توضیحات
LW-33/30 Nitrogen Compressor – High-Capacity Oil-Free N2 Booster for 3.00 MPa Ultra-High-Pressure Industrial Applications
Engineered to deliver 33 m³/min at 3.00 MPa discharge pressure, the LW-33/30 is a two-stage, three-row oil-free piston nitrogen compressor designed for ultra-high-pressure nitrogen injection, gas liquefaction systems, and demanding petrochemical process applications. Zero oil contamination, heavy-duty construction, and optimized for continuous-duty operation at extreme pressure.
Product Overview
The LW-33/30 nitrogen compressor represents a pinnacle achievement in our oil-free piston compressor portfolio, engineered for the most demanding ultra-high-pressure nitrogen applications in industrial gas infrastructure. With a substantial capacity of 33 m³/min and an exceptional 3.00 MPa discharge pressure, this unit occupies the ultra-high-pressure segment of our product range, serving applications that require nitrogen at pressures far exceeding conventional distribution levels.
What distinguishes the LW-33/30 is its fully oil-free compression pathway combined with the ability to deliver massive flow at extreme pressure. The piston rings and rider bands are precision-machined from advanced self-lubricating PTFE composite materials that operate without any hydrocarbon lubricants, ensuring the nitrogen stream remains completely free of oil contamination. At 3.00 MPa, even trace oil contamination would be highly concentrated and extremely difficult to remove downstream, making the native oil-free design not merely advantageous but absolutely mandatory for high-purity applications.
The compressor architecture employs a two-stage, three-row (二列三级) configuration that is essential for managing the extreme pressure ratio required to achieve 3.00 MPa discharge pressure. The three-row arrangement provides superior force balance and reduced vibration compared to single-row designs, while the two-stage compression ensures thermodynamic efficiency and manageable discharge temperatures. Each stage features independent intercooling, preserving the integrity of the PTFE sealing elements even under the thermal stress of ultra-high-pressure operation. The reinforced cast-iron frame and heavy-duty forged steel crankshaft are rated for a minimum service life of 120,000 hours under standard maintenance protocols.
Technical Specifications – LW-33/30
| Parameter | Value | Unit |
|---|---|---|
| مدل | LW-33/30 | – |
| الگو | Two-stage, Three-row (二列三级) | – |
| ظرفیت | 33 | متر مکعب در دقیقه |
| فشار تخلیه | 3.00 | مگاپاسکال |
| Compressor Size (L × W × H) | 3160 × 1685 × 2440 | mm |
| وزن | 6.60 | t |
| قدرت | 350 | کیلووات |
| ولتاژ | ۶ هزار یا ۱۰ هزار | V |
| گاز متوسط | Nitrogen (N₂) | – |
| Lubrication | بدون روغن | – |
* 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. Ultra-High-Pressure Oil-Free PTFE Sealing System
The LW-33/30 employs a proprietary self-lubricating piston ring and rider band assembly manufactured from ultra-high-performance PTFE composites reinforced with glass fiber, carbon fiber, and bronze particulates. This advanced material formulation achieves a coefficient of friction below 0.05 without any external hydrocarbon lubrication, ensuring the nitrogen stream remains completely free of oil contamination even at 3.00 MPa discharge pressure. At this extreme pressure, the partial pressure of any oil vapor would be approximately 10 times higher than at 0.30 MPa, making downstream oil removal practically impossible. The PTFE formulation is rated for continuous operation at temperatures up to 190°C, ensuring reliable sealing integrity under the severe thermal stress of ultra-high-pressure compression.
2. Three-Row Force Balance for Extreme Pressure Stability
The three-row opposed-cylinder arrangement of the LW-33/30 provides exceptional first-order and second-order force cancellation, reducing the unbalanced inertia forces transmitted to the foundation by over 90% compared to single-row designs. At 3.00 MPa discharge pressure, the peak gas forces on the pistons are substantially higher than in conventional compressors, making force balance a critical design consideration. The three-row configuration distributes these forces across multiple cylinders, minimizing vibration transmission and allowing the compressor to operate on a standard reinforced concrete inertia block without requiring specialized vibration isolation systems. This mechanical stability is essential for continuous-duty operation in 24/7 industrial environments.
3. Two-Stage Compression with Enhanced Intercooling
The two-stage compression architecture is thermodynamically essential for achieving the 3.00 MPa discharge pressure target. The overall pressure ratio of approximately 30:1 to 60:1 (depending on inlet conditions) is divided between a low-pressure stage and a high-pressure stage, with each stage operating at a manageable pressure ratio. A high-capacity shell-and-tube intercooler between stages removes the substantial heat of compression, maintaining discharge temperatures below 160°C and preventing thermal degradation of the PTFE sealing elements. The intercooler is oversized relative to the compressor capacity to ensure adequate cooling margin even during summer ambient conditions or marginal cooling water temperatures.
4. Medium-Voltage Drive for High-Power Industrial Integration
The LW-33/30 is driven by a 350 kW medium-voltage induction motor available in either 6kV or 10kV configurations, conforming to IEC 60034-1 efficiency class IE3. The medium-voltage drive is essential for a motor of this power rating, eliminating the need for oversized low-voltage switchgear and heavy-gauge cabling that would be required for a 380V equivalent. Direct integration into industrial medium-voltage distribution networks reduces electrical infrastructure costs, minimizes I²R losses in power cabling, and improves overall energy efficiency. The motor is equipped with a robust bearing system rated for the radial and axial loads associated with high-pressure compressor operation.
Application Scenarios
Ultra-High-Pressure Nitrogen Injection for Oil & Gas
In oil and gas production operations, the LW-33/30 provides high-pressure nitrogen for enhanced oil recovery (EOR), gas lift operations, and well stimulation. The 3.00 MPa discharge pressure is sufficient for injecting nitrogen into reservoirs at depths up to 2,000 meters, where formation pressures require high injection pressures to achieve effective displacement. The 33 m³/min capacity can serve multiple injection wells simultaneously through a centralized high-pressure nitrogen distribution system. The oil-free design is critical in oilfield applications because any oil contamination would alter the wettability of reservoir rock, reducing oil recovery efficiency and potentially causing formation damage.
Large-Scale Gas Liquefaction Booster Systems
In nitrogen liquefaction plants and cryogenic gas processing facilities, the LW-33/30 nitrogen booster compresses nitrogen from the liquefier vaporizer or storage system to the high pressure required for distribution, further processing, or reinjection into the liquefaction cycle. The 3.00 MPa discharge pressure is sufficient for driving nitrogen through high-pressure heat exchangers, expansion turbines, and process equipment that operates at elevated pressures. The oil-free design prevents contamination of the cryogenic equipment, where even trace oil would freeze and block heat exchanger passages, causing catastrophic process upsets.
Petrochemical Ultra-High-Pressure Process Nitrogen
In petrochemical and refinery operations, the LW-33/30 provides ultra-high-pressure nitrogen for high-pressure reactor inerting, catalyst regeneration, emergency depressurization, and pipeline pressure testing. The 3.00 MPa discharge pressure is sufficient to inject nitrogen into process vessels operating at pressures up to 2.5 MPa, maintaining positive inert gas blankets during all operational phases. 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.
Power Generation & Turbine Inerting
Gas-fired power plants and combined cycle facilities require high-pressure nitrogen for gas turbine rotor inerting, combustion chamber purging, and HRSG (heat recovery steam generator) preservation during shutdown periods. The LW-33/30’s 3.00 MPa discharge pressure is adequate for driving nitrogen through the complex internal passages of large gas turbines and for maintaining positive pressure in HRSG tube bundles during extended outages. The high flow capacity can serve multiple turbines within a single power generation complex, reducing the number of compressor units required and simplifying maintenance logistics.
Material & Construction
The LW-33/30 is constructed from premium materials selected for ultra-high-pressure nitrogen compatibility, extreme thermal resistance, and extended operational life:
| Component | Material | Specification |
|---|---|---|
| Cylinder Block (LP) | Gray Cast Iron | GG25 / HT250, reinforced wall thickness |
| Cylinder Block (HP) | Gray Cast Iron | GG25 / HT250, heavy-duty reinforced + ribbing |
| Crankshaft | Forged Alloy Steel | 42CrMo4, Q&T, ISO 1940 G2.5 dynamically balanced |
| Piston Rings | PTFE-Glass-Carbon-Bronze Composite | Ultra-high-pressure rated, self-lubricating, 190°C max |
| Rider Bands | PTFE Composite | Piston guidance, anti-scuffing, wear rate <0.03 mm/1000h |
| Valve Plates | Stainless Steel | SS316, ultra-high-pressure concentric ring design |
| Connecting Rods | Forged Steel with Babbitt Bearings | Heavy-duty, precision-machined, oil-lubricated |
| Intercooler | Carbon Steel Shell / SS316 Tubes | ASME VIII Div.1, oversized capacity, 1.5× hydrotest |
| 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 |
| Base Frame | Heavy-Duty Structural Steel | Welded fabrication, vibration-damped mounting |
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 LW-33/30 has a dry weight of 6.60 tonnes and a center of gravity approximately 950 mm above the baseplate. The three-row opposed-cylinder design provides exceptional force balance, permitting installation on a reinforced concrete inertia block of 12–15 tonnes. The block should be mounted on elastomeric vibration isolators (natural frequency 6–8 Hz). Minimum clearance requirements: 1.5 m on the non-drive side for valve access, 1.2 m on the drive side for motor maintenance, and 2.0 m overhead for crane access during major overhauls. The high-pressure discharge piping must be properly supported with spring hangers and anchored to prevent vibration-induced fatigue at 3.00 MPa. All piping supports must be designed to accommodate thermal expansion during startup and shutdown cycles.
Cooling Water System Design
Cooling water demand is approximately 40 m³/h at an inlet temperature not exceeding 32°C. The water distribution circuit supplies the cylinder jackets, intercooler, and aftercooler in parallel branches with individual flow control valves. Given the extreme pressure ratio, the intercooler is oversized relative to compressor capacity to ensure adequate cooling margin. 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 closed-loop cooling tower with side-stream filtration and chemical treatment is strongly recommended for all installations to ensure consistent cooling water quality.
Preventive Maintenance Schedule
| Interval | Service Item | Action Required |
|---|---|---|
| Daily | Operational Inspection | Check vibration levels, abnormal noise, cooling water flow, discharge pressure, temperature |
| 250 hours | Valve Plate Inspection | Remove and inspect suction/discharge valves for carbon deposits, spring fatigue, cracking |
| 1,000 hours | Piston Ring Wear Assessment | 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 |
| 6,000 hours | Major Overhaul | Inspect crankshaft journals, measure main bearing clearances, replace bearings if >0.08 mm |
The oil-free design of the LW-33/30 dramatically simplifies maintenance compared to lubricated alternatives. There are no oil changes, no oil analysis, no filter replacements, and no separator cartridge changes. 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 at ultra-high pressure. The high-pressure valve plates may require more frequent inspection than low-pressure equivalents due to the extreme mechanical stress at 3.00 MPa, but the overall maintenance burden remains significantly lower than oil-lubricated systems.
Compliance & Safety Certifications
The LW-33/30 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 rapid gas release and oxygen displacement is extremely elevated. All LW-33/30 installations must incorporate continuous oxygen deficiency monitoring in the compressor room and all adjacent areas. High-pressure discharge piping must be equipped with pressure relief valves rated at 110% of MAWP and rupture discs as secondary protection. All high-pressure piping must be designed, fabricated, and inspected in accordance with ASME B31.3 (Process Piping). Ventilation systems must maintain ambient oxygen above 19.5% per OSHA 29 CFR 1910.146. Emergency shutdown interlocks should activate at 19.5% O₂ (alarm) and trigger automatic isolation at 18.0% O₂ (hard shutdown). Personnel must be trained in ultra-high-pressure gas safety protocols before operating or maintaining this equipment. High-pressure nitrogen systems must be clearly labeled and physically separated from low-pressure areas.
Performance & Efficiency Analysis
The LW-33/30 achieves a specific power consumption of approximately 10.61 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, where the work required increases substantially with pressure ratio. Within the ultra-high-pressure oil-free piston compressor segment (discharge pressure >2.50 MPa), this efficiency is highly competitive and significantly superior to diaphragm compressors, which are the primary alternative for oil-free ultra-high-pressure service. For comparison, oil-lubricated reciprocating compressors in similar ultra-high-pressure applications typically consume 11.5–13.0 kW/m³/min, while diaphragm compressors may exceed 18 kW/m³/min.
Over a standard 8,000-hour annual operating schedule, the LW-33/30’s efficiency advantage versus less efficient alternatives yields approximately 200,000–400,000 kWh of annual energy savings. At $0.08/kWh, this represents $16,000–$32,000 in direct electricity cost reduction per year. However, the primary economic justification for the LW-33/30 is typically the elimination of oil-related consumables and the avoidance of downstream oil-removal equipment that would be mandatory with lubricated alternatives. At 3.00 MPa, the energy penalty of downstream oil-filtration systems (coalescing filters, activated carbon adsorbers, oil monitoring instrumentation) would consume 5–8% of the compressor’s power output—an additional 28–56 kW of parasitic load that the LW-33/30’s oil-free design eliminates entirely.
The total cost of ownership for ultra-high-pressure nitrogen compression is reduced by an estimated 25–35% over a 10-year operational life when the oil-free LW-33/30 is compared to lubricated systems with full downstream purification. This TCO advantage is driven by lower energy consumption, elimination of oil consumables, reduced maintenance labor, and higher equipment availability.
Customization & OEM Capabilities
We offer extensive customization options to adapt the LW-33/30 to specific site conditions, integration requirements, and end-user specifications:
- Skid-Mounted Turnkey Packages: Pre-assembled compressor, motor, intercooler, aftercooler, high-pressure discharge piping, instrumentation, and control panel on a structural steel skid with integrated lifting lugs and anchor bolt templates. Factory pre-testing of all systems reduces commissioning risks and field installation time by 60%.
- Hazardous Area Configurations: ATEX Zone 2 and IECEx compliant motor and electrical enclosures for petrochemical installations. Integrated gas detection, automatic ventilation interlocks, and explosion-proof instrumentation can be incorporated into the control system.
- Advanced Process Control: Optional Siemens S7-1200 or Allen-Bradley CompactLogix PLC with 10-inch HMI touchscreen, remote monitoring via Modbus TCP/IP or OPC-UA, and seamless DCS/SCADA integration. Ultra-high-pressure safety interlocks including automatic unload on overpressure, emergency isolation valves, and redundant pressure transmitters.
- Environmental Protection: C5-M marine-grade coating systems for coastal or offshore installations; tropicalized electrical components for ambient temperatures up to 55°C; and IP54-rated acoustic enclosures reducing noise emission from 88 dB(A) to 74 dB(A) at 1 meter.
- OEM & Private Label: Custom paint colors, branded nameplates, and localized documentation packages for gas equipment distributors and system integrators. Technical manuals, spare parts lists, and maintenance procedures can be supplied in multiple languages.
Custom configurations are available from MOQ 1 unit. Engineering review and proposal generation typically require 5–7 business days. Standard delivery time is 14–16 weeks; repeat orders are delivered in 10–12 weeks from order confirmation.
Case Study: Gas Liquefaction Plant Nitrogen Booster Upgrade
Client: A cryogenic gas processing facility in the Middle East producing liquid nitrogen for industrial and medical markets
Challenge: The facility’s existing oil-lubricated nitrogen booster (American brand, 20 years in service) was experiencing progressive oil carryover into the high-pressure nitrogen stream feeding the liquefaction cycle. Oil contamination was freezing in the main heat exchanger, causing blockages that required monthly shutdowns for defrosting and cleaning. Each unplanned shutdown cost $45,000 in lost production, and the maintenance team was spending 30% of their time on oil-related issues. The facility needed a reliable oil-free replacement capable of delivering 30+ m³/min at 3.00 MPa.
Solution: We supplied an LW-33/30 oil-free nitrogen compressor as a direct replacement, configured on a custom skid with integrated intercooler, aftercooler, and a Siemens S7-1200 PLC control panel with full SCADA integration. The skid footprint was engineered to match the existing foundation, eliminating civil modifications. The three-row design provided superior vibration characteristics compared to the replaced single-row compressor, reducing foundation stress. A 5 m³ surge vessel was installed upstream to buffer pressure fluctuations from the upstream nitrogen generator.
Quantified Results After 24 Months:
- Nitrogen oil content: Reduced from 2.8 mg/m³ to <0.01 mg/m³, achieving ISO 8573-1 Class 0
- Heat exchanger blockages: Eliminated completely, with zero defrosting shutdowns required
- Unplanned downtime: Reduced from 12 days/year to 0 days, saving $540,000 in lost production
- Maintenance labor: Reduced by 35% as oil-related maintenance was eliminated
- Energy consumption: Improved by 8.2% versus the replaced unit, saving $28,000/year
- Payback period: 1.4 years based on downtime reduction and maintenance savings alone
“The LW-33/30 has transformed our liquefaction plant reliability. Before, we were fighting oil contamination every month. Now, we haven’t touched the heat exchanger in two years. The oil-free design has paid for itself many times over in avoided downtime alone.” — Operations Director, Cryogenic Gas Processing Facility
FAQ & Selection Guide
Related Products & Solutions
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ZW Series Multi-Stage Oil-Free Compressors
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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 Upgrade Your Ultra-High-Pressure Nitrogen System?
Our application engineers are standing by to evaluate your nitrogen flow requirements, suction conditions, discharge pressure targets, and integration constraints. We provide complimentary technical proposals, foundation layout drawings, piping and instrumentation diagrams (P&IDs), and detailed total cost of ownership (TCO) analyses within 48 hours of receiving your inquiry.
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