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Overview
The DFW-4.2 (0.2-1.5)-12 Special Gas Compressor is designed for BOG (Boil-Off Gas) recovery and compression in LNG storage, transportation and refueling systems.
It captures and compresses evaporated LNG gas generated during storage and operation, helping reduce gas loss and improve energy utilization efficiency.
BOG Recovery Capability
Designed specifically for low-pressure boil-off gas generated from LNG tanks and related facilities.
Clean Gas Compression
Oil-free compression design helps maintain gas purity and prevents oil contamination during operation.
LNG System Compatibility
Suitable for integration with LNG receiving stations, storage facilities and refueling systems.
Customized Project Solutions
Configuration options can be adapted according to different LNG process requirements and installation conditions.
Application Area
The DFW-4.2 (0.2-1.5)-12 Special Gas Compressor is widely used in:
LNG receiving terminals and storage facilities
LNG refueling stations and gas supply systems
BOG recovery and gas return systems
LNG process gas utilization projects
Highlight Advantages
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| Efficient BOG recovery reduces LNG loss during storage and operation. | Oil-free compression design ensures clean gas handling. | Compact skid-mounted structure simplifies installation in LNG facilities. | Stable performance supports continuous LNG gas management. |
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 DFW-4.2 (0.2-1.5)-12 Special Gas Compressor is designed with a D-type reciprocating structure and oil-free compression system for BOG handling.
The optimized compression chamber and sealing design support continuous recovery of low-pressure boil-off gas from LNG storage and transfer processes.
The skid-mounted package integrates the compressor and auxiliary systems, allowing efficient installation in LNG facilities.
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This compressor is designed as a customized solution based on specific project requirements, including gas parameters, operating conditions and installation needs.
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（G) | Motor power (kW) | Cooling method | Overall dimensions (mm) | Weights (kg) | |
| 1 | DWF-12.4/（9～12）-14 | Carbon dioxide | 6400 | 1.4 | 185 | Air-cooled | 6000×2700×2200 | 10000 | |
| 2 | VWF-2.86/5-16 | Nitrogen | 895 | 1.6 | 55 | Air-cooled | 3200×2200×1750 | 3500 | |
| 3 | ZWF-0.96/5 | Hydrogen chloride | 55 | 0.5 | 11 | Air-cooled | 2000×1500×2000 | 1000 | |
| 4 | DFW-1. 13/0.3-34 | Flash Vapour | 75 | 0.03～3.4 | 18.5 | Air-cooled | 4500×3200×2150 | 5600 | |
| 5 | DFW-6.5/(0～0.5)-10 | Associated gas | 50～100 | 1 | 75 | Air-cooled | 3500×2800×1850 | 4500 | |
| 6 | DFW-4.2/(0.2～1.5)-12 | BOG | 260～540 | 1.2 | 55 | Air-cooled | 3500×3000×2000 | 5500 | |
| 7 | DW-2.45/(6～7)-100 | Carbon Monoxide | 900 | 10 | 160 | Mixed cooling | 6500×3200×1700 | 10000 | |
| 8 | DW-19.8/0.5-7.25 | Methylene chloride | 3.5 | 0.725 | 160 | Mixed cooling | 5200×3000×2350 | 8000 | |
| 9 | DW-8.6/(0～0.2)-8 | Chloromethane | 436 | 0.8 | 75 | Mixed cooling | 3200×2400×1600 | 4500 | |
| 10 | DW-2.4/2.5-11 H | elium Recovery Ga | 450 | 1.1 | 37 | Mixed cooling | 3000×2500×1800 | 3000 | |
Project Case
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| Zaozhuang CNG compressor project of Chengdu Shenliang Technology Co., Ltd. | Alibek oilfield in Southern Kazakhstan | Beijing Hongke Qingneng Technology Co., Ltd. associated gas compressor for Shanxi Yan'an 60000 m3 project |
What is the purpose of a BOG compressor in LNG systems?
It is used to recover and compress boil-off gas generated during LNG storage and transfer, reducing gas waste and improving system efficiency.
Where can the DFW-4.2 (0.2-1.5)-12 be installed?
It is suitable for LNG terminals, storage facilities, refueling stations and other BOG recovery systems.
Can this compressor be designed for different LNG operating conditions?
Yes. The configuration can be adapted based on gas parameters, process conditions and site requirements.
What support is available for customized projects?
Bengbu United provides technical solutions, equipment design and project-specific documentation according to customer needs.
