Product Overview: DW Series Nitrogen and Oxygen Compressor
The DW series nitrogen and oxygen compressor is a horizontal opposed-balance two-column reciprocating piston compressor for nitrogen (N₂), oxygen (O₂), and argon (Ar) compression in medium-to-large industrial gas applications. It covers 10–100 m³/h at suction conditions with discharge pressures from 5.0 MPa to 20.0 MPa in 12 standard models at 15–200 kW, bridging the capacity gap between the smaller L-type ZW series and the larger LW series in the nitrogen and oxygen compressor product range. It serves air separation plant product gas boost duties, industrial nitrogen pipeline distribution, medium-volume cylinder filling stations, and chemical plant inert gas supply where the opposed-balance frame is required for low-vibration operation in permanently piped installations.
The opposed-balance frame of the DW series nitrogen and oxygen compressor places two cylinder columns horizontally at 180 degrees on a common crankcase. Pistons in the two opposing columns move in exactly opposite directions at every crank angle, so their primary inertia forces cancel completely. The net alternating dynamic force transmitted to the foundation and connected pipework is near zero — the same mechanical principle that makes the DW series refrigerant compressor the preferred choice for large cold storage installations is applied in the DW series nitrogen and oxygen compressor to N₂, O₂, and Ar compression at medium capacity. In air separation plant installations where the DW series nitrogen and oxygen compressor connects to nitrogen and oxygen product headers via rigid steel pipework, near-zero machine vibration is the basis for long-service maintenance-free pipework joints over plant service lives of 20 years or more.
For oxygen service, the DW series nitrogen and oxygen compressor is available with oil-free cylinders: PTFE self-lubricating piston rings eliminate hydrocarbon lubricant from the oxygen compression space, and a labyrinth distance piece with atmospheric vent prevents crankcase oil from migrating to the cylinder. This design satisfies GOST 12.2.052 requirements for oxygen equipment above 0.05 MPa. Nitrogen and argon models use conventional lubricated cylinders with cast iron piston rings and standard mineral oil — both gas types are chemically inert and impose no restriction on standard cylinder lubricants. All DW series nitrogen and oxygen compressor models are GOST-R certified and manufactured at our Russian production facility.
Technical Specifications — DW Series Nitrogen and Oxygen Compressor: Nitrogen Range
DW series nitrogen and oxygen compressor models for nitrogen and argon service from atmospheric suction. Opposed-balance horizontal frame; lubricated cylinders; cast iron piston rings; mineral oil. All models 740 rpm direct-coupled to standard or medium-voltage motors.
| Model |
Stages |
Flow (m³/h) |
Suction (MPa) |
Discharge (MPa) |
Speed (rpm) |
Power (kW) |
Voltage |
| DW-10/0.1~10 |
2 |
10 |
0.10 |
10.0 |
740 |
15 |
380 |
| DW-20/0.1~10 |
2 |
20 |
0.10 |
10.0 |
740 |
22 |
380 |
| DW-30/0.1~15 |
3 |
30 |
0.10 |
15.0 |
740 |
37 |
380 |
| DW-50/0.1~15 |
3 |
50 |
0.10 |
15.0 |
740 |
55 |
380 |
| DW-70/0.1~15 |
3 |
70 |
0.10 |
15.0 |
740 |
75 |
380/6K |
| DW-100/0.1~20 |
3 |
100 |
0.10 |
20.0 |
740 |
132 |
380/6K |
Flow at suction (atmospheric) conditions, m³/h free gas. All models horizontal opposed-balance two-column frame, 740 rpm. 380 V for motors up to 75 kW; 380 V / 6 kV for 132 kW and above. Nitrogen and argon: lubricated cast iron ring cylinders.
Technical Specifications — DW Series Nitrogen and Oxygen Compressor: Oxygen Range
Oil-free cylinder DW series nitrogen and oxygen compressor models for oxygen service. PTFE piston rings; labyrinth distance piece; oxygen-degreased materials. All O₂ models satisfy GOST 12.2.052 requirements for oxygen compression equipment.
| Model |
Gas |
Stages |
Flow (m³/h) |
Suction (MPa) |
Discharge (MPa) |
Power (kW) |
Cylinder Type |
| DW-10/0.1~10(O₂) |
O₂ |
2 |
10 |
0.10 |
10.0 |
15 |
Oil-Free PTFE |
| DW-20/0.1~10(O₂) |
O₂ |
2 |
20 |
0.10 |
10.0 |
22 |
Oil-Free PTFE |
| DW-30/0.1~15(O₂) |
O₂ |
3 |
30 |
0.10 |
15.0 |
37 |
Oil-Free PTFE |
| DW-50/0.1~15(O₂) |
O₂ |
3 |
50 |
0.10 |
15.0 |
55 |
Oil-Free PTFE |
| DW-70/0.1~15(O₂) |
O₂ |
3 |
70 |
0.10 |
15.0 |
90 |
Oil-Free PTFE |
| DW-100/0.1~15(O₂) |
O₂ |
3 |
100 |
0.10 |
15.0 |
132 |
Oil-Free PTFE |
O₂ models: oil-free PTFE piston rings; labyrinth distance piece with atmospheric vent; no hydrocarbon lubricant in oxygen contact; oxygen-degreased all wetted parts. All flows at atmospheric suction, m³/h free gas.
General Series Parameters — DW Series Nitrogen and Oxygen Compressor
| Parameter |
DW Series Nitrogen and Oxygen Compressor |
| Gas Media |
N₂ (nitrogen); O₂ (oxygen); Ar (argon) |
| Volume Flow |
10–100 m³/h at suction conditions |
| Discharge Pressure |
5.0–20.0 MPa |
| Motor Power |
15–200 kW |
| Drive Voltage |
380 V (15–75 kW); 380 V / 6 kV (90 kW and above) |
| Frame Type |
Horizontal opposed-balance two-column — primary inertia forces cancelled at source |
| Number of Stages |
2 stages (10 MPa models); 3 stages (15–20 MPa models) |
| Cylinder Lubrication — N₂ / Ar |
Lubricated; cast iron piston rings; mineral oil |
| Cylinder Lubrication — O₂ |
Oil-free; PTFE piston rings; labyrinth distance piece with vent |
| Cooling |
Water-cooled inter-stage coolers and after-cooler; knock-out moisture separators |
| 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) |
DW Series Nitrogen and Oxygen Compressor: Working Principle
The DW series nitrogen and oxygen compressor operates on the opposed-balance multi-stage reciprocating compression principle. Two horizontal cylinders are mounted at 180 degrees on a common crankcase. As one piston compresses gas on the forward stroke, the opposing piston completes its suction stroke, and the two primary inertia forces cancel exactly within the machine frame. The net alternating force at the foundation and connected pipework is near zero throughout the cycle. Gas passes through two or three compression stages with water-cooled inter-stage cooling and moisture separation between every stage before reaching final discharge pressure. In the DW series nitrogen and oxygen compressor oxygen models, all compression space components are oil-free by design: PTFE piston rings require no liquid lubricant, and the labyrinth distance piece prevents crankcase oil from reaching the cylinder. This satisfies GOST 12.2.052 for oxygen equipment without reliance on periodic degreasing procedures.
Opposed-Balance Frame
Two horizontal cylinders at 180 degrees cancel primary inertia forces completely in the DW series nitrogen and oxygen compressor. Near-zero foundation and pipework force throughout the cycle. The essential design feature for medium-capacity N₂ and O₂ compression in permanently piped process plant installations.
Oil-Free O₂ Cylinder
PTFE piston rings and labyrinth distance piece keep all oxygen-wetted compression space surfaces hydrocarbon-free. Meets GOST 12.2.052 by design. No periodic degreasing required — the DW series nitrogen and oxygen compressor oxygen variant is inherently oil-free at all operating conditions.
Inter-Stage Cooling
Shell-and-tube water-cooled inter-stage coolers and knock-out separators between each compression stage remove heat and moisture before the next stage. The DW series nitrogen and oxygen compressor delivers gas at near-ambient temperature and below the moisture specification at the outlet, ready for pipeline distribution or cylinder filling.
2–3 Stage Multi-Pressure Range
Two-stage models in the DW series nitrogen and oxygen compressor reach 10 MPa; three-stage models reach 15–20 MPa. The modular stage arrangement allows the DW series nitrogen and oxygen compressor to serve both medium-pressure pipeline supply (5–10 MPa) and high-pressure cylinder filling (15–20 MPa) in the same product family.
Application Scenarios — DW Series Nitrogen and Oxygen Compressor
🏭Air Separation Plant — Medium-Capacity N₂ and O₂ Product Boost
Medium air separation units producing 200–2,000 Nm³/h of nitrogen or oxygen product deliver gas at low pressure from the distillation section. The DW series nitrogen and oxygen compressor raises this product gas to pipeline pressure (0.5–2.0 MPa) or cylinder filling pressure (10.0–20.0 MPa) in the 10–100 m³/h flow range that falls between the ZW series and LW series capacity tiers. Russian metallurgical, petrochemical, and electronics facilities operating medium air separation units specify the DW series nitrogen and oxygen compressor for product gas compression where the opposed-balance frame provides the near-zero vibration required for long-service pipework integrity in permanently installed gas plant.
🏪Medical Oxygen Cylinder Filling — Regional Distribution Stations
Regional medical oxygen supply stations serving district hospitals and emergency services in Russia require oxygen compression in the 20–50 m³/h range at 10.0–15.0 MPa — the capacity covered by DW-20/0.1~10(O₂) through DW-50/0.1~15(O₂) models in the DW series nitrogen and oxygen compressor range. The oil-free PTFE cylinder design produces oxygen meeting GOST 6331 medical grade purity at the compressor outlet. A single DW series nitrogen and oxygen compressor oxygen model at this capacity fills a district-level hospital supply requirement from a standard liquid oxygen vaporiser without parallel machines or secondary booster units.
⚙️Chemical and Electronics Plant — Nitrogen Inert Atmosphere Supply
Medium-scale chemical plants, pharmaceutical manufacturers, and electronics fabrication facilities in Russia consume nitrogen at 0.5–5.0 MPa for blanketing, purging, and process atmosphere control. A DW series nitrogen and oxygen compressor in the 30–70 m³/h range covers the continuous nitrogen supply duty for these facilities from a liquid nitrogen vaporiser to the process distribution header. The opposed-balance frame of the DW series nitrogen and oxygen compressor is the appropriate choice when the compressor connects directly to process pipework in a clean or chemical plant environment where vibration transmission to process vessels and instrument connections is unacceptable.
🔨Nitrogen Cylinder Filling — Medium-Volume Industrial Station
Industrial gas distributors serving welding supply shops, fabrication workshops, and food packaging facilities require nitrogen cylinder filling at 15.0–20.0 MPa in the 30–100 m³/h flow range — medium-volume stations where the ZW series is at the top of its capacity range and the full LW series would be oversized. The DW series nitrogen and oxygen compressor DW-30/0.1~15 through DW-100/0.1~20 three-stage nitrogen models serve these medium-volume filling stations as a single opposed-balance machine, providing the low-vibration performance needed for permanent installation on a cylinder filling deck where the high-pressure filling manifold is rigidly connected to the compressor discharge.
DW Series Nitrogen and Oxygen Compressor: Core Advantages
⚖
Opposed-Balance at Medium Capacity
The DW series nitrogen and oxygen compressor delivers complete primary force cancellation at 15–200 kW — the medium-capacity range where L-type ZW series machines provide only partial balance and the larger LW series is oversized for the duty. Near-zero foundation vibration in a compact opposed-balance machine sized for 10–100 m³/h is the specific engineering value of the DW series nitrogen and oxygen compressor in the product family.
☀
Oil-Free O₂ Cylinder — GOST 12.2.052
PTFE piston rings and labyrinth distance piece keep the oxygen compression space hydrocarbon-free at all times. The DW series nitrogen and oxygen compressor oxygen variant satisfies GOST 12.2.052 by design for safe oxygen compression to 15 MPa without periodic degreasing or procedural controls. Full oxygen equipment certification supplied as standard for Russian delivery.
📈
N₂, O₂, Ar — Common Frame
The DW series nitrogen and oxygen compressor crankcase, crankshaft, and running gear components are identical across nitrogen, oxygen, and argon variants. Facilities operating both N₂ and O₂ DW series nitrogen and oxygen compressor units share spare parts for all running gear components and require a single operator training programme for both machines.
📄
Full GOST-R Documentation
Every DW series nitrogen and oxygen compressor delivery to Russia includes GOST-R certificate, technical passport, pressure vessel certification for all inter-stage vessels, and oxygen equipment certificate per GOST 12.2.052 for O₂ models — all as standard without additional cost or certification delays at the border.
🌎
Russia Spare Parts — 24–72 Hour Dispatch
PTFE piston ring sets, cast iron ring sets, gas valve elements, piston rod packing, and inter-stage cooler gaskets for all DW series nitrogen and oxygen compressor models are stocked at our Russian facility. Dispatch within 24–72 hours. For medical oxygen supply and air separation plant duties, local parts availability determines the maintenance response time that protects downstream supply commitments.
🕑
10–16 Week Delivery
Standard delivery from order placement to factory acceptance test for DW series nitrogen and oxygen compressor models is 10–16 weeks from our Russian facility — faster than imported alternatives at comparable specification. No foreign currency exposure; no customs delays; full Russian-language documentation at handover.
DW Series Nitrogen and Oxygen Compressor vs. ZW and LW Series
Transparency Notice: Sauer and Bauer are referenced for category comparison only. We do not manufacture or claim affiliation with these brands. All DW series nitrogen and oxygen compressor models are original Russian designs.
| Factor |
ZW Series
L-Type |
DW Series
Opposed-Balance |
LW Series
Opposed-Balance |
Imported
(Sauer / Bauer) |
| Capacity range |
0.5–30 m³/h |
10–100 m³/h |
30–300 m³/h |
Varies |
| Vibration balance |
Partial (L-type) |
Full (opposed) |
Full (opposed) |
Model-dependent |
| Max discharge |
30 MPa |
20 MPa |
30 MPa |
Up to 40 MPa |
| O₂ oil-free design |
✓ PTFE |
✓ PTFE |
✓ PTFE |
Model-dependent |
| Capital cost |
Lowest |
Low; Russia |
Low; Russia |
High (EUR) |
| GOST-R / O₂ cert |
✓ Standard |
✓ Standard |
✓ Standard |
Case by case |
| Lead time |
8–16 wks |
10–16 wks |
12–20 wks |
20–36 wks |
Factory acceptance test — every DW series nitrogen and oxygen compressor is tested at rated conditions before shipment; vibration measured at bearing housings; oxygen models verified for oil-free cylinder integrity; all safety devices calibrated
FAQ — DW Series Nitrogen and Oxygen Compressor
Q1: How does the DW series nitrogen and oxygen compressor differ from the ZW and LW series?
The ZW series is an L-type two-column machine at 0.5–30 m³/h with partial primary force balance. The DW series nitrogen and oxygen compressor is a horizontal opposed-balance two-column machine at 10–100 m³/h with complete primary force cancellation — the same opposed-balance principle as the LW series but at medium capacity (15–200 kW versus 30–500 kW for the LW). The DW series fills the capacity tier where a ZW series machine is too small for the duty and the full LW series would be oversized. It is the first choice for medium-capacity N₂ and O₂ compression duties requiring opposed-balance low-vibration performance in permanently piped process plant installations.
Q2: Why must the oxygen models use oil-free PTFE cylinders?
High-pressure oxygen in contact with hydrocarbon lubricating oil is a deflagration hazard. The adiabatic temperature at the end of the compression stroke at 10–15 MPa is sufficient to ignite oil vapour in the presence of high-concentration oxygen. GOST 12.2.052 prohibits hydrocarbon lubricants in oxygen equipment above 0.05 MPa for this reason. The DW series nitrogen and oxygen compressor oxygen variant uses PTFE piston rings — a solid lubricant requiring no liquid oil in the cylinder — and a labyrinth distance piece that prevents crankcase oil from reaching the compression space, making the design inherently safe for oxygen service without reliance on periodic cleaning procedures.
Q3: Can the DW series nitrogen and oxygen compressor handle argon?
Yes. Argon is inert and the DW series nitrogen and oxygen compressor lubricated cylinder design is fully compatible with argon service at all pressures within the range. Argon has a higher molecular weight (39.9 g/mol) and different specific heat ratio than nitrogen, which affects cylinder sizing. Provide argon suction and discharge conditions and required flow at enquiry and our engineering team will advise whether a standard DW series nitrogen and oxygen compressor nitrogen model or a modified cylinder bore specification is required.
Q4: What GOST documentation comes with the DW series nitrogen and oxygen compressor?
Every DW series nitrogen and oxygen compressor delivered to Russia includes: GOST-R certificate of conformity; technical passport with all rated operating parameters; pressure vessel certification for inter-stage coolers and separators per GOST R 52857; oxygen equipment certificate per GOST 12.2.052 for O₂ models; factory acceptance test report with signed performance and vibration data; and Russian-language operating and maintenance documentation. The documentation set is structured to support Rostechnadzor registration under Federal Law 116-FZ where required for oxygen facilities above the exemption threshold.
Q5: What maintenance does the DW series nitrogen and oxygen compressor require?
Routine maintenance for the DW series nitrogen and oxygen compressor: crankcase oil and filter replacement every 2,000–3,000 hours; gas valve element inspection and replacement at 6,000–10,000 hours; PTFE piston ring inspection at 4,000–6,000 hours for O₂ models; cast iron ring inspection at 8,000–12,000 hours for N₂ models; piston rod packing inspection at 6,000–8,000 hours; and inter-stage cooler annual water-side flushing. The opposed-balance frame reduces main bearing dynamic loads by cancelling primary inertia forces, extending crankshaft and bearing service life between overhauls compared with non-balanced machines at equivalent capacity. For oxygen models, all replacement cylinder components must be handled oil-free and stored in sealed packaging.
Q6: What information is needed for a DW series nitrogen and oxygen compressor proposal?
Standard delivery from order placement to factory acceptance test for the DW series nitrogen and oxygen compressor is 10–16 weeks. To obtain a proposal, provide: gas type (N₂, O₂, or Ar) and purity specification; suction pressure and temperature; required discharge pressure; required flow at suction or standard conditions; available electrical supply voltage; site location; and whether GOST-R and oxygen equipment certification is required. For cylinder filling applications, also provide cylinder working pressure and required filling rate. Response within 48 hours.
Request a Technical Proposal
Our engineering team supplies DW series nitrogen and oxygen compressors to air separation plant operators, medical gas distributors, industrial gas filling stations, and chemical plants across Russia and the CIS. Opposed-balance frame for near-zero vibration at medium capacity; oil-free PTFE cylinders for oxygen service; GOST-R and GOST 12.2.052 documentation included. Spare parts from Russia, dispatched within 24–72 hours.
DW Series Nitrogen and Oxygen Compressor — Technical Enquiry
Discuss Your N₂, O₂, or Ar Medium-Capacity Project
Gas compression engineers respond to all DW series nitrogen and oxygen compressor enquiries. GOST-R and oxygen equipment certification included. Response within 48 hours.
Request a Technical Quote
Include in Your DW Series Enquiry
✓ Gas type (N₂ / O₂ / Ar) and purity
✓ Required flow (m³/h at suction or standard conditions)
✓ Suction pressure and temperature
✓ Required discharge pressure (MPa)
✓ Available electrical supply voltage
✓ GOST-R / oxygen equipment certification required
✓ Cylinder filling: cylinder WP and fill rate
✓ Required delivery date
