Views: 0 Author: Site Editor Publish Time: 2026-04-17 Origin: Site
For international buyers entering the CNG refueling business, understanding exactly what equipment makes up a functional Daughter Station is essential for budgeting, site planning, and procurement. A common question we receive is: "What are the actual components I need to order, and how do they work together?" Below, we break down the complete equipment list of a standard CNG Daughter Station, based on Huayan's integrated skid-mounted solutions.
A CNG Daughter Station is not a single machine—it is an engineered system comprising several interconnected modules, each performing a critical function in the gas delivery chain from tube trailer to vehicle fuel tank.
1. Gas Unloading Column (Priority Panel)
This is the first point of entry for CNG arriving from the Mother Station via high-pressure tube trailers. The unloading column—sometimes called a priority panel—manages the gas flow from the trailer into the station's system. It typically includes high-pressure hoses, emergency breakaway couplings, manual and pneumatic valves, and pressure gauges. The column ensures safe, controlled transfer and often prioritizes gas routing either directly to the dispenser (for fast-fill during peak demand) or to the compressor inlet for storage replenishment.
2. Filtration and Gas Treatment System
Before compression or dispensing, the incoming natural gas must be cleaned of any entrained particles, moisture, or lubricant carryover that could damage downstream equipment or vehicle engines. Huayan's systems incorporate multi-stage filtration, including coalescing filters for oil and water removal and particulate filters down to micron-level precision. This protects the compressor valves, storage cylinders, and ultimately the customer's vehicle.
3. CNG Compressor Unit
The compressor is the heart of the Daughter Station. Its job is to boost the pressure of incoming gas—which arrives at varying pressures as the tube trailer depletes—up to the required storage and dispensing pressure, typically 250 bar (3,600 psi) or 200 bar depending on regional standards. Huayan offers skid-mounted reciprocating compressors ranging from 650 Nm³/h to 2000 Nm³/h, fully enclosed in weatherproof, sound-attenuated cabins. Key subcomponents include:
Compressor mainframe (multi-stage, oil-free or lubricated designs available)
Electric motor drive or gas engine drive options
Air-cooled or water-cooled heat exchanger system
Automatic control panel with PLC and HMI touchscreen interface
Safety instrumentation (pressure transmitters, temperature sensors, vibration monitoring)
4. Storage Cascade (Cylinder Groups)
CNG is stored on-site in high-pressure cylinders grouped into three pressure banks: high, medium, and low. This cascade arrangement enables efficient fast-fill operations by drawing gas sequentially from the bank that best matches the vehicle tank's current pressure. Storage capacity is measured in water volume (e.g., 6 m³, 9 m³, or 12 m³ total) and directly impacts peak-hour throughput. The cylinders conform to international standards such as ISO 11439 or ASME Section VIII.
5. CNG Dispenser
The dispenser is the customer-facing interface where vehicles are refueled. Huayan dispensers feature:
Single or dual hose configurations
Mass flow meters (Coriolis type) for high-accuracy billing
Electronic control system with LCD display showing volume, price, and total sale
Breakaway couplings and safety venting for operator protection
Optional RFID card reader or fleet management integration
6. Pressure Regulating and Metering Skid (Optional but Recommended)
For stations where precise pressure control or custody transfer metering is required—especially when the Daughter Station also supplies gas to an off-site user—a dedicated pressure regulating and metering skid (PRMS) can be included. This module reduces and stabilizes outlet pressure while providing calibrated flow measurement.
7. Interconnecting Piping and Instrumentation
High-pressure stainless steel tubing, valves, and fittings connect all modules into a unified system. Huayan's skid-mounted approach minimizes on-site piping work—most interconnections are pre-fabricated and tested at the factory, reducing installation time and leak risks.
8. Control and Monitoring System
A centralized PLC control panel manages the entire station's operation. It sequences the compressor, monitors storage pressures, controls priority panel valves, and logs operational data. Remote monitoring capability via 4G or Ethernet allows station owners to track performance and receive fault alerts from anywhere.
For buyers seeking even faster deployment or temporary operations, Huayan also offers Mobile CNG Refueling Stations packaged in 20ft or 40ft containers. These self-contained units integrate the unloading column, compressor, storage cascade, and dispenser into a single transportable module. Simply place the container on a prepared foundation, connect power, and begin refueling—ideal for construction sites, mining operations, or market entry trials.
Jiangsu Huayan International Trade Co., Ltd. has been designing and manufacturing CNG infrastructure equipment since 2005. Headquartered in Xuzhou, Jiangsu Province, China, we operate over 222,000 square meters of advanced production facilities where every component—from compressor blocks to dispenser assemblies—is fabricated under strict quality control.
Complete In-House Manufacturing: Unlike trading companies that source from multiple vendors, Huayan controls the entire production chain. This ensures component compatibility, consistent quality, and competitive pricing.
Global Project Experience: Over 80% of our output serves international markets. We have successfully delivered turnkey CNG Daughter Stations to Nigeria, Tanzania, and clients across Africa, Southeast Asia, and the Middle East.
Certified Compliance: Our equipment meets ISO 9001, CE, and other international standards, with SGS third-party inspection available for all shipments.
Comprehensive Support: From initial capacity calculation and equipment selection to installation drawings, commissioning assistance, and spare parts supply, Huayan provides end-to-end project support.
