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Rotary Screw Air Compressor — Industrial Compressed Air Solutions
Heavy-duty rotary screw air compressors designed for production, petro-chemical, mining and construction applications. Oil flooded and oil free configurations from 5 to 500 HP with variable speed drive options that save 15-35% on energy costs over fixed-speed models.
5–500 HP
Power Range
18–2,200 CFM
Airflow Capacity
100–175 PSI
Discharge Pressure
62–76 dBA
Noise Level
100%
Duty Cycle
15–35%
Energy Savings vs Piston
Compressed Air Challenges in Industrial Operations — How Rotary Screw Technology Solves Them
Any plant that runs pneumatic tools, automated manufacture lines or process instrumentation needs a dependable source of compressed air. When that compressed air system goes down-troop, or your aging piston compressor turns on and off 40 times an hour-troop, your bottom line feels the pinch directly: production halts, your product suffers and your utility costs spike. Just one hour of lost time at a car assembly plant costs the auto industry 7,968.00 and conventional compressor use represents 20-30% of total facility electricity consumption. (U.S. Department of Energy).
Rotary screw air compressor systems are different. Their rounded, Moebius co-axial design creates a pulsation-free flow of incoming air, halving or more piston compressor pressure ripple. Industrial rotary screw air compressor can manage 100% duty cycle operation- your plant air compressors run as long as your plant- with no time off or thermal shut down. PanGeng custom builds our rotary screw air compressor systems with 60,000+ hour twinscrew plant air end and integrated oil removal systems that keep oil carry-over into the compressed air at 3ppm or less. For industrial factory use, we design our oil-sealed screw compressor and oil free systems to reach a Hapasog Hapasog-1 Class 0 air quality standard.
Engineering Note — Compression Principle
Air enters via the intake filter and gets trapped in between the male and female rotors. Its volume decreases as the intertwistinglobes spin, compressing the intake air from atmospheric pressure to discharge pressure before the discharge valve opens. During operation, oil is injected to the synchronous screw compress orthogonal pressure of the equipotential surface, mitigate lobe to wear, absorbs compression gas’ heating factors, maintain the discharging temperature below 200F, lubricate the spray bearings and apart several hundreds of hours, the compression oil separator separates the lubrication oil from the air with residual oil content of 2-3 ppm before reaching to the receiver and refrigeration for water removal.
A few bit hitEfficiencyoptimization is part of the package. Our rotary screw compressor offers typical full-load CFM values of approximately 4.0-4.5 available per horsepower while a piston compressor only delivers 3.0-3.8 CFM per HP. VSD technology works by adjusting the electric motor speed to match real-time air demand, rather than cycling between idling and fully off, resulting in an additional part load efficiency gains of approximately 15-30%.
PanGeng Rotary Screw Air Compressor Series — Models and Selection
We offer rotary screw compressors in four power levels- each with fixed speed and variable speed drive options. All units include built-in control panel, integrated lubrication oil removal system, aftercooler and an air cooled or water cooled heat exchanger as required to the environment. If you insist on high-end industrial air purity classification of 9apasasup-1 Class 0 of our oil free rotary screw compressor, you may select a design to that standard.
Compact Series — 5–15 HP
- Airflow18–65 CFM
- Pressure100–150 PSI
- Noise62–66 dBA
- Weight350–650 kg
- DriveFixed / VSD
- Best ForSmall shops, garages, labs
Industrial Series — 20–50 HP
- Airflow80–220 CFM
- Pressure100–175 PSI
- Noise66–72 dBA
- Weight700–1,400 kg
- DriveFixed / VSD
- Best ForManufacturing, food & beverage
High-Output Series — 75–200 HP
- Airflow320–950 CFM
- Pressure100–175 PSI
- Noise72–76 dBA
- Weight1,800–4,200 kg
- DriveFixed / VSD
- Best ForHeavy industrial, petrochemical
Heavy-Duty Series — 250–500 HP
- Airflow1,100–2,200 CFM
- Pressure100–150 PSI
- Noise74–78 dBA
- Weight4,500–8,000 kg
- DriveVSD standard
- Best ForMining, large-scale plants
Decision Matrix — Match Your Application to the Right Model
| Application | Typical Air Demand | Recommended HP | Pressure (PSI) | Configuration |
|---|---|---|---|---|
| Auto body shop / Small workshop | 25–50 CFM | 7.5–15 HP | 100–125 PSI | Fixed-speed, tank-mounted |
| CNC machining / Metal fabrication | 60–150 CFM | 20–40 HP | 125–150 PSI | VSD recommended |
| Food & beverage processing | 80–200 CFM | 25–50 HP | 100–125 PSI | Oil-free required |
| General manufacturing plant | 150–400 CFM | 40–100 HP | 100–150 PSI | VSD + refrigerated dryer |
| Petrochemical / Mining | 400–1,500 CFM | 100–400 HP | 125–175 PSI | Multi-unit with central controller |
| Large-scale industrial complex | 1,500+ CFM | 2×250–500 HP | 100–150 PSI | Redundant VSD systems |
Procurement Note
When geqinguaar recommendations, include your peak online flow demand, average daily hours of plant operation, ambient temperature ranges, and required air purity class. Variable speed drive units have a 15-25% purchase price premium that can be recuperated over 12-24 months through energy savings in fluctuating demand loading applications such as batch manufacturing. We offer free evaluations of total pneumatic demand using VSD or standard equipment on projects that exceed 30 HP.
Transitioning from a fixed-speed compressor to a variable speed drive system alters the consumption of electricity for your operation—and that energy impact is exactly what influences the overall cost of ownership considerations, as we examine in the next section.
Rotary Screw vs Piston Air Compressor — Data-Driven Performance Comparison
Purchase departments and engineers assessing compressor upgrades require hard numbers rather than marketing speak. As interim we have compiled the following comparison table for rotary screw and piston compressor performance against the key purchasing criteria. For simplicity we have reported typical values for 30 HP class units as this is the majority of industrial compressed air supplied.
| Performance Metric | Rotary Screw (30 HP) | Piston / Reciprocating (30 HP) | Advantage |
|---|---|---|---|
| Duty Cycle | 100% continuous | 60–75% (requires cooling rest) | Rotary screw |
| Airflow Output | 120–135 CFM | 90–110 CFM | Rotary screw (+22%) |
| Energy Efficiency (kW per 100 CFM) | 18–20 kW | 22–26 kW | Rotary screw (–23%) |
| Noise Level | 66–72 dBA | 82–95 dBA | Rotary screw (–16 dBA) |
| Oil Carryover (oil-flooded) | 2–3 ppm | 10–15 ppm | Rotary screw (cleaner air) |
| Maintenance Interval | Every 2,000–4,000 hrs | Every 500–1,000 hrs | Rotary screw (4× longer) |
| Service Life (airend/pump) | 60,000–100,000 hrs | 15,000–30,000 hrs | Rotary screw (3–4×) |
| Floor Space Required | 1.2–1.8 m² | 1.5–2.5 m² | Rotary screw (–25%) |
| Vibration | Minimal (balanced rotors) | Significant (reciprocating mass) | Rotary screw |
| Upfront Cost (typical) | $14,000–$22,000 | $6,000–$12,000 | Piston (lower initial) |
| Annual Energy Cost (8,000 hrs) | ~$11,500 | ~$15,000 | Rotary screw (–$3,500/yr) |
| 5-Year TCO (purchase+energy+maintenance) | ~$82,000 | ~$98,000 | Rotary screw (–$16,000) |
Initial cost differences narrow within 2-3 years (after considering the savings in both energy use and reduced maintenance expenditure that the rotary screw design provides). In real life, over 80% of existing sites switching from piston to rotary screw compressors get a return on their investment in less than 2.5 years and then go on to benefit fromthe cost savings for their compressor for the next 15 years or more.20hour+ use per day compressors make a very significantdifference to total cost of ownership.
Engineering Note — Why the Energy Gap Exists
There are two types of energy losses in piston compressors that will not occur in a rotary screw compressor. When the piston is accelerating to change direction at the end of a stroke, so it can begin compressing, inertial energy losses take place. Power is used to accelerate and decelerate the piston mass rather than in compressing air. Piston units use 25-40% of their full-load power during unload conditions because they fire in load/unload cycles. A variable speed drive rotary screw compressor would not have any losses to inertial forces and a VSD is capable of reducing motor speed to match demand, cutting power consumption in proportion to the reduced air flow.
Client Results — Energy Savings and ROI with Rotary Screw Upgrades
Transition from dated reciprocating compressor to new generation rotary screw compressor results in quantifiable savings in energy, maintenance and production availability. Three cases below are indicators of typical gains achieved through PanGeng units in various industries.
CNC Machine Shop Cuts Energy Bill After Piston-to-Screw Upgrade
A mid scale fabriation plant in Jiangsu Province replaced two existing 20 HP piston compressors (collectively 15years old) with a single PanGeng 40 HP VSD rotar screw. The pistons had a 70% duty cycle with thermal trips during summer when the ambient temperature was greater than 35 C.
28% Energy Reduction
Estimated yearly electrical savings of 85,000 ($11,700 USD). Maintenance interventions were reduced from quarterly to a yearly change of oil and filters. Our variable speed drive unit monitors real air demand for the shop under a varying production schedule and runs at 45-80% speed rather than full-load cycling.
“We used to lose 2–3 production days per summer to compressor overheating. The screw unit has run through two summers without a single unplanned stop.” — Plant Operations Manager
Instrument Air Reliability Upgraded for Chemical Plant
Since the petrochemical plant needed instrument air for control valve operators and pneumatic instrumentation, ISO 8573-1 Class 1.2.1 was used. Previously installed was a two-stage oilfogged screw compressor 75 HP with external air treatment that could not hold dew point specifications amid the monsoon season (humidity exceeded 85%).
99.7% Uptime Achieved
t consisted of a Pack Geng air compressor which provided 100 HP, oil free rotary screw air compressor and a combined refrigerated air dryer and particulate filtration rated to ISO 8573-1 Class 0.1.1. Switching to oil free equipment eliminated the need for activated carbon filters, leading to lower operating costs. No alarms for instrument air quality during the first 14 months of operation.
“Instrument air quality is not negotiable in our process. The oil-free unit gave us the consistency we needed without the complexity of external oil removal systems.” — Utilities Engineer
Diesel-Driven Portable Screw Compressor for Remote Drilling
A mining contractor operating in three provinces required steady compressed air for pneumatic rock drills and sand blasting gear at sites with no grid power. The owner’s previous diesel piston units required re-building after each 3000 hour completion run, and gave variable pressure for sustained, high altitude (2800m) operation.
4,500+ Hours Between Major Service
PanGeng’sdiesel-engine portable rotary screw air compressorof 24 m/ min at 8 MPa discharge pressure produced a constant flowrate at altitude with automatic altitude adjustment. Screw airend service intervals increased by 50%, allowing prolonged campaign conduct operations across the remote glove.
“At 2,800 meters, the old pistons lost 15–20% output. The screw unit holds its rated CFM without us adjusting anything.” — Site Operations Supervisor
Certifications and Compliance Standards
All PanGeng rotary screw air compressors are produced at our Bengbu factory by qualified and licensed personnel according to best quality system certified management scheme. All air compressors are tested to keep up to the requirements of pressure equipment and efficiency based on international standards.
CE
Pressure Equipment Directive 2014/68/EU
ISO 9001:2015
Quality Management System
ISO 14001:2015
Environmental Management
ISO 1217
Compressor Acceptance Testing
ISO 8573-1
Compressed Air Quality Classes
ASME
Pressure Vessel Standards (Air Receivers)
All oil free models are Class 0 certified under ISO 8573-1 for use in food and beverage, pharmaceutical and electronics manufacturing where air cleanliness is a regulatory requirement. All air receivers are designed and tested in accordance with section VIII, Division 1 of the ASME boiler and pressure vessel code. Test certificates and material traceability data are included with each unit shipped.
Buying Guide — Pricing, Lead Times, and After-Sales Support
Rotary screw air compressors are built on a project by project basis, with builds tailored to your compressed air requirements. Below are typical lead times, pricing considerations and support conditions.
Pricing Factors
Prices for rotary screw air compressor based on HP, drive types (fixed-speed or VSD), lubrication types (oil flooded or oil free), air treatment packs (refrigerated air dryer, compressed air dryers, filtration), tank mount options (with or without air receiver), voltage / phase types (single phase available for units under 15 HP, 3 ph for industrial models). We can offer itemized quotations on your air requirements within 48 hours of your request.
Lead Times
Standard models (5-100 HP oil-flooded, fixed-speed): 4-6 weeks from time of order confirmation. VSD and oil-free models: 6-8 weeks. Custom high pressure or specialty gas models: 8-12 weeks. Rush production can be arranged for missions critical packages. Please speak to our sales engineering team about lead time.
Warranty and After-Sales
Currently all Pan Geng rotary screw compressor come with a 2-year standard warranty on the airend, the motor and the controller. We also offer extended warranty packages (3 or 5 years). Our after sales program can offer remote diagnostics support, recommended spare part kits for 8,000 hours and 16,000 hours service and field service technician deployment for commissioning and major service. We keep a stock of spare part on all current model and can supply parts for discontinued model within 15 years of last production.
Procurement Advisory
As much as possible of the following should be prepared PRIOR to requesting a quotation: total connected pneumatic load (CFM), desired discharge pressure (PSI), uptime per day, ambient temperature range, elevation above sea level, electrical supply available (volts/phases/hertz), air quality requirements (ISO 8573-1 class), integrated air treatment needed (dryer, filters, condensate management). This information in advance will eliminate any revision cycles and help speed a quote along.
Engineering Tools & Calculators
Utilize our data-driven sizing and evaluation tools to determine the precise compressed air configuration and ROI metrics for your industrial facility.
Compressor Sizing Calculator
Input your facility’s pneumatic tools, CFM demand, and operating conditions to determine the exact horsepower, tier, and drive type required for your operations.
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Energy Savings Estimator
Compare your current piston or fixed-speed compressor against our VSD rotary screw technology to calculate your estimated annual energy savings and investment payback period.
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Ready to Upgrade Your Compressed Air System?
In order to get the most value out of your compressor investment determine your ESTIMATED AIR DEMAND (CFM) and the following before requesting a quotation: operating conditions, budgetary constraints. Why important: gives the supplier a rough starting point for quoting the right sized machine allows the packager to a calculate approximate running costs of the machine for your facility.
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