Application of Spring Seals in the LNG Industry

1. Cryogenic Valve Sealing

   - Spring seals are widely used in LNG cryogenic valves to ensure leak-proof performance under extreme low temperatures (e.g., -162°C).  

   - Example: Spring-energized seals in LNG valves maintain elasticity and sealing integrity even during thermal cycling.

2. Pump and Compressor Systems

   - Critical for sealing LNG pumps and compressors, where spring-loaded seals prevent gas leakage and withstand thermal contraction.  

   - Example: PTFE-based spring seals are employed in LNG centrifugal pumps to handle cryogenic fluids and high-pressure differentials.

3. Flange and Pipeline Connections  

   - Used in LNG pipeline flanges to compensate for joint movement due to thermal expansion/contraction.  

   - Example: Metal spring seals (e.g., Inconel springs with PTFE jackets) provide reliable sealing for LNG transfer pipelines.

4. Storage Tank Sealing

   - Spring seals in **LNG storage tank penetrations** ensure long-term sealing stability despite temperature fluctuations.  

5. Material Considerations

   - Common materials: PTFE, PEEK, or elastomers with metal springs (stainless steel/Inconel) for cryogenic resilience.  

   - Example: Spring-energized seals with Kalrez® perfluoroelastomer are used in LNG applications for chemical resistance.

Key Advantages

- Thermal Adaptability: Maintains sealability during LNG temperature swings.  

- Low Fugitive Emissions: Meets stringent environmental standards (e.g., ISO 15848 for valve emissions).  

- Long Service Life: Resists brittle failure in cryogenic conditions.