LNG Turbo Expander

Core Refrigeration Equipment for LNG Production

 

The LNG turbo expander is the primary refrigeration source in natural gas liquefaction processes. It expands high-pressure natural gas or LNG through a turbine wheel to produce the cryogenic temperatures required for LNG production. The expander is a critical component in baseload LNG plants, floating LNG production units, and small-scale LNG liquefaction facilities.

The expander uses a high-efficiency radial turbine design with an impeller precision-machined from high-strength aluminum alloy or stainless steel. The impeller is dynamically balanced for high-speed operation. The bearings are either aerodynamic journal bearings or magnetic bearings validated for cryogenic service-both configurations eliminate the need for lubrication oil, preventing oil vapor contamination of the LNG product. This is particularly important for LNG applications where product purity is essential.

Flow rates range from 0.5 m³/h up to 500 m³/h, with pressure differentials from 0.5 MPa to 10 MPa. The expander can be configured as a skid-mounted package integrating the turbine body, bearing system, seal system, and control system on a common base, simplifying site installation and reducing project construction time.

Testing and Quality Assurance

 

Each expander undergoes mechanical running tests and aerodynamic performance testing before shipment. The company holds ISO 9001, 14001, and 45001 certifications, and the engineering team has extensive experience in LNG equipment. The expander can also be applied to natural gas pipeline pressure energy recovery for power generation.

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The lead time from technical approval to delivery is typically 32 weeks for custom-engineered units. After delivery, installation guidance, commissioning support, and spare parts supply are available as specified in the contract. Assistance with classification society certification can be provided upon request.

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