Gas composition (mol%): Flash gas (CH ₄ 45-49%, C ₂ - C ₁₀ hydrocarbons, CO ₂ 0.4-0.5%)
Flow rate: 420Nm ³/h @ 0.02MPa. G
Inlet pressure: 0.02~0.05MPa. G (design point 0.02MPa)
Inlet temperature: normal temperature
Exhaust pressure: 5.5MPa. G
Main motor power: 132kW
Overall dimensions of the machine: approximately 6800 × 3400 × 2750mm
Whole machine weight: approximately 14T
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The DWFD-6.7 / (0.2-0.5) -55 Special Gas Compressor, manufactured by Bengbu United Compressor, is a high-performance flash gas compressor engineered for efficient recovery and utilization of low-pressure associated gas in oil and gas fields, LNG plants, and environmental governance projects. Designed to handle specific medium compositions—CH₄ 45-49%, C₂-C₁₀ hydrocarbons, and CO₂ 0.4-0.5%—this compressor delivers exceptional reliability in demanding industrial settings.
With a processing capacity of 420Nm³/h @ 0.02MPa.G, it operates within an inlet pressure range of 0.02~0.05MPa.G (design point at 0.02MPa) and achieves an outlet pressure of 5.5MPa.G, powered by a 132kW main motor. Its compact dimensions (approximately 6800 × 3400 × 2750mm) and weight of 14T make it suitable for diverse installation environments, from mountainous regions in Sichuan-Chongqing to desert terrains.
Ideal for reducing flare emissions and ensuring VOCs emissions ≤ 3‰, this compressor plays a critical role in enhancing energy efficiency and environmental sustainability across oil and gas operations, LNG facilities, and pipeline boosting systems.
The DWFD-6.7 / (0.2-0.5) -55 Special Gas Compressor stands out for its high efficiency and robust reliability, minimizing energy consumption while maximizing operational uptime. Equipped with a low number of wear parts, it ensures reduced vibration and noise levels, simplifying maintenance routines and lowering long-term operational costs. Its advanced automation system further streamlines operations, reducing the need for constant manual oversight.
Built with a D-type symmetrical balanced design, the compressor features water-cooled, oil-free lubrication, and a reciprocating piston structure with 2 rows and 3 stages of compression—all supplied in a modular format for easy integration. The crankcase, crafted from gray cast iron, stores lubricating oil and includes strategic ports for oil drainage, temperature monitoring, and ventilation. A dual-intermediate body design prevents oil contamination of the medium, ensuring purity even in sensitive applications. Cylinders and cylinder heads, made from gray cast iron or forged steel, feature axially arranged valves for optimal gas flow.
Designed for versatility, the compressor supports multiple installation types: fixed, mobile, skid-mounted, or cabin-type. Its skid-mounted design integrates main and auxiliary equipment into a single unit, facilitating seamless transportation and on-site setup—ideal for remote locations. Customers can choose from various cooling methods (water-cooled, air-cooled, or mixed cooling) and drive modes (motor or diesel engine), ensuring alignment with specific project requirements. Packaging options include metal cabins, wooden boxes, or soundproof cabins, with transportation available via sea, air, or land.
Application Area
Flash gas compressors are specifically designed for efficient utilization of associated gas in oil and gas fields
Gas field development: recovering low-pressure flash gas (BOG) to improve recovery rate
Gathering and transmission system: providing power for boosting long-distance pipelines (suitable for mountainous/desert terrain in Sichuan and Chongqing)
LNG Plant: Operation of Alternative Fuel Gas Boosting Guarantee Device
Environmental governance: Reduce flare emissions and VOCs emissions ≤ 3 ‰
Highlight Advantages
 |  |  |  |
| 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 compressor adopts D-type (symmetrical balance type), water-cooled, oil-free lubrication, reciprocating piston type, 2-row 3-stage compression, and the entire unit is supplied in a modular manner.
The compressor crankcase is made of gray cast iron and has four holes of different diameters for installing crosshead slides, bearings, and bearing seats. The lower part of the crankcase can store lubricating oil for the compressor to lubricate; The upper surface of the crankcase has an interface for installing a fuel inlet (breathing port) cover plate; In addition, the crankcase also has spare interfaces such as oil drain port, oil gauge observation port, bearing seat oil injection port, and installation oil temperature measurement port. The oil drain port of the crankcase has been connected to the outside of the compartment and is equipped with a manual ball valve for oil discharge from the crankcase.
The middle body of the compressor is a double middle body structure, ensuring that the middle body space is greater than one stroke, preventing compressor oil from entering the cylinder from the crankcase, thus ensuring that compressor oil does not contaminate the medium. The material of the compressor cylinder is gray cast iron/forged steel, and it adopts an oil-free lubrication design, which does not require oil lubrication. The cylinder head material is gray cast iron/forged steel, and the air valves are arranged axially on the cylinder head.
 |  |
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:
 |  |  |
| Metal cabin | Wooden box | Soundproof cabin |
Project Case
 |  |  |
| 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 | |
| 11 | DW-14/(0～0.2)-25 | Raw material gas | 800 | 2.5 | 160 | Water-cooled | 4800×3200×1915 | 10000 | |
| 12 | VW-8/18 | Vinylidene fluoride | 418 | 1.8 | 75 | Water-cooled | 3700×2000×1700 | 4500 | |
| 13 | VWD-3.2/(0～0.2)-40 | Biogas | 230 | 4.0 | 45 | Water-cooled | 6000×2500×2650 | 8000 | |
| 14 | VW-9/6 | Ethyl chloride | 470 | 0.6 | 55 | Water-cooled | 2800×1720×1700 | 3500 | |
| 15 | DW-2.4/(18～25)-50 | Raw material gas | 2900 | 5.0 | 160 | Water-cooled | 4300×3000×1540 | 4500 | |
| 16 | VW-5.6/（0～6）-6 | Isobutylene | 1650 | 0.6 | 45 | Water-cooled | 2900×1900×1600 | 3500 | |
| 17 | VW-3.8/3.5 | Mixed gases | 200 | 0.35 | 18.5 | Water-cooled | 2200×1945×1600 | 2000 | |
| 18 | ZW-1.7/3.5 | Vinyl chloride | 100 | 0.35 | 15 | Water-cooled | 2700×1600×2068 | 2000 | |
| 19 | VW-0.85/(0～14)-40 | Refrigerant | 300 | 4.0 | 55 | Water-cooled | 4500×2300×1780 | 5500 | |
| 20 | DW-3.78/(8～13)-(16～24) | Ammonia | 2700 | 1.6～2.4 | 75 | Water-cooled | 3200×2000×1700 | 3500 | |
| 21 | DW-5/7 | Chloromethane | 355 | 0.7 | 37 | Water-cooled | 3500×2600×1700 | 4000 | |
| 22 | DW-9.2/3 | on-condensable gas | 653 | 0.3 | 45 | Water-cooled | 3500×3200×1680 | 6800 | |
| 23 | DW- 16/(2.8～3.2)-7.6 | Carbon rich gas | 3000～3400 | 0.76 | 132 | Water-cooled | 4500×3400×2750 | 12000 | |
| 24 | DWD-2.9/20-50 | Wellhead gas | 3334 | 2.0～5.0 | 185 | Water-cooled | 6000×3500×3000 | 14000 | |
| 25 | DW-4/0.5-4 | -pentadiene, nitroge | 300 | 0.4 | 30 | Water-cooled | 3000×2800×1700 | 3500 | |
| 26 | DW-8.7/0.02-15 | Tail gas | 500 | 1.5 | 90 | Water-cooled | 4500×3000×1800 | 10000 | |
| 27 | DW-8.8/0.2-6 | Desorption gas | 450 | 0.6 | 75 | Water-cooled | 4000×3000×2150 | 8000 | |
| 28 | DW-1.3/0.2-18 | Metafluoroethylene | 80 | 1.8 | 18.5 | Water-cooled | 3500×2500×1570 | 3500 | |
| 29 | DW-12.5/(0. 1～0. 15)-18 | uoromonochloroeth | 887 | 1.8 | 132 | Water-cooled | 5500×3200×2500 | 14000 | |
| 30 | DW-2.9/5 | Gas | 206 | 0.5 | 22 | Water-cooled | 3200×2800×1800 | 3000 | |
Project Case
 |  |  |
| Lanzhou petrochemical company 240000 tonsyear ethylene production capacity restoration - adding butadiene and 1-butene unloading facilities project | Beijing Hongke Qingneng Technology Co., Ltd. associated gas compressor for Shanxi Yan'an 60000 m3 project | Zaozhuang CNG compressor project of Chengdu Shenliang Technology Co., Ltd. |
It is specifically engineered for flash gas with a composition of CH₄ 45-49%, C₂-C₁₀ hydrocarbons, and CO₂ 0.4-0.5%—making it ideal for recovering low-pressure flash gas (BOG) in oil and gas fields, LNG plants, and environmental 治理 projects.
Yes. Bengbu United Compressor offers tailored solutions based on specific requirements, including flow rate, purity, pressure, operating environment, and purpose. Customizable options include structural forms (D-type, M-type, S-type, W-type, V-type, Z-type), cooling methods, installation types, and drive modes.
The compressor reduces flare emissions and limits VOCs emissions to ≤ 3‰, supporting compliance with strict environmental regulations. It enhances resource utilization by recovering otherwise wasted flash gas, making it a sustainable choice for eco-conscious projects.
The DWFD-6.7 / (0.2-0.5) -55 Special Gas Compressor, manufactured by Bengbu United Compressor, is a high-performance flash gas compressor engineered for efficient recovery and utilization of low-pressure associated gas in oil and gas fields, LNG plants, and environmental governance projects. Designed to handle specific medium compositions—CH₄ 45-49%, C₂-C₁₀ hydrocarbons, and CO₂ 0.4-0.5%—this compressor delivers exceptional reliability in demanding industrial settings.
With a processing capacity of 420Nm³/h @ 0.02MPa.G, it operates within an inlet pressure range of 0.02~0.05MPa.G (design point at 0.02MPa) and achieves an outlet pressure of 5.5MPa.G, powered by a 132kW main motor. Its compact dimensions (approximately 6800 × 3400 × 2750mm) and weight of 14T make it suitable for diverse installation environments, from mountainous regions in Sichuan-Chongqing to desert terrains.
Ideal for reducing flare emissions and ensuring VOCs emissions ≤ 3‰, this compressor plays a critical role in enhancing energy efficiency and environmental sustainability across oil and gas operations, LNG facilities, and pipeline boosting systems.
The DWFD-6.7 / (0.2-0.5) -55 Special Gas Compressor stands out for its high efficiency and robust reliability, minimizing energy consumption while maximizing operational uptime. Equipped with a low number of wear parts, it ensures reduced vibration and noise levels, simplifying maintenance routines and lowering long-term operational costs. Its advanced automation system further streamlines operations, reducing the need for constant manual oversight.
Built with a D-type symmetrical balanced design, the compressor features water-cooled, oil-free lubrication, and a reciprocating piston structure with 2 rows and 3 stages of compression—all supplied in a modular format for easy integration. The crankcase, crafted from gray cast iron, stores lubricating oil and includes strategic ports for oil drainage, temperature monitoring, and ventilation. A dual-intermediate body design prevents oil contamination of the medium, ensuring purity even in sensitive applications. Cylinders and cylinder heads, made from gray cast iron or forged steel, feature axially arranged valves for optimal gas flow.
Designed for versatility, the compressor supports multiple installation types: fixed, mobile, skid-mounted, or cabin-type. Its skid-mounted design integrates main and auxiliary equipment into a single unit, facilitating seamless transportation and on-site setup—ideal for remote locations. Customers can choose from various cooling methods (water-cooled, air-cooled, or mixed cooling) and drive modes (motor or diesel engine), ensuring alignment with specific project requirements. Packaging options include metal cabins, wooden boxes, or soundproof cabins, with transportation available via sea, air, or land.
Application Area
Flash gas compressors are specifically designed for efficient utilization of associated gas in oil and gas fields
Gas field development: recovering low-pressure flash gas (BOG) to improve recovery rate
Gathering and transmission system: providing power for boosting long-distance pipelines (suitable for mountainous/desert terrain in Sichuan and Chongqing)
LNG Plant: Operation of Alternative Fuel Gas Boosting Guarantee Device
Environmental governance: Reduce flare emissions and VOCs emissions ≤ 3 ‰
Highlight Advantages
| | | |
| 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 compressor adopts D-type (symmetrical balance type), water-cooled, oil-free lubrication, reciprocating piston type, 2-row 3-stage compression, and the entire unit is supplied in a modular manner.
The compressor crankcase is made of gray cast iron and has four holes of different diameters for installing crosshead slides, bearings, and bearing seats. The lower part of the crankcase can store lubricating oil for the compressor to lubricate; The upper surface of the crankcase has an interface for installing a fuel inlet (breathing port) cover plate; In addition, the crankcase also has spare interfaces such as oil drain port, oil gauge observation port, bearing seat oil injection port, and installation oil temperature measurement port. The oil drain port of the crankcase has been connected to the outside of the compartment and is equipped with a manual ball valve for oil discharge from the crankcase.
The middle body of the compressor is a double middle body structure, ensuring that the middle body space is greater than one stroke, preventing compressor oil from entering the cylinder from the crankcase, thus ensuring that compressor oil does not contaminate the medium. The material of the compressor cylinder is gray cast iron/forged steel, and it adopts an oil-free lubrication design, which does not require oil lubrication. The cylinder head material is gray cast iron/forged steel, and the air valves are arranged axially on the cylinder head.
| |
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:
| | |
| Metal cabin | Wooden box | Soundproof cabin |
Project Case
| | |
| 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 | |
| 11 | DW-14/(0～0.2)-25 | Raw material gas | 800 | 2.5 | 160 | Water-cooled | 4800×3200×1915 | 10000 | |
| 12 | VW-8/18 | Vinylidene fluoride | 418 | 1.8 | 75 | Water-cooled | 3700×2000×1700 | 4500 | |
| 13 | VWD-3.2/(0～0.2)-40 | Biogas | 230 | 4.0 | 45 | Water-cooled | 6000×2500×2650 | 8000 | |
| 14 | VW-9/6 | Ethyl chloride | 470 | 0.6 | 55 | Water-cooled | 2800×1720×1700 | 3500 | |
| 15 | DW-2.4/(18～25)-50 | Raw material gas | 2900 | 5.0 | 160 | Water-cooled | 4300×3000×1540 | 4500 | |
| 16 | VW-5.6/（0～6）-6 | Isobutylene | 1650 | 0.6 | 45 | Water-cooled | 2900×1900×1600 | 3500 | |
| 17 | VW-3.8/3.5 | Mixed gases | 200 | 0.35 | 18.5 | Water-cooled | 2200×1945×1600 | 2000 | |
| 18 | ZW-1.7/3.5 | Vinyl chloride | 100 | 0.35 | 15 | Water-cooled | 2700×1600×2068 | 2000 | |
| 19 | VW-0.85/(0～14)-40 | Refrigerant | 300 | 4.0 | 55 | Water-cooled | 4500×2300×1780 | 5500 | |
| 20 | DW-3.78/(8～13)-(16～24) | Ammonia | 2700 | 1.6～2.4 | 75 | Water-cooled | 3200×2000×1700 | 3500 | |
| 21 | DW-5/7 | Chloromethane | 355 | 0.7 | 37 | Water-cooled | 3500×2600×1700 | 4000 | |
| 22 | DW-9.2/3 | on-condensable gas | 653 | 0.3 | 45 | Water-cooled | 3500×3200×1680 | 6800 | |
| 23 | DW- 16/(2.8～3.2)-7.6 | Carbon rich gas | 3000～3400 | 0.76 | 132 | Water-cooled | 4500×3400×2750 | 12000 | |
| 24 | DWD-2.9/20-50 | Wellhead gas | 3334 | 2.0～5.0 | 185 | Water-cooled | 6000×3500×3000 | 14000 | |
| 25 | DW-4/0.5-4 | -pentadiene, nitroge | 300 | 0.4 | 30 | Water-cooled | 3000×2800×1700 | 3500 | |
| 26 | DW-8.7/0.02-15 | Tail gas | 500 | 1.5 | 90 | Water-cooled | 4500×3000×1800 | 10000 | |
| 27 | DW-8.8/0.2-6 | Desorption gas | 450 | 0.6 | 75 | Water-cooled | 4000×3000×2150 | 8000 | |
| 28 | DW-1.3/0.2-18 | Metafluoroethylene | 80 | 1.8 | 18.5 | Water-cooled | 3500×2500×1570 | 3500 | |
| 29 | DW-12.5/(0. 1～0. 15)-18 | uoromonochloroeth | 887 | 1.8 | 132 | Water-cooled | 5500×3200×2500 | 14000 | |
| 30 | DW-2.9/5 | Gas | 206 | 0.5 | 22 | Water-cooled | 3200×2800×1800 | 3000 | |
Project Case
| | |
| Lanzhou petrochemical company 240000 tonsyear ethylene production capacity restoration - adding butadiene and 1-butene unloading facilities project | Beijing Hongke Qingneng Technology Co., Ltd. associated gas compressor for Shanxi Yan'an 60000 m3 project | Zaozhuang CNG compressor project of Chengdu Shenliang Technology Co., Ltd. |
It is specifically engineered for flash gas with a composition of CH₄ 45-49%, C₂-C₁₀ hydrocarbons, and CO₂ 0.4-0.5%—making it ideal for recovering low-pressure flash gas (BOG) in oil and gas fields, LNG plants, and environmental 治理 projects.
Yes. Bengbu United Compressor offers tailored solutions based on specific requirements, including flow rate, purity, pressure, operating environment, and purpose. Customizable options include structural forms (D-type, M-type, S-type, W-type, V-type, Z-type), cooling methods, installation types, and drive modes.
The compressor reduces flare emissions and limits VOCs emissions to ≤ 3‰, supporting compliance with strict environmental regulations. It enhances resource utilization by recovering otherwise wasted flash gas, making it a sustainable choice for eco-conscious projects.
