{"id":551,"date":"2026-07-20T05:22:25","date_gmt":"2026-07-20T05:22:25","guid":{"rendered":"https:\/\/n2-compressor.com\/?post_type=product&p=551"},"modified":"2026-07-20T05:22:25","modified_gmt":"2026-07-20T05:22:25","slug":"lw-20-8-nitrogen-compressor","status":"publish","type":"product","link":"https:\/\/n2-compressor.com\/fa\/product\/lw-20-8-nitrogen-compressor\/","title":{"rendered":"LW-20\/8 Nitrogen Compressor \u2013 Mid-Capacity Oil-Free N2 Booster for Continuous Industrial Operations"},"content":{"rendered":"
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LW-20\/8 Nitrogen Compressor \u2013 Mid-Capacity Oil-Free N2 Booster for Continuous Industrial Operations<\/h1>\n

Delivering 20 m\u00b3\/min at 0.80 MPa discharge pressure, the LW-20\/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 distribution. Zero lubricant contamination, 24\/7 continuous-duty rated, and built for demanding industrial environments.<\/p>\n

\u062f\u0631\u062e\u0648\u0627\u0633\u062a \u0642\u06cc\u0645\u062a<\/a>
\nView N2 Compressor Series<\/a><\/div>\n

\"LW-20\/8<\/p>\n<\/div>\n

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Product Overview<\/h2>\n

The LW-20\/8 nitrogen compressor<\/strong> occupies a strategic position in our oil-free piston compressor lineup, bridging the gap between compact entry-level units and large-scale industrial boosters. With a rated capacity of 20 m\u00b3\/min<\/strong> and a discharge pressure of 0.80 MPa<\/strong>, this model serves as the backbone of medium-scale nitrogen distribution systems across cryogenic air separation, petrochemical inerting, and food processing industries.<\/p>\n

What sets the LW-20\/8 apart from conventional alternatives is its fully oil-free compression pathway<\/strong>. The piston rings and rider bands are precision-machined from self-lubricating PTFE composite materials that operate without hydrocarbon lubricants, ensuring the nitrogen stream remains completely free of oil contamination. This native oil-free characteristic is essential for applications demanding ISO 8573-1 Class 0 certification, including food-grade nitrogen blanketing, pharmaceutical process inerting, and electronics manufacturing atmosphere control.<\/p>\n

The compressor employs a two-stage, two-row (\u4e8c\u5217\u4e8c\u7ea7)<\/strong> architecture that thermodynamically optimizes the pressure ratio across two cylinders. Each stage is independently cooled via a dedicated intercooler, maintaining discharge temperatures within safe operating limits even during sustained 24\/7 operation. The robust cast-iron frame and dynamically balanced forged steel crankshaft are engineered for a minimum service life of 15 years<\/strong> under standard maintenance protocols.<\/p>\n

\"LW-20\/8<\/p>\n<\/div>\n

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Technical Specifications \u2013 LW-20\/8<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\nUnit<\/th>\n<\/tr>\n<\/thead>\n
\u0645\u062f\u0644<\/td>\nLW-20\/8<\/td>\n\u2013<\/td>\n<\/tr>\n
\u0627\u0644\u06af\u0648<\/td>\nTwo-stage, Two-row (\u4e8c\u5217\u4e8c\u7ea7)<\/td>\n\u2013<\/td>\n<\/tr>\n
\u0638\u0631\u0641\u06cc\u062a<\/td>\n20<\/td>\n\u0645\u062a\u0631 \u0645\u06a9\u0639\u0628 \u062f\u0631 \u062f\u0642\u06cc\u0642\u0647<\/td>\n<\/tr>\n
\u0641\u0634\u0627\u0631 \u062a\u062e\u0644\u06cc\u0647<\/td>\n0.80<\/td>\n\u0645\u06af\u0627\u067e\u0627\u0633\u06a9\u0627\u0644<\/td>\n<\/tr>\n
Compressor Size (L \u00d7 W \u00d7 H)<\/td>\n2732 \u00d7 1550 \u00d7 2432<\/td>\nmm<\/td>\n<\/tr>\n
\u0648\u0632\u0646<\/td>\n3.00<\/td>\nt<\/td>\n<\/tr>\n
\u0642\u062f\u0631\u062a<\/td>\n132<\/td>\n\u06a9\u06cc\u0644\u0648\u0648\u0627\u062a<\/td>\n<\/tr>\n
\u0648\u0644\u062a\u0627\u0698<\/td>\n380<\/td>\nV<\/td>\n<\/tr>\n
\u06af\u0627\u0632 \u0645\u062a\u0648\u0633\u0637<\/td>\nNitrogen (N\u2082)<\/td>\n\u2013<\/td>\n<\/tr>\n
Lubrication<\/td>\n\u0628\u062f\u0648\u0646 \u0631\u0648\u063a\u0646<\/td>\n\u2013<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

* 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.<\/em><\/p>\n<\/div>\n

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Key Features & Engineering Advantages<\/h2>\n

1. Oil-Free PTFE Composite Sealing System<\/h3>\n

The LW-20\/8 utilizes an advanced self-lubricating piston ring and rider band assembly<\/strong> manufactured from high-density PTFE composites reinforced with glass fiber and bronze particulates. This material system achieves a 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 regulated industries, this delivers ISO 8573-1 Class 0 compliance<\/strong> natively\u2014without the capital expense, maintenance burden, or energy penalty of downstream oil-removal filtration systems.<\/p>\n

2. Two-Stage Thermodynamic Optimization<\/h3>\n

The two-stage compression arrangement<\/strong> splits the overall pressure ratio between a low-pressure cylinder and a high-pressure cylinder, reducing the mean effective temperature per stage and improving volumetric efficiency. An integrated shell-and-tube intercooler removes the heat of compression between stages, maintaining discharge temperatures below 155\u00b0C even at maximum continuous load. This thermal management strategy extends valve plate service life by approximately 35% compared to single-stage designs operating at equivalent pressure ratios, while also preventing thermal degradation of the PTFE sealing elements.<\/p>\n

3. Heavy-Duty Frame with Inherent Force Balance<\/h3>\n

The compressor block is cast from GG25 gray cast iron<\/strong> (equivalent to ASTM A48 Class 30B) with integral cooling water passages. The two-row opposed-cylinder configuration provides natural first-order force cancellation, reducing unbalanced inertia forces transmitted to the foundation by over 80% versus single-row designs. This mechanical advantage permits installation on a lighter concrete inertia block (minimum 5 tonnes versus 8+ tonnes for single-row equivalents), reducing civil engineering costs and simplifying retrofit installations in existing compressor houses or machinery rooms.<\/p>\n

4. Standard 380V Industrial Motor Drive<\/h3>\n

The LW-20\/8 is driven by a 132 kW, 380V, 50Hz three-phase induction motor<\/strong> conforming to IEC 60034-1 IE3 efficiency class. The standard low-voltage configuration integrates directly into existing 380V industrial distribution panels without requiring medium-voltage switchgear, step-down transformers, or specialized electrical infrastructure. This simplifies both capital expenditure and commissioning timelines, making the LW-20\/8 an attractive upgrade path for facilities transitioning from bottled nitrogen or membrane generators to on-site compressed nitrogen supply.<\/p>\n

\"LW-20\/8<\/p>\n<\/div>\n

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Application Scenarios<\/h2>\n

Medium-Scale Cryogenic Air Separation Plants<\/h3>\n

In cryogenic ASU facilities producing 500\u20131,500 Nm\u00b3\/h of gaseous nitrogen, the LW-20\/8 serves as the primary nitrogen booster<\/strong> between the cold box and the distribution header. Its 20 m\u00b3\/min capacity matches the output of medium-scale ASUs, while the 0.80 MPa discharge pressure is optimized for pipeline distribution to downstream consumers such as chemical reactors, steel mill ladle inerting systems, and LNG facility purge gas networks. The oil-free design is particularly critical in ASU backup scenarios where nitrogen purity cannot be compromised during primary system maintenance or cold box upsets.<\/p>\n

\"LW-20\/8<\/p>\n

VPSA Nitrogen Booster Stations<\/h3>\n

Vacuum Pressure Swing Adsorption (VPSA) nitrogen generators produce gaseous nitrogen at near-atmospheric pressure (0.05\u20130.10 MPa). The LW-20\/8 nitrogen booster<\/a> compresses this low-pressure product to 0.80 MPa for distribution to point-of-use applications. The oil-free compression path is essential in VPSA service because any hydrocarbon contamination would poison the carbon molecular sieve adsorbent, permanently degrading the generator’s separation efficiency and necessitating costly adsorbent replacement. The 20 m\u00b3\/min capacity supports medium-scale VPSA installations serving multiple industrial consumers through a centralized nitrogen header.<\/p>\n

Petrochemical Tank Farm Blanketing & Inerting<\/h3>\n

Refinery tank farms and petrochemical storage facilities require substantial volumes of nitrogen for tank blanketing, inerting, and gas padding<\/strong> to prevent explosive vapor formation and maintain product quality. The LW-20\/8’s continuous-duty rating and 0.80 MPa discharge pressure make it capable of serving multiple storage tanks simultaneously through a centralized nitrogen distribution header. The pressure head is sufficient to overcome tank pressure relief valve settings and maintain positive pressure during product withdrawal cycles, even in facilities with elevated tank geometries or long distribution pipelines.<\/p>\n

\"LW-20\/8<\/p>\n

Food Processing & Modified Atmosphere Packaging<\/h3>\n

Large-scale food processing facilities utilize nitrogen for modified atmosphere packaging (MAP), controlled atmosphere storage, and nitrogen sparging<\/strong> to extend product shelf life and maintain freshness. The LW-20\/8’s 20 m\u00b3\/min capacity can simultaneously supply multiple high-speed packaging lines, nitrogen-flush tunnels, and storage vaults. The oil-free certification ensures compliance with FDA 21 CFR 173.310 and EU Regulation 231\/2012 for food-contact nitrogen, eliminating the risk of off-flavors, rancidity, or product discoloration that can occur with lubricated compressor alternatives.<\/p>\n<\/div>\n

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Material & Construction<\/h2>\n

Every component of the LW-20\/8 is selected for nitrogen service compatibility, corrosion resistance, and long-term mechanical durability:<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
Component<\/th>\nMaterial<\/th>\nSpecification<\/th>\n<\/tr>\n<\/thead>\n
Cylinder Block<\/td>\nGray Cast Iron<\/td>\nGG25 \/ HT250, integral cooling water jackets<\/td>\n<\/tr>\n
Crankshaft<\/td>\nForged Alloy Steel<\/td>\n42CrMo4, Q&T, ISO 1940 G2.5 balanced<\/td>\n<\/tr>\n
Piston Rings<\/td>\nPTFE-Glass-Bronze Composite<\/td>\nSelf-lubricating, wear rate <0.05 mm\/1000h<\/td>\n<\/tr>\n
Rider Bands<\/td>\nPTFE Composite<\/td>\nPiston guidance, prevent cylinder wall contact<\/td>\n<\/tr>\n
Valve Plates<\/td>\nStainless Steel<\/td>\nSS316, concentric ring spring-loaded design<\/td>\n<\/tr>\n
Connecting Rods<\/td>\nForged Steel with Babbitt Bearings<\/td>\nPrecision-machined, oil-lubricated big end<\/td>\n<\/tr>\n
Intercooler<\/td>\nCarbon Steel Shell \/ SS304 Tubes<\/td>\nASME VIII Div.1, 1.5\u00d7 hydrostatic test<\/td>\n<\/tr>\n
Aftercooler<\/td>\nCarbon Steel Shell \/ SS304 Tubes<\/td>\nFinned tube design, 32\u00b0C cooling water rated<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

All pressure-bearing components are designed and fabricated in accordance with ASME BPVC Section VIII Division 1<\/strong> or Chinese GB 150 standards. Weld joints undergo 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.<\/p>\n

\"LW-20\/8<\/p>\n<\/div>\n

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Installation & Maintenance Guidelines<\/h2>\n

Foundation & Mounting Requirements<\/h3>\n

The LW-20\/8 has a dry weight of 3.00 tonnes and a center of gravity approximately 820 mm above the baseplate. Thanks to the two-row opposed-cylinder design, unbalanced forces are minimal, permitting installation on a reinforced concrete inertia block of 5\u20136 tonnes<\/strong>. The block should be mounted on elastomeric vibration isolators (natural frequency 6\u20138 Hz) to prevent vibration transmission to adjacent structures. Minimum clearance requirements: 1.2 m on the non-drive side for valve access, 1.0 m on the drive side for motor maintenance, and 1.8 m overhead for crane access during major overhauls.<\/p>\n

Cooling Water System Specifications<\/h3>\n

Cooling water flow requirement is approximately 22 m\u00b3\/h<\/strong> at an inlet temperature not exceeding 32\u00b0C. The water distribution circuit supplies the cylinder jackets, intercooler, and aftercooler in parallel. Water quality specifications: pH 6.5\u20138.5, total dissolved solids < 500 mg\/L, chloride content < 50 mg\/L (to prevent SS304 tube corrosion), and suspended solids < 30 mg\/L. For sites with marginal water quality, a closed-loop cooling tower with side-stream filtration and chemical treatment is strongly recommended to prevent scale formation and tube fouling.<\/p>\n

Preventive Maintenance Schedule<\/h3>\n
\n\n\n\n\n\n\n\n\n\n
Interval<\/th>\nService Item<\/th>\nAction Required<\/th>\n<\/tr>\n<\/thead>\n
Daily<\/td>\nOperational Inspection<\/td>\nCheck vibration levels, abnormal noise, cooling water flow, discharge temperature<\/td>\n<\/tr>\n
250 hours<\/td>\nValve Plate Inspection<\/td>\nRemove and inspect suction\/discharge valves for carbon deposits or cracking<\/td>\n<\/tr>\n
1,000 hours<\/td>\nPiston Ring Measurement<\/td>\nMeasure ring groove clearance; replace rings if clearance exceeds 0.25 mm<\/td>\n<\/tr>\n
4,000 hours<\/td>\nIntermediate Overhaul<\/td>\nReplace all piston rings, rider bands, and valve plate assemblies<\/td>\n<\/tr>\n
8,000 hours<\/td>\nMajor Overhaul<\/td>\nInspect crankshaft journals, measure bearing clearances, replace main bearings if >0.08 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The oil-free design of the LW-20\/8 significantly reduces maintenance complexity compared to lubricated alternatives. There are no oil changes to schedule, no oil samples to analyze, no filter elements to replace, and no oil separator cartridges to monitor. The only recurring wear items are the PTFE piston rings and rider bands<\/strong>, which typically achieve 4,000\u20136,000 hours of service life under clean nitrogen conditions.<\/p>\n

\"LW-20\/8<\/p>\n<\/div>\n

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Compliance & Safety Certifications<\/h2>\n

The LW-20\/8 nitrogen compressor is designed, manufactured, and tested to meet the following international standards and regulatory frameworks:<\/p>\n

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Pressure Equipment Directive<\/strong>
\nASME BPVC Section VIII Div.1, GB 150-2011, PED 2014\/68\/EU Module A<\/span><\/div>\n
Electrical & Machine Safety<\/strong>
\nIEC 60034-1 (IE3 efficiency), IEC 60204-1, ISO 12100 (Machinery Safety)<\/span><\/div>\n
Oil-Free Air Quality<\/strong>
\nISO 8573-1 Class 0 (Oil Content), independently tested by T\u00dcV Rheinland<\/span><\/div>\n
Quality & Environmental<\/strong>
\nISO 9001:2015 (Quality Management), ISO 14001:2015 (Environmental Management)<\/span><\/div>\n<\/div>\n
\u26a0\ufe0f Critical Safety Advisory<\/strong><\/p>\n

Nitrogen is classified as a simple asphyxiant gas. All LW-20\/8 installations must incorporate continuous oxygen deficiency monitoring in the compressor room and adjacent areas. Ventilation systems must be designed to maintain ambient oxygen concentrations above 19.5% volume per OSHA 29 CFR 1910.146. Emergency shutdown interlocks should activate at 19.5% O\u2082 (alarm) and trigger automatic compressor isolation at 18.0% O\u2082 (hard shutdown). Personnel entry procedures must include portable oxygen monitors and buddy-system protocols.<\/p>\n<\/div>\n

\"LW-20\/8<\/p>\n<\/div>\n

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Performance & Efficiency Analysis<\/h2>\n

The LW-20\/8 achieves a specific power consumption of approximately 6.60 kW per m\u00b3\/min<\/strong> of nitrogen delivered at 0.80 MPa discharge pressure. This efficiency metric positions the unit competitively within the 15\u201330 m\u00b3\/min oil-free piston compressor segment. For comparison, typical oil-lubricated screw compressors operating at equivalent pressure ratios consume 7.0\u20137.8 kW\/m\u00b3\/min, while older single-stage piston designs may exceed 8.5 kW\/m\u00b3\/min.<\/p>\n

Over a standard 8,000-hour annual operating schedule, the LW-20\/8’s efficiency advantage yields approximately 64,000\u2013160,000 kWh of annual energy savings<\/strong> compared to less efficient alternatives. At an average industrial electricity tariff of $0.08\/kWh, this translates to $5,120\u2013$12,800 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<\/a> is reduced by an estimated 20\u201330% over a 10-year operational life.<\/p>\n

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 oil monitoring instrumentation that collectively consume 3\u20135% of the compressor’s power output. The LW-20\/8’s oil-free design removes this parasitic load entirely, improving overall system efficiency.<\/p>\n<\/div>\n

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Customization & OEM Capabilities<\/h2>\n

We offer comprehensive customization options to adapt the LW-20\/8 to specific site conditions, integration requirements, and end-user specifications:<\/p>\n