LNG Refuelling Station

Cryogenic LNG Storage Tank

The LNG storage tank is a critical component for storing liquefied natural gas at fueling stations. It typically features a double-layer vacuum-insulated structure, with the inner tank made of S30408 stainless steel and the outer shell constructed from Q345R low-alloy steel. The interlayer is filled with high-performance insulation material, offering thermal conductivity as low as 0.002 W/m·K and maintaining a daily evaporation rate below 0.2%, ensuring the stable storage of LNG at -162°C.
Tank volume varies depending on station size, with common capacities including 50 m³ and 100 m³, and can be scaled up to support tens of thousands of cubic meters, meeting the needs of large-scale energy storage.

 Cryogenic Pump Skid System

The cryogenic pump skid integrates key components such as cryogenic centrifugal pumps or submerged pumps, valves, pipelines, and instruments. It serves as the power unit that transfers LNG from the storage tank to the dispenser. The pump system features variable frequency control technology, allowing automatic flow adjustment based on fueling demand, with a maximum flow rate of up to 60 m³/h. It includes anti-cavitation and overload protection functions to ensure stable operation.
The skid is designed with precision piping to minimize flow resistance and enhance transmission efficiency.

LNG Dispenser

The dispenser is the terminal equipment that delivers LNG directly to vehicles. It is equipped with high-precision metering and fast-filling capabilities, achieving a measurement accuracy of ±0.1% FS and a maximum filling speed of 150 kg/min. The system supports multiple payment methods, including IC cards and mobile payments.
Safety features include an emergency shut-off device, overcurrent protection, and a static grounding system. It is compatible with global interface standards such as ISO 20423 and AGA NGV1, supporting a wide range of LNG vehicle brands.

Control System

At the core of the system is a PLC-based programmable logic controller, which integrates data acquisition, processing, and analysis functions. It enables real-time monitoring and intelligent control of parameters such as tank level, pressure, temperature, pump skid operation, and dispenser flow rate.
With 4G/5G communication capabilities, the system supports remote fault diagnosis, parameter adjustment, and software upgrades, with a fault response time of less than 1 hour. It also features a high-definition touchscreen human-machine interface (HMI) for intuitive operation and management.

Safety Devices

Emergency Shut-Off Valve: Can be activated remotely or manually to quickly isolate the pipeline in the event of leaks, fires, or other emergencies, preventing escalation.

Combustible Gas Alarm System: Utilizes laser or catalytic combustion sensors with detection accuracy of 0.1 ppm; automatically triggers audible and visual alarms upon detecting LNG leakage.

Fire Suppression System: Equipped with water curtain nozzles and foam extinguishing devices, which activate rapidly in case of fire to suppress open flames and prevent the spread of fire.

Lightning and Static Protection: Uses a grounding system and equipotential bonding to eliminate static electricity generated during operation and protect equipment from lightning strikes.