This case study examines the development of spring-energized polymer face seals engineered for LNG transfer and tank systems operating at cryogenic temperatures approaching −320 °F. Traditional elastomer seals struggle in these environments due to thermal contraction, embrittlement, and loss of sealing force, so the project focused on combining advanced PTFE-based seal jackets with a constant-force metallic spring to maintain reliable contact stress independent of temperature.

Through cryogenic testing under liquid nitrogen–equivalent conditions and pressures up to 1,000 psi, the seals demonstrated stable performance, repeatable sealing behavior, and no measurable leakage across multiple sizes. The results show how purpose-engineered spring-energized seals can provide predictable, long-term reliability for demanding cryogenic applications, reinforcing the role of Gallagher Fluid Seals in supporting modern LNG infrastructure.