LW-60/8 stikstofcompressor – Olievrije N2-booster met ultrahoge capaciteit voor veeleisende industriële netwerken van 0,80 MPa

De LW-60/8 is een tweetraps, tweerijige olievrije zuigercompressor voor stikstof, ontworpen om 60 m³/min te leveren bij een persdruk van 0,80 MPa. Deze compressor is speciaal ontwikkeld voor grootschalige cryogene luchtscheiding, hogedruk VPSA-boosterstations en intensieve distributie via pijpleidingen voor petrochemische producten. De compressor is vrij van smeermiddelverontreiniging, geschikt voor continu gebruik en geoptimaliseerd voor onafgebroken industrieel gebruik, 24 uur per dag, 7 dagen per week, onder verhoogde druk.

Productoverzicht

De LW-60/8 nitrogen compressor represents the pinnacle of our oil-free piston compressor portfolio, engineered to satisfy the most demanding nitrogen boosting requirements in large-scale industrial gas infrastructure. With an exceptional 60 m³/min capacity in combinatie met een robuuste 0,80 MPa uitlaatdruk, this unit stands as the workhorse of mega-scale cryogenic air separation plants, high-pressure VPSA booster stations, and intensive petrochemical distribution networks where both flow and pressure are non-negotiable.

What distinguishes the LW-60/8 from conventional lubricated alternatives is its intrinsically oil-free compression pathway. The piston rings and rider bands are fabricated from proprietary self-lubricating PTFE composite materials that operate entirely without hydrocarbon lubricants. This design philosophy ensures the nitrogen product stream remains absolutely free of oil contamination, achieving ISO 8573-1 Klasse 0-certificering without any downstream purification equipment. For operators in food processing, pharmaceutical manufacturing, semiconductor fabrication, and petrochemical processing, this native oil-free characteristic eliminates the capital expenditure, maintenance burden, and energy penalty of oil-filtration systems.

De compressorarchitectuur volgt een tweetraps, twee rijen (二列二级) configuration that optimally distributes the substantial pressure ratio across two compression cylinders. This staged approach is essential for managing the thermal loads associated with 0.80 MPa discharge pressure while preserving the dimensional integrity of the PTFE sealing elements. Each stage incorporates an independent 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 uur volgens standaard onderhoudsprotocollen.

Technical Specifications – LW-60/8

* Alle specificaties zijn gebaseerd op standaard referentieomstandigheden (ISO 1217, bijlage C). De werkelijke prestaties kunnen variëren afhankelijk van de hoogte van de locatie, de omgevingstemperatuur en de inlaatcondities.

Belangrijkste kenmerken en technische voordelen

1. Hittebestendige PTFE-composietafdichtingstechnologie

The LW-60/8 employs an advanced zelfsmurende zuigerveer- en geleidebandassemblage manufactured from proprietary PTFE composites reinforced with glass fiber, carbon graphite, and bronze particulates. This material formulation achieves a coefficient of friction below 0.06 without any external hydrocarbon lubrication, completely eliminating oil vapor carryover into the nitrogen product stream. The rings are specifically engineered for the elevated discharge temperatures associated with 0.80 MPa operation, maintaining dimensional stability and sealing effectiveness up to 185°C. For industrial gas operators, this delivers native ISO 8573-1 Klasse 0-conformiteit without the capital cost, maintenance complexity, or energy penalty of downstream oil-filtration equipment.

2. Advanced Two-Stage Thermodynamic Optimization

De tweetraps compressiearchitectuur of the LW-60/8 is thermodynamically optimized for the demanding 0.80 MPa discharge pressure target. By dividing the substantial overall pressure ratio between a low-pressure cylinder and a high-pressure cylinder, the compressor achieves a significantly lower mean effective temperature per stage compared to single-stage designs. A dedicated high-efficiency shell-and-tube intercooler between stages removes the heat of compression, maintaining discharge temperatures below 160°C even at maximum continuous load. This thermal management is critical for preserving PTFE ring integrity and extending valve plate service life by approximately 45% versus single-stage alternatives operating at equivalent pressure ratios.

3. Massive Cast-Iron Frame with Superior Force Balance

Het hoofdframe is gegoten uit GG25 grijs gietijzer (equivalent to ASTM A48 Class 30B) with integral cooling water passages machined directly into the casting. The tweerijige opstelling van tegenover elkaar geplaatste cilinders provides natural first-order force cancellation, reducing the unbalanced inertia forces transmitted to the foundation by over 85% compared to single-row designs of equivalent capacity. This mechanical advantage permits installation on a reinforced concrete inertia block of minimum 12 tonnes (versus 18+ tonnes for single-row equivalents), significantly reducing civil engineering costs and simplifying retrofit installations in existing compressor houses where foundation capacity may be constrained.

4. Medium-Voltage Motor Drive for Large-Scale Integration

The LW-60/8 is driven by a 350 kW medium-voltage induction motor available in either 6kV or 10kV configurations, conforming to IEC 60034-1 efficiency class IE3. The medium-voltage drive eliminates the need for oversized low-voltage switchgear and impractically heavy-gauge cabling that would be required for a 380V motor of this power rating. Direct integration into industrial medium-voltage distribution networks reduces electrical infrastructure costs, minimizes I²R losses in power cabling, and improves overall energy efficiency. For facilities with 6kV or 10kV bus systems standard in large industrial plants, the LW-60/8 offers seamless electrical compatibility.

Toepassingsscenario's

Mega-schaal cryogene luchtseparatie-installaties

In mega-scale cryogenic ASU facilities producing 3,000–8,000 Nm³/h of gaseous nitrogen, the LW-60/8 serves as the primaire stikstofbooster met hoge capaciteit between the cold box and the distribution header. Its 60 m³/min capacity matches the output of the largest single-train ASUs, while the 0.80 MPa discharge pressure provides ample head for long-distance pipeline distribution to downstream consumers such as integrated steel complexes, petrochemical crackers, and LNG liquefaction trains. The oil-free design is absolutely critical in these applications because any oil contamination would compromise the purity of nitrogen supplied to the most sensitive processes, including semiconductor wafer fabrication and pharmaceutical aseptic filling lines served by the same distribution network.

Hogedruk VPSA-stikstofboosterstations

Voor grote VPSA-stikstofgeneratoren die stikstof met een zuiverheid van 99,5–99,9% produceren bij een druk die dicht bij de atmosferische druk ligt, geldt het volgende: LW-60/8 nitrogen booster compresses the low-pressure product to 0.80 MPa for high-pressure distribution. The elevated discharge pressure is particularly valuable for VPSA installations serving extensive industrial parks or multiple facilities through a centralized high-pressure header, where pressure losses across the distribution network can be substantial. The oil-free compression path is non-negotiable in VPSA service because hydrocarbon contamination would irreversibly poison the carbon molecular sieve adsorbent, permanently degrading separation efficiency and necessitating costly complete adsorbent replacement.

Intensive Petrochemical High-Pressure Nitrogen Systems

In large petrochemical complexes and refinery operations, the LW-60/8 provides high-pressure nitrogen for reactor inerting, catalyst preservation, pipeline purging, emergency vessel injection, and hydrotest filling. The 0.80 MPa discharge pressure is sufficient to overcome the pressure ratings of the largest process vessels and reactor systems, allowing direct nitrogen injection without intermediate boosting stages. The continuous-duty rating ensures uninterrupted nitrogen availability during extended turnaround campaigns that may span several weeks. The oil-free certification is mandatory for petrochemical applications where nitrogen contacts catalyst beds or enters process streams that must remain completely hydrocarbon-free.

Integrated Steel Mill High-Pressure Inerting

Large integrated steel mills with multiple blast furnaces, basic oxygen furnaces, and continuous casting lines require enormous volumes of nitrogen for blast furnace gas sealing, tundish inerting, ladle metallurgy, and coke oven gas purging. The LW-60/8’s 60 m³/min capacity can serve multiple blast furnaces or an entire casting complex simultaneously through a centralized high-pressure nitrogen header. The 0.80 MPa discharge pressure provides adequate head to overcome the back-pressure of the largest blast furnace gas systems and maintain positive sealing gas flow at all tuyere levels. The oil-free design prevents oil contamination of blast furnace gas, which would foul downstream gas cleaning equipment and compromise the quality of recovered blast furnace gas used for power generation and heating.

Materiaal en constructie

The LW-60/8 is constructed from premium materials selected for nitrogen compatibility, high-pressure service, and extended operational life under demanding conditions:

Alle drukdragende componenten worden ontworpen en vervaardigd in strikte overeenstemming met ASME BPVC Sectie VIII Divisie 1 of de Chinese GB 150-normen. Elke lasverbinding ondergaat een 100%-radiografische inspectie (RT) volgens ASME Sectie V, Artikel 2, en elk voltooid drukvat wordt onderworpen aan een hydrostatische druktest bij 1,5 keer de maximaal toelaatbare werkdruk (MAWP) gedurende een minimale wachttijd van 30 minuten.

Installatie- en onderhoudsrichtlijnen

Fundament- en constructie-eisen

The LW-60/8 has a dry weight of 6.50 tonnes and a center of gravity approximately 950 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 12–14 tonnes. The block should be mounted on elastomeric vibration isolators (natural frequency 6–8 Hz) to prevent vibration transmission to adjacent structures and sensitive instrumentation. Minimum clearance requirements: 1.5 m on the non-drive side for valve access, 1.2 m on the drive side for motor maintenance, and 2.0 m overhead for crane access during major overhauls.

Ontwerp van koelwatersystemen

De koelwaterbehoefte bedraagt ​​ongeveer 60 m³/h at an inlet temperature not exceeding 32°C. The water distribution circuit supplies the cylinder jackets, intercooler, and aftercooler in parallel branches. Water quality specifications: pH 6.5–8.5, total dissolved solids < 500 mg/L, chloride content < 50 mg/L (to prevent SS316 tube corrosion in the coolers), suspended solids < 30 mg/L, and total hardness < 300 mg/L as CaCO₃. 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 corrosion.

Preventief onderhoudsschema

The oil-free design of the LW-60/8 dramatically reduces maintenance complexity compared to lubricated alternatives. 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-zuigerveren en geleidebanden, which typically achieve 4,000–6,000 hours of service life under clean nitrogen conditions. This maintenance simplification translates to lower labor costs, reduced spare parts inventory, and higher equipment availability.

Certificeringen voor naleving en veiligheid

The LW-60/8 nitrogen compressor is designed, manufactured, and tested to meet or exceed the following international standards and regulatory frameworks:

Prestatie- en efficiëntieanalyse

The LW-60/8 achieves a specific power consumption of approximately 5.83 kW per m³/min of nitrogen delivered at 0.80 MPa discharge pressure. This efficiency metric is competitive for an ultra-high-capacity oil-free piston compressor operating at an elevated pressure ratio, positioning the unit favorably within the 50–70 m³/min capacity class. For comparison, oil-lubricated screw compressors in similar high-pressure applications typically consume 6.2–7.0 kW/m³/min, while legacy single-stage piston designs may exceed 8.0 kW/m³/min at equivalent discharge pressures.

Over a standard 8,000-hour annual operating schedule, the LW-60/8’s efficiency advantage generates approximately 180,000–420,000 kWh of annual energy savings compared to less efficient alternatives. At an average industrial electricity tariff of $0.08/kWh, this represents $14,400–$33,600 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 totale eigendomskosten voor stikstofcompressie is reduced by an estimated 22–32% over a 10-year operational life.

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 and pressure rating requires coalescing filters, activated carbon adsorbers, and continuous oil monitoring instrumentation that collectively consume 3–5% of the compressor’s power output. The LW-60/8’s oil-free design removes this parasitic load entirely, further improving effective system efficiency.

Mogelijkheden voor maatwerk en OEM-productie

We offer extensive customization options to adapt the LW-60/8 to specific site conditions, integration requirements, and end-user specifications:

• Kant-en-klare pakketten op een frame: The compressor, motor, intercooler, aftercooler, instrumentation, and control panel are pre-assembled on a structural steel skid with integrated lifting lugs and anchor bolt templates. This approach reduces field installation time by approximately 60% and minimizes commissioning risks through comprehensive factory pre-testing of all systems.
• Configuraties van gevaarlijke zones: Motor- en elektrische behuizingen die voldoen aan de ATEX Zone 2- en IECEx-normen zijn beschikbaar voor installaties in petrochemische installaties waar incidenteel explosieve atmosferen kunnen voorkomen. Geïntegreerde gasdetectie en automatische ventilatievergrendelingen kunnen in het besturingssysteem worden opgenomen.
• Geavanceerde procesbesturing: Optioneel verkrijgbaar: Siemens S7-1200 of Allen-Bradley CompactLogix PLC met 10-inch HMI-touchscreen, bewaking op afstand via Modbus TCP/IP of OPC-UA, en naadloze integratie met DCS/SCADA-systemen van de fabriek. Automatische laad-/losregeling en compatibiliteit met frequentieomvormers (VFD's) optimaliseren de efficiëntie bij deellast en verminderen mechanische slijtage tijdens het opstarten.
• Milieubeschermingssystemen: C5-M marine-grade coating systems for coastal or offshore installations; tropicalized electrical components for ambient temperatures up to 55°C; and IP54-rated acoustic enclosures that reduce noise emission from 85 dB(A) to 72 dB(A) at 1 meter, suitable for indoor installations without dedicated compressor houses.
• OEM- en private labelprogramma's: Aangepaste lakkleuren, naamplaatjes met logo en lokale documentatiepakketten zijn beschikbaar voor distributeurs van gasapparatuur en systeemintegratoren. Technische handleidingen, onderdelenlijsten en onderhoudsprocedures kunnen in meerdere talen worden geleverd.

Aangepaste configuraties zijn beschikbaar via Minimale bestelhoeveelheid: 1 stukDe technische beoordeling en het opstellen van een voorstel duren doorgaans 5-7 werkdagen. De standaard levertijd is 12-14 weken; herhaalbestellingen worden binnen 8-10 weken na orderbevestiging geleverd.

Case Study: Petrochemical Complex Nitrogen Distribution Overhaul

Cliënt: A major petrochemical complex in the Middle East with three ethylene crackers, two polyethylene plants, and a polypropylene unit

Uitdaging: The complex’s nitrogen supply was provided by three aging oil-lubricated compressors (two European brands, one Asian brand, 16–22 years in service) feeding a common 0.60 MPa distribution header. The compressors were experiencing progressive oil carryover into the nitrogen stream, contaminating catalyst beds in the ethylene crackers and causing polymerization issues in the polyethylene reactors. Maintenance costs had escalated to $120,000/year, and the 0.60 MPa pressure was insufficient for new high-pressure reactor inerting requirements. The complex required a minimum 55 m³/min at 0.80 MPa to meet expanded production targets.

Oplossing: Wij leverden een LW-60/8 oil-free nitrogen compressor as the new primary compressor, configured on a custom skid with integrated intercooler, aftercooler, and a Siemens S7-1200 PLC control panel with full SCADA integration. The 0.80 MPa discharge pressure met all new high-pressure inerting requirements, while the oil-free design eliminated contamination of catalyst beds and polymerization reactors. A 10 m³ surge vessel was installed upstream to buffer demand fluctuations from the multiple process units. The two existing compressors were retained as backup units.

Gekwantificeerde resultaten na 24 maanden:

• Stikstofgehalte van de olie: Reduced from 5.8 mg/m³ to <0.01 mg/m³, waarbij de ISO 8573-1 Klasse 0-certificering is behaald.
• Catalyst bed replacement frequency: Extended from 18 months to 48 months, saving $180,000/year in catalyst costs
• Polymerization reactor contamination events: Volledig geëlimineerd, improving on-spec production by 2.1%
• Jaarlijkse onderhoudskosten: Verminderd met 48% ($120,000 to $62,400) through elimination of oil-related repairs
• Energieverbruik: Verbeterd door 8.2% versus the primary replaced unit, saving approximately $24,800/year
• Ongeplande downtime: Nul gebeurtenissen in 24 maanden ononderbroken bedrijf

“The LW-60/8 has completely transformed our nitrogen reliability. The elimination of oil contamination has extended our catalyst life by 2.5× and eliminated reactor contamination events. Our maintenance team has been redeployed to proactive tasks instead of constant oil-related repairs. The payback period was under 16 months.” — Hoofd operationele zaken, petrochemisch complex

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