What equipment does a complete CNG daughter station actually need?

In the natural gas refueling station industry, the CNG daughter station has become the preferred solution for many operators due to its flexible construction, lower investment, and rapid deployment. However, many customers face the same question at the initial stage of a project —

"What equipment makes up a fully functional and stable CNG daughter station?"

Based on practical project experience, this article will provide a complete overview of the core equipment composition of a CNG daughter station, along with key customization points for each component.

01 CNG Daughter Station Compressor — The "Heart" of the Station

The compressor is the most critical piece of equipment in a daughter station. It is responsible for further boosting the pressure of the high-pressure natural gas delivered by tube trailers, or directly dispensing it to vehicles. We offer two mainstream technical routes:

Hydraulic-driven CNG Daughter Station Compressor

· Driven by a hydraulic piston, featuring low motor power, low power consumption, low vibration, and low noise

· Supports fully oil-free lubrication, ensuring clean, oil-free natural gas at the outlet

· Optional "dual-compressor on one skid" configuration to ensure 24-hour continuous operation

· Supports mobile APP remote monitoring and unattended operation

Mechanical Piston Compressor

· Mature technology, suitable for specific operating conditions

Customizable items: Inlet pressure range, discharge pressure (e.g., 45MPa or 70MPa), displacement, cooling method (air-cooled / water-cooled)

02 Tube Bundle Container / Cylinder Bundle — The "Mobile Warehouse" for Natural Gas

The core unit for transporting and storing high-pressure natural gas from the mother station. Available in standard 20FT and 40FT sizes, with tube counts ranging from 10 to 16 tubes, effective volume covering 4,640 Nm³ to 9,260 Nm³, and a maximum working pressure of up to 250 bar.

Customizable items: Cylinder specifications (diameter, length), number of cylinders, total volume, working pressure (20MPa / 25MPa / 30MPa), frame material, and certification standards (ISO / ASME / DOT, etc.)

03 Gas Storage Cylinder Bank — The "Buffer Reservoir" for Refueling

Provides a stable high-pressure gas source during peak refueling periods to ensure refueling efficiency. Typically divided into three groups — high, medium, and low pressure — with intelligent switching controlled by a sequence control panel.

Customizable items: Volume, grouping method, and working pressure level, all of which can be custom-designed based on average daily and peak refueling flow rates.

04 Sequence Control Panel — The "Commander" for Intelligent Dispatching

Automatically controls the charging and discharging sequence of the gas storage cylinder bank. It prioritizes the use of the low-pressure bank, then sequentially switches to the medium-pressure and high-pressure banks, maximizing gas storage utilization and improving refueling efficiency.

Customizable items: Number of control ports (e.g., 1-in-3-out, 1-in-4-out), flow range, and control logic.

05 CNG Decompression Skid — The "Pressure Regulator" for Flexible Gas Supply

If the daughter station needs to supply gas to a pipeline network or industrial users, a CNG decompression skid is required. It reduces the high-pressure natural gas through two or three stages of pressure regulation to the pressure required by the user (e.g., 0.1–4.0MPa), and is equipped with heating, metering, and odorization functions.

Customizable items: Inlet pressure, outlet pressure, flow rate, heating method (electric heating / water bath heating), and metering accuracy.

06 Auxiliary Systems — The "Safety Net" for Reliable Operation

Includes the PLC control system, instrument air system, combustible gas alarm system, video monitoring system, etc., ensuring safe, automatic, and efficient operation of the daughter station.

Customizable items: Control system brand (e.g., Siemens, SmartGen), communication method, and remote monitoring functions.

Everything is Customizable — Tailored for You

Every CNG daughter station project has unique gas source conditions, site constraints, budget targets, and operational requirements. Therefore, we offer a "full system, full equipment customization on demand" service — whether it is compressor selection, tube trailer configuration, or complete station skid integration, we can provide the optimal technical solution and product combination based on your specific needs.

About Us: Your Trustworthy CNG Energy Equipment Partner

We are a high-tech enterprise integrating R&D, design, production, sales, and system integration, with years of deep involvement in the gas compression and storage & transportation equipment field.

· Strong technical strength: We own multiple core technologies, including hydraulic-driven compression and large-volume steel-lined wound cylinders, with product performance reaching internationally advanced levels.

· Complete certifications: Products are designed and manufactured in strict accordance with international standards such as ISO and ASME, and have obtained multiple international certifications including CE, ATEX, and EAC.

· Global market recognition: Our products and services have been widely used in refueling stations, industrial gas supply, and mobile energy applications in more than 40 countries and regions worldwide.

· One-stop service: From single equipment supply to complete CNG refueling station EPC turnkey projects, we provide project consultation, technical selection, customized production, installation and commissioning, and lifelong operation and maintenance services.

Choose us, and you choose professionalism and reliability. No matter how special your CNG daughter station requirements are, we have the capability to create the optimal customized solution for you.

Contact us to start your exclusive CNG daughter station solution