{"id":559,"date":"2026-07-20T06:08:30","date_gmt":"2026-07-20T06:08:30","guid":{"rendered":"https:\/\/n2-compressor.com\/?post_type=product&p=559"},"modified":"2026-07-20T06:08:43","modified_gmt":"2026-07-20T06:08:43","slug":"dw-120-8-nitrogen-compressor","status":"publish","type":"product","link":"https:\/\/n2-compressor.com\/th\/product\/dw-120-8-nitrogen-compressor\/","title":{"rendered":"DW-120\/8 Nitrogen Compressor \u2013 Ultra-High-Capacity Oil-Free N2 Booster for Demanding Industrial Gas Infrastructure"},"content":{"rendered":"
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DW-120\/8 Nitrogen Compressor \u2013 Ultra-High-Capacity Oil-Free N2 Booster for Demanding Industrial Gas Infrastructure<\/h1>\n

Engineered to deliver an exceptional 120 m\u00b3\/min at 0.80 MPa discharge pressure, the DW-120\/8 is a two-stage, two-row oil-free piston nitrogen compressor purpose-built for mega-scale cryogenic air separation, high-pressure VPSA booster stations, and extensive petrochemical pipeline distribution networks. Zero lubricant contamination, continuous-duty rated, and optimized for 24\/7 operation at the highest industrial throughput levels.<\/p>\n

Request a Quote<\/a>
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\"DW-120\/8<\/p>\n<\/div>\n

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Product Overview<\/h2>\n

The DW-120\/8 nitrogen compressor<\/strong> represents the pinnacle of our oil-free piston compressor engineering, occupying the ultra-high-capacity segment of our industrial nitrogen booster portfolio. With an extraordinary rated capacity of 120 m\u00b3\/min<\/strong> and a robust 0.80 MPa discharge pressure<\/strong>, this unit is engineered to serve the most demanding nitrogen distribution requirements in mega-scale industrial gas infrastructure worldwide.<\/p>\n

What distinguishes the DW-120\/8 from all conventional alternatives is its completely oil-free compression pathway<\/strong> utilizing self-lubricating PTFE composite piston rings and rider bands. These advanced sealing elements operate without any hydrocarbon lubricants, ensuring the nitrogen product stream remains entirely free of oil contamination. This intrinsic oil-free characteristic delivers ISO 8573-1 Class 0 certification<\/strong> natively, eliminating the capital expenditure, maintenance burden, and energy penalty of downstream oil-removal filtration systems. For operators in food processing, pharmaceutical manufacturing, semiconductor fabrication, and petrochemical processing, this native purity is non-negotiable.<\/p>\n

The compressor architecture employs a two-stage, two-row (\u4e8c\u5217\u4e8c\u7ea7)<\/strong> configuration that optimally distributes the substantial pressure ratio across two compression cylinders. This staged approach is essential for managing the thermal loads associated with compressing 120 m\u00b3\/min to 0.80 MPa while preserving the integrity of the PTFE sealing elements. Each stage features a high-efficiency intercooler, ensuring gas temperatures remain within safe operating envelopes even during sustained maximum-capacity operation. The massive cast-iron frame and dynamically balanced forged steel crankshaft are rated for a minimum service life of 120,000 hours<\/strong> under rigorous maintenance protocols.<\/p>\n

\"DW-120\/8<\/p>\n<\/div>\n

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Technical Specifications \u2013 DW-120\/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
\u0e41\u0e1a\u0e1a\u0e2d\u0e22\u0e48\u0e32\u0e07<\/td>\n\u0e14\u0e35\u0e14\u0e31\u0e1a\u0e1a\u0e25\u0e34\u0e27-120\/8<\/td>\n\u2013<\/td>\n<\/tr>\n
\u0e25\u0e27\u0e14\u0e25\u0e32\u0e22<\/td>\nTwo-stage, Two-row (\u4e8c\u5217\u4e8c\u7ea7)<\/td>\n\u2013<\/td>\n<\/tr>\n
\u0e04\u0e27\u0e32\u0e21\u0e08\u0e38<\/td>\n120<\/td>\n\u0e21\u00b3\/\u0e19\u0e32\u0e17\u0e35<\/td>\n<\/tr>\n
\u0e41\u0e23\u0e07\u0e14\u0e31\u0e19\u0e1b\u0e25\u0e48\u0e2d\u0e22<\/td>\n0.80<\/td>\n\u0e40\u0e21\u0e01\u0e30\u0e1b\u0e32\u0e2a\u0e04\u0e32\u0e25<\/td>\n<\/tr>\n
Compressor Size (L \u00d7 W \u00d7 H)<\/td>\n5800 \u00d7 3518 \u00d7 2535<\/td>\nmm<\/td>\n<\/tr>\n
\u0e19\u0e49\u0e33\u0e2b\u0e19\u0e31\u0e01<\/td>\n15.00<\/td>\nt<\/td>\n<\/tr>\n
\u0e1e\u0e25\u0e31\u0e07<\/td>\n710<\/td>\n\u0e01\u0e34\u0e42\u0e25\u0e27\u0e31\u0e15\u0e15\u0e4c<\/td>\n<\/tr>\n
\u0e41\u0e23\u0e07\u0e14\u0e31\u0e19\u0e44\u0e1f\u0e1f\u0e49\u0e32<\/td>\n6k \u0e2b\u0e23\u0e37\u0e2d 10k<\/td>\nV<\/td>\n<\/tr>\n
\u0e01\u0e4a\u0e32\u0e0b\u0e21\u0e35\u0e40\u0e14\u0e35\u0e22\u0e21<\/td>\nNitrogen (N\u2082)<\/td>\n\u2013<\/td>\n<\/tr>\n
Lubrication<\/td>\n\u0e1b\u0e23\u0e32\u0e28\u0e08\u0e32\u0e01\u0e19\u0e49\u0e33\u0e21\u0e31\u0e19<\/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. Ultra-High-Capacity Oil-Free Compression<\/h3>\n

The DW-120\/8 employs a proprietary self-lubricating piston ring and rider band system<\/strong> manufactured from high-performance PTFE composites reinforced with glass fiber and bronze particulates. This advanced material formulation achieves a coefficient of friction below 0.06 without any external hydrocarbon lubrication, completely eliminating the risk of oil vapor carryover into the nitrogen product stream. At 120 m\u00b3\/min capacity, even trace oil contamination would represent a massive cumulative contamination burden\u2014making the DW-120\/8’s native oil-free design absolutely critical. For industrial gas operators, this delivers native ISO 8573-1 Class 0 compliance<\/strong> without the capital cost, maintenance burden, or energy penalty of downstream oil-filtration equipment that would be required for a lubricated compressor of this scale.<\/p>\n

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

The two-stage compression architecture<\/strong> of the DW-120\/8 is thermodynamically optimized for the demanding 0.80 MPa discharge pressure target while managing the enormous flow volume of 120 m\u00b3\/min. By dividing the overall pressure ratio between a low-pressure cylinder and a high-pressure cylinder, the compressor achieves a significantly lower mean effective temperature per stage. A dedicated high-capacity shell-and-tube intercooler between stages removes the substantial heat of compression, maintaining discharge temperatures below 155\u00b0C even at maximum continuous load. This thermal management is essential for preserving PTFE ring integrity at this scale and extends valve plate service life by approximately 40% compared to single-stage designs operating at equivalent pressure ratios.<\/p>\n

3. Massive Cast-Iron Frame with Superior Force Balance<\/h3>\n

The main frame is cast from GG25 gray cast iron<\/strong> (equivalent to ASTM A48 Class 30B) with integral cooling water passages. The two-row opposed-cylinder arrangement<\/strong> provides natural first-order force cancellation, reducing the unbalanced inertia forces transmitted to the foundation by over 80% compared to single-row designs. Despite the massive 15.00-tonne weight, this mechanical advantage permits installation on a reinforced concrete inertia block of 25\u201330 tonnes<\/strong>\u2014proportionally lighter than the foundation requirements for single-row compressors of equivalent capacity. This foundation efficiency is particularly valuable for retrofit installations in existing compressor houses where civil modifications are costly and disruptive.<\/p>\n

4. High-Power Medium-Voltage Motor Drive<\/h3>\n

The DW-120\/8 is driven by a 710 kW medium-voltage induction motor<\/strong> available in either 6kV or 10kV configurations, conforming to IEC 60034-1 efficiency class IE3. At this power level, medium-voltage drive is essential\u2014a 380V motor would require impractical cable sizes and switchgear ratings. The medium-voltage configuration integrates directly into industrial medium-voltage distribution networks, minimizing I\u00b2R losses in power cabling and improving overall energy efficiency. For large industrial facilities with 6kV or 10kV bus systems, the DW-120\/8 offers seamless electrical compatibility without additional infrastructure investment.<\/p>\n

\"DW-120\/8<\/p>\n<\/div>\n

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Application Scenarios<\/h2>\n

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

In mega-scale cryogenic ASU facilities producing 5,000\u201315,000 Nm\u00b3\/h of gaseous nitrogen, the DW-120\/8 serves as the primary high-capacity nitrogen booster<\/strong> between the cold box and the extensive distribution network. Its 120 m\u00b3\/min capacity matches the output of the largest standalone ASUs, while the 0.80 MPa discharge pressure provides sufficient head for long-distance pipeline distribution to multiple downstream consumers across an integrated industrial complex. The oil-free design is critical in these applications because any oil contamination would compromise nitrogen purity across the entire distribution network, affecting sensitive processes in semiconductor, pharmaceutical, and food manufacturing facilities served by the same header.<\/p>\n

\"DW-120\/8<\/p>\n

Large-Scale VPSA Nitrogen Booster Stations<\/h3>\n

For large VPSA nitrogen generator installations producing 99.5\u201399.9% purity nitrogen at near-atmospheric pressure, the DW-120\/8 nitrogen booster<\/a> compresses the low-pressure product to 0.80 MPa for high-pressure distribution across extensive industrial sites. The 120 m\u00b3\/min capacity can serve multiple large VPSA generators operating in parallel, creating a centralized nitrogen supply hub. The oil-free compression path is absolutely essential in VPSA service because hydrocarbon contamination would irreversibly poison the carbon molecular sieve adsorbent, degrading separation efficiency across all generators and necessitating costly adsorbent replacement on a massive scale.<\/p>\n

Integrated Petrochemical Complex Nitrogen Distribution<\/h3>\n

In integrated petrochemical complexes, the DW-120\/8 provides high-pressure nitrogen for reactor inerting, catalyst preservation, pipeline purging, emergency nitrogen injection, and tank farm blanketing<\/strong> across multiple process units. The 0.80 MPa discharge pressure is sufficient to overcome the pressure ratings of typical process vessels, distillation columns, and reactor systems, allowing direct nitrogen injection without intermediate boosting. The 120 m\u00b3\/min capacity can simultaneously serve an entire complex through a centralized high-pressure nitrogen header, eliminating the need for multiple smaller compressors and reducing overall maintenance complexity. The oil-free certification is mandatory for petrochemical applications where nitrogen contacts catalyst beds or enters process streams.<\/p>\n

\"DW-120\/8<\/p>\n

LNG Regasification Terminal Inerting<\/h3>\n

LNG regasification terminals require massive volumes of nitrogen for storage tank inerting, pipeline purging, and emergency gas displacement<\/strong> during maintenance and upset conditions. The DW-120\/8’s 120 m\u00b3\/min capacity can rapidly inert large LNG storage tanks and maintain positive nitrogen pressure during product withdrawal cycles. The 0.80 MPa discharge pressure provides adequate head for distribution across the terminal’s extensive piping network. The oil-free design prevents oil contamination of LNG product, which would create off-specification gas and compromise downstream combustion equipment.<\/p>\n<\/div>\n

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Material & Construction<\/h2>\n

The DW-120\/8 is constructed from premium materials selected for nitrogen compatibility, high-pressure service, and extended operational life at massive scale:<\/p>\n

\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 dynamically balanced<\/td>\n<\/tr>\n
Piston Rings<\/td>\nPTFE-Glass-Bronze Composite<\/td>\nSelf-lubricating, high-temp rated to 180\u00b0C<\/td>\n<\/tr>\n
Rider Bands<\/td>\nPTFE Composite<\/td>\nPiston guidance, anti-scuffing, wear rate <0.04 mm\/1000h<\/td>\n<\/tr>\n
Valve Plates<\/td>\n\u0e2a\u0e41\u0e15\u0e19\u0e40\u0e25\u0e2a\u0e2a\u0e15\u0e35\u0e25<\/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 \/ SS316 Tubes<\/td>\nASME VIII Div.1, 1.5\u00d7 hydrotest, 30 min hold<\/td>\n<\/tr>\n
Aftercooler<\/td>\nCarbon Steel Shell \/ SS316 Tubes<\/td>\nHigh-capacity finned tube, 32\u00b0C cooling water<\/td>\n<\/tr>\n
Base Frame<\/td>\nHeavy Structural Steel<\/td>\nWelded fabrication, vibration-damped mounting<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

All pressure-bearing components are designed and fabricated in strict accordance with ASME BPVC Section VIII Division 1<\/strong> 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.<\/p>\n

\"DW-120\/8<\/p>\n<\/div>\n

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Installation & Maintenance Guidelines<\/h2>\n

Foundation & Structural Requirements<\/h3>\n

The DW-120\/8 has a dry weight of 15.00 tonnes and a center of gravity approximately 1,000 mm above the baseplate. Despite the massive scale, the two-row opposed-cylinder design minimizes unbalanced forces, permitting installation on a reinforced concrete inertia block of 25\u201330 tonnes<\/strong>. The block should be mounted on heavy-duty elastomeric vibration isolators (natural frequency 5\u20137 Hz) to prevent vibration transmission to adjacent structures and sensitive instrumentation. Minimum clearance requirements: 2.0 m on the non-drive side for valve access, 1.5 m on the drive side for motor maintenance, and 2.5 m overhead for crane access during major overhauls. The foundation must be designed to support the full static weight plus a dynamic factor of 1.5.<\/p>\n

Cooling Water System Design<\/h3>\n

Cooling water demand is approximately 120 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 branches with individual flow control valves. Water quality specifications: pH 6.5\u20138.5, 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 CaCO\u2083. For sites with marginal water quality, a dedicated closed-loop cooling tower with side-stream filtration, water softening, and chemical treatment is mandatory to prevent scale formation and corrosion in the high-capacity coolers.<\/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, bearing temperatures<\/td>\n<\/tr>\n
250 hours<\/td>\nValve Plate Inspection<\/td>\nRemove and inspect suction\/discharge valves for carbon deposits, spring fatigue, or cracking<\/td>\n<\/tr>\n
1,000 hours<\/td>\nPiston Ring Wear Assessment<\/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 main bearing clearances, replace bearings if >0.08 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The oil-free design of the DW-120\/8 dramatically reduces maintenance complexity compared to lubricated alternatives of equivalent capacity. There are no oil changes to schedule, no lubricating oil samples to analyze, no oil filter elements to replace, and no oil separator cartridges to monitor. The primary consumable 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. At this scale, the elimination of oil-related maintenance represents annual savings of $15,000\u2013$25,000 in labor and consumables alone.<\/p>\n

\"DW-120\/8<\/p>\n<\/div>\n

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Compliance & Safety Certifications<\/h2>\n

The DW-120\/8 nitrogen compressor is designed, manufactured, and tested to meet or exceed 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
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\u26a0\ufe0f Critical Safety Advisory<\/strong><\/p>\n

Nitrogen is classified as a simple asphyxiant gas. All DW-120\/8 installations must incorporate continuous oxygen deficiency monitoring in the compressor room and all adjacent areas where nitrogen leakage could accumulate. Given the massive 120 m\u00b3\/min capacity, even a minor leak can rapidly displace oxygen in enclosed spaces. Ventilation systems must be engineered 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 into enclosed compressor rooms must include portable oxygen monitors and a buddy-system protocol.<\/p>\n<\/div>\n

\"DW-120\/8<\/p>\n<\/div>\n

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Performance & Efficiency Analysis<\/h2>\n

The DW-120\/8 achieves a specific power consumption of approximately 5.92 kW per m\u00b3\/min<\/strong> of nitrogen delivered at 0.80 MPa discharge pressure. This efficiency metric is exceptional for an ultra-high-capacity oil-free piston compressor operating at an elevated pressure ratio, positioning the unit in the top tier of the 100+ m\u00b3\/min capacity class. For comparison, oil-lubricated screw compressors in similar high-pressure, high-flow applications typically consume 6.2\u20137.0 kW\/m\u00b3\/min, while legacy piston designs may exceed 7.5 kW\/m\u00b3\/min at equivalent discharge pressures.<\/p>\n

Over a standard 8,000-hour annual operating schedule, the DW-120\/8’s efficiency advantage generates approximately 240,000\u2013480,000 kWh of annual energy savings<\/strong> compared to less efficient alternatives. At an average industrial electricity tariff of $0.08\/kWh, this represents $19,200\u2013$38,400 in direct operating cost reduction per year. When combined with the complete elimination of oil-related consumables (lubricating oil, filter elements, separator cartridges, waste oil disposal, and oil analysis), the total cost of ownership for nitrogen compression<\/a> is reduced by an estimated 22\u201332% 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 would require massive coalescing filter systems, activated carbon adsorber beds, and continuous oil monitoring instrumentation that collectively consume 3\u20135% of the compressor’s power output\u2014equivalent to 21\u201335 kW of parasitic load. The DW-120\/8’s oil-free design removes this parasitic load entirely, further improving effective system efficiency and reducing the electrical infrastructure requirements.<\/p>\n<\/div>\n

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Customization & OEM Capabilities<\/h2>\n

We offer comprehensive customization options to adapt the DW-120\/8 to specific site conditions, integration requirements, and end-user specifications:<\/p>\n