Product Overview: LW Series Nitrogen and Oxygen Compressors
The LW series nitrogen and oxygen compressor is a horizontal opposed-balance two-column reciprocating piston compressor for large-capacity nitrogen (N₂), oxygen (O₂), and argon (Ar) compression in air separation downstream systems, industrial gas pipeline networks, large-volume cylinder filling stations, and chemical plant inert atmosphere supply. The LW series nitrogen and oxygen compressor covers 30–300 m³/h of gas flow at suction conditions with discharge pressures from 3.0 MPa to 30.0 MPa in multi-stage configurations, driven by motors from 30 kW to 500 kW. The LW series nitrogen and oxygen compressor occupies the highest-capacity tier of the nitrogen and oxygen compressor product range, handling the duties that exceed the practical capacity of the smaller L-type ZW series.
The defining engineering feature of the LW series nitrogen and oxygen compressor is the horizontal opposed-balance frame. Two cylinder columns are mounted horizontally at 180 degrees to each other on a common crankcase, so that pistons in the two columns move in opposite directions simultaneously. At any crank angle, the inertia force generated by the piston and connecting rod assembly in one column is equal and opposite to the inertia force from the opposing column — primary inertia forces cancel completely at source, and the net alternating force transmitted to the foundation and connected pipework is near zero throughout the operating cycle. This is the same opposed-balance principle used in the DW series refrigerant compressor, applied in the LW series nitrogen and oxygen compressor to nitrogen and oxygen service at high discharge pressures. In large air separation plant installations where the LW series nitrogen and oxygen compressor is connected by rigid steel pipework to nitrogen and oxygen product headers, inter-stage separators, and high-pressure cylinder filling manifolds, near-zero machine vibration is not merely convenient — it is the engineering basis for long service life of the pipework system without progressive fatigue at flanges and valve connections.
The LW series nitrogen and oxygen compressor is offered in lubricated cylinder configuration for nitrogen and argon service, and in oil-free cylinder configuration for oxygen service. The oil-free design uses PTFE self-lubricating piston rings and a labyrinth distance piece that physically separates the crankcase oil from the cylinder compression space, satisfying the requirements of GOST 12.2.052 for oxygen compression equipment at pressures above 0.05 MPa. All models are GOST-R certified and manufactured at our production facility in Russia, with full Russian-language documentation, pressure vessel certification for inter-stage coolers and separators, and oxygen equipment certification where applicable.
Technical Specifications — LW Series Nitrogen and Oxygen Compressor: Standard Nitrogen Range
LW series nitrogen and oxygen compressor models for nitrogen and argon compression from atmospheric suction to medium and high-pressure discharge. Opposed-balance horizontal frame; lubricated cylinders; cast iron or alloy steel piston rings; mineral oil. All models direct-coupled to standard or medium-voltage motors at 490 or 740 rpm.
| Model |
Stages |
Flow (m³/h) |
Suction (MPa) |
Discharge (MPa) |
Speed (rpm) |
Power (kW) |
Voltage |
| LW-30/0.1~15 |
3 |
30 |
0.10 |
15.0 |
740 |
30 |
380 |
| LW-50/0.1~15 |
3 |
50 |
0.10 |
15.0 |
740 |
55 |
380 |
| LW-80/0.1~15 |
3 |
80 |
0.10 |
15.0 |
740 |
90 |
380/6K |
| LW-120/0.1~15 |
3 |
120 |
0.10 |
15.0 |
490 |
132 |
380/6K |
| LW-160/0.1~15 |
3 |
160 |
0.10 |
15.0 |
490 |
185 |
380/6K |
| LW-200/0.1~20 |
3 |
200 |
0.10 |
20.0 |
490 |
280 |
6K/10K |
| LW-300/0.1~20 |
3 |
300 |
0.10 |
20.0 |
490 |
400 |
6K/10K |
Flow rated at suction (atmospheric) conditions, m³/h free gas. Horizontal opposed-balance two-column frame standard on all LW series models. 380 V for motors up to 185 kW; 6 kV or 10 kV for 280 kW and above. Nitrogen and argon service: lubricated cylinders with cast iron piston rings.
Technical Specifications — LW Series Nitrogen and Oxygen Compressor: Oxygen and High-Pressure Range
Oil-free cylinder models for large-capacity oxygen compression and four-stage high-pressure nitrogen models for 30 MPa cylinder filling. Oil-free PTFE piston rings and labyrinth distance piece on all oxygen variants; oxygen-cleaned materials throughout.
| Model |
Gas |
Stages |
Flow (m³/h) |
Suction (MPa) |
Discharge (MPa) |
Power (kW) |
Cylinder Type |
| LW-30/0.1~15(O₂) |
O₂ |
3 |
30 |
0.10 |
15.0 |
30 |
Oil-Free PTFE |
| LW-60/0.1~15(O₂) |
O₂ |
3 |
60 |
0.10 |
15.0 |
75 |
Oil-Free PTFE |
| LW-100/0.1~15(O₂) |
O₂ |
3 |
100 |
0.10 |
15.0 |
132 |
Oil-Free PTFE |
| LW-150/0.1~15(O₂) |
O₂ |
3 |
150 |
0.10 |
15.0 |
185 |
Oil-Free PTFE |
| LW-50/0.1~30 |
N₂ |
4 |
50 |
0.10 |
30.0 |
75 |
Lubricated CI |
| LW-100/0.1~30 |
N₂ |
4 |
100 |
0.10 |
30.0 |
160 |
Lubricated CI |
| LW-200/0.1~30 |
N₂ |
4 |
200 |
0.10 |
30.0 |
315 |
Lubricated CI |
O₂ models: oil-free PTFE piston rings; labyrinth distance piece; no hydrocarbon lubricant in oxygen contact; oxygen-degreased materials. N₂ 30 MPa models: 4-stage compression; forged alloy steel final-stage cylinder. CI = cast iron piston rings. All flows at atmospheric suction conditions, m³/h free gas.
General Series Parameters — LW Series Nitrogen and Oxygen Compressor
| Parameter |
LW Series Nitrogen and Oxygen Compressor |
| Gas Media |
Nitrogen (N₂); oxygen (O₂); argon (Ar) |
| Suction Pressure |
0.10 MPa (atmospheric) to 3.0 MPa (booster configurations) |
| Discharge Pressure |
3.0 MPa to 30.0 MPa (model-dependent) |
| Volume Flow |
30–300 m³/h at suction conditions |
| Motor Power |
30–500 kW |
| Drive Voltage |
380 V (30–185 kW); 380 V / 6 kV / 10 kV (280 kW and above) |
| Frame Type |
Horizontal opposed-balance two-column — primary inertia forces cancelled |
| Number of Stages |
3 stages (standard) or 4 stages (30 MPa models) |
| Cylinder Lubrication — N₂ / Ar |
Conventional; cast iron piston rings; mineral oil lubrication |
| Cylinder Lubrication — O₂ |
Oil-free; PTFE self-lubricating piston rings; labyrinth distance piece |
| Cooling |
Shell-and-tube water-cooled inter-stage coolers and after-cooler; moisture knock-out separators at each stage |
| Design Standard |
GOST-R; pressure vessels per GOST R 52857; oxygen equipment per GOST 12.2.052 |
| Certification |
ISO 9001:2015, GOST-R, Pressure Vessel License, Oxygen Equipment Certificate (O₂ models) |
LW Series Nitrogen and Oxygen Compressor: Working Principle
The LW series nitrogen and oxygen compressor operates on the opposed-balance multi-stage reciprocating compression principle. The LW series nitrogen and oxygen compressor uses two horizontal cylinders at 180 degrees on a shared crankcase to achieve complete primary force cancellation. Two cylinder columns are mounted horizontally on opposite sides of a common crankcase, each driven by a throw of the crankshaft positioned at 180 degrees to the other. As the piston in one column moves toward its cylinder head on the compression stroke, the piston in the opposing column moves away from its head on the suction stroke. The primary inertia forces generated by the two piston-connecting-rod assemblies are equal in magnitude and opposite in direction at every crank angle, cancelling completely within the machine frame. The net alternating force transmitted to the foundation bolts and to the connected gas pipework is near zero throughout the cycle — the opposed-balance LW series nitrogen and oxygen compressor achieves the same near-zero foundation force as the DW series refrigerant compressor and 4MW series refrigerant compressor, applied in the LW series to nitrogen and oxygen gas compression at high discharge pressures.
Gas passes through three or four compression stages in the LW series nitrogen and oxygen compressor, with inter-stage cooling between every stage. At the first stage, atmospheric-pressure nitrogen or oxygen enters the large-bore low-pressure cylinder through self-acting suction valves, is compressed to the first intermediate pressure, and is discharged through the first-stage valves into the inter-stage header. An inter-stage water-cooled shell-and-tube cooler removes the heat of compression, and a knock-out separator removes condensed moisture before the gas enters the second stage. This sequence repeats through the third stage (and fourth stage in 30 MPa models) until the gas reaches final discharge pressure. The gas then passes through an after-cooler and final moisture separator before entering the high-pressure distribution system. Inter-stage cooling is essential in the LW series nitrogen and oxygen compressor: it keeps cylinder discharge temperatures within the safe range for PTFE piston rings in oxygen models and mineral oil in nitrogen models, maximises volumetric efficiency at each subsequent stage, and ensures the delivered gas is dry and at near-ambient temperature at the outlet.
Opposed-Balance Frame — Near-Zero Foundation Force
Two horizontal cylinders at 180 degrees cancel primary inertia forces completely in the LW series nitrogen and oxygen compressor, which transmits near-zero alternating force to foundations and connected pipework — the critical requirement for machines installed in permanent air separation plant buildings connected by rigid N₂ and O₂ product pipework over service lives of 20–40 years.
Oil-Free Cylinders for O₂ — GOST 12.2.052 Compliant
PTFE self-lubricating piston rings eliminate hydrocarbon lubricant from all oxygen-wetted surfaces in LW series oxygen models. A labyrinth distance piece with atmospheric vent between crankcase and cylinder prevents oil migration by construction — not by periodic cleaning. This design meets the GOST 12.2.052 prohibition on hydrocarbon lubricants in oxygen equipment above 0.05 MPa.
Multi-Stage Inter-Stage Cooling
Shell-and-tube water-cooled inter-stage coolers and moisture separators between every LW series nitrogen and oxygen compressor compression stage, inter-stage cooling limits cylinder outlet temperatures, protects PTFE rings and mineral oil from thermal degradation, and ensures the delivered gas meets moisture specifications for both pipeline supply and cylinder filling.
High-Pressure Final Stage to 30 MPa
Four-stage LW series nitrogen and oxygen compressor models reach 30.0 MPa discharge pressure, the standard fill pressure for GOST 949 Type 1 seamless steel nitrogen cylinders. Forged alloy steel final-stage cylinder; stainless steel plate valves with precision-ground seat faces; hydraulically pressure-tested to 1.5 times maximum allowable working pressure before assembly.
LW Series Nitrogen and Oxygen Compressor: Application Scenarios
🏭Air Separation Plant — Large-Capacity N₂ and O₂ Product Compression
Large air separation units serving metallurgical complexes, chemical plants, and industrial gas distribution networks in Russia produce nitrogen and oxygen at low pressure from the distillation column overhead and liquid product vaporisers. The LW series nitrogen and oxygen compressor raises this low-pressure product gas to pipeline distribution or cylinder filling pressure (0.5–2.0 MPa) or cylinder filling pressure (15.0–30.0 MPa) in the capacity range of 100–300 m³/h that exceeds the practical envelope of the smaller ZW series L-type machines. The opposed-balance horizontal frame of the LW series nitrogen and oxygen compressor is the preferred configuration for air separation plant installations, where the compressor is permanently connected to nitrogen and oxygen product headers by rigid insulated steel pipework and must run continuously for 8,000–8,500 hours per year over 20–30 year plant lives. Near-zero machine vibration is the operational foundation for maintenance-free pipework systems over these extended service periods.
🏪Large-Volume Medical Oxygen Cylinder Filling Station
Regional medical oxygen supply centres in Russia supply oxygen to hospital networks, emergency services, and home care programmes by filling and distributing high-pressure medical oxygen cylinders. Large hospital networks or regional health systems require LW series nitrogen and oxygen compressor oxygen compression capacity of 60–150 m³/h at atmospheric suction to 15.0 MPa discharge — the capacity range covered by the LW series nitrogen and oxygen compressor LW-60/0.1~15(O₂) through LW-150/0.1~15(O₂) models. The oil-free PTFE cylinder design of LW series oxygen models produces compressed oxygen meeting GOST 6331 medical grade purity (99.5% minimum O₂, moisture and hydrocarbon limits) at the compressor outlet. The opposed-balance frame reduces vibration transmission to the concrete cylinder filling deck, where vibration propagation to high-pressure cylinder connections is a safety and quality concern.
⚙️Chemical and Petrochemical Plant — Large-Volume Nitrogen Supply
Large chemical plants producing polyethylene, polypropylene, methanol, or fertilisers in Russia consume nitrogen at high flow rates for reactor blanketing, transfer line pressurisation, purging between catalyst loads, and product handling inert atmosphere. A single LW series nitrogen and oxygen compressor in the 160 to 300 m³/h capacity range provides the continuous nitrogen supply duty for a large polymer or chemical production unit from a central liquid nitrogen vaporiser, distributing gas at 1.0–3.0 MPa to the process areas. The opposed-balance frame of the LW series nitrogen and oxygen compressor eliminates the vibration isolation problems that arise with L-type or single-column machines when the compressor is rigidly connected to large-diameter nitrogen supply headers in process plant piping systems where vibration transmission can excite connected vessel and column nozzles.
🔨High-Volume Nitrogen Cylinder Filling — 30 MPa Industrial Distribution
Industrial gas distributors serving major fabrication centres, shipyards, and large manufacturing complexes in Russia require nitrogen cylinder filling capacity at 30.0 MPa from a single machine in the 100–200 m³/h range — significantly above the capacity of the ZW series and well within the LW series nitrogen and oxygen compressor four-stage 30 MPa range. The LW series nitrogen and oxygen compressor LW-100/0.1~30 and LW-200/0.1~30 models serve these high-volume filling stations as the primary production compressor, filling multiple cylinders simultaneously from the high-pressure filling manifold. The opposed-balance frame is the preferred configuration for permanent cylinder filling station installations where compressor vibration at 30 MPa discharge excites the filling manifold and high-pressure hose connections, and where long service intervals between maintenance are required to minimise downtime impact on filling throughput.
LW Series Nitrogen and Oxygen Compressor: Core Advantages
⚖
Opposed-Balance — Long-Service Pipework Integrity
Primary inertia force cancellation in every LW series nitrogen and oxygen compressor reduces the dynamic load on every rigid pipework joint to near zero. Air separation plant nitrogen and oxygen product pipework systems connected to opposed-balance LW series machines run maintenance-free for 15–20 years between structural inspections, compared with 3–5 year inspection cycles required for non-balanced machines at equivalent capacity. This is the most significant long-term cost advantage of the LW series configuration in permanent plant installations.
☀
Oil-Free O₂ Cylinders — 15.0 MPa Oxygen-Safe Design
PTFE self-lubricating piston rings and labyrinth distance piece satisfy GOST 12.2.052 requirements in every LW series nitrogen and oxygen compressor oxygen model — by design, not by procedure. No reliance on periodic degreasing or oil-wash cycles to maintain safe oxygen service. Large-capacity oxygen compression at 60–150 m³/h with the same safety margin as smaller oil-free reciprocating oxygen compressors, in a single machine rather than multiple parallel units.
📈
30–300 m³/h — Large-Capacity Single Machine
The LW series nitrogen and oxygen compressor covers the capacity range where a single LW series nitrogen and oxygen compressor replaces two or three smaller ZW series units in parallel. A single LW series unit reduces the number of running items, eliminates the standby manifolding and switchover logic required for parallel smaller machines, and reduces the maintenance programme scope to a single crankcase, one set of valves, and one motor. For large air separation plant and medical oxygen supply duties, single-machine coverage from one LW series nitrogen and oxygen compressor is the lower total cost of ownership option.
📄
Full GOST-R and Oxygen Equipment Certification
Every LW series nitrogen and oxygen compressor delivered to Russia includes GOST-R certificate of conformity, technical passport, pressure vessel certification for all inter-stage and after-cooler vessels, and oxygen equipment certificate per GOST 12.2.052 for O₂ models — all as standard. Oxygen equipment in Russia requires specific certification under GOST 12.2.052 that imported compressors often lack at the time of delivery, leading to customs holds and commissioning delays that the LW series avoids.
🌎
Russia-Based Spare Parts — 24–72 Hour Dispatch
PTFE piston ring sets, cast iron ring sets, gas valve elements, piston rod packing, cylinder sleeve sets, and inter-stage cooler gaskets for all LW series nitrogen and oxygen compressor models are stocked at our Russian facility. Dispatch within 24–72 hours. For air separation plant nitrogen and oxygen product compressor duties that supply downstream process facilities, an unplanned compressor shutdown has immediate production cost implications — local spare parts availability is the system reliability foundation, not an option.
🕑
12–20 Week Delivery from Russia
Standard delivery from order placement to factory acceptance test for LW series nitrogen and oxygen compressor models is 12–20 weeks — faster than imported alternatives and without foreign currency exposure or customs risk. For air separation plant construction projects, medical oxygen infrastructure programmes, and chemical plant capacity expansions in Russia, a guaranteed domestic delivery within the construction schedule from a single Russian-manufactured LW series nitrogen and oxygen compressor unit is a project management advantage that imported equipment cannot match.
Material Specifications — LW Series Nitrogen and Oxygen Compressor: N₂ vs. O₂
All gas-contacting components in the LW series nitrogen and oxygen compressor are specified for the individual gas service of each order. The LW series nitrogen and oxygen compressor material table lists standard specifications for both nitrogen and oxygen service in the LW series nitrogen and oxygen compressor. The table below lists standard material specifications for both nitrogen and oxygen service across the LW series range.
| Component |
N₂ / Ar Service |
O₂ Service |
| Frame / Crankcase |
Cast iron HT250; standard manufacturing finish |
Same; no oil-contaminated surfaces in the gas path |
| Low-Pressure Cylinders |
Cast iron HT250; lubricated bore |
Cast iron or nodular iron; oxygen-degreased; oil-free bore |
| High-Pressure Cylinders |
Forged alloy steel 40CrMo; lubricated |
Forged stainless steel or alloy steel; oxygen-cleaned |
| Piston Rings |
Cast iron; oil-lubricated |
PTFE self-lubricating; no hydrocarbon oil in compression space |
| Distance Piece |
Standard; vented to atmosphere |
Labyrinth seal; atmospheric vent prevents crankcase oil migration to cylinder |
| Gas Valves |
Carbon steel or stainless steel; standard grade |
Stainless steel AISI 316; oxygen-degreased; zero hydrocarbon residue |
| Gaskets and Seals |
Nitrile or PTFE; lubricant-compatible |
PTFE or oxygen-compatible fluoroelastomer; no hydrocarbon-based seals |
| Crankcase Oil |
Mineral oil ISO VG 68 compressor grade |
No oil in compression space. Crankcase isolated by labyrinth distance piece. |
| Inter-Stage Pipework |
Carbon steel; standard industrial finish |
Stainless steel or carbon steel; oxygen-degreased; pickling and passivation standard |
LW Series Nitrogen and Oxygen Compressor vs. ZW Series and Alternative Types
Transparency Notice: Sauer, Bauer, and Kaeser are referenced for product category comparison only. We do not manufacture or claim affiliation with these brands. All LW series nitrogen and oxygen compressors are original designs manufactured at our Russian facility.
| Factor |
LW Series
Opposed-Balance |
ZW Series
L-Type |
Imported High-Pressure
(Sauer / Bauer) |
| Capacity range |
30–300 m³/h |
0.5–30 m³/h |
Varies; often smaller |
| Vibration at foundation |
Near zero (opposed-balance) |
Moderate (L-type partial balance) |
Varies by frame type |
| O₂ oil-free design |
✓ PTFE standard |
✓ PTFE standard |
Model-dependent |
| Max discharge pressure |
30.0 MPa |
30.0 MPa |
Up to 40 MPa |
| Capital cost |
Lowest; Russian manufacture |
Lower; Russian manufacture |
High (EUR / USD) |
| GOST-R O₂ certification |
✓ Included standard |
✓ Included standard |
Case by case; import delays |
| Russia spare parts |
In-house; 24–72 h |
In-house; 24–72 h |
Import; weeks |
| Lead time |
12–20 weeks |
8–16 weeks |
20–36 weeks |
Factory acceptance test — every LW series nitrogen and oxygen compressor unit is tested at rated suction and discharge conditions; opposed-balance vibration levels measured at main bearing housings on each LW series nitrogen and oxygen compressor; oxygen models verified for oil-free cylinder integrity; all safety devices calibrated and signed off before shipment from our Russian facility
FAQ — LW Series Nitrogen and Oxygen Compressor
Q1: What is the difference between the LW series and the ZW series nitrogen and oxygen compressor?
The ZW series uses an L-type two-column frame with one vertical and one horizontal cylinder at 90 degrees, which provides partial cancellation of primary inertia forces and covers the 0.5–30 m³/h capacity range at 7.5–250 kW. The LW series nitrogen and oxygen compressor uses a horizontal opposed-balance frame with both cylinders positioned horizontally at 180 degrees, which achieves complete primary force cancellation — the same principle as the DW series refrigerant compressor — and covers the larger 30–300 m³/h capacity range at 30–500 kW. For small-to-medium nitrogen and oxygen compression duties, the ZW series is the lower-cost option. For large-capacity duties in permanent air separation plant installations connected by rigid pipework to process headers, or for large oxygen cylinder filling stations where vibration at the high-pressure manifold is a concern, the LW series nitrogen and oxygen compressor opposed-balance frame is the engineering requirement.
Q2: Why does the opposed-balance frame of the LW series matter for air separation plant installations?
Air separation plants in Russia are designed for 20–30 year service lives. The nitrogen and oxygen product compressors run at continuous full load for 8,000–8,500 hours per year and are connected to the plant nitrogen and oxygen product headers, inter-stage separator vessels, and high-pressure cylinder filling manifolds by rigid insulated carbon steel pipework that is fixed to the building structure. In this configuration, any alternating force from the compressor is transmitted directly into the pipework system and its supports. Over decades of operation at 30–500 kW, even a small alternating force at each pipe flange progressively fatigues the gasket face and bolted joint. The opposed-balance LW series nitrogen and oxygen compressor transmits near-zero alternating force to the pipework — this is the primary technical justification for specifying the LW series nitrogen and oxygen compressor over L-type alternatives at large capacities — the primary inertia forces are cancelled internally. This is not a marginal improvement: it is the difference between pipework joints that require inspection every 3–5 years and joints that run maintenance-free for 15–20 years in a continuously operating gas plant.
Q3: How does the oil-free oxygen cylinder design work in the LW series?
In the LW series nitrogen and oxygen compressor oxygen variant, the cylinder compression space is oil-free at all times during operation. This is achieved through two design elements. First, all piston rings are manufactured from PTFE-filled composite material — PTFE is a solid lubricant that provides low-friction piston ring function without any liquid oil in the cylinder bore. Second, the distance piece — the housing between the cylinder and the crankcase — uses a labyrinth seal design with an atmospheric vent port. The labyrinth sealing geometry prevents crankcase oil vapour from migrating toward the cylinder along the piston rod, and the atmospheric vent removes any oil that does pass the first labyrinth stage before it can reach the second stage toward the cylinder. These two elements together ensure that the oxygen compression space is oil-free at all times by construction, not by periodic cleaning or operator procedure. This satisfies the GOST 12.2.052 requirement for oxygen equipment at pressures above 0.05 MPa.
Q4: What maintenance schedule applies to the LW series nitrogen and oxygen compressor?
Routine maintenance for the LW series nitrogen and oxygen compressor covers: crankcase oil and oil filter replacement every 2,000–3,000 operating hours; gas valve element inspection and replacement at 6,000–10,000 hours determined by condition inspection; PTFE piston ring inspection at 4,000–6,000 hours and replacement when wear exceeds the dimensional limit (oxygen models); cast iron piston ring inspection at 8,000–12,000 hours (nitrogen models); piston rod packing inspection and replacement at 8,000–10,000 hours; inter-stage cooler tube-side water flushing annually; and final-stage high-pressure connection torque re-check at 500-hour intervals for models operating above 15.0 MPa. The opposed-balance frame of every LW series nitrogen and oxygen compressor has inherently lower main bearing loads than non-balanced machines at the same power — primary inertia forces are internally cancelled, reducing the dynamic bearing load and extending crankshaft and bearing life between major overhauls.
Q5: Can the LW series nitrogen and oxygen compressor handle argon from air separation?
Yes. Argon is chemically inert and the LW series lubricated cylinder design is fully suitable for argon compression at all pressures within the LW series range. Argon has a molecular weight of 39.9 g/mol (versus 28.0 for nitrogen and 32.0 for oxygen) and a ratio of specific heats of 1.67 (versus 1.40 for nitrogen), which affects the adiabatic discharge temperature per stage and the required cylinder swept volume per unit of flow. The cylinder bore for argon service at the same rated m³/h flow differs from the equivalent nitrogen model, and a modified cylinder specification or bore is typically required. Specify argon purity, suction and discharge conditions, and required flow at enquiry. Our engineering team will advise on the appropriate LW series nitrogen and oxygen compressor configuration for the argon duty.
Q6: What GOST standards and documentation apply to the LW series oxygen models in Russia?
The primary Russian standards applicable to LW series oxygen compressor models are: GOST 12.2.052 (safety requirements for oxygen equipment — prohibits hydrocarbon lubricants in oxygen contact above 0.05 MPa, requires oxygen-degreased materials and assembly); GOST 6331 (medical oxygen quality — 99.5% minimum O₂, moisture and total hydrocarbon limits at the outlet); and GOST R 52857 (pressure vessel design and certification for inter-stage coolers and separators). Every LW series nitrogen and oxygen compressor oxygen model is delivered with a GOST-R certificate of conformity, technical passport, pressure vessel certification for all inter-stage vessels, oxygen equipment certificate per GOST 12.2.052, and Russian-language operating and maintenance documentation. Russian facilities operating oxygen compression equipment above certain capacity thresholds may also require Rostechnadzor registration under Federal Law 116-FZ — the documentation package is structured to support this registration directly.
Q7: What spare parts should be stocked on-site for an LW series nitrogen and oxygen compressor?
The recommended two-year on-site stock for an LW series nitrogen and oxygen compressor includes: one complete set of piston rings for all cylinder stages (PTFE rings for O₂ models, cast iron rings for N₂ models); one complete set of gas valve elements for all suction and discharge valve positions across all stages; one set of piston rod packing rings; crankcase oil for one complete change; oil filter elements for two changes; and final-stage high-pressure cylinder head sealing elements. For oxygen models, all replacement PTFE piston rings and valve elements must be stored in sealed, clean packaging and handled with oil-free gloves; replacement parts for oxygen service are supplied pre-degreased from our facility for immediate installation in oxygen service. Gas valve elements are the highest-priority on-site stock item for the LW series nitrogen and oxygen compressor. All LW series nitrogen and oxygen compressor spare parts are held in Russia for rapid dispatch. — valve failure is the most common in-service event causing loss of compression efficiency on the affected stage, and replacement requires 3–5 hours of planned work per stage position.
Q8: Is the LW series nitrogen and oxygen compressor available in a booster configuration?
Yes. The LW series nitrogen and oxygen compressor booster configuration is available for duties where suction pressure is above atmospheric — for example, boosting nitrogen from a 1.0 MPa plant header to 20.0 MPa for cylinder filling, or boosting oxygen from a 0.5 MPa PSA generator to 15.0 MPa. In an LW series booster configuration, the suction pressure at the first stage is higher than atmospheric, reducing the overall compression ratio and the number of stages required. The cylinder bore at each stage is resized for the specific suction and inter-stage pressure conditions. Booster configurations are common for air separation plant cylinder filling systems where the product gas header is already at 0.3–1.5 MPa from the ASU product compressor, and the filling station compressor only needs to raise the pressure from the header level to the cylinder fill pressure. Provide suction pressure, discharge pressure, gas type, and required flow at enquiry for an LW series nitrogen and oxygen compressor booster duty proposal.
Q9: How does the LW series compare to large centrifugal compressors for air separation plant N₂ and O₂ compression?
Large air separation plants above approximately 10,000 Nm³/h of nitrogen or oxygen production typically use centrifugal compressors for the main product compression duty because of the high flow rates involved. The LW series nitrogen and oxygen compressor is best suited to medium-scale air separation plants producing 500–5,000 Nm³/h of nitrogen or oxygen product, where the required product compression flow falls within the 30–300 m³/h capacity range of the LW series. At this scale, a single LW series nitrogen and oxygen compressor provides the full product compression duty in a capital cost and maintenance envelope that centrifugal equipment cannot match. The LW series reciprocating compressor also achieves higher efficiency (closer to isothermal compression with inter-stage cooling) at the high pressure ratios involved in nitrogen and oxygen cylinder filling compression from atmospheric to 15–30 MPa than centrifugal machines, which are limited to lower pressure ratios per stage and require more stages for cylinder filling duties.
Q10: What information is needed to obtain a proposal for an LW series nitrogen and oxygen compressor?
Standard LW series nitrogen and oxygen compressor delivery from order placement to factory acceptance test is 12–20 weeks. To obtain a technical and commercial proposal, provide: gas type (N₂, O₂, or Ar) and purity specification; suction pressure and temperature; required discharge pressure; required volume flow in m³/h at suction conditions or at standard conditions (0°C, 0.101325 MPa); continuous or intermittent duty; available electrical supply voltage (380 V, 6 kV, or 10 kV); site location; and whether GOST-R, oxygen equipment certificate, or Rostechnadzor registration documentation is required. For cylinder filling applications, also provide the cylinder working pressure, estimated filling rate in cylinders per hour, and the target buffer storage volume so our engineering team can size both the LW series nitrogen and oxygen compressor and the associated filling system. Response within 48 hours of your LW series nitrogen and oxygen compressor enquiry submission.
Request a Technical Proposal
Our engineering team supplies LW series nitrogen and oxygen compressors to air separation plant operators, medical gas supply organisations, industrial gas distributors, and chemical plant owners across Russia and the CIS. Every LW series nitrogen and oxygen compressor uses an opposed-balance frame for near-zero vibration in permanent plant installations; oil-free PTFE cylinders for large-capacity oxygen service; GOST 12.2.052 and GOST-R documentation included as standard. Spare parts manufactured in Russia, dispatched within 24–72 hours.
LW Series Nitrogen and Oxygen Compressor — Technical Enquiry
Discuss Your Large-Capacity N₂, O₂, or Ar Project
Gas compression engineers respond to all LW series nitrogen and oxygen compressor enquiries. GOST-R and oxygen equipment certification included. Response within 48 hours.
Request a Technical Quote
Include in Your LW Series Enquiry
✓ Gas type (N₂ / O₂ / Ar) and purity specification
✓ Required flow (m³/h at suction or standard conditions)
✓ Suction pressure and temperature
✓ Required discharge pressure (MPa)
✓ Continuous or intermittent duty cycle
✓ Available electrical supply voltage (380V / 6kV / 10kV)
✓ GOST-R / oxygen equipment certification required
✓ Cylinder filling: cylinder WP and required fill rate
✓ Required delivery and commissioning date
