufficient for our production”

Filters work correctly only when changed on time and in good condition. An activated carbon adsorber loses 100% effectiveness upon failure or saturation — and this happens without visible signs. Regulatory authorities in pharmaceuticals (GMP Annex 1) and food (HACCP) require documented proof of oil absence — a filtration system cannot provide this. The oil-free BSPR75 can.

“We don’t know if 605 m³/h capacity suits our production”

Call +373 22 503-580 — an Acvatron engineer will perform an express calculation of compressed air needs based on your production equipment list. If flow data is not available — a site visit with measurement equipment can be arranged. Selection takes 1–2 business days.

Problems You May Have Already Encountered

• Oil trace in product: compressed air quality check revealed oil content exceedance — production stopped to replace filter elements and flush pneumatic lines.
• Customer complaint about product quality: oil contamination traces found on finished goods — batch recall, reputational and financial losses.
• GMP/HACCP audit revealed non-conformance: the air preparation system cannot provide a documented Class 1 per ISO 8573-1 — regulator order to rectify.
• Unstable pressure under variable load: a fixed-speed lubricated compressor runs idle 40–50% of the time — electricity wasted, pneumatic lines overheat from frequent pressure spikes.
• Unplanned shutdown due to oil separator clogging: production shift disrupted, replacement requires two-day wait for a spare part.

The only systemic solution eliminating oil contamination of compressed air at the design level — without dependence on filter replacement schedules — is an oil-free two-stage compressor of the Airpol BSPR75 class.

Frequently Asked Questions

❓ How does the Airpol BSPR75 differ from a lubricated screw compressor of the same power?

The Airpol BSPR75 is a two-stage oil-free compressor: the compression chamber is fully isolated from the gearbox, and oil has no contact with the compressed air. Outlet air quality meets Class 1 for oil aerosols per ISO 8573-1 (residual oil content less than 0.01 mg/m³). A lubricated compressor of the same power additionally requires oil separators, carbon filters, and an adsorption dryer to achieve comparable air quality, increasing both capital and operating costs. If a filter element fails in a lubricated compressor, the entire pneumatic system gets contaminated — the oil-free BSPR75 is immune to this risk by design.

❓ What is the real energy saving with the Airpol BSPR75 variable frequency drive?

The Delta VFD900C43A C2000+ series frequency inverter provides smooth capacity regulation in the range of 50–100%. With variable compressed air consumption (typical for food and pharmaceutical production), energy savings amount to approximately 29% compared to a compressor with conventional control. Over 8,000 h/year of operation at a rate of 3 lei/kWh at 75 kW, this is equivalent to 50,000–65,000 lei in annual savings. The C2000+ drive combined with an IE3/IE4 motor complies with the IES2 energy efficiency standard.

❓ What is the bearing life of the Airpol BSPR75 compressor block?

The bearings of the Airpol oil-free screw block are designed for a service life of more than 80,000 hours. Stainless steel rotors and the block housing are coated with PFAS-free coating — corrosion protection without per- and polyfluoroalkyl substances. With compliance to the maintenance schedule (every 4,000 operating hours: air filter replacement, cooling system check, condensate trap inspection) the block life is achieved without major overhauls.

❓ Does the Airpol BSPR75 comply with ISO 8573-1 requirements for pharmaceutical and food production?

Yes. The Airpol BSPR75 provides compressed air Class 1 for oil aerosols per ISO 8573-1 (residual oil ≤0.01 mg/m³). This is a mandatory requirement for direct air-to-product contact in pharmaceuticals (GMP Annex 1) and food industry (HACCP). The compressor introduces no oil contamination into the air flow by design, which is documented by the manufacturer’s certificate and does not depend on filter condition. CE Directives: 2014/68/EC, 2006/42/EC, 2014/30/EC, 2014/35/EC.