{"id":599,"date":"2026-07-21T07:53:16","date_gmt":"2026-07-21T07:53:16","guid":{"rendered":"https:\/\/n2-compressor.com\/?post_type=product&p=599"},"modified":"2026-07-21T07:53:17","modified_gmt":"2026-07-21T07:53:17","slug":"zw-3-3-70-nitrogen-compressor","status":"publish","type":"product","link":"https:\/\/n2-compressor.com\/it\/prodotto\/zw-3-3-70-nitrogen-compressor\/","title":{"rendered":"Compressore di azoto ZW-3.3\/70 | Booster di N2 senza olio da 3,3 m\u00b3\/min per applicazioni industriali ad altissima pressione (7,00 MPa)"},"content":{"rendered":"
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ZW-3.3\/70 Nitrogen Compressor \u2013 Ultra-High-Pressure Oil-Free N2 Booster for 7.00 MPa Demanding Applications<\/p>\n

Engineered to deliver 3.3 m\u00b3\/min at 7.00 MPa discharge pressure, the ZW-3.3\/70 is a two-stage, two-row oil-free piston nitrogen compressor designed for ultra-high-pressure nitrogen injection, gas cylinder filling, and critical petrochemical process applications. Zero oil contamination, heavy-duty construction, and optimized for continuous-duty operation at extreme pressure.<\/p>\n

Richiedi un preventivo<\/a>
\nVisualizza la serie di compressori N2<\/a><\/div>\n

\"ZW-3.3\/70<\/p>\n<\/div>\n

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Panoramica del prodotto<\/h2>\n

IL ZW-3.3\/70 nitrogen compressor<\/strong> represents the pinnacle of our oil-free piston compressor engineering, purpose-built for applications where ultra-high discharge pressure is the absolute requirement. With a rated capacity of 3.3 m\u00b3\/min<\/strong> e un eccezionale 7.00 MPa discharge pressure<\/strong>, this unit occupies a specialized niche in the industrial gas compression landscape, serving the most demanding nitrogen boosting requirements in heavy industry.<\/p>\n

What distinguishes the ZW-3.3\/70 from all alternatives is its percorso di compressione completamente privo di olio<\/strong> combined with extreme pressure capability. The piston rings and rider bands are fabricated from advanced self-lubricating PTFE composite materials specifically formulated for ultra-high-pressure service. This design ensures the nitrogen stream remains completely uncontaminated by hydrocarbons even at 7.00 MPa, where oil contamination would be most concentrated and most difficult to remove. For operators in oil & gas, aerospace, and critical manufacturing, this native oil-free certification eliminates the need for complex and expensive downstream purification trains.<\/p>\n

L'architettura del compressore impiega un due stadi, due file (\u4e8c\u5217\u4e8c\u7ea7)<\/strong> configuration that is thermodynamically essential for managing the extreme pressure ratio required to achieve 7.00 MPa from typical inlet conditions. Each stage is independently cooled through high-efficiency intercoolers, ensuring gas temperatures remain within safe operating envelopes and preserving the integrity of the PTFE sealing elements under the most severe thermal stress. The reinforced frame construction and heavy-duty crankshaft assembly are engineered for a minimum service life of 100.000 ore<\/strong> secondo i protocolli di manutenzione standard.<\/p>\n

\"ZW-3.3\/70<\/p>\n<\/div>\n

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Technical Specifications \u2013 ZW-3.3\/70<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parametro<\/th>\nValore<\/th>\nUnit\u00e0<\/th>\n<\/tr>\n<\/thead>\n
Modello<\/td>\nZW-3.3\/70<\/td>\n\u2013<\/td>\n<\/tr>\n
Modello<\/td>\nDue stadi, due file (\u4e8c\u5217\u4e8c\u7ea7)<\/td>\n\u2013<\/td>\n<\/tr>\n
Capacit\u00e0<\/td>\n3.3<\/td>\nm\u00b3\/min<\/td>\n<\/tr>\n
Pressione di scarico<\/td>\n7.00<\/td>\nMPa<\/td>\n<\/tr>\n
Dimensioni del compressore (L \u00d7 P \u00d7 A)<\/td>\n1920 \u00d7 1900 \u00d7 2580<\/td>\nmm<\/td>\n<\/tr>\n
Peso<\/td>\n3.97<\/td>\nT<\/td>\n<\/tr>\n
Energia<\/td>\n75<\/td>\nkW<\/td>\n<\/tr>\n
Voltaggio<\/td>\n380<\/td>\nV<\/td>\n<\/tr>\n
Gas medio<\/td>\nAzoto (N\u2082)<\/td>\n\u2013<\/td>\n<\/tr>\n
Lubrificazione<\/td>\nSenza olio<\/td>\n\u2013<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

* Tutte le specifiche sono valutate in condizioni di riferimento standard (ISO 1217, Allegato C). Le prestazioni effettive possono variare in base all'altitudine del sito, alla temperatura ambiente e alle condizioni di ingresso.<\/em><\/p>\n<\/div>\n

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Caratteristiche principali e vantaggi ingegneristici<\/h2>\n

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

The ZW-3.3\/70 employs a proprietary Gruppo di fasce elastiche e anelli di scorrimento autolubrificanti<\/strong> manufactured from ultra-high-performance PTFE composites specifically engineered for 7.00 MPa service. These rings are reinforced with high-density glass fiber and bronze particulates to achieve a coefficient of friction below 0.05 without any external hydrocarbon lubrication. At 7.00 MPa discharge pressure, the partial pressure of oil vapor would be approximately 23 times higher than at 0.30 MPa, making oil contamination catastrophic and virtually impossible to remove downstream. The ZW-3.3\/70’s native oil-free design delivers Conformit\u00e0 alla norma ISO 8573-1 Classe 0<\/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 200\u00b0C, ensuring sealing integrity under the extreme thermal stress of ultra-high-pressure compression.<\/p>\n

2. Compressione a due stadi per rapporti di pressione estremi<\/h3>\n

IL architettura di compressione a due stadi<\/strong> of the ZW-3.3\/70 is not merely preferred but absolutely mandatory for achieving 7.00 MPa from typical inlet pressures of 0.05\u20130.10 MPa. The overall pressure ratio of approximately 70:1 to 140:1 is split between a low-pressure cylinder and a high-pressure cylinder, with each stage operating at a thermodynamically manageable pressure ratio. A high-capacity shell-and-tube intercooler between stages removes the substantial heat of compression, maintaining discharge temperatures below 170\u00b0C and preventing thermal degradation of the PTFE sealing elements. Without staged compression, the theoretical discharge temperature would exceed 350\u00b0C, far beyond the safe operating limit of any known sealing material. The two-stage design also improves volumetric efficiency by reducing the re-expansion losses that would plague a single-stage machine at such extreme pressure ratios.<\/p>\n

3. Heavy-Duty Reinforced Frame for Ultra-High-Pressure Loads<\/h3>\n

La struttura principale \u00e8 realizzata in fusione Ghisa grigia GG25<\/strong> with substantially reinforced wall sections, additional ribbing, and integral cooling water passages. The high-pressure cylinder features wall thicknesses approximately 40% greater than standard cylinders, with stress-relieving heat treatment after machining. The disposizione a due file di cilindri contrapposti<\/strong> provides natural first-order force cancellation, which is critical for ultra-high-pressure compressors where the peak gas forces on the pistons can exceed 50 tonnes per cylinder. This mechanical advantage reduces the unbalanced inertia forces transmitted to the foundation by over 80%, permitting installation on a reinforced concrete inertia block of 6\u20138 tonnes rather than the 12+ tonnes that would be required for a single-row design of equivalent pressure capability.<\/p>\n

4. Standard 380V Industrial Motor Drive with High-Torque Design<\/h3>\n

The ZW-3.3\/70 is driven by a 75 kW, 380V, 50Hz three-phase induction motor<\/strong> conforming to IEC 60034-1 efficiency class IE3, with a high-torque design optimized for the starting loads of ultra-high-pressure piston compressors. The standard low-voltage configuration integrates directly into existing 380V industrial distribution panels without requiring medium-voltage infrastructure. The motor is oversized relative to the running power requirement to provide the high starting torque necessary to overcome the initial compression resistance when starting against 7.00 MPa discharge pressure. This electrical simplicity makes the ZW-3.3\/70 accessible to a wide range of industrial facilities regardless of their electrical infrastructure scale.<\/p>\n

\"ZW-3.3\/70<\/p>\n<\/div>\n

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Scenari applicativi<\/h2>\n

Ultra-High-Pressure Nitrogen Cylinder Filling<\/h3>\n

The ZW-3.3\/70 is purpose-built for filling industrial and medical nitrogen cylinders to 15\u201320 MPa<\/strong> through a staged compression system. While the compressor’s 7.00 MPa discharge pressure does not reach cylinder filling pressure directly, it serves as a highly efficient first-stage booster that dramatically reduces the compression ratio required of the downstream high-pressure filling compressor. By boosting nitrogen from 0.05\u20130.10 MPa to 7.00 MPa, the ZW-3.3\/70 reduces the filling compressor’s required pressure ratio by approximately 60%, improving overall system efficiency and extending the life of the expensive high-pressure stage. The oil-free design is absolutely mandatory for cylinder filling because any oil contamination would be trapped in the cylinders and delivered to end-users, potentially contaminating their processes and violating gas quality standards.<\/p>\n

\"ZW-3.3\/70<\/p>\n

Oil & Gas Well Nitrogen Injection<\/h3>\n

In upstream oil and gas operations, the ZW-3.3\/70 nitrogen booster<\/a> provides high-pressure nitrogen for enhanced oil recovery (EOR), well stimulation, and gas lift operations<\/strong>. The 7.00 MPa discharge pressure is sufficient to inject nitrogen into reservoir formations at depths up to 2,000 meters, where reservoir pressures typically range from 5\u201315 MPa. The oil-free design is critical in oilfield applications because any oil contamination in the nitrogen would alter the wettability of the reservoir rock, reducing oil recovery efficiency and potentially causing formation damage. The compact footprint and 3.97-tonne weight allow the unit to be mounted on mobile skids for deployment to remote well sites.<\/p>\n

Aerospace Pressure Testing & Component Validation<\/h3>\n

Aerospace manufacturers and testing facilities require ultra-high-pressure nitrogen for pressure testing of aircraft components, hydraulic system validation, and fuel tank inerting system testing<\/strong>. The ZW-3.3\/70’s 7.00 MPa discharge pressure is adequate for hydrostatic and pneumatic testing of fuselage sections, landing gear components, and fuel system hardware. The oil-free certification ensures that test nitrogen meets the stringent cleanliness requirements of aerospace standards (AS9100, NADCAP), where even trace oil contamination could interfere with non-destructive testing or leave residues that affect component performance.<\/p>\n

\"ZW-3.3\/70<\/p>\n

High-Pressure Chemical Synthesis & Process Inerting<\/h3>\n

In chemical process industries, the ZW-3.3\/70 provides ultra-high-pressure nitrogen for processi di inertizzazione di reattori ad alta pressione, conservazione del letto catalitico ed estrazione con fluidi supercritici<\/strong>. The 7.00 MPa discharge pressure is sufficient to maintain inert atmospheres in high-pressure reactors operating at 5\u20136 MPa, providing a safety margin above the process pressure. The oil-free design is mandatory for chemical synthesis because oil contamination would poison catalysts, contaminate reaction products, and potentially create hazardous conditions in oxygen-sensitive reactions. The 3.3 m\u00b3\/min capacity can support multiple high-pressure reactors operating in parallel within a single process unit.<\/p>\n<\/div>\n

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Materiali e costruzione<\/h2>\n

The ZW-3.3\/70 is constructed from premium materials selected for ultra-high-pressure nitrogen compatibility, extreme thermal resistance, and maximum structural integrity:<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Componente<\/th>\nMateriale<\/th>\nSpecifiche<\/th>\n<\/tr>\n<\/thead>\n
Blocco cilindri (LP)<\/td>\nGhisa grigia<\/td>\nGG25 \/ HT250, spessore standard della parete<\/td>\n<\/tr>\n
Blocco cilindri (HP)<\/td>\nGhisa grigia<\/td>\nGG25 \/ HT250, reinforced wall + heavy ribbing, stress-relieved<\/td>\n<\/tr>\n
Albero motore<\/td>\nacciaio legato forgiato<\/td>\n42CrMo4, Q&T, ISO 1940 G2.5 bilanciato dinamicamente<\/td>\n<\/tr>\n
Fasce elastiche del pistone<\/td>\nUltra-High-Pressure PTFE Composite<\/td>\nHigh-density glass fiber + bronze, 200\u00b0C rated, 7 MPa certified<\/td>\n<\/tr>\n
Fasce dei cavalieri<\/td>\nComposito in PTFE<\/td>\nGuida del pistone, antigraffio, tasso di usura <0,03 mm\/1000h<\/td>\n<\/tr>\n
Piastre delle valvole<\/td>\nacciaio inossidabile<\/td>\nAcciaio inossidabile SS316, design ad anelli concentrici ad altissima pressione<\/td>\n<\/tr>\n
Bielle<\/td>\nAcciaio forgiato con cuscinetti in metallo bianco<\/td>\nTesta di biella robusta, lavorata con precisione e lubrificata a olio.<\/td>\n<\/tr>\n
Intercooler<\/td>\nGuscio in acciaio al carbonio \/ Tubi in acciaio inox SS316<\/td>\nASME VIII Div.1, prova idrostatica 1,5\u00d7, mantenimento per 30 minuti<\/td>\n<\/tr>\n
Postrefrigeratore<\/td>\nGuscio in acciaio al carbonio \/ Tubi in acciaio inox SS316<\/td>\nTubo alettato ad alta pressione, temperatura nominale dell'acqua di raffreddamento 32 \u00b0C<\/td>\n<\/tr>\n
Tubazioni ad alta pressione<\/td>\nacciaio inossidabile senza saldatura<\/td>\nSS316, ANSI Class 900 flanges, 100% X-ray inspected<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Tutti i componenti portanti sono progettati e fabbricati in stretta conformit\u00e0 con ASME BPVC Sezione VIII Divisione 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 and are 100% X-ray inspected to ensure leak-tight integrity at 7.00 MPa operating pressure.<\/p>\n

\"ZW-3.3\/70<\/p>\n<\/div>\n

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Linee guida per l'installazione e la manutenzione<\/h2>\n

Requisiti strutturali e di fondazione<\/h3>\n

The ZW-3.3\/70 has a dry weight of 3.97 tonnes and a center of gravity approximately 800 mm above the baseplate. A blocco inerziale in cemento armato da 6-8 tonnellate<\/strong> is required for stable operation, mounted on heavy-duty elastomeric vibration isolators (natural frequency 6\u20138 Hz). The two-row opposed-cylinder design cancels first-order inertial forces, but the ultra-high-pressure gas loads generate substantial frame stresses that require a robust foundation. 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. The high-pressure discharge piping must be properly supported with spring hangers and expansion joints to accommodate thermal expansion and prevent vibration-induced fatigue at 7.00 MPa.<\/p>\n

Progettazione del sistema di raffreddamento ad acqua<\/h3>\n

La richiesta di acqua di raffreddamento \u00e8 approssimativamente 15 m\u00b3\/h<\/strong> at an inlet temperature not exceeding 32\u00b0C. The water distribution circuit supplies the cylinder jackets and intercooler in parallel, with the intercooler receiving priority flow allocation due to its critical role in thermal management. Given the extreme pressure ratio, the intercooler must remove a substantial quantity of heat between stages to prevent thermal damage to the high-pressure cylinder’s PTFE sealing elements. Water quality specifications: pH 6.5\u20138.5, total dissolved solids < 500 mg\/L, chloride content < 30 mg\/L (strict limit for SS316 corrosion protection at high pressure), suspended solids < 20 mg\/L, and total hardness < 250 mg\/L as CaCO\u2083. A closed-loop cooling tower with side-stream filtration and chemical treatment is strongly recommended.<\/p>\n

Programma di manutenzione preventiva<\/h3>\n
\n\n\n\n\n\n\n\n\n\n
Intervallo<\/th>\nArticolo di servizio<\/th>\nAzione richiesta<\/th>\n<\/tr>\n<\/thead>\n
Quotidiano<\/td>\nIspezione operativa<\/td>\nCheck vibration, abnormal noise, cooling water flow, discharge pressure, temperature, leak detection<\/td>\n<\/tr>\n
200 ore<\/td>\nIspezione della piastra delle valvole<\/td>\nRimuovere e ispezionare le valvole di aspirazione\/scarico per verificare la presenza di depositi carboniosi, affaticamento delle molle, crepe e usura della sede.<\/td>\n<\/tr>\n
800 ore<\/td>\nValutazione dell'usura delle fasce elastiche del pistone<\/td>\nMisurare il gioco della scanalatura delle fasce elastiche; sostituire le fasce se il gioco supera 0,18 mm.<\/td>\n<\/tr>\n
2.500 ore<\/td>\nRevisione intermedia<\/td>\nReplace all piston rings, rider bands, and valve plate assemblies; inspect cylinder bores<\/td>\n<\/tr>\n
5.000 ore<\/td>\nRevisione completa<\/td>\nIspezionare i perni dell'albero motore, misurare il gioco dei cuscinetti principali, sostituire i cuscinetti se >0,06 mm; ispezionare il telaio<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The oil-free design of the ZW-3.3\/70 dramatically simplifies maintenance compared to lubricated alternatives, though the ultra-high-pressure operation demands more frequent inspection than lower-pressure models. There are no oil changes, no oil analysis, no filter replacements, and no separator cartridge changes. The primary consumable wear items are the Fasce elastiche e anelli di scorrimento in PTFE<\/strong>, which typically achieve 2,500\u20134,000 hours of service life under clean nitrogen conditions at 7.00 MPa. The high-pressure valve plates require more frequent inspection due to the extreme mechanical stress, with replacement intervals of 2,000\u20133,000 hours.<\/p>\n

\"ZW-3.3\/70<\/p>\n<\/div>\n

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Certificazioni di conformit\u00e0 e sicurezza<\/h2>\n

The ZW-3.3\/70 nitrogen compressor is designed, manufactured, and tested to meet or exceed the following international standards and regulatory frameworks:<\/p>\n

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Apparecchiature a pressione<\/strong>
\nASME BPVC Sezione VIII Div.1, GB 150-2011, PED 2014\/68\/UE Modulo A<\/span><\/div>\n
Sicurezza elettrica e delle macchine<\/strong>
\nIEC 60034-1 (efficienza IE3), IEC 60204-1, sicurezza macchinari ISO 12100<\/span><\/div>\n
Certificazione senza olio<\/strong>
\nISO 8573-1 Classe 0 (Contenuto di olio), testato in modo indipendente da T\u00dcV Rheinland<\/span><\/div>\n
Qualit\u00e0 e ambiente<\/strong>
\nISO 9001:2015, ISO 14001:2015<\/span><\/div>\n<\/div>\n
\u26a0\ufe0f Avviso di sicurezza critico \u2013 Funzionamento ad altissima pressione<\/strong><\/p>\n

Nitrogen is classified as a simple asphyxiant gas. At 7.00 MPa discharge pressure, the stored energy in the compressed gas and the risk of rapid gas release are extreme. All ZW-3.3\/70 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) Emergency isolation valves on both suction and discharge that close automatically on alarm; (4) Ventilation systems maintaining ambient oxygen above 19.5% per OSHA 29 CFR 1910.146; (5) Emergency shutdown interlocks activating at 19.5% O\u2082 (alarm) and triggering hard isolation at 18.0% O\u2082; (6) Personnel trained in ultra-high-pressure gas safety protocols before operating or maintaining this equipment. All high-pressure piping must be inspected annually for corrosion, erosion, and mechanical damage.<\/p>\n<\/div>\n

\"ZW-3.3\/70<\/p>\n<\/div>\n

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Analisi delle prestazioni e dell'efficienza<\/h2>\n

The ZW-3.3\/70 achieves a specific power consumption of approximately 22.73 kW per m\u00b3\/min<\/strong> of nitrogen delivered at 7.00 MPa discharge pressure. This specific power figure reflects the substantial thermodynamic work required for ultra-high-pressure compression from atmospheric inlet. Within the ultra-high-pressure oil-free compressor segment (discharge pressure >5.00 MPa), this efficiency is highly competitive. For comparison, diaphragm compressors\u2014the primary alternative for oil-free ultra-high-pressure service\u2014typically consume 25\u201335 kW\/m\u00b3\/min at equivalent pressures, while oil-lubricated reciprocating compressors consume 20\u201325 kW\/m\u00b3\/min but introduce unacceptable oil contamination.<\/p>\n

Over an 8,000-hour annual operating cycle, the ZW-3.3\/70’s efficiency advantage versus diaphragm compressors yields approximately 60,000\u2013120,000 kWh of annual energy savings<\/strong>. At $0.08\/kWh, this represents $4,800\u2013$9,600 in direct electricity cost reduction per year. However, the primary economic driver for ZW-3.3\/70 selection is typically the combination of oil-free certification, higher capacity, and lower capital cost<\/strong> compared to diaphragm alternatives. A diaphragm compressor with equivalent oil-free certification and 3.3 m\u00b3\/min capacity would cost 4\u20136 times more than the ZW-3.3\/70 and occupy significantly more space.<\/p>\n

IL costo totale di propriet\u00e0 per la compressione di azoto ad altissima pressione<\/a> is dominated by capital cost, maintenance labor, and equipment availability rather than marginal energy differences. The ZW-3.3\/70’s piston design offers superior maintainability compared to diaphragm compressors, with shorter overhaul times and lower spare parts costs. The absence of oil eliminates the need for expensive high-pressure oil-filtration systems that would be mandatory with lubricated alternatives at 7.00 MPa.<\/p>\n<\/div>\n

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Capacit\u00e0 di personalizzazione e produzione OEM<\/h2>\n

We offer comprehensive customization options to adapt the ZW-3.3\/70 to specific site conditions, integration requirements, and end-user specifications:<\/p>\n