LNG Stations & Cryogenic Skid-Mounted Refueling Systems

 

 

An LNG station is an integrated cryogenic turnkey refueling and storage facility engineered to receive, store, and dispense liquefied natural gas (LNG) to heavy-duty trucks and industrial offtake networks. Comprising a vacuum-insulated double-wall horizontal storage tank, a cryogenic submerged pump skid, ambient pressure build vaporizers, high-accuracy mass flow dispensers, and programmable safety control systems, the integrated assembly maintains product temperature at -162°C while providing rapid, low-loss vehicle fueling.

 

 
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System Configuration & Types

 

Skid-Mounted Integrated LNG Refueling Station

Combines the cryogenic pump sump, instrumentation panel, emergency shut-off valves, and electronic mass dispensers onto a single structural steel skid, minimizing field cryogenic pipe welding.

Vacuum-Insulated Storage & Vaporization Unit

Features horizontal perlite or multi-layer super-insulation (MLI) inner stainless steel and outer carbon steel tanks coupled with automatic self-pressurization vaporizers.

Skid-Mounted Cryogenic Submerged Pump System

Houses dual-redundant vertical submerged pumps inside a vacuum-jacketed sump, eliminating shaft seal leakage and ensuring rapid cool-down prior to high-pressure vehicle dispensing.

 

Key Technical Parameters

 

Technical Parameter

Specification Range / Standard

Storage Tank Effective Volume

50 m³ – 100 m³ (Horizontal perlite / MLI vacuum insulated)

Maximum Working Pressure (Storage)

0.8 MPa – 1.6 MPa (Adjustable relief settings)

Daily Boil-Off Rate (BOR)

<= 0.3% / day (Under standard ambient conditions)

Cryogenic Submerged Pump Flow Rate

30 m³/h – 50 m³/h (Head pressure up to 1.6 MPa)

Dispensing Flow Rate

45 kg/min – 100 kg/min (Pneumatic breakaway coupling integration)

Piping Insulation

Vacuum-jacketed stainless steel piping (VJ pipe)

Electrical & Control Standard

Siemens/Schneider PLC with Ex d II BT4 explosion-proof rating

 

Application Scenarios

 

 

Highway Heavy-Duty Truck Refueling Hubs

Intercity logistics corridors providing high-speed LNG dispensing for long-haul Class 8 commercial fleets.

 

Port & Industrial Logistics Depots

Dedicated private fueling stations serving heavy drayage trucks operating within marine terminals and mining zones.

 

Industrial Gas Peak Shaving & Vaporization Plants

Secondary off-grid gas supply stations feeding natural gas boilers via ambient air-heated vaporizers during peak municipal demand.

 

 

Selection Criteria & Engineering Checklist
 
 
 

Daily Dispensing Volume & Peak Traffic

Calculate average hourly vehicle throughput to size the cryogenic pump flow rate and storage tank holding capacity.

 
 

Boil-Off Gas (BOG) Management

Evaluate ambient temperature profiles to ensure tank insulation performance matches local climatic heat loads and venting regulations.

 
 

Inlet Transfer Compatibility

Verify tanker unloading connection heights, liquid fill lines, and vapor return manifold configurations to match regional LNG transport trailers.

 
 

Seismic & Wind Load Compliance

Specify structural anchoring and foundation load ratings aligned with local seismic zone coefficients and wind speed safety codes.

 

 

Manufacturing, Materials & Quality Control

 

LNG Compressor Station

Cryogenic Vessel Construction

Inner tanks fabricated from austenitic stainless steel (ASTM A240 Gr. 304) subjected to 100% radiographic weld inspection and cryogenic helium mass spectrometer leak testing.

 
Daughter Booster Compressor

Vacuum Insulation Processing

Perlite powder filling followed by high-vacuum baking and dynamic pumping to achieve internal absolute pressures below 0.05 Pa, ensuring long-term thermal integrity.

 
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Vacuum-Jacketed Piping Fabrication

Prefabricated VJ lines featuring inner and outer stainless steel conduits with thermal expansion bellows, preventing frost formation and cold-end heat leakage.

 
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Factory Acceptance Testing (FAT)

Fully integrated pump skids and control panels undergo dry-run electrical interlock verification, pneumatic pressure testing, and functional calibration of mass flow meters.

 

 

Customization & Engineering Support
Layout & Footprint Adaptation
Modular skid dimensions engineered to fit restricted urban plot geometries while maintaining mandatory hazardous area separation distances.
Cryogenic Valve Package Integration
Pneumatic actuated emergency shut-off valves (ESDV) linked to optical flame detectors and line-mounted thermal sensors.
Data Acquisition & Telemetry
Industrial SCADA integration supporting Modbus, Profibus, or cellular gateways for real-time tank liquid level monitoring, temperature logging, and remote pump diagnostics.

 

 

Factory Workshop

 

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FAQ

 

Q: How is boil-off gas (BOG) managed during periods of low station throughput?

A: When station utilization drops and tank pressure approaches the relief setpoint, the integrated pressure control system automatically routes excess boil-off gas to a dedicated ambient air vaporizer, feeding it directly into an industrial offtake line or safely flaring/recondensing it according to site design.

Q: What prevents vapor lock and cavitation in the cryogenic submerged pump?

A: Placing the centrifugal pump motors entirely inside a vacuum-insulated, liquid-filled sump keeps the pump components pre-chilled at cryogenic temperatures (-162°C), eliminating vapor bubble formation and ensuring instant, cavitation-free priming upon start-up.

Q: What safety interlocks govern the LNG dispensing sequence?

A: The PLC control loop prevents fueling unless the breakaway coupling is securely latched, the vehicle grounding wire has verified continuity, and zero methane concentrations are detected by perimeter sensors. If a pull-away incident occurs, the dual-action breakaway valve mechanically seals both ends to prevent liquid release.

Q: What manufacturing and regulatory documentation is delivered with export units?

A: Each system ships with a comprehensive Manufacturer Data Report (MDR) containing ASME Section VIII Division 1 or EN 13458 pressure vessel dossiers, material mill test certificates (MTC), helium leak test logs, NDT inspection records, and electrical explosion-proof compliance certificates.

Qingdao Lenado Intelligent Equipment Co., Ltd. is one of the most experienced LNG stations manufacturers and suppliers in China. We have world-leading production equipment and strong manufacturing capabilities. Please rest assured to wholesale bulk customized LNG stations from our factory.

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