The American Petroleum Institute Specification 6D provides comprehensive requirements specifically for pipeline valves, while API Specification 6FA defines fire testing procedures, API 607 establishes alternative fire testing protocols, and API 624 or ISO 15848 define fugitive emissions testing requirements applicable to valves in LNG service https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/