Testing protocols for LNG valve seals include cryogenic temperature testing, thermal cycling, pressure testing at low temperatures, and fugitive emissions testing per API standards. Qualification programs simulate actual service conditions, verifying seals maintain zero-leakage performance through specified cycle counts before approving designs for field installation. https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/