What is the Pressure of the CNG Daughter Station Cylinder Bank?

Recently, a friend planning to build a refueling station asked me: "I've seen 20MPa industrial cylinder banks on the market at an attractive price. Can I use them in a CNG daughter station to save some costs?"

My answer was straightforward: Absolutely not. If a CNG daughter station is equipped with a cylinder bank, it must be a 25MPa working pressure unit. It's a hard rule—never compromise safety by using 20MPa industrial cylinders to cut corners.

This 25MPa figure isn't plucked from thin air. It’s crucial to the entire operational logic of a CNG Gas Station and vehicle safety.

Pressure Dictates Efficiency and Safety.
The CNG buses and taxis we see daily typically have on-board cylinders with a working pressure of 20MPa. Think about it: if the storage bank at the daughter station is only 20MPa, as gas is dispensed and pressure drops, when it equalizes with the vehicle's cylinder pressure, refueling stops. At that point, the vehicle might only be 60-70% full.

When HUAYAN International designs its CNG Filling Stations, we strictly adhere to this industry principle. Look at our integrated 1200Nm³/h or 2500Nm³/h daughter stations; the technical specifications clearly state: Inlet pressure is 3-20MPa, while the outlet pressure (the cylinder bank's working pressure) is ≤25MPa. Only by storing gas at a higher pressure can you create the necessary differential to ensure fast, full fills without constantly cycling the compressor. This is the true essence of applying a CNG Tube Pressure Tank effectively.

25MPa vs. 20MPa: More Than Just Numbers
Some might ask, what's the big deal with just 5MPa?

Refueling Speed: A 25MPa bank acts like a high-energy "reservoir," enabling faster fills with greater pressure differential, reducing vehicle queue times.

Effective Capacity: At the same physical volume, a 25MPa cylinder stores significantly more gas. This means the daughter station can serve more vehicles and requires fewer replenishment trips.

System Compatibility: HUAYAN's skid-mounted stations—from compressors and PLC controls to dispensers—are all engineered around the 25MPa standard. Forcing a 20MPa industrial bank into this system disrupts the entire operational logic, from control strategies to pressure relief valve settings.

Of course, every project has unique geographical demands and scale requirements. At HUAYAN, whether it's a mobile, containerized, or skid-mounted CNG station, everything is customizable. We can tailor the storage volume, compressor power, and even generator set configurations based on your site constraints, budget, and daily capacity needs.

But there's one line we never cross—and advise you not to cross either: The cylinder bank pressure for a CNG daughter station must be 25MPa.

True expertise isn't about agreeing to everything. It's about helping our clients hold the line on the critical issues that define safety and performance.