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The DWF-4.1/(18~25)-45 reciprocating piston compressor is a medium-high pressure model for natural gas boosting in industrial gas processing and transportation, capable of stable pressurization during long-term continuous operation.
It features a nominal volumetric flow of 4.1m³/min with an actual gas handling capacity of 95,000–135,000 Nm³/h. Under normal temperature conditions, it operates with an inlet pressure range of 1.8~2.5MPa(G) and delivers a rated discharge pressure of 4.5MPa(G), driven by a 200kW motor rated at 740r/min.
The fully integrated skid-mounted unit measures 6200×2900×2300mm and weighs 14 tons, enabling easy on-site pipeline connection and consistent long-term operation.
This D-type symmetric balanced forced air-cooled oil-free reciprocating piston compressor adopts single-stage two-cylinder layout and is delivered as an integrated skid-mounted unit for medium-high pressure natural gas processing.
Stable Operation & High Safety: Matched forced air cooling restricts exhaust temperature below 125℃. Complete pressure lubrication safeguards all moving assemblies. Equipped with ExdIIBT4 explosion-proof motor, Siemens S7-1200 PLC and Weinview touch screen, it realizes real-time parameter monitoring and automatic fault alarm & shutdown, satisfying safety standards for natural gas hazardous working areas.
Easy Installation & Maintenance: High-rigidity integrated skid base cuts on-site construction work. Built-in manual turning device, matched wearing spares and dedicated maintenance tools effectively shorten equipment downtime.
Strong Environmental Adaptability:Adaptable to ambient temperature of -20℃~+45℃. Equipped with oil circuit heat preservation, electric tracing and low-temperature oil heater to sustain stable natural gas supply under severe temperature fluctuations.
Highlight Advantages
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| Has high efficiency, strong reliability, and high degree of automation; | Less vulnerable parts, low vibration, low noise, and easy operation and maintenance | The main and auxiliary equipment of the compressor are all installed on the sled, running smoothly and reliably. The overall sled installation is convenient for the transportation and installation of the compressor | The entire machine components are carefully designed |
Patent Certificates
 | A piston rod thread protective sleeve ZL 2017 2 1907021.7 | | A piston ring support device ZL 2018 2 0294776.2 | |
| A range piston ZL 2017 2 190177.0 for symmetrical balanced compressors | | Integrated long short double compartment ZL 2018 2 0294762.0 |
Whole Machine Description
The DWF-4.1/(18~25)-45 is a D-type balanced air-cooled oil-free reciprocating piston compressor with single-stage two-cylinder structure, supplied as an integrated skid-mounted unit. Foundation installation guarantees stable continuous operation for medium-high pressure natural gas compression.
Its HT250 split crankcase serves as an oil storage chamber equipped with a coarse filter, oil dipstick, oil filling port, drain valve and oil temperature detection ports to protect moving parts.
The HT250 double middle body isolates lubricant from compression chambers. Ductile iron oil-free cylinders and cylinder heads with axial valves avoid gas contamination, reduce flow resistance and improve compression efficiency.
A manual turning device facilitates pre-start and maintenance inspection. Shock-absorbing tire coupling connects the motor, matched with a fully enclosed spark-proof cover to satisfy explosion-proof requirements of natural gas working areas.
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The compressor in this picture is a non-standard product. The product provides independent solutions tailored to customers' specific usage requirements (flow rate/purity/pressure, usage environment, main purpose, and customer specific requirements), from design to product customization.
Structural form: D-type/M-type/S-type/W-type/V-type/Z-type
Cooling method: water cooling/air cooling/mixed cooling
Installation form: fixed/mobile/pry mounted/cabin type
Drive mode: motor drive/diesel engine start
Transportation: sea/air/land
Packaging:
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| Metal cabin | Wooden box | Soundproof cabin |
Project Case
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| Lanzhou petrochemical company 240000 tonsyear ethylene production capacity restoration - adding butadiene and 1-butene unloading facilities project | Alibek oilfield in Southern Kazakhstan | Procurement of Molecular Sieve Dehydration, Ethylene Glycol Regeneration and Injection Device, and Fuel Gas Skid in Akimom Gas Field |
Technical Parameter
| No. | Model | Medium | Flow rate (Nm3/h) | Exhaust pressure MPa | Motor power (kW) | Cooling method | Overall dimensions (mm) | Weights (kg) | |
| 1 | VW-3.5/1-18 | Natural gas | 420 | 1.8 | 55 | Closed water coole | d 4000×1800×2200 | 5000 | |
| 2 | DF-0.4/（2～6）-250 | Natural gas | 160 | 25 | 30 | Air-cooled | 2800×1800×1500 | 3500 | |
| 3 | DFD-1.36/(30～50)-250 | Natural gas | 4167 | 25 | 315 | Air-cooled | 8500×3700×4100 | 22000 | |
| 4 | DFW-3.7/(8～12)-52 | Natural gas | 2083 | 5.2 | 200 | Air-cooled | 6000×3400×2300 | 15000 | |
| 5 | DFW-5.3/3-15 | Natural gas | 1100 | 1.5 | 90 | Air-cooled | 6500×3000×2500 | 6000 | |
| 6 | DFWD-5.7/(0. 1～0.5)-40 | Natural gas | 75～365 | 4 | 90 | Air-cooled | 7000×3400×2500 | 100000 | |
| 7 | DFWD-5/(1.5～3.6)-14.2 | Natural gas | 700 | 1.42 | 90 | Air-cooled | 5000×3200×2200 | 6500 | |
| 8 | DW-9/3-35 | Natural gas | 2000 | 3.5 | 250 | Air-cooled | 4800×4000×2000 | 13000 | |
| 9 | MFWD-7/(10～30)-35 | Natural gas | 6250 | 3.5 | 315 | Air-cooled | 6300×3200×3200 | 16000 | |
| 10 | VF-1.4/(5～7)-250 | Natural gas | 500 | 25 | 110 | Air-cooled | 5000×2400×2100 | 6800 | |
This D-type oil-free compressor is only suitable for natural gas as specified in the technical agreement. It cannot compress hydrogen, oxygen or other special industrial gases. Contact us for customized units if other media compression is required to guarantee safe operation.
Replace oil and clean filters after 200 initial operating hours
Change lubricant twice yearly: L-DAB150 above 5℃, L-DAB100 below 5℃
Full inspection of seals, valves and transmitters every 3000–4000 hoursKey consumables last at least 6000 hours, and oil-free cylinders reduce frequent lubrication maintenance.
This skid-mounted gas compressor meets all standards listed in the technical agreement:
• Main unit: API 618-2007, SH/T 3143-2012, GB/T 3853-1998
• Pressure vessels: GB 150-2011, TSG R0004-2009, JB/T 4730 series
• ExdIIBT4 explosion-proof components: GB 3836 series
• Pipeline flanges: HG/T 20592-2009Full standard compliance guarantees safe operation in natural gas processing environments.
The 14-ton skid unit is 6200×2900×2300mm. Heavy truck transport is standard; sea or rail transport is negotiable based on project conditions.Packaging complies with GB/T 13384:
• Cover the whole skid with moisture-proof film and tarpaulin
• Add shock pads to protect core transmission parts
• Separate precision instruments and spare parts with foam packaging
• Attach standard shipping warning labels.
All services are performed as stipulated in the technical agreement:
Technicians guide on-site installation and commissioning after site condition check
Train operators on operation, maintenance and common fault troubleshooting
Complete set of wear parts supplied, with long-term original spare parts supply
Warranty: 12 months after commissioning or 18 months after delivery (whichever earlier). Free repair for manufacturing defects. 12-hour response, 24h on-site service within 500km, 48h within 1000km. Lifetime technical consultation available post-warranty.
