Testing protocols for LNG seals include cryogenic pressure testing, thermal cycling, and fire testing. Seats are tested at minus 320°F under pressure verifying sealing effectiveness. Stem seals undergo fugitive emissions testing. Fire tests validate emergency sealing capability. Full-scale valve testing provides confidence seals perform reliably in actual LNG service conditions. https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/