Description
DF-0.45/(8-10)-250 CNG Compressor
High-Pressure CNG & Natural Gas Compression System
The DF-0.45/(8-10)-250 CNG Compressor is a high-pressure reciprocating compressor designed for CNG filling stations, natural gas boosting, gas recovery, pipeline applications, and industrial gas compression systems.
The compressor is engineered for natural gas with a typical composition of approximately 96% CH₄, 3% CO₂, H₂S below 21 ppm, and moisture content of 500–1000 ppm. It provides a nominal volume flow of 0.45 m³/min, equivalent to approximately 200 Nm³/h at 0.9 MPa, with a design flow of 0.35 m³/min.
With an inlet pressure range of 0.8–1.0 MPa.G and a design inlet pressure of 0.9 MPa.G, the compressor can deliver compressed gas at an exhaust pressure of up to 25.0 MPa.G.
The system is powered by a 45 kW explosion-proof three-phase asynchronous motor, model YBX3-280M-8, and is supplied in a compact skid-mounted configuration for convenient installation and integration into CNG and natural gas facilities.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | DF-0.45/(8-10)-250 |
| Application | CNG / Natural Gas Compression |
| Gas Composition | CH₄ approx. 96%, CO₂ approx. 3% |
| H₂S Content | <21 ppm |
| Moisture Content | 500–1000 ppm |
| Nominal Volume Flow | 0.45 m³/min |
| Nominal Capacity | Approx. 200 Nm³/h at 0.9 MPa |
| Design Flow | 0.35 m³/min |
| Inlet Pressure | 0.8–1.0 MPa.G |
| Design Inlet Pressure | 0.9 MPa.G |
| Exhaust Pressure | 25.0 MPa.G |
| Motor Power | 45 kW |
| Motor Type | Explosion-Proof, Three-Phase Asynchronous |
| Motor Model | YBX3-280M-8 |
| Compressor Structure | D-Type Symmetrical Balanced |
| Compression Configuration | 3-Stage Differential Compression |
| Cooling | Natural Cylinder Cooling + Forced Air Cooling |
| Installation | Skid-Mounted |
| Approx. Dimensions | 5500 × 3200 × 2700 mm |
| Approx. Weight | 6 Tonnes |
Advanced D-Type Compressor Structure
The DF-0.45/(8-10)-250 incorporates a D-type symmetrical balanced reciprocating structure designed to support stable operation and efficient high-pressure compression.
The balanced configuration helps distribute reciprocating forces within the compressor and contributes to reduced vibration during operation.
The compressor incorporates:
- D-type symmetrical balanced construction
- Reciprocating piston compression
- Three-stage differential compression
- Low-oil lubrication system
- Natural air cooling for cylinders
- Forced air cooling for the complete compressor
- Integrated skid-mounted equipment arrangement
Oil-Controlled Compression & Gas Purity
The compressor utilizes a low-oil lubrication configuration designed to minimize oil carryover into the compression cylinders.
A high-efficiency post-mounted oil separator is incorporated to help control oil content in the compressed gas. Under the specified operating conditions, the gas oil content can be controlled to approximately 8 ppm according to the supplied technical specifications.
This configuration makes the compressor suitable for CNG and natural gas applications where control of lubricant carryover is important.
Three-Stage Compression
The three-stage differential compression arrangement allows the gas pressure to be increased progressively through multiple compression stages.
The system is designed for operation from an inlet pressure of approximately 0.8–1.0 MPa.G to a maximum exhaust pressure of 25.0 MPa.G.
Multi-stage compression provides controlled pressure increases and can help manage discharge temperatures and compression loads during high-pressure operation.
Durable Mechanical Construction
The compressor crankcase is manufactured from HT250 gray cast iron, providing a robust foundation for the crankshaft and reciprocating components.
The crankcase includes provisions for:
- Lubrication
- Oil drainage
- Temperature monitoring
- Maintenance access
High-pressure cylinder surfaces utilize ion nitriding treatment to increase surface hardness and reduce internal wear.
The piston assemblies incorporate metal or engineering-plastic guide rings and self-aligning arrangements to support accurate piston movement and help reduce leakage.
High-Quality Compressor Components
The supplied configuration specifies selected materials for key components, including:
- Crankshaft: 45#
- Connecting Rod: 40Cr
- Cylinder Components: 40Cr
- Piston Rings: PEEK
- Packing: PEEK
These components are selected for their suitability for reciprocating high-pressure compressor operation.
Service Life of Wear Components
The compressor is designed to reduce maintenance requirements through durable wear components.
According to the supplied specifications:
- Piston rings, packing, and valves: ≥6,000 operating hours
- Connecting rod bearings and crankshaft: ≥30,000 operating hours
Actual component life can vary depending on gas composition, operating pressure, temperature, duty cycle, lubrication, maintenance, and operating conditions.
Automated PLC Control
The DF-0.45/(8-10)-250 can be equipped with a Siemens S7-200 PLC and 7-inch Weinview colour touchscreen for compressor monitoring and control.
The automated control system can help manage key operating parameters and compressor protection functions while reducing the need for continuous manual intervention.
Possible monitoring and control functions include:
- Pressure monitoring
- Temperature monitoring
- Compressor status
- Cooling system monitoring
- Lubrication monitoring
- Alarm indication
- Shutdown protection
- Operating condition monitoring
DCS & Remote Monitoring Integration
For industrial installations requiring centralized plant monitoring, the control cabinet can provide an RS485 communication interface with MODBUS-RTU protocol.
This enables integration with a customer’s DCS or supervisory control system, subject to the final project control architecture.
The interface can be used to exchange selected compressor operating parameters and status information with the plant control system.
Explosion-Proof Motor
The compressor is driven by a 45 kW explosion-proof three-phase asynchronous motor, model YBX3-280M-8.
The explosion-proof motor configuration is suitable for applications where electrical equipment must be appropriately selected for potentially hazardous gas environments.
A soft-start arrangement can also be incorporated to help reduce starting-current impact during motor startup.
Cooling & Noise Management
The compressor uses a combination of natural air cooling for the cylinders and forced-air cooling for the complete machine.
Large-diameter, low-speed cooling fans can provide the required airflow while helping to limit operating noise.
This configuration can be suitable for industrial facilities where both thermal management and equipment noise are important considerations.
Skid-Mounted Configuration
The main and auxiliary equipment can be integrated onto a single skid base, providing a compact and organized compressor package.
The skid-mounted design offers:
- Simplified transportation
- Reduced site assembly
- Faster equipment installation
- Compact equipment layout
- Integrated auxiliary equipment
- Simplified piping and connection work
- Convenient project integration
The approximate overall package dimensions are 5500 × 3200 × 2700 mm, with an approximate weight of 6 tonnes.
Actual dimensions and weight may vary depending on the final equipment configuration and project-specific accessories.
Applications
CNG Filling Stations
The DF-0.45/(8-10)-250 can be integrated into CNG filling station compression systems for increasing natural gas pressure for storage and downstream dispensing applications.
Natural Gas Pipeline Systems
The compressor can be used in selected applications requiring natural gas boosting, pipeline gas extraction, and pressure enhancement, subject to the process requirements.
Combustible Gas Recovery
The system can be used for recovery and compression of combustible gases for storage, transfer, or further processing.
Pharmaceutical & Brewing Industries
Compressed gas systems can be applied to selected agitation and process-gas requirements within pharmaceutical and brewing facilities.
Chemical Industry
The compressor can support pressurized transportation and transfer of gases in suitable chemical processing applications.
Food & Beverage Industry
Compressed gas can be used for selected blow-moulding and bottle-manufacturing processes, depending on the application.
Machinery Manufacturing
The compressor can be applied to compressed-gas systems used for parts cleaning and dust removal in machinery manufacturing environments.
Customization Options
The DF-0.45/(8-10)-250 can be configured according to project-specific requirements.
Available configuration options may include:
- Gas flow capacity
- Inlet pressure
- Discharge pressure
- Cooling arrangement
- Lubrication specification
- Motor starting method
- PLC control system
- DCS communication
- Skid configuration
- Instrumentation
- Safety systems
- Equipment marking and documentation
Lubricating oil selection can also be adapted according to ambient temperature conditions. The supplied specifications identify L-DAB150 for temperatures above 5°C and L-DAB100 for temperatures below 5°C.
Key Advantages
- High-pressure CNG compression up to 25.0 MPa.G
- D-type symmetrical balanced structure
- Three-stage differential compression
- Low-oil lubrication arrangement
- High-efficiency oil separation
- Explosion-proof 45 kW motor
- Skid-mounted integrated design
- PLC-based automatic control
- MODBUS-RTU communication capability
- Compact installation configuration
- Suitable for CNG and natural gas applications
- Adaptable to industrial gas compression requirements
CNG Compressor Solutions by Aegis Projects
Aegis Projects Technology Pvt. Ltd. provides engineered solutions for CNG compressor systems, natural gas compressor skids, high-pressure gas compression, industrial gas systems, automation, instrumentation, and turnkey project requirements.
Our team can support the integration of compressor packages with gas piping, valves, instrumentation, PLC controls, electrical systems, safety systems, cooling arrangements, and skid-mounted equipment.
For the DF-0.45/(8-10)-250 CNG Compressor or a customized natural gas compression system, share your required gas composition, flow rate, inlet pressure, discharge pressure, operating conditions, and installation requirements with Aegis Projects.
Aegis Projects Technology Pvt. Ltd. — Engineered CNG, Gas Compression & Industrial Automation Solutions.
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