描述
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.
产品概述
这 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 完全无油压缩通道. 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
| 范围 | 价值 | 单元 |
|---|---|---|
| 模型 | LW-30/8 | – |
| 图案 | Two-stage, Two-row (二列二级) | – |
| 容量 | 30 | 立方米/分钟 |
| 排气压力 | 0.80 | 兆帕 |
| 压缩机尺寸（长×宽×高） | 2890 × 1600 × 2173 | 毫米 |
| 重量 | 4.12 | t |
| 力量 | 200 | 千瓦 |
| 电压 | 380 / 6k or 10k | V |
| 气体介质 | 氮气（N₂） | – |
| 润滑 | 无油 | – |
* 所有规格均在标准参考条件下（ISO 1217，附录 C）测得。实际性能可能因现场海拔、环境温度和进气条件而异。
主要特性及工程优势
1. Oil-Free PTFE Composite Sealing System
The LW-30/8 employs a proprietary 自润滑活塞环和导向带组件 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
这 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.
应用场景
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.
材料与施工
Every component of the LW-30/8 is selected for nitrogen compatibility, corrosion resistance, and long-term mechanical integrity under continuous-duty operation:
| 成分 | 材料 | 规格 |
|---|---|---|
| Cylinder Block | 灰铸铁 | GG25 / HT250, integral water jackets |
| 曲轴 | 锻造合金钢 | 42CrMo4, Q&T, ISO 1940 G2.5 balanced |
| 活塞环 | PTFE-Glass-Bronze Composite | Self-lubricating, wear rate <0.05 mm/1000h |
| 骑手带 | 聚四氟乙烯复合材料 | Piston guidance, prevent cylinder wall contact |
| 阀板 | 不锈钢 | 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 |
| 后冷却器 | 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 第 VIII 节第 1 部分 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.
安装和维护指南
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.
预防性维护计划
| 间隔 | 服务项目 | 需要采取的行动 |
|---|---|---|
| 日常的 | 运行检查 | Check vibration levels, abnormal noise, cooling water flow, discharge temperature |
| 250小时 | Valve Plate Inspection | Remove and inspect suction/discharge valve plates for carbon deposits or cracking |
| 1000小时 | Piston Ring Wear Assessment | Measure ring groove clearance; replace rings if clearance exceeds 0.25 mm |
| 4,000 hours | 中期大修 | Replace all piston rings, rider bands, and valve plate assemblies |
| 8,000 hours | 大修 | 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 聚四氟乙烯活塞环和活塞环带, 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.
合规与安全认证
The LW-30/8 nitrogen compressor is designed, manufactured, and tested to meet or exceed the following international standards and regulatory frameworks:
ASME BPVC 第 VIII 部分第 1 部分、GB 150-2011、PED 2014/68/EU 模块 A
IEC 60034-1 (IE3 efficiency), IEC 60204-1, ISO 12100 (machinery safety)
ISO 8573-1 0 级（含油量），经 TÜV 莱茵独立测试
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.
性能与效率分析
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.
定制化和OEM能力
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.
- 危险区域配置： 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.
- 高级过程控制： 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.
- 环境保护： 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.
可提供自定义配置 最小起订量 1 件. 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
客户： A major steel producer operating a blast furnace and continuous casting facility in Thailand
挑战： 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.
解决方案： 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:
- 氮油含量： 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
- 计划外停机： 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
- 能源消耗： 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
常见问题解答及选购指南
相关产品及解决方案
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High-flow oil-free piston compressor delivering 52 m³/min at 0.30 MPa for large-scale cryogenic ASU backup and VPSA boosting. Ideal for installations requiring maximum flow at lower pressure head.
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Medium to high-pressure oil-free compressors (0.40–2.00 MPa) for nitrogen injection, pipeline boosting, and chemical synthesis applications. Capacities from 2 to 130 m³/min.
ZW系列多级无油压缩机
Vertical, multi-stage oil-free compressors for oxygen, nitrogen, hydrogen, and specialty gases. Discharge pressures up to 9.00 MPa for high-pressure gas filling and chemical process applications.
如需全面了解我们的 工业氮气压缩机 产品组合包括无油氧气压缩机、氢气压缩机、二氧化碳压缩机和定制工程特种气体解决方案，请联系我们的应用工程团队或浏览我们的在线产品目录。
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