ZW-8/6 Nitrogen Compressor – Compact Oil-Free N2 Booster for Low-Pressure Industrial Gas Systems

Engineered to deliver 8 m³/min at 0.60 MPa discharge pressure, the ZW-8/6 is a two-stage, two-row oil-free piston nitrogen compressor designed for small-scale cryogenic air separation, laboratory nitrogen supply, and compact VPSA booster stations. Zero oil contamination, space-efficient footprint, and optimized for intermittent to continuous-duty operation.

Огляд продукту

The ZW-8/6 nitrogen compressor represents a compact yet capable solution within our oil-free piston compressor family, specifically tailored for small-scale nitrogen boosting applications where space constraints and operational simplicity are paramount. With a rated capacity of 8 m³/min and a discharge pressure of 0.60 MPa, this unit occupies the entry-level segment of our industrial nitrogen compressor portfolio while maintaining the same engineering rigor as our larger models.

The ZW-8/6 distinguishes itself through a completely oil-free compression mechanism utilizing self-lubricating PTFE composite piston rings and rider bands. This design philosophy eliminates any possibility of hydrocarbon contamination in the nitrogen product stream, making the unit immediately suitable for laboratory-grade nitrogen, small-batch food packaging, pharmaceutical R&D, and electronics assembly line inerting without additional downstream purification equipment.

Its двоступеневий, дворядний (二列二级) configuration delivers a higher pressure ratio than single-stage alternatives while maintaining thermal stability through inter-stage cooling. The compact dimensions—2250 × 1296 × 2200 мм—allow the ZW-8/6 to fit into existing machinery rooms, containerized installations, or mobile nitrogen supply skids where floor space is at a premium. At just 2,00 тонни, the unit can be transported and positioned without heavy-lift equipment.

Technical Specifications – ZW-8/6

* Усі характеристики розраховані за стандартних еталонних умов (ISO 1217, Додаток C). Фактична продуктивність може відрізнятися залежно від висоти над рівнем моря, температури навколишнього середовища та умов на вході.

Основні характеристики та інженерні переваги

1. Compact Footprint for Space-Constrained Installations

О 2250 × 1296 × 2200 мм, the ZW-8/6 occupies less than 3 m² of floor space, making it one of the most compact oil-free nitrogen compressors in its capacity class. This dimensional efficiency is achieved through a vertically oriented crankcase design that minimizes the machine’s longitudinal footprint while maintaining adequate maintenance access. The 2.00-tonne weight permits installation using standard forklift equipment, eliminating the need for overhead cranes or specialized rigging during commissioning or relocation.

2. Oil-Free PTFE Sealing Technology

The ZW-8/6 employs a self-lubricating piston ring and rider band system constructed from high-performance PTFE composites. These rings operate with a coefficient of friction below 0.08 without any hydrocarbon lubricant, delivering Вміст олії класу 0 за стандартом ISO 8573-1 in the compressed nitrogen stream. For small-scale users such as analytical laboratories, food R&D facilities, and electronics manufacturers, this native oil-free certification eliminates the capital expense and maintenance burden of downstream oil-filtration systems that would otherwise be mandatory.

3. Two-Stage Compression for Higher Pressure Ratios

The двоступенева, дворядна архітектура divides the pressure ratio between a low-pressure cylinder and a high-pressure cylinder, with an inter-stage shell-and-tube cooler removing the heat of compression. This staged approach limits the discharge temperature of each stage to below 150°C, preventing thermal degradation of the PTFE sealing elements and extending valve plate life by approximately 30% compared to single-stage compressors operating at equivalent overall pressure ratios. The 0.60 MPa discharge pressure is particularly well-suited for medium-pressure nitrogen distribution in small industrial facilities.

4. Standard 380V Direct-On-Line Motor Drive

The ZW-8/6 is powered by a 55 kW, 380V, 50Hz three-phase induction motor rated to IEC 60034-1 IE3 efficiency class. The standard low-voltage configuration integrates directly into existing 380V industrial distribution panels without requiring medium-voltage infrastructure, step-down transformers, or specialized switchgear. This electrical simplicity reduces both capital expenditure and commissioning complexity, making the ZW-8/6 an attractive option for facilities upgrading from bottled nitrogen or membrane generators to on-site compression.

Сценарії застосування

Small-Scale Cryogenic Air Separation Units

In compact cryogenic ASU installations producing 200–500 Nm³/h of gaseous nitrogen, the ZW-8/6 serves as the primary nitrogen booster between the cold box and the distribution network. Its 8 m³/min capacity aligns with the output of small-scale ASUs, while the 0.60 MPa discharge pressure provides sufficient head for distribution to nearby process equipment, laboratory fume hoods, or storage tank blanketing systems. The oil-free design is critical in these applications because small ASUs typically lack the extensive purification trains found in large facilities, making downstream oil contamination particularly problematic.

Compact VPSA Nitrogen Booster Stations

For small to medium VPSA nitrogen generators producing 99.5–99.9% purity nitrogen at near-atmospheric pressure, the ZW-8/6 nitrogen booster compresses the low-pressure product to 0.60 MPa for distribution. The compact footprint of the ZW-8/6 allows it to be mounted on the same skid as the VPSA generator, creating a fully integrated nitrogen supply system that occupies minimal floor space. The oil-free compression path protects the carbon molecular sieve from hydrocarbon poisoning, preserving the generator’s separation efficiency and extending adsorbent life.

Laboratory & Analytical Gas Supply

Research laboratories, analytical chemistry facilities, and university science departments require a reliable supply of high-purity nitrogen for gas chromatography, mass spectrometry, and inert atmosphere glove boxes. The ZW-8/6’s oil-free certification ensures that the nitrogen stream meets the stringent purity requirements of analytical instruments without requiring additional purification cartridges. The 8 m³/min capacity can support multiple GC-MS systems, ICP-MS instruments, and glove boxes operating simultaneously within a single laboratory building.

Electronics Manufacturing & Soldering Inerting

In electronics assembly facilities, nitrogen is used for wave soldering inerting, reflow oven atmosphere control, and component storage dry cabinets. The ZW-8/6’s 0.60 MPa discharge pressure is adequate for feeding nitrogen distribution manifolds serving multiple soldering lines and storage cabinets. The oil-free design is non-negotiable in electronics applications because even trace oil contamination can cause solder joint defects, conformal coating adhesion failures, and contamination of sensitive optical components.

Матеріал та конструкція

The ZW-8/6 is constructed from materials selected for nitrogen compatibility, corrosion resistance, and compact structural integrity:

All pressure-bearing components conform to ASME BPVC Розділ VIII Розділ 1 or Chinese GB 150 standards. Weld joints are subjected to 100% radiographic inspection (RT), and each pressure vessel undergoes hydrostatic testing at 1.5× MAWP for a minimum 30-minute hold period before release.

Інструкції з встановлення та обслуговування

Вимоги до фундаменту та простору

The ZW-8/6 weighs 2.00 tonnes and features a low center of gravity due to its compact vertical design. A залізобетонна площадка вагою 3–4 тонни is sufficient for stable operation, mounted on elastomeric vibration isolators (natural frequency 8–12 Hz). The two-row opposed-cylinder arrangement inherently cancels first-order inertial forces, minimizing vibration transmission. Required clearances: 1.0 m on the non-drive side for valve maintenance, 0.8 m on the drive side for motor access, and 1.5 m overhead for routine service.

Технічні характеристики охолоджувальної води

Потреба у воді для охолодження становить приблизно 12 m³/h at an inlet temperature not exceeding 32°C. The water distribution circuit feeds the cylinder jackets and intercooler in parallel. Acceptable water quality: pH 6.5–8.5, total hardness < 300 mg/L as CaCO₃, chloride < 50 mg/L, suspended solids < 30 mg/L. For installations without reliable municipal water supply, a compact closed-loop cooling tower with a 1 m³ buffer tank is recommended.

Maintenance Intervals

The oil-free design of the ZW-8/6 dramatically simplifies maintenance 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 consumable wear items are the Поршневі кільця та бандажі з PTFE, які зазвичай досягають 4000–6000 годин служби в умовах чистого азоту.

Сертифікати відповідності та безпеки

The ZW-8/6 nitrogen compressor meets the following international standards and regulatory requirements:

Аналіз продуктивності та ефективності

The ZW-8/6 achieves a specific power consumption of approximately 6.88 kW per m³/min of nitrogen at 0.60 MPa discharge pressure. While this specific power is higher than our larger LW-series models due to the reduced scale efficiency, it remains competitive within the sub-10 m³/min oil-free piston compressor segment. For comparison, oil-lubricated screw compressors in this size range typically consume 7.2–8.0 kW/m³/min, and diaphragm compressors (often selected for oil-free applications) can exceed 10 kW/m³/min.

Over an 8,000-hour annual operating cycle, the ZW-8/6’s efficiency advantage versus less efficient alternatives yields approximately 20,000–45,000 kWh of energy savings per year. At $0.08/kWh, this represents $1,600–$3,600 in annual electricity cost reduction. However, the primary economic driver for ZW-8/6 selection is typically the ліквідація витратних матеріалів, пов'язаних з нафтою, та обладнання для очищення нафти після обробки а не незначну економію енергії.

The total cost of ownership for nitrogen compression in small-scale applications is dominated by maintenance labor and consumables rather than energy. The ZW-8/6’s oil-free design eliminates oil changes ($400–800/year), filter replacements ($200–400/year), separator cartridge changes ($600–1,200/year), and oil analysis ($150–300/year), delivering a total consumable savings of $1,350–$2,700 annually compared to lubricated alternatives.

Можливості налаштування та OEM

We provide flexible customization options to adapt the ZW-8/6 to specific installation constraints and end-user requirements:

• Комплекти, що монтуються на полозках: Попередньо зібрані компресор, двигун, охолоджувач і панель керування на сталевій рамі з кишенями для навантажувача та вантажними вушками. Польовий монтаж зводиться лише до підключення електромережі та охолоджувальної води.
• Мобільні причіпні установки: The ZW-8/6 can be mounted on a road-legal trailer with integrated diesel generator, cooling system, and nitrogen storage, creating a fully mobile nitrogen supply unit for construction sites, pipeline maintenance, and emergency response.
• ПЛК та дистанційний моніторинг: Додатковий ПЛК Siemens LOGO! або S7-1200 із 7-дюймовим сенсорним екраном HMI, підключенням до Ethernet та SMS/електронними сповіщеннями про тривогу. Сумісний з Modbus TCP/IP для інтеграції SCADA.
• Акустичні корпуси: Compact IP54-rated sound enclosure reducing noise from 82 dB(A) to 68 dB(A) at 1 meter, suitable for indoor installations in noise-sensitive environments such as laboratories and office-adjacent machinery rooms.
• OEM та приватна торгова марка: Індивідуальні схеми фарбування, фірмові таблички та локалізовані пакети документації для дистриб'юторів газового обладнання та системних інтеграторів.

Користувацькі конфігурації доступні з Мінімальна кількість замовлення 1 одиницяІнженерні пропозиції зазвичай доставляються протягом 3–5 робочих днів. Стандартний термін доставки становить 10–12 тижнів; для відповідних замовлень доступна прискорена доставка протягом 8 тижнів.

Case Study: Laboratory Nitrogen Supply Upgrade

Клієнт: A pharmaceutical research institute in Singapore

Виклик: The institute was purchasing liquid nitrogen in 200-liter dewars and vaporizing on-site for laboratory supply. Monthly nitrogen consumption reached 15,000 Nm³, with delivery costs, dewar rental fees, and vaporization losses consuming 40% of the annual gas budget. Additionally, liquid nitrogen deliveries were unreliable during public holidays and inclement weather, causing experiment delays.

Рішення: Ми постачали ZW-8/6 oil-free nitrogen compressor paired with a small VPSA nitrogen generator (99.9% purity, 10 m³/min) on a common skid. The ZW-8/6 boosts the VPSA product from 0.08 MPa to 0.60 MPa for distribution through the existing laboratory nitrogen header. The entire system occupies 8 m² in a corner of the building’s utility room.

Results After 18 Months:

• Nitrogen supply cost: Reduced by 52% versus liquid nitrogen purchase and delivery
• Supply reliability: 100% uptime since commissioning, zero experiment delays due to gas shortage
• Nitrogen purity: Consistently >99.9% with oil content <0.01 mg/m³, exceeding analytical instrument requirements
• Maintenance burden: One scheduled service per year (4,000-hour interval), versus monthly dewar changeovers
• Payback period: 2.4 years based on gas cost savings alone

“The ZW-8/6 compressor has transformed our nitrogen supply from a logistical headache into a reliable utility. Our researchers no longer worry about gas availability, and the finance department appreciates the 50% cost reduction.” — Facilities Manager, Pharmaceutical Research Institute

Поширені запитання та посібник з вибору

Супутні продукти та рішення

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Ready to Upgrade Your Nitrogen Supply?

Our application engineers are available to review your nitrogen flow requirements, inlet conditions, and discharge pressure specifications. We provide complimentary technical proposals, layout drawings, and TCO analyses within 48 hours.

Електронна пошта: [email protected] | Відповідь протягом 24 годин