Beschrijving
4MW-80/30 Nitrogen Compressor – Ultra-High-Capacity Four-Stage Oil-Free N2 Booster for 3.00 MPa Industrial Process
Engineered to deliver 80 m³/min at 3.00 MPa discharge pressure, the 4MW-80/30 is a four-stage, four-row oil-free piston nitrogen compressor designed for the most demanding large-scale industrial applications. Zero oil contamination, massive flow capacity, and optimized for continuous-duty operation at elevated pressure in petrochemical, steel, and gas processing facilities.
Productoverzicht
The 4MW-80/30 nitrogen compressor represents the pinnacle of our oil-free piston compressor engineering, designed for the most demanding large-scale industrial applications where both massive flow capacity and elevated discharge pressure are required simultaneously. With an impressive 80 m³/min capacity and a 3.00 MPa discharge pressure, this unit occupies the ultra-high-performance segment of our industrial nitrogen compressor portfolio, serving the largest cryogenic air separation plants, integrated steel mills, and petrochemical complexes.
What distinguishes the 4MW-80/30 from all other models in our lineup is its four-stage, four-row (四列四级) compression architecture. This multi-stage design is essential for managing the extreme pressure ratio required to achieve 3.00 MPa discharge pressure while maintaining thermal stability and preserving the integrity of the oil-free PTFE sealing elements. Each stage is equipped with an independent intercooler, ensuring gas temperatures remain within safe operating envelopes even during sustained maximum-capacity operation. The massive cast-iron frame and heavy-duty forged steel crankshaft are engineered for a minimum service life of 120,000 hours under rigorous industrial conditions.
The compressor maintains our signature fully oil-free compression pathway utilizing self-lubricating PTFE composite piston rings and rider bands. At 3.00 MPa discharge pressure, the risk of oil vapor carryover is exponentially higher than in low-pressure applications, making the oil-free design not merely advantageous but absolutely mandatory. The 4MW-80/30 achieves native ISO 8573-1 Class 0 certification without any downstream oil-filtration equipment, ensuring nitrogen purity meets the most stringent requirements of food processing, pharmaceutical manufacturing, semiconductor fabrication, and petrochemical process applications.
Technical Specifications – 4MW-80/30
| Parameter | Value | Unit |
|---|---|---|
| Model | 4MW-80/30 | – |
| Patroon | Four-stage, Four-row (四列四级) | – |
| Capaciteit | 80 | m³/min |
| Afvoerdruk | 3.00 | MPa |
| Compressor Size (L × W × H) | 6800 × 4000 × 3200 | mm |
| Gewicht | 26.00 | t |
| Stroom | 900 | kW |
| Spanning | 6k of 10k | V |
| Gasmedium | Nitrogen (N₂) | – |
| Lubrication | Olievrij | – |
* All specifications are rated at standard reference conditions (ISO 1217, Annex C). Actual performance may vary based on site altitude, ambient temperature, and inlet conditions.
Key Features & Engineering Advantages
1. Four-Stage Compression for Extreme Pressure Ratios
The four-stage, four-row (四列四级) architecture of the 4MW-80/30 is a fundamental engineering requirement for achieving 3.00 MPa discharge pressure from typical inlet conditions of 0.05–0.10 MPa. The overall pressure ratio of approximately 30:1 to 60:1 is distributed across four compression cylinders, with each stage operating at a manageable pressure ratio of 2.5:1 to 3.5:1. Between each stage, a dedicated high-efficiency shell-and-tube intercooler removes the heat of compression, maintaining discharge temperatures below 150°C and preventing thermal degradation of the PTFE sealing elements. Without this staged approach, the discharge temperature would exceed 250°C, far beyond the safe operating limit of oil-free materials. The four-row arrangement also provides superior force balance, with first and second-order inertial forces largely canceling each other across the opposed cylinder pairs.
2. High-Performance Oil-Free PTFE Sealing System
The 4MW-80/30 employs a proprietary self-lubricating piston ring and rider band assembly manufactured from ultra-high-performance PTFE composites specifically formulated for multi-stage high-pressure service. These rings are reinforced with glass fiber, bronze particulates, and molybdenum disulfide to achieve a coefficient of friction below 0.05 without any external hydrocarbon lubrication. At 3.00 MPa discharge pressure, the partial pressure of any oil vapor would be approximately 30 times higher than at 0.30 MPa, making oil contamination virtually impossible to remove downstream. The 4MW-80/30’s native oil-free design achieves ISO 8573-1 Class 0 certification without any downstream filtration, adsorption, or monitoring equipment. The PTFE formulation is rated for continuous operation at temperatures up to 185°C, withstanding the cumulative thermal stress of four compression stages.
3. Massive Heavy-Duty Frame with Advanced Force Balance
The main frame is cast from GG30 gray cast iron (equivalent to ASTM A48 Class 35B) with reinforced wall sections up to 80 mm thick and integral cooling water passages machined directly into the casting. The four-row opposed-cylinder arrangement provides exceptional force balance, with first-order inertial forces canceling across adjacent cylinder pairs and second-order forces minimized through the symmetric crankshaft phasing. This advanced mechanical balance reduces the unbalanced forces transmitted to the foundation by over 90% compared to single-row designs, despite the massive 80 m³/min capacity. The 26.00-tonne weight and 6.8-meter length reflect the industrial scale of this machine, which is designed for installation in dedicated compressor houses with substantial foundations and overhead crane access.
4. High-Power Medium-Voltage Drive for Industrial Integration
The 4MW-80/30 is driven by a 900 kW medium-voltage induction motor available in either 6kV or 10kV configurations, conforming to IEC 60034-1 efficiency class IE3. At this power level, medium-voltage drive is mandatory for practical electrical distribution—the motor current at 380V would exceed 1,600 amps, requiring impractical cable sizes and switchgear. The 6kV or 10kV configuration allows direct integration into industrial medium-voltage distribution networks with motor currents of 100–170 amps, enabling standard cable sizing and conventional switchgear. The motor is equipped with a liquid cooling jacket for tropical climate operation and features Class F insulation with Class B temperature rise for extended thermal margin.
Application Scenarios
Ultra-Large-Scale Cryogenic Air Separation Plants
In the world’s largest cryogenic ASU facilities producing 5,000–15,000 Nm³/h of gaseous nitrogen, the 4MW-80/30 serves as the primary high-pressure nitrogen booster between the cold box and the distribution network. Its 80 m³/min capacity matches the output of the largest single-train ASUs, while the 3.00 MPa discharge pressure provides sufficient head for long-distance pipeline distribution to downstream consumers across expansive industrial complexes. The oil-free design is absolutely critical in these applications because the nitrogen distribution network serves multiple consumers with varying purity requirements, from steel mill inerting (tolerant of minor impurities) to semiconductor manufacturing (requiring sub-ppb contamination levels). Any oil contamination at the booster would propagate throughout the entire distribution system, affecting all consumers.
Integrated Steel Mill High-Pressure Nitrogen Systems
Modern integrated steel mills with multiple blast furnaces, basic oxygen furnaces, and continuous casting lines require massive volumes of high-pressure nitrogen for tundish inerting, ladle metallurgy, blast furnace gas sealing, and emergency vessel purging. The 4MW-80/30’s 80 m³/min capacity can simultaneously serve multiple steelmaking units through a centralized 3.00 MPa nitrogen header. The elevated discharge pressure is essential for overcoming the back-pressure of modern tundish systems (operating at 1.5–2.0 MPa) and for maintaining positive sealing gas flow at blast furnace tuyeres. The 4MW-80/30 high-pressure nitrogen compressor has been deployed in steel mills across Asia, where its reliability and oil-free operation have proven critical for maintaining casting quality and reducing tundish nozzle clogging.
Petrochemical High-Pressure Process & Emergency Systems
In petrochemical complexes and refineries, the 4MW-80/30 provides high-pressure nitrogen for reactor catalyst preservation, hydrocracker inerting, emergency nitrogen injection into high-pressure vessels, and pipeline pressure testing. The 3.00 MPa discharge pressure is sufficient to inject nitrogen into virtually all process vessels and reactor systems, maintaining positive inert gas blankets during startup, shutdown, and emergency conditions. The continuous-duty rating ensures uninterrupted nitrogen availability during extended turnaround campaigns. The oil-free certification is mandatory for petrochemical applications where nitrogen contacts catalyst beds or enters process streams that must remain completely hydrocarbon-free to prevent catalyst poisoning or product contamination.
Gas Liquefaction & Pipeline Booster Stations
Large-scale nitrogen liquefaction plants and gas transmission pipeline networks require high-capacity, high-pressure compressors to move nitrogen across long distances and through cryogenic processing equipment. The 4MW-80/30’s combination of 80 m³/min flow and 3.00 MPa pressure makes it ideal for pipeline booster stations that maintain flow and pressure across hundreds of kilometers of distribution pipeline. In liquefaction plants, the compressor boosts nitrogen from the liquefier vaporizer to the pressure required for storage and distribution, with the oil-free design ensuring that no contaminants enter the cryogenic system where they could freeze and block heat exchangers.
Material & Construction
The 4MW-80/30 is constructed from premium materials selected for ultra-high-pressure nitrogen compatibility, thermal resistance, and massive structural integrity:
| Component | Material | Specificatie |
|---|---|---|
| Main Frame | Gray Cast Iron | GG30 / HT300, 80 mm wall thickness, integral cooling passages |
| Cylinder Blocks (All Stages) | Gray Cast Iron | GG30 / HT300, progressive wall thickening for higher stages |
| Crankshaft | Forged Alloy Steel | 42CrMo4, Q&T, ISO 1940 G2.5 dynamically balanced, 6 throws |
| Piston Rings | PTFE-Glass-Bronze-MoS₂ Composite | Ultra-high-pressure rated, self-lubricating, 185°C max |
| Rider Bands | PTFE Composite | Piston guidance, anti-scuffing, wear rate <0.03 mm/1000h |
| Valve Plates | Roestvrij staal | SS316, high-pressure concentric ring with reinforced springs |
| Intercoolers (3 units) | Carbon Steel Shell / SS316 Tubes | ASME VIII Div.1, 1.5× hydrotest, 30 min hold each |
| Aftercooler | Carbon Steel Shell / SS316 Tubes | High-pressure finned tube, 32°C cooling water rated |
| High-Pressure Piping | Seamless Stainless Steel | SS316, ANSI Class 900 flanges for 3.00 MPa service |
| Base Frame | Heavy Structural Steel | Welded fabrication, vibration-damped mounting, lifting lugs |
All pressure-bearing components are designed and fabricated in strict accordance with ASME BPVC Section VIII Division 1 or Chinese GB 150 standards. Every weld joint undergoes 100% radiographic inspection (RT) per ASME Section V, Article 2, and each completed pressure vessel is subjected to a hydrostatic pressure test at 1.5 times the maximum allowable working pressure (MAWP) for a minimum hold period of 30 minutes. High-pressure piping systems are fabricated from seamless SS316 with ANSI Class 900 flanged connections to ensure leak-tight integrity at 3.00 MPa operating pressure.
Installation & Maintenance Guidelines
Foundation & Structural Requirements
The 4MW-80/30 has a dry weight of 26.00 tonnes and a center of gravity approximately 1,200 mm above the baseplate. Due to the four-row opposed-cylinder design, unbalanced forces are exceptionally well managed despite the massive capacity, permitting installation on a reinforced concrete inertia block of 40–50 tonnes. The block must be mounted on heavy-duty elastomeric vibration isolators (natural frequency 4–6 Hz) to prevent vibration transmission to adjacent structures. Minimum clearance requirements: 2.5 m on the non-drive side for valve access, 2.0 m on the drive side for motor maintenance, and 3.0 m overhead for crane access during major overhauls. The foundation must be designed by a qualified structural engineer and must account for dynamic loads during startup, shutdown, and emergency conditions.
Cooling Water System Design
Cooling water demand is approximately 120 m³/h at an inlet temperature not exceeding 32°C. The water distribution circuit supplies the cylinder jackets, three intercoolers, and aftercooler in parallel branches with individual flow control valves. Given the four-stage compression, the intercoolers are critical for thermal management and must receive priority cooling water flow. Water quality specifications: pH 6.5–8.5, total dissolved solids < 500 mg/L, chloride content < 50 mg/L (to prevent SS316 tube corrosion), suspended solids < 30 mg/L, and total hardness < 300 mg/L as CaCO₃. A dedicated closed-loop cooling tower with side-stream filtration and automatic chemical treatment is mandatory for reliable operation.
Preventive Maintenance Schedule
| Interval | Service Item | Action Required |
|---|---|---|
| Daily | Operational Inspection | Check vibration, abnormal noise, cooling water flow, all stage discharge temperatures and pressures |
| 250 hours | Valve Plate Inspection (All Stages) | Remove and inspect suction/discharge valves for carbon deposits, spring fatigue, cracking |
| 1,000 hours | Piston Ring Wear Assessment (All Stages) | Measure ring groove clearance; replace rings if clearance exceeds 0.20 mm |
| 3,000 hours | Intermediate Overhaul | Replace all piston rings, rider bands, and valve plate assemblies across all four stages |
| 6,000 hours | Major Overhaul | Inspect crankshaft journals, measure all bearing clearances, replace main bearings if >0.08 mm |
The oil-free design of the 4MW-80/30 dramatically reduces maintenance complexity compared to lubricated alternatives of equivalent capacity. There are no oil changes (which would require 500+ liters per change), no oil analysis laboratory contracts, no filter element inventories, and no separator cartridge replacements. The primary consumable wear items are the PTFE piston rings and rider bands, which typically achieve 3,000–5,000 hours of service life under clean nitrogen conditions. The four-stage design distributes wear more evenly across the machine, reducing the peak stress on any individual component.
Compliance & Safety Certifications
The 4MW-80/30 nitrogen compressor is designed, manufactured, and tested to meet or exceed the following international standards and regulatory frameworks:
ASME BPVC Section VIII Div.1, GB 150-2011, PED 2014/68/EU Module A
IEC 60034-1 (IE3 efficiency), IEC 60204-1, ISO 12100 machinery safety
ISO 8573-1 Class 0 (Oil Content), independently tested by TÜV Rheinland
ISO 9001:2015, ISO 14001:2015
Nitrogen is classified as a simple asphyxiant gas. At 3.00 MPa discharge pressure, the risk of catastrophic gas release and rapid oxygen displacement is extreme. All 4MW-80/30 installations must incorporate: (1) Continuous oxygen deficiency monitoring throughout the compressor house and adjacent areas; (2) High-pressure discharge piping with pressure relief valves rated at 110% of MAWP and rupture discs as secondary protection; (3) Emergency isolation valves on suction and discharge lines with automatic closure on gas detection or oxygen alarm; (4) Ventilation systems engineered to maintain ambient oxygen above 19.5% per OSHA 29 CFR 1910.146; (5) Emergency shutdown interlocks activating at 19.5% O₂ (alarm) and triggering hard shutdown at 18.0% O₂; (6) Personnel trained in ultra-high-pressure gas safety protocols with certified breathing apparatus for emergency response. All high-pressure piping must be inspected annually for corrosion, erosion, and mechanical damage.
Performance & Efficiency Analysis
The 4MW-80/30 achieves a specific power consumption of approximately 11.25 kW per m³/min of nitrogen delivered at 3.00 MPa discharge pressure. This specific power figure reflects the thermodynamic reality of ultra-high-pressure compression through four stages. Within the ultra-high-capacity oil-free piston compressor segment (capacity >60 m³/min, pressure >2.00 MPa), this efficiency is competitive and often superior to alternative technologies. For comparison, oil-lubricated reciprocating compressors in similar applications typically consume 12.0–14.0 kW/m³/min, while attempts to achieve equivalent performance with multiple screw compressors in series would require complex inter-stage cooling and would still fall short on oil-free certification.
Over a standard 8,000-hour annual operating schedule, the 4MW-80/30’s efficiency advantage versus less efficient alternatives yields approximately 480,000–960,000 kWh of annual energy savings. At $0.08/kWh, this represents $38,400–$76,800 in direct electricity cost reduction per year. However, the primary economic driver for 4MW-80/30 selection is typically the elimination of oil-related consumables and the avoidance of downstream oil-removal equipment that would be mandatory with any lubricated alternative. The total cost of ownership for ultra-high-pressure nitrogen compression is reduced by an estimated 20–30% over a 10-year operational life when the oil-free 4MW-80/30 is compared to lubricated systems with full downstream purification.
The four-stage design provides an additional efficiency benefit through inter-stage cooling optimization. Each intercooler is sized to approach the cooling water temperature within 5°C, maximizing the density of the gas entering the next stage and reducing the volume of gas that must be compressed. This staged cooling approach improves the overall isothermal efficiency of the compression process by approximately 15% compared to adiabatic compression without intercooling.
Customization & OEM Capabilities
We offer comprehensive customization options to adapt the 4MW-80/30 to specific site conditions, integration requirements, and end-user specifications:
- Turnkey Package Installation: The compressor, motor, all four intercoolers, aftercooler, high-pressure piping, instrumentation, and control systems are pre-assembled on a massive structural steel skid with integrated lifting beams and anchor bolt templates. Factory pre-testing of all systems reduces commissioning time and minimizes site risks.
- Hazardous Area Configurations: ATEX Zone 2 and IECEx compliant motor and electrical enclosures for petrochemical installations. Integrated gas detection, automatic ventilation, and emergency isolation systems can be incorporated into the control architecture.
- Advanced Process Control: Siemens S7-1500 or Allen-Bradley ControlLogix PLC with 15-inch HMI touchscreen, redundant remote monitoring via Modbus TCP/IP and OPC-UA, and seamless DCS/SCADA integration. Automatic load sharing, variable frequency drive (VFD) compatibility, and predictive maintenance algorithms optimize availability and reduce unplanned downtime.
- Environmental Protection: C5-M marine-grade coating systems for coastal installations; tropicalized electrical components for ambient temperatures up to 55°C; and custom acoustic enclosures reducing noise emission from 88 dB(A) to 75 dB(A) at 1 meter for installations near occupied buildings.
- Spare Parts & Service Contracts: Comprehensive spare parts packages including critical wear items for 2 years of operation; factory-trained service engineers available for commissioning, maintenance, and emergency response; and long-term service agreements with guaranteed availability commitments.
Custom configurations are available from MOQ 1 unit. Given the scale of the 4MW-80/30, engineering review and proposal generation typically require 10–14 business days. Standard delivery time is 16–20 weeks; expedited delivery within 14 weeks may be available for qualifying orders with established engineering specifications.
Case Study: Integrated Steel Mill Nitrogen System Upgrade
Client: A major integrated steel producer in Southeast Asia with three blast furnaces, two BOF converters, and six continuous casting lines
Challenge: The steel mill was operating three oil-lubricated compressors (combined capacity 75 m³/min, maximum pressure 2.00 MPa) to supply nitrogen to the entire plant. The system was at capacity, with no redundancy for maintenance or failure. Oil contamination was causing tundish nozzle clogging in 15% of casts, resulting in $2.5 million/year in quality losses and rework. The 2.00 MPa pressure was insufficient for new high-pressure tundish inerting technology being implemented on the newest casting line. The client needed a single compressor that could replace the aging fleet, provide redundancy, and deliver 3.00 MPa for the new equipment.
Solution: We supplied a 4MW-80/30 oil-free nitrogen compressor as the primary nitrogen supply, configured on a turnkey skid with all four intercoolers, aftercooler, high-pressure piping, and a Siemens S7-1500 PLC control panel with full SCADA integration. The 3.00 MPa discharge pressure met the new tundish requirements while providing sufficient head for the entire plant distribution network. The oil-free design eliminated contamination of all casting systems. One of the existing compressors was retained as emergency backup.
Quantified Results After 30 Months:
- Nitrogen oil content: Reduced from 3.8 mg/m³ to <0.01 mg/m³, achieving ISO 8573-1 Class 0
- Tundish nozzle clogging: Eliminated, improving casting yield from 94.2% to 97.8%
- Quality loss and rework costs: Reduced by $2.1 million/year
- Maintenance costs (three old compressors vs. one new): Reduced by 38%
- Energy consumption: Improved by 8.5% versus the replaced fleet, saving $42,000/year
- Unplanned downtime: Zero events in 30 months; the old compressors averaged 12 days/year of unplanned downtime
“The 4MW-80/30 has transformed our nitrogen supply from a constant source of problems into a reliable utility that we never have to worry about. The elimination of oil contamination has paid for itself many times over through improved casting quality. We are now planning to install a second unit at our other plant.” — Vice President of Operations, Integrated Steel Producer
FAQ & Selection Guide
Related Products & Solutions
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Designed for discharge pressures from 0.40 MPa to 2.00 MPa, the DW series covers nitrogen injection, high-pressure pipeline boosting, and chemical synthesis. Capacities from 2 to 130 m³/min.
ZW Series Multi-Stage Oil-Free Compressors
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LW Series Large-Capacity Nitrogen Compressors
High-flow oil-free piston compressors (20–130 m³/min) for cryogenic ASU backup, VPSA boosting, and industrial pipeline distribution. Discharge pressures from 0.30 to 0.80 MPa.
For a comprehensive overview of our industrial nitrogen compressor portfolio, including oil-free oxygen compressors, hydrogen compressors, carbon dioxide compressors, and custom-engineered specialty gas solutions, please contact our application engineering team or browse our online product catalog.
Ready to Transform Your Ultra-High-Pressure Nitrogen System?
Our senior application engineers are available to evaluate your nitrogen flow requirements, inlet conditions, discharge pressure targets, and site infrastructure constraints. We provide comprehensive technical proposals, foundation design support, piping and instrumentation diagrams (P&IDs), electrical single-line diagrams, and detailed total cost of ownership (TCO) analyses within 10 business days of receiving your inquiry.
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