{"id":588,"date":"2026-07-20T10:09:37","date_gmt":"2026-07-20T10:09:37","guid":{"rendered":"https:\/\/n2-compressor.com\/?post_type=product&p=588"},"modified":"2026-07-20T10:09:37","modified_gmt":"2026-07-20T10:09:37","slug":"dw-36-30-nitrogen-compressor","status":"publish","type":"product","link":"https:\/\/n2-compressor.com\/kk\/product\/dw-36-30-nitrogen-compressor\/","title":{"rendered":"DW-36\/30 Nitrogen Compressor \u2013 High-Capacity Four-Stage Oil-Free N2 Booster for 3.00 MPa Industrial Process"},"content":{"rendered":"
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DW-36\/30 Nitrogen Compressor \u2013 High-Capacity Four-Stage Oil-Free N2 Booster for 3.00 MPa Industrial Process<\/h1>\n

Engineered to deliver 36 m\u00b3\/min at 3.00 MPa discharge pressure, the DW-36\/30 is a two-stage, four-row oil-free piston nitrogen compressor designed for ultra-high-pressure nitrogen injection, gas liquefaction, chemical synthesis, and demanding petrochemical process applications. Zero oil contamination, continuous-duty rated, and built for 24\/7 industrial reliability at extreme pressure.<\/p>\n

\u0411\u0430\u0493\u0430 \u0441\u04b1\u0440\u0430\u0443<\/a>
\nView N2 Compressor Series<\/a><\/div>\n

\"DW-36\/30<\/p>\n<\/div>\n

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\u04e8\u043d\u0456\u043c\u0433\u0435 \u0448\u043e\u043b\u0443<\/h2>\n

The DW-36\/30 nitrogen compressor<\/strong> represents the pinnacle of our oil-free piston compressor engineering, purpose-built for applications where both substantial flow capacity and extreme discharge pressure are non-negotiable requirements. With a rated capacity of 36 m\u00b3\/min<\/strong> and an exceptional 3.00 MPa discharge pressure<\/strong>, this unit occupies the ultra-high-pressure segment of our industrial nitrogen compressor portfolio, serving the most demanding process applications in the chemical, petrochemical, and gas processing industries.<\/p>\n

What distinguishes the DW-36\/30 from all conventional alternatives is its fully oil-free compression pathway<\/strong> combined with a four-stage compression architecture<\/strong>. The piston rings and rider bands are fabricated from advanced self-lubricating PTFE composite materials that operate without any hydrocarbon lubricants, ensuring the nitrogen stream remains completely free of oil contamination even at the extreme pressures where oil contamination risk is most acute. This intrinsic oil-free characteristic achieves ISO 8573-1 Class 0 certification<\/strong> natively, eliminating the need for downstream oil-removal filtration that would be technically challenging and economically prohibitive at 3.00 MPa.<\/p>\n

The compressor architecture employs a two-stage, four-row (\u4e8c\u5217\u56db\u7ea7)<\/strong> configuration that is thermodynamically essential for achieving the 3.00 MPa discharge pressure from typical inlet conditions. The overall pressure ratio of approximately 30:1 to 60:1 is distributed across four compression cylinders, with each stage operating at a manageable pressure ratio. Three inter-stage coolers remove the substantial heat of compression, ensuring gas temperatures remain within safe operating limits and preserving the integrity of the PTFE sealing elements. The massive cast-iron frame and dynamically balanced forged steel crankshaft are rated for a minimum service life of 120,000 hours<\/strong> under standard maintenance protocols.<\/p>\n

\"DW-36\/30<\/p>\n<\/div>\n

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Technical Specifications \u2013 DW-36\/30<\/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
\u041c\u043e\u0434\u0435\u043b\u044c<\/td>\nDW-36\/30<\/td>\n\u2013<\/td>\n<\/tr>\n
\u04e8\u0440\u043d\u0435\u043a<\/td>\nTwo-stage, Four-row (\u4e8c\u5217\u56db\u7ea7)<\/td>\n\u2013<\/td>\n<\/tr>\n
\u0421\u044b\u0439\u044b\u043c\u0434\u044b\u043b\u044b\u0493\u044b<\/td>\n36<\/td>\n\u043c\u00b3\/\u043c\u0438\u043d<\/td>\n<\/tr>\n
\u0428\u044b\u0493\u0430\u0440\u0443 \u049b\u044b\u0441\u044b\u043c\u044b<\/td>\n3.00<\/td>\n\u041c\u041f\u0430<\/td>\n<\/tr>\n
Compressor Size (L \u00d7 W \u00d7 H)<\/td>\n5456 \u00d7 3518 \u00d7 2535<\/td>\nmm<\/td>\n<\/tr>\n
\u0421\u0430\u043b\u043c\u0430\u049b<\/td>\n13.00<\/td>\nt<\/td>\n<\/tr>\n
\u049a\u0443\u0430\u0442<\/td>\n450<\/td>\n\u043a\u0412\u0442<\/td>\n<\/tr>\n
\u0412\u043e\u043b\u044c\u0442\u0430\u0436<\/td>\n6 \u043c\u044b\u04a3 \u043d\u0435\u043c\u0435\u0441\u0435 10 \u043c\u044b\u04a3<\/td>\nV<\/td>\n<\/tr>\n
\u0413\u0430\u0437 \u043e\u0440\u0442\u0430\u0441\u044b<\/td>\nNitrogen (N\u2082)<\/td>\n\u2013<\/td>\n<\/tr>\n
Lubrication<\/td>\nOil-free<\/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. Four-Stage Compression for Extreme Pressure Ratios<\/h3>\n

The DW-36\/30 employs a four-stage compression architecture<\/strong> that is thermodynamically essential for achieving 3.00 MPa discharge pressure from typical inlet pressures of 0.05\u20130.10 MPa. The overall pressure ratio of approximately 30:1 to 60:1 is distributed across four compression cylinders, with each stage operating at a pressure ratio of approximately 2.5:1 to 3.5:1. This staged approach is critical because it limits the discharge temperature of each stage to below 150\u00b0C, preventing thermal degradation of the PTFE sealing elements and ensuring reliable long-term operation. Three high-efficiency shell-and-tube intercoolers between stages remove the substantial heat of compression, maintaining optimal thermodynamic efficiency throughout the compression path. Without four-stage compression, the discharge temperature would exceed 250\u00b0C, far beyond the safe operating limit of any oil-free sealing material.<\/p>\n

2. Ultra-High-Pressure Oil-Free PTFE Sealing Technology<\/h3>\n

The DW-36\/30 utilizes a proprietary self-lubricating piston ring and rider band assembly<\/strong> manufactured from ultra-high-performance PTFE composites specifically formulated for extreme-pressure service. These rings are reinforced with high-modulus glass fiber and bronze particulates to achieve a coefficient of friction below 0.05 without any external hydrocarbon lubrication. At 3.00 MPa discharge pressure, the partial pressure of oil vapor would be approximately 100 times higher than at 0.30 MPa, making oil contamination not merely problematic but catastrophic for downstream processes. The DW-36\/30’s native oil-free design achieves ISO 8573-1 Class 0 compliance<\/strong> without any downstream filtration, a feat that is technically impossible for lubricated compressors at this pressure level. The PTFE formulation is rated for continuous operation at temperatures up to 185\u00b0C, with emergency capability to 200\u00b0C for brief periods.<\/p>\n

3. Massive Reinforced Frame for High-Pressure Mechanical Loads<\/h3>\n

The main frame is cast from GG25 gray cast iron<\/strong> with substantially reinforced wall sections, additional ribbing, and integral cooling water passages machined directly into the casting. The peak gas forces on the pistons at 3.00 MPa are approximately 10 times higher than in 0.30 MPa compressors, requiring a frame structure of exceptional rigidity. The two-row, four-cylinder arrangement<\/strong> provides inherent force balance, with opposed cylinders canceling first-order inertial forces. This mechanical symmetry reduces the unbalanced forces transmitted to the foundation by over 85%, permitting installation on a reinforced concrete inertia block of minimum 20 tonnes<\/strong> despite the massive peak loads. The crankshaft is forged from 42CrMo4 alloy steel, dynamically balanced to ISO 1940 G1.0 standards, and supported by five main bearing journals to distribute the extreme bearing loads.<\/p>\n

4. Medium-Voltage Drive for Industrial-Scale Power<\/h3>\n

The DW-36\/30 is driven by a 450 kW medium-voltage induction motor<\/strong> available in either 6kV or 10kV configurations, conforming to IEC 60034-1 efficiency class IE3. At 450 kW, a 380V motor would require approximately 800A of current, necessitating impractically large cables and switchgear. The medium-voltage drive eliminates these constraints, allowing direct integration into industrial medium-voltage distribution networks with manageable cable sizes and standard switchgear. This electrical architecture is essential for the DW-36\/30’s power rating and reflects its positioning as a true industrial-scale compressor for large process plants.<\/p>\n

\"DW-36\/30<\/p>\n<\/div>\n

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Application Scenarios<\/h2>\n

Ultra-High-Pressure Nitrogen Injection for Enhanced Oil Recovery<\/h3>\n

In oil and gas production, the DW-36\/30 serves as a high-pressure nitrogen injection compressor<\/strong> for enhanced oil recovery (EOR) and miscible gas flooding operations. The 3.00 MPa discharge pressure is sufficient to inject nitrogen into reservoir formations at depths up to 2,000 meters, where reservoir pressures typically range from 15\u201330 MPa. While the DW-36\/30 does not reach reservoir pressure directly, it serves as the primary booster that feeds high-pressure injection pumps, reducing the overall compression energy required. The 36 m\u00b3\/min capacity can support multiple injection wells simultaneously, making it suitable for field-scale EOR projects. The oil-free design is absolutely critical because any oil contamination would damage the reservoir formation, reduce permeability, and compromise oil recovery efficiency.<\/p>\n

\"DW-36\/30<\/p>\n

Chemical Synthesis & Ammonia Plant Nitrogen Feed<\/h3>\n

In ammonia synthesis plants and chemical manufacturing facilities, the DW-36\/30 high-pressure nitrogen compressor<\/a> provides the nitrogen feed gas at the elevated pressure required for catalytic synthesis reactions. The 3.00 MPa discharge pressure is suitable for feeding Haber-Bosch ammonia synthesis loops, methanol synthesis reactors, and other high-pressure chemical processes. The oil-free design prevents catalyst poisoning, which is a major concern in catalytic synthesis where even trace oil contamination can deactivate expensive catalyst beds and require costly shutdowns for catalyst replacement. The 36 m\u00b3\/min capacity can supply the nitrogen requirements of medium-scale ammonia plants producing 300\u2013500 tonnes per day.<\/p>\n

Gas Liquefaction & Cryogenic Storage Pressure Boosting<\/h3>\n

In nitrogen liquefaction plants and cryogenic storage facilities, the DW-36\/30 compresses nitrogen to the high pressure required for Joule-Thomson expansion liquefaction cycles<\/strong> and for maintaining pressure in cryogenic storage vessels. The 3.00 MPa discharge pressure is sufficient for Claude-cycle liquefiers and for driving nitrogen through the high-pressure side of recuperative heat exchangers. The oil-free design is essential because any oil contamination would freeze in the cryogenic sections of the liquefier, blocking heat exchanger passages and causing catastrophic cold-box failure. The 36 m\u00b3\/min capacity supports liquefaction rates of 5,000\u201310,000 liters per hour of liquid nitrogen.<\/p>\n

\"DW-36\/30<\/p>\n

High-Pressure Pipeline Testing & Commissioning<\/h3>\n

In oil and gas pipeline construction, the DW-36\/30 provides high-pressure nitrogen for hydrostatic testing, pneumatic strength testing, and pipeline commissioning<\/strong>. Nitrogen is preferred over air for pneumatic testing because it eliminates the explosion risk associated with oxygen-containing mixtures. The 3.00 MPa discharge pressure is suitable for strength testing pipelines rated to ANSI Class 300 and Class 600 pressure ratings. The 36 m\u00b3\/min capacity allows rapid pressurization of large-diameter pipelines, reducing testing cycle time and accelerating project schedules. The oil-free design ensures that the tested pipeline is not contaminated with hydrocarbons that would require extensive cleaning before commissioning.<\/p>\n<\/div>\n

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Material & Construction<\/h2>\n

The DW-36\/30 is constructed from premium materials selected for ultra-high-pressure nitrogen compatibility, extreme mechanical stress resistance, and extended operational life:<\/p>\n

\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 (Stage 1\u20132)<\/td>\nGray Cast Iron<\/td>\nGG25 \/ HT250, standard wall, integral cooling<\/td>\n<\/tr>\n
Cylinder Block (Stage 3\u20134)<\/td>\nGray Cast Iron<\/td>\nGG25 \/ HT250, heavy wall + reinforced ribbing<\/td>\n<\/tr>\n
Crankshaft<\/td>\nForged Alloy Steel<\/td>\n42CrMo4, Q&T, ISO 1940 G1.0 balanced, 5 journals<\/td>\n<\/tr>\n
Piston Rings<\/td>\nPTFE-Glass-Bronze Composite<\/td>\nUltra-high-pressure rated, 185\u00b0C continuous<\/td>\n<\/tr>\n
Rider Bands<\/td>\nPTFE Composite<\/td>\nPiston guidance, anti-scuffing, wear rate <0.03 mm\/1000h<\/td>\n<\/tr>\n
Valve Plates<\/td>\nStainless Steel<\/td>\nSS316, high-pressure concentric ring, reinforced springs<\/td>\n<\/tr>\n
Intercoolers (\u00d73)<\/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-pressure finned tube, 32\u00b0C cooling water<\/td>\n<\/tr>\n
High-Pressure Piping<\/td>\nSeamless Stainless Steel<\/td>\nSS316, ANSI Class 900 flanges<\/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. 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.<\/p>\n

\"DW-36\/30<\/p>\n<\/div>\n

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Installation & Maintenance Guidelines<\/h2>\n

Foundation & Structural Requirements<\/h3>\n

The DW-36\/30 has a dry weight of 13.00 tonnes and a center of gravity approximately 1,000 mm above the baseplate. Due to the massive peak gas forces at 3.00 MPa, a reinforced concrete inertia block of minimum 20 tonnes<\/strong> is required, mounted on heavy-duty elastomeric vibration isolators (natural frequency 5\u20137 Hz). The foundation must be engineered to support dynamic loads of 2.5\u00d7 the static weight. 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 compressor house must be designed for crane access capable of lifting 15-tonne loads for major maintenance events.<\/p>\n

Cooling Water System Design<\/h3>\n

Cooling water demand is approximately 80 m\u00b3\/h<\/strong> at an inlet temperature not exceeding 32\u00b0C. The water distribution circuit supplies the cylinder jackets and three intercoolers in parallel branches, with priority flow to the intercoolers. Given the extreme pressure ratio, the intercoolers are absolutely critical for thermal management and must receive adequate cooling water flow at all times. Water quality specifications: pH 6.5\u20138.5, total dissolved solids < 400 mg\/L, chloride content < 30 mg\/L (to prevent SS316 tube corrosion in the high-pressure coolers), suspended solids < 20 mg\/L, and total hardness < 250 mg\/L as CaCO\u2083. A dedicated closed-loop cooling tower with full-stream filtration and automated chemical treatment is mandatory for reliable operation.<\/p>\n

Preventive Maintenance Schedule<\/h3>\n
\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, abnormal noise, cooling water flow, discharge pressure, temperature, intercooler performance<\/td>\n<\/tr>\n
200 hours<\/td>\nValve Plate Inspection (HP stages)<\/td>\nRemove and inspect Stage 3\u20134 valves for carbon deposits, spring fatigue, cracking, seat erosion<\/td>\n<\/tr>\n
500 hours<\/td>\nValve Plate Inspection (LP stages)<\/td>\nRemove and inspect Stage 1\u20132 valves for wear, deposits, and leakage<\/td>\n<\/tr>\n
1,000 hours<\/td>\nPiston Ring Wear Assessment<\/td>\nMeasure ring groove clearance on all stages; replace HP rings if clearance exceeds 0.18 mm<\/td>\n<\/tr>\n
3,000 hours<\/td>\nIntermediate Overhaul<\/td>\nReplace all piston rings, rider bands, and valve plate assemblies on all four stages<\/td>\n<\/tr>\n
6,000 hours<\/td>\nMajor Overhaul<\/td>\nInspect crankshaft journals, measure all bearing clearances, replace main bearings if >0.06 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The oil-free design of the DW-36\/30 dramatically reduces maintenance complexity 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<\/strong>, which typically achieve 3,000\u20135,000 hours of service life under clean nitrogen conditions. However, the high-pressure stages (Stage 3 and 4) may experience accelerated wear due to the extreme mechanical stress, and more frequent inspection is recommended for these stages.<\/p>\n

\"DW-36\/30<\/p>\n<\/div>\n

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Compliance & Safety Certifications<\/h2>\n

The DW-36\/30 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<\/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 Certification<\/strong>
\nISO 8573-1 Class 0 (Oil Content), independently tested by T\u00dcV Rheinland<\/span><\/div>\n
Quality & Environmental<\/strong>
\nISO 9001:2015, ISO 14001:2015<\/span><\/div>\n<\/div>\n
\u26a0\ufe0f Critical Safety Advisory \u2013 Ultra-High-Pressure Operation<\/strong><\/p>\n

Nitrogen is classified as a simple asphyxiant gas. At 3.00 MPa discharge pressure, the risk of catastrophic gas release and oxygen displacement is extreme. All DW-36\/30 installations must incorporate: (1) Continuous oxygen deficiency monitoring in the compressor room and all adjacent areas; (2) High-pressure discharge piping equipped with pressure relief valves rated at 110% of MAWP and rupture discs as secondary protection; (3) Automatic isolation valves on both suction and discharge that close on emergency shutdown; (4) Ventilation systems engineered to maintain ambient oxygen above 19.5% per OSHA 29 CFR 1910.146; (5) Emergency shutdown interlocks at 19.5% O\u2082 (alarm) and 18.0% O\u2082 (hard shutdown); (6) Personnel trained in ultra-high-pressure gas safety protocols before operating or maintaining this equipment. All high-pressure piping must be designed, fabricated, and inspected in accordance with ASME B31.3 Process Piping standards.<\/p>\n<\/div>\n

\"DW-36\/30<\/p>\n<\/div>\n

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Performance & Efficiency Analysis<\/h2>\n

The DW-36\/30 achieves a specific power consumption of approximately 12.50 kW per m\u00b3\/min<\/strong> 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 dramatically with pressure ratio. Within the ultra-high-pressure oil-free piston compressor segment (discharge pressure >2.50 MPa), this efficiency is competitive and significantly superior to diaphragm compressors, which are the primary alternative for oil-free service at this pressure level. For comparison, a diaphragm compressor of equivalent capacity would consume 18\u201325 kW\/m\u00b3\/min and cost 4\u20136 times more in capital expenditure.<\/p>\n

Over a standard 8,000-hour annual operating schedule, the DW-36\/30’s efficiency advantage versus diaphragm alternatives generates approximately 1,600,000\u20133,600,000 kWh of annual energy savings<\/strong>. At $0.08\/kWh, this represents $128,000\u2013$288,000 in direct electricity cost reduction per year. However, the primary economic justification for the DW-36\/30 is typically the combination of high capacity, oil-free certification, and manageable capital cost<\/strong> that is impossible to achieve with alternative technologies at this pressure level. The total cost of ownership for ultra-high-pressure nitrogen compression<\/a> is reduced by an estimated 40\u201355% over a 10-year operational life when compared to diaphragm compressor systems of equivalent capacity and purity.<\/p>\n

The absence of oil in the compression path is absolutely critical at 3.00 MPa because oil contamination becomes exponentially more concentrated and more difficult to remove as pressure increases. At 3.00 MPa, the partial pressure of oil vapor would be approximately 300 times higher than at 0.30 MPa, making conventional oil-filtration technology completely ineffective. The DW-36\/30’s native oil-free design eliminates this challenge entirely, ensuring that nitrogen purity is maintained at ISO 8573-1 Class 0 regardless of operating pressure or duration.<\/p>\n<\/div>\n

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Customization & OEM Capabilities<\/h2>\n

We offer comprehensive customization options to adapt the DW-36\/30 to specific site conditions, integration requirements, and end-user specifications:<\/p>\n