Views: 0 Author: Site Editor Publish Time: 2026-06-02 Origin: Site
Many first-time buyers of CNG filling station systems get stuck on the same question: What exactly is the relationship between a daughter station and a mother station? Which one should I pick? There is no single answer — it depends on your gas source conditions, project scale, and site environment. Let's start with the core differences to help you find the right solution.
1. Core Differences Between Daughter and Mother Stations
The fastest way to understand them is to see where the gas comes from.
Comparison Item | Mother Station | Daughter Station |
Gas Source | Directly connected to the pipeline network, drawing gas from the city high-pressure gas pipeline | Relies on CNG tube trailer deliveries; no pipeline network required |
Compression Method | Compresses once to 25 MPa, then stores and dispenses | Receives gas from tube trailers (0.3–20 MPa), then re-compresses |
Applicable Scenarios | Urban areas with stable pipeline networks and high traffic volume core stations | Remote areas, regions without pipeline coverage, temporary stations, mining areas |
Flexibility | Fixed location, difficult to relocate | Containerized design, can be relocated with the project |
Investment Scale | Higher initial investment | Lower investment, faster payback |
2. Design Logic Behind Huayan's Daughter Station
Huayan's all-in-one CNG daughter station has an inlet pressure range of 0.3–20 MPa. This wide range corresponds precisely to the actual discharge pressure range of tube trailers in operation — from high pressure when the trailer first arrives to low pressure when it's nearly empty. The equipment works stably throughout, with no need to change models.
The entire system is built into a standard 40-foot container frame. All modules are fully assembled and tested before leaving the factory. On-site, simply connect the power supply and piping, and it's ready to start. With PLC fully automatic control, unattended operation is supported — meaning you don't need to station dedicated operators on-site, significantly reducing operating costs for remote stations.
3. Key Product Specifications
Parameter | Specification |
Rated Flow Rate | 1000 / 1200 / 2500 Nm³/h (optional) |
Flow Range | 500–2000 Nm³/h (2500 optional) |
Working Pressure | 25 MPa (250 bar) |
Inlet Pressure | 0.3–20 MPa (connected to tube trailer) |
Frame Size | Standard 40FT container (12192 × 2438 × 1400 mm) |
Compression Method | Hydraulic reciprocating double-acting |
Cooling Method | Air cooling + water circulation |
Control Method | PLC fully automatic, supports unattended operation |
Applicable Media | CNG / H₂ / N₂ / He |
Certification Standards | ISO9001 / ISO14001 / CE / ASME / ADR |
Delivery Cycle | Standard type: 30 days / Custom type: 40 days |
Warranty Period | 12 months of operation or 18 months from shipment (whichever comes first) |
4. Which Projects Are Better Suited for a Daughter Station?
· The local natural gas pipeline network is not yet available or expansion plans are uncertain
· The project is located in remote or independent sites such as mining areas, development zones, or logistics parks
· A quick station build is needed, and you don't want to wait for pipeline connection approval
· The station may need to be relocated and reused later due to project cycles
· Multi-gas compatibility is required (e.g., supporting both CNG and hydrogen refueling)
If your project meets any of the above criteria, a daughter station is a more practical starting point than a mother station. Upgrading later when the pipeline network becomes available is not complicated. Choosing between a daughter station and a mother station is not about right or wrong — it's about what fits. Look at your gas source conditions, project location, and cycle requirements together, and the answer often becomes clear. If you are in the early planning stages of a CNG filling station, it's a good idea to check your situation against these scenarios. Huayan's team can provide professional advice on specification confirmation, custom requirements, and more. You are welcome to contact us through our official website for further discussion.
