Overview
The DF-0.45/(8-10)-250 CNG Compressor is a high-performance product from Bengbu United Compressor Manufacturing Co., Ltd., an enterprise restructured from the former Bengbu Compressor General Factory North Factory with over 50 years of design and manufacturing experience. Specialized in CNG boosting and transportation, this compressor serves as the "heart" of CNG filling stations, standing out for its reliable performance, safety, and adaptability.
Engineered to handle CNG with specific components (CH₄ 96%, CO₂ 3%, H₂S <21ppm, moisture content 500-1000ppm), it delivers a nominal volume flow of 0.45 m³/min (200 Nm³/h at 0.9MPa, with a design flow of 0.35 m³/min). With an inlet pressure of 0.8~1.0 MPa.G (design point: 0.9 MPa.G) and exhaust pressure of 25.0 MPa.G, it ensures stable CNG flow even in varying demand scenarios. Powered by a 45 kW explosion-proof three-phase asynchronous motor (model YBX3-280M-8), the unit balances power output and energy efficiency. Its compact skid-mounted structure (approximate dimensions: 5500×3200×2700 mm, weight: ~6T) facilitates flexible installation in CNG filling stations and natural gas-related industrial settings.
Beyond CNG filling station applications, this compressor supports diverse scenarios through its reliable gas handling capabilities: natural gas pipeline gas extraction, combustible gas recovery and canning, stirring in the pharmaceutical and brewing industries, pressurized gas transportation in the chemical industry, blow molding for bottle-making in the food industry, and parts dust removal in the machinery manufacturing industry. Its adaptability and high performance make it a reliable choice for both standard and specialized CNG handling needs.
Features
Advanced Structural Design
The DF-0.45/(8-10)-250 adopts a D-type symmetrical balanced structure, combined with natural air cooling for cylinders and forced air cooling for the whole machine, plus a low-oil lubrication design. This design prevents excessive compressor oil from entering the cylinder—equipped with a post-mounted high-efficiency oil remover, the gas oil content can be controlled at 8 ppm (0.5 lb/MMSCF, a world-recognized standard), ensuring the purity of processed CNG. The reciprocating piston mechanism with 2-row, 3-stage differential compression enhances compression efficiency, while the skid-mounted integration (all main and auxiliary equipment on a single base) simplifies on-site assembly and integration.
The crankcase, crafted from gray cast iron HT250, features interfaces for lubrication, oil drainage, and temperature monitoring, ensuring smooth operation and easy maintenance. The high-pressure cylinder surface uses ion nitriding technology to increase hardness, minimizing inner cavity wear; additionally, 各级 piston components are equipped with metal or engineering plastic guide rings and a plane self-aligning structure, ensuring precise linear motion of piston parts and reducing leakage.
High Efficiency and Reliability
Equipped with precision components made of high-quality materials (e.g., crankshaft: 45#, connecting rod: 40Cr, three/four-stage cylinders: 40Cr, piston rings/packing: PEEK), the compressor boasts high efficiency and strong operational stability. It has fewer wearing parts—key parts like piston rings, packing, and valves have a service life of no less than 6000 hours, while major components such as connecting rod bearings and crankshafts last no less than 30000 hours—lowering maintenance frequency and operational costs.
The automated control system (Siemens S7-200 PLC + Weinview 7-inch color touchscreen) reduces manual intervention, minimizing human error and improving workflow consistency. The unit’s external leakage rate is as low as 0.02%~0.03% of the gas supply volume (thanks to high-performance packing materials), and it uses large-diameter, low-speed fans for cooling to reduce noise, making it suitable for both industrial zones and areas with basic noise requirements. Whether operating at full load or variable conditions, the compressor maintains consistent performance, ensuring uninterrupted CNG supply.
Customizable Solutions
Recognizing diverse industrial needs, the DF-0.45/(8-10)-250 offers targeted customization. Customers can choose lubricating oil grades based on ambient temperature: L-DAB150 for temperatures above 5℃ and L-DAB100 for temperatures below 5℃, adapting to different climate conditions.
Drive and control adaptations are also available: the main motor supports soft start (via a soft starter) to avoid current impact, and the control cabinet reserves an RS485 communication interface with MODBUS-RTU protocol, enabling connection to the user’s DCS system for remote monitoring. Additionally, packaging and marking can be tailored—all outgoing documents, drawings, nameplates, and PLC interfaces can be customized with the user-specified company name and logo; equipment nameplates use 304 stainless steel with English marking (per user-provided drawings).
Patented Technology and Quality Construction
Bengbu United Compressor’s commitment to innovation is reflected in the compressor’s patented components, such as the piston rod thread protective sleeve (ZL 2017 2 1907021.7), piston ring support device (ZL 2018 2 0294776.2), and symmetrical balanced compressor range piston (ZL 2017 2 190177.0). These patents ensure superior performance and durability. The crankcase, crafted from high-grade gray cast iron, provides robust support for moving parts, while the double middle body structure prevents oil from entering the cylinder, maintaining medium purity.
Application Area
It is mainly used for boosting the pressure of natural gas to be integrated into the pipeline network for transportation (including gas extraction from natural gas pipelines and recovery of combustible gas for canning). It can also be applied in the following scenarios:
Agitation in the pharmaceutical and brewing industries;
Pressurized transportation of gases in the chemical industry;
Blow molding for bottle-making in the food industry;
Dust removal for parts in the machinery manufacturing industry.
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 |
The DF-0.45/(8-10)-250 CNG compressor adopts D-type (symmetrical balance type), air-cooled (cylinder natural cooling + whole machine forced air cooling), low-oil lubrication, reciprocating piston type, 2-row 3-stage differential compression, and the entire unit is supplied in a skid-mounted integrated manner (all main and auxiliary components installed on a shared base frame).
The compressor crankcase is made of gray cast iron HT250, which provides stable support for the transmission components. It is equipped with interfaces matching the crosshead guide, bearing, and bearing seat to ensure the accurate installation and operation of moving parts. The lower part of the crankcase can store lubricating oil, which is used for pressure lubrication of mechanical moving parts such as the crankshaft, connecting rod, and crosshead via a gear oil pump. The crankcase is also configured with multiple functional interfaces: an oil filler (breathing port) cover plate interface on the upper surface, an oil drain port, an oil level gauge observation port, a bearing seat oil injection port, and an oil temperature measurement port on the side. The oil drain port of the crankcase is connected to a centralized sewage tank inside the unit, and the external discharge of waste oil is realized through the user’s external pipeline connected to the sewage tank.
The compressor adopts a reasonable structural design to avoid medium contamination: the cylinder and packing use a low-oil lubrication structure, with a post-mounted high-efficiency oil remover to control the gas oil content at 8 ppm (0.5 lb/MMSCF, a world-recognized standard); meanwhile, the piston components of each stage are equipped with metal or engineering plastic guide rings and a plane self-aligning structure to ensure the precise linear motion of the piston rod, reducing the risk of lubricating oil entering the cylinder. The material of the compressor’s first and second-stage cylinders is ductile iron QT600-3, and the third and fourth-stage cylinders are made of 40Cr (with ion nitriding treatment on the surface to improve hardness and wear resistance); the cylinder head material is 40Cr. The air valves are made of high-quality stainless steel (valve seat: 3Cr13, valve plate: PEEK, spring plate: 3Cr13) and are arranged in a way that meets the gas flow requirements of the 3-stage compression process, ensuring smooth gas intake and exhaust.
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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
 |  |  |
| 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 | VF（D）-0.32/(30-200)-250 | Natural gas | 1500 | 25 | 75 | Air-cooled | 5538*2350*2438 | 9.5 |
| 2 | VF(D)-0.26/(30-200)-250 | Natural gas | 1000 | 25 | 55 | 5538*2350*2438 | 9.5 |
| 3 | ZFD-0. 1/(30-200)-250 | Natural gas | 500 | 25 | 37 | 6500*2350*2450 | 5.5 |
| 4 | DFD-3[0.28]/(2-4)[25-200]-250 | Natural gas | 1300 | 25 | 75 | 4050*3450*2100 | 12.5 |
| 5 | MF-4/(7-11)-250 | Natural gas | 1900-2880 | ~ | 355 | Air-cooled or
water-cooled | 6250*3200*3400 | 18 |
| 6 | DF-2/(10-15)-250 | Natural gas | 1320-1920 | ~ | 250 | 6000*3200*3400 | 16 |
| 7 | MF-3.2/(8-16)-250 | Natural gas | 1700-3260 | ~ | 355 | 6250*3200*3400 | 18 |
| 8 | MF-2.5/(14-25)-250 | Natural gas | 2250-3900 | ~ | 355 | 6450*3200*3400 | 20 |
| 9 | DF-1.55/(15-25)-250 | Natural gas | 1500-2400 | ~ | 280 | 600*3200*3400 | 16 |
| 10 | DF-1.45/(20-35)-250 | Natural gas | 1800-3100 | ~ | 280 | 6050*3200*3400 | 16 |
| 11 | MF-2/(20-30)-250 | Natural gas | 2500-3700 | ~ | 355 | 6250*3200*3400 | 20 |
| 12 | MF-1.8/(25-40)-250 | Natural gas | 2800-4400 | ~ | 355 | 6250*3200*3400 | 18 |
| 13 | MF-1.35/(30-45)-250 | Natural gas | 2500-3700 | ~ | 315 | 6000*3200*3400 | 18 |
| 14 | DF-1.3/(8-16)-250 | Natural gas | 700-1320 | ~ | 160 | 6000*3200*3400 | 18 |
| 15 | MF-1.5/(40-60)-250 | Natural gas | 3700-5500 | ~ | 355 | 6250*3200*3400 | 16 |
| 16 | MF-1.3/(50-85)-250 | Natural gas | 3900-6700 | ~ | 355 | 6250*3200*3400 | 18 |
| 17 | W-5.6/0.5-250 | Natural gas | 500 | 25 | 160 | Water-cooled | 5000*2300*2200 | 12 |
| 18 | DF-4.7/(1.5-2)-250 | Natural gas | 700-840 | 25 | 185 | Air-cooled | 6000*3200*3400 | 16 |
| 19 | W-3.6/(1.5-3)-250 | Natural gas | 540-860 | 25 | 160 | Water-cooled | 6200*2200*2200 | 12 |
| 20 | DF-3.85/(2-4)-250 | Natural gas | 690-1150 | 25 | 185 | Air-cooled or
water-cooled | 6000*3200*3400 | 16 |
| 21 | MF-5/(2-4)-250 | Natural gas | 900-1500 | 25 | 280 | 6250*3200*3400 | 18 |
| 22 | MF-7.2/(3-4)-250 | Natural gas | 1700-2160 | 25 | 355 | 6800*3200*3400 | 20 |
| 23 | DF-2.86/(2-6)-250 | Natural gas | 510~ 1200 | 25 | 185 | 6000*3200*3400 | 16 |
| 24 | MF-4/(5-8)-250 | Natural gas | 1400-2150 | 25 | 315 | 6250*3200*3400 | 18 |
| 25 | DF-1.95/(6-12)-250 | Natural gas | 820-1520 | 25 | 220 | 6000*3200*3400 | 16 |
| 26 | DF-1.6/(8-16)-250 | Natural gas | 860-1630 | 25 | 220 | 6000*3200*3400 | 16 |
| 27 | DF-0.58/(15-25)-250 | Natural gas | 550-900 | 25 | 90 | Air-cooled | 6000*3200*3400 | 16 |
Project Case
 |  |  |
| Zaozhuang CNG compressor project of Chengdu Shenliang Technology Co., Ltd. | Beijing Hongke Qingneng Technology Co., Ltd. associated gas compressor for Shanxi Yan'an 60000 m3 project | Lanzhou petrochemical company 240000 tonsyear ethylene production capacity restoration - adding butadiene and 1-butene unloading facilities project |
FAQ
What industries can benefit from the DF-0.45/(8-10)-250 CNG Compressor?
This compressor is versatile across sectors. It is primarily used for boosting and transporting pipeline natural gas but also excels in pharmaceutical and brewing stirring, chemical gas pressurization, food industry bottle blow molding, and machinery part dust removal. Its oil-free design makes it ideal for applications requiring high gas purity.
Can the compressor be customized for specific needs?
Yes. Bengbu United Compressor offers tailored solutions based on customer requirements, including flow rate (200 Nm³/h), pressure (inlet 0.8-1 MPa.G, discharge 25 MPa.G), operating environment, and intended use. Customizations include structural forms (D-type, M-type, S-type, etc.), cooling methods (water-cooled, air-cooled), installation types (fixed, mobile, skid-mounted), and drive modes (motor or diesel engine).
What cooling methods are available for this compressor?
The DF-0.45/(8-10)-250 uses a water-cooled system as standard, ensuring efficient heat dissipation during high-pressure operation. For sites with specific constraints, air-cooled and mixed cooling options are available, providing flexibility to match diverse environmental conditions.
