As liquid hydrogen (LH?) infrastructure scales from pilot projects to global heavy-duty mobility, the integrity of fluid sealing systems under dynamic loads becomes a critical safety determinant. The transition from static storage to mobile applications (e.g., LH? trailers, maritime vessels, and aerospace) introduces rigorous mechanical stresses combined with cryogenic temperatures (20 K), challenging the limits of conventional sealing technologies.
This presentation provides a field application review of static and dynamic metallic sealing technology, analyzing its deployment in cryogenic LH? transport tanks in road mobility, maritime, as well as aerospace application environments. We develop metallic seal designs with specific care in  evaluating the predicted performance of these seals in simulated environment and then, both in our own test labs and with the partnership of our customers, under actual service conditions. Design validation is supported by simulation tools and available material data, while recognizing that specific hydrogen-related phenomena in cryogenic condition remain not fully characterized. Therefore, application experience and field feedback remain essential to ensure reliable sealing performance. We focus our seal development on material selection,  on  their resilience in application thermal cycling and transport-induced vibrations, and target in-service leak rate expectations. In some of these  example designs, it is  demonstrated how the high elastic recovery of the metallic seal core compensates for flange separation events during transit and vibration, maintaining a leak-tight barrier where traditional gaskets may fail.
Based on this proven operational heritage in cryogenic logistics, we explore the design parameters required to meet the specific safety margins of future hydrogen mobility and use as a future fuel source. The mechanical reliability demonstrated in some of these tank applications can be used to validate the technology's readiness for the hydrogen economy, specifically for mitigating leakage risks in high-vibration, long-term service environments. Furthermore in dynamic rotational sealing, previous designs have proven to support system performance and failure criticality  even under cryogenic loadings of space launch vehicles.

Keywords
Cryogenic Tanks|Metal Seals|Operational Reliability|Liquid Hydrogen (LH?)|Dynamic Sealing