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LW-30/8 Nitrogen Compressor – High-Flow Oil-Free N2 Booster for Medium-Pressure Pipeline Distribution
Delivering 30 m³/min at 0.80 MPa discharge pressure, the LW-30/8 is a two-stage, two-row oil-free piston nitrogen compressor engineered for medium-scale cryogenic air separation, VPSA nitrogen booster stations, and industrial pipeline networks requiring elevated pressure head. Zero lubricant contamination, continuous-duty rated, and built for 24/7 operational reliability.
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The LW-30/8 nitrogen compressor occupies a strategically important position in our oil-free piston compressor lineup, bridging medium-flow nitrogen generation with elevated-pressure distribution requirements. With a rated capacity of 30 m³/min and a discharge pressure of 0.80 MPa, this unit serves as the backbone of medium-scale cryogenic air separation plants, industrial VPSA booster installations, and nitrogen pipeline networks where higher pressure head is required to overcome distribution friction losses.
What sets the LW-30/8 apart from conventional lubricated compressors is its fully oil-free compression pathway. The piston rings and rider bands are precision-manufactured from self-lubricating PTFE composite materials that operate without hydrocarbon lubricants, ensuring the nitrogen stream remains entirely free of oil contamination. This intrinsic oil-free characteristic is indispensable for applications mandating ISO 8573-1 Class 0 certification, including food packaging nitrogen, pharmaceutical reactor inerting, electronics-grade process gas, and chemical synthesis feedstock.
The compressor architecture adheres to a two-stage, two-row (二列二级) configuration that partitions the total pressure ratio across two compression cylinders. This staged approach reduces the discharge temperature per stage, enhances volumetric efficiency, and prolongs the operational life of valves and sealing elements. Each compression stage is equipped with an independent intercooler, maintaining gas temperatures within thermally safe operating envelopes even during sustained maximum-load operation. The robust cast-iron frame and dynamically balanced forged steel crankshaft are rated for a minimum service life of 120,000 hours under standard preventive maintenance protocols.
Technical Specifications – LW-30/8
| Parameter | Value | Unit |
|---|---|---|
| نموذج | LW-30/8 | – |
| نمط | Two-stage, Two-row (二列二级) | – |
| سعة | 30 | م³/دقيقة |
| ضغط التفريغ | 0.80 | ميجا باسكال |
| Compressor Size (L × W × H) | 2890 × 1600 × 2173 | mm |
| وزن | 4.12 | t |
| قوة | 200 | كيلوواط |
| الجهد االكهربى | 380 / 6k or 10k | V |
| وسط غازي | Nitrogen (N₂) | – |
| Lubrication | خالٍ من الزيوت | – |
* 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. Oil-Free PTFE Composite Sealing System
The LW-30/8 employs a proprietary self-lubricating piston ring and rider band assembly manufactured from high-density PTFE composites reinforced with glass fiber and bronze particulates. This material formulation achieves a dynamic coefficient of friction below 0.08 without any external hydrocarbon lubrication, completely eliminating the risk of oil vapor carryover into the nitrogen product stream. For operators in regulated industries, this translates directly to ISO 8573-1 Class 0 compliance without the capital investment, operating costs, and maintenance burden of downstream oil-filtration trains.
2. Two-Stage Thermodynamic Optimization with Intercooling
The two-stage compression architecture of the LW-30/8 is thermodynamically optimized for the 0.80 MPa discharge pressure target. By distributing the pressure ratio between a low-pressure cylinder and a high-pressure cylinder, the compressor achieves a lower mean effective temperature per stage. A dedicated shell-and-tube intercooler between stages removes the heat of compression, maintaining discharge temperatures below 155°C even at maximum continuous load. This thermal management strategy extends valve plate service life by approximately 35% compared to single-stage compressors operating at equivalent overall pressure ratios, and it prevents thermal degradation of the PTFE sealing elements that could otherwise occur at elevated temperatures.
3. Heavy-Duty Cast-Iron Frame with Inherent Force Balance
The main compressor block is cast from GG25 gray cast iron (equivalent to ASTM A48 Class 30B) with integral cooling water passages machined into the cylinder barrels. The two-row opposed-cylinder arrangement provides natural first-order force cancellation, reducing the unbalanced inertia forces transmitted to the foundation by over 80% compared to single-row designs of equivalent capacity. This mechanical advantage permits the LW-30/8 to operate on a relatively modest foundation block (minimum 7 tonnes versus 12+ tonnes for single-row equivalents), reducing civil engineering costs and simplifying retrofit installations within existing compressor houses or machinery rooms.
4. Flexible Voltage Configuration for Industrial Integration
The 200 kW drive motor is available in 380V, 6kV, or 10kV configurations, allowing seamless integration into diverse industrial electrical distribution architectures. The standard 380V option is ideal for facilities with existing low-voltage infrastructure, while the 6kV and 10kV variants eliminate the need for step-down transformers in large-scale air separation plants where medium-voltage bus systems are standard. This voltage flexibility reduces electrical infrastructure costs, improves overall energy efficiency by minimizing transformer losses, and simplifies the commissioning process.
Application Scenarios
Medium-Scale Cryogenic Air Separation Plants
In cryogenic ASU facilities producing 600–1,500 Nm³/h of gaseous nitrogen, the LW-30/8 serves as the primary nitrogen booster between the cold box and the medium-pressure distribution header. Its 30 m³/min capacity aligns precisely with the output of medium-scale ASUs, while the 0.80 MPa discharge pressure provides sufficient head for pipeline distribution over distances up to 3 km to downstream consumers such as steel mill inerting stations, chemical reactor blanketing systems, and LNG plant purge gas networks. The oil-free design is particularly critical in ASU service because any hydrocarbon contamination would degrade the cryogenic separation efficiency and potentially damage downstream molecular sieve dryers.
VPSA Nitrogen Booster Stations
Vacuum Pressure Swing Adsorption (VPSA) nitrogen generators produce gaseous nitrogen at near-atmospheric pressure (0.05–0.10 MPa). The LW-30/8 nitrogen booster compresses this low-pressure product to 0.80 MPa for distribution to point-of-use applications. The oil-free compression path is absolutely essential in VPSA service because any hydrocarbon contamination would poison the carbon molecular sieve adsorbent, permanently degrading the nitrogen generator’s separation efficiency and necessitating costly adsorbent replacement. The 0.80 MPa discharge pressure is particularly advantageous for VPSA installations serving multiple consumers through a branched distribution network where pressure losses are significant.
Petrochemical & Refinery Pipeline Nitrogen Injection
Refinery tank farms, petrochemical storage facilities, and process plants require large volumes of nitrogen for tank blanketing, inerting, and pipeline purging to prevent explosive vapor formation and maintain product quality. The LW-30/8’s 0.80 MPa discharge pressure provides ample head to overcome pipeline friction losses over distances up to 3 km, making it suitable for centralized nitrogen supply to multiple storage tanks, process vessels, and flare systems through a single distribution header. The continuous-duty rating ensures uninterrupted nitrogen availability during extended turnaround maintenance campaigns that may span several weeks.
Food Processing & Modified Atmosphere Packaging
Large-scale food packaging facilities and processing plants require high-flow nitrogen for modified atmosphere packaging (MAP), controlled atmosphere storage, and inert gas flushing of processing equipment. The LW-30/8’s 30 m³/min capacity can simultaneously supply multiple high-speed packaging lines, industrial ovens, and storage silos, while its oil-free certification ensures compliance with FDA 21 CFR 173.310 (food-grade nitrogen) and EU Regulation 231/2012. The absence of oil contamination eliminates the risk of off-flavors, rancidity, or product discoloration that can occur when lubricated compressors are used in food-contact applications, protecting brand reputation and avoiding costly product recalls.
Material & Construction
Every component of the LW-30/8 is selected for nitrogen compatibility, corrosion resistance, and long-term mechanical integrity under continuous-duty operation:
| Component | مادة | Specification |
|---|---|---|
| Cylinder Block | Gray Cast Iron | GG25 / HT250, integral water jackets |
| Crankshaft | Forged Alloy Steel | 42CrMo4, Q&T, ISO 1940 G2.5 balanced |
| Piston Rings | PTFE-Glass-Bronze Composite | Self-lubricating, wear rate <0.05 mm/1000h |
| Rider Bands | PTFE Composite | Piston guidance, prevent cylinder wall contact |
| Valve Plates | Stainless Steel | SS316, concentric ring spring-loaded design |
| Connecting Rods | Forged Steel with Babbitt Bearings | Precision-machined, oil-lubricated big end |
| Intercooler | Carbon Steel Shell / SS304 Tubes | ASME VIII Div.1, 1.5× hydrostatic test |
| Aftercooler | Carbon Steel Shell / SS304 Tubes | Finned tube design, 32°C cooling water inlet |
All pressure-bearing components are designed and fabricated in 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 time of 30 minutes before release from the factory.
Installation & Maintenance Guidelines
Foundation Requirements
The LW-30/8 has a dry weight of 4.12 tonnes and a center of gravity approximately 820 mm above the baseplate. Thanks to the two-row opposed-cylinder design, the unbalanced forces are minimal, allowing installation on a reinforced concrete inertia block of 7–9 tonnes. The block should be mounted on elastomeric vibration isolators (natural frequency 6–8 Hz) to prevent vibration transmission to adjacent structures and instrumentation. Minimum clearance requirements: 1.5 m on the non-drive side for valve access and maintenance, 1.2 m on the drive side for motor service, and 2.0 m overhead for crane access during major overhauls.
Cooling Water System
The LW-30/8 requires approximately 28 m³/h of cooling water at an inlet temperature not exceeding 32°C. The cooling water distribution circuit supplies the cylinder jackets, intercooler, and aftercooler in parallel. Water quality specifications: pH 6.5–8.5, total dissolved solids < 500 mg/L, chloride content < 50 mg/L (to prevent SS304 tube corrosion in the coolers), suspended solids < 30 mg/L, and total hardness < 300 mg/L as CaCO₃. For sites with marginal water quality or high ambient temperatures, a closed-loop cooling tower with side-stream filtration and chemical treatment is strongly recommended to prevent scale formation and corrosion.
Preventive Maintenance Schedule
| Interval | Service Item | Action Required |
|---|---|---|
| Daily | Operational Inspection | Check vibration levels, abnormal noise, cooling water flow, discharge temperature |
| 250 hours | Valve Plate Inspection | Remove and inspect suction/discharge valve plates for carbon deposits or cracking |
| 1,000 hours | Piston Ring Wear Assessment | Measure ring groove clearance; replace rings if clearance exceeds 0.25 mm |
| 4,000 hours | Intermediate Overhaul | Replace all piston rings, rider bands, and valve plate assemblies |
| 8,000 hours | Major Overhaul | Inspect crankshaft journals, measure bearing clearances, replace main bearings if >0.08 mm |
The oil-free design of the LW-30/8 dramatically reduces maintenance complexity compared to lubricated alternatives. There are no oil changes to schedule, no oil samples to send for laboratory analysis, no filter elements to stock and replace, and no oil separator cartridges to monitor. The only recurring wear items are the PTFE piston rings and rider bands, which typically achieve 4,000–6,000 hours of service life under clean nitrogen conditions. This maintenance simplification translates directly to reduced labor costs, lower spare parts inventory, and higher equipment availability.
Compliance & Safety Certifications
The LW-30/8 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 (Quality Management), ISO 14001:2015 (Environmental Management)
Nitrogen is classified as a simple asphyxiant gas. All LW-30/8 installations must incorporate continuous oxygen deficiency monitoring in the compressor room and all adjacent areas where nitrogen leakage could accumulate. Ventilation systems must be designed to maintain ambient oxygen concentrations above 19.5% volume per OSHA 29 CFR 1910.146 (Permit-Required Confined Spaces). Emergency shutdown interlocks should activate at 19.5% O₂ (alarm) and trigger automatic compressor isolation at 18.0% O₂ (hard shutdown). Personnel entry procedures into enclosed compressor rooms must include portable oxygen monitors and a buddy-system protocol.
Performance & Efficiency Analysis
The LW-30/8 achieves a specific power consumption of approximately 6.67 kW per m³/min of nitrogen delivered at 0.80 MPa discharge pressure. This efficiency metric positions the unit competitively within the 20–40 m³/min oil-free piston compressor segment, particularly considering the elevated discharge pressure relative to lower-pressure models. For comparison, oil-lubricated screw compressors in similar applications typically consume 7.0–7.8 kW/m³/min, while legacy single-stage piston designs may exceed 8.5 kW/m³/min at equivalent pressure ratios.
Over a standard 8,000-hour annual operating schedule, the LW-30/8’s efficiency advantage yields approximately 80,000–200,000 kWh of annual energy savings compared to less efficient alternatives. At an average industrial electricity tariff of $0.08/kWh, this represents $6,400–$16,000 in direct operating cost reduction per year. When combined with the elimination of oil-related consumables (lubricating oil, filter elements, separator cartridges, waste oil disposal), the total cost of ownership for nitrogen compression is reduced by an estimated 20–30% over a 10-year operational life.
The absence of oil in the compression path also eliminates the energy penalty associated with downstream oil-removal equipment. A typical oil-lubricated compressor of this size requires coalescing filters, activated carbon adsorbers, and monitoring instrumentation that collectively consume 3–5% of the compressor’s power output. The LW-30/8’s oil-free design removes this parasitic load entirely, further improving the net system efficiency.
Customization & OEM Capabilities
We offer comprehensive customization options to adapt the LW-30/8 to specific site conditions, integration requirements, and end-user specifications:
- Skid-Mounted Turnkey Packages: The compressor, motor, intercooler, aftercooler, instrumentation, and control panel are pre-assembled on a structural steel skid with integrated lifting lugs and anchor bolt templates. This approach reduces field installation time by approximately 60% and minimizes commissioning risks by factory-testing all interfaces before shipment.
- Hazardous Area Configurations: ATEX Zone 2 and IECEx compliant motor and electrical enclosures are available for installations in petrochemical facilities where explosive atmospheres may occasionally be present. Gas detection and automatic ventilation interlocks can be integrated into the control system to ensure safe operation in classified areas.
- 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. Automatic load/unload control and variable speed drive (VFD) compatibility optimize part-load efficiency for applications with variable nitrogen demand.
- 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 that reduce noise emission from 85 dB(A) to 72 dB(A) at 1 meter, suitable for indoor installations without dedicated compressor houses.
- OEM & Private Label: Custom paint colors, branded nameplates, and localized documentation packages are available for system integrators and gas equipment distributors. Technical manuals, spare parts lists, and maintenance procedures can be supplied in local languages to support global distribution networks.
Custom configurations are available from MOQ 1 unit. Engineering review and proposal generation typically require 5–7 business days. Prototype delivery schedules range from 12–14 weeks; repeat production orders are delivered in 8–10 weeks from order confirmation.
Case Study: VPSA Nitrogen Booster Upgrade for Steel Mill Inerting
Client: A major steel producer operating a blast furnace and continuous casting facility in Thailand
Challenge: The client’s existing oil-lubricated nitrogen booster (Japanese brand, 18 years in service) was experiencing progressive oil carryover into the nitrogen product stream. Oil contamination levels reached 3.5 mg/m³, exceeding the 0.1 mg/m³ limit specified by their food packaging division customers. The oil was also degrading the activated carbon final-polishing bed and causing frequent unplanned shutdowns for separator maintenance, resulting in approximately 120 hours of lost production annually.
Solution: We supplied an LW-30/8 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 remote monitoring capability. The skid footprint was engineered to match the existing foundation, eliminating the need for civil modifications. A 3 m³ surge vessel was added upstream to dampen pressure pulsations from the VPSA adsorption cycle and provide buffer capacity during cycle transitions.
Quantified Results After 24 Months:
- Nitrogen oil content: Reduced from 3.5 mg/m³ to <0.01 mg/m³, achieving ISO 8573-1 Class 0 certification
- Activated carbon bed replacement interval: Extended from 6 months to 36 months, saving $18,000/year in consumables
- Unplanned downtime: Reduced from 120 hours/year to zero, recovering approximately $240,000 in lost production value
- Overall maintenance expenditure: Decreased by 40% due to elimination of oil changes, filter replacements, and separator overhauls
- Energy consumption: Improved by 6.8% versus the replaced unit, equivalent to $12,800/year savings at local electricity rates
“The LW-30/8 has completely eliminated our nitrogen purity issues and unplanned downtime. Our food packaging customers are satisfied, our maintenance team has cut their workload significantly, and the energy savings are a welcome bonus. The payback period was under 20 months.” — Plant Engineering Manager
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 Optimize Your Nitrogen Compression 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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