Cleanliness standards for LNG service typically exceed those for hydrocarbon liquid or gas applications, requiring removal of all manufacturing debris, rust, scale, welding slag, and other contaminants that could damage seats, obstruct ball rotation, or create ignition sources in oxygen-enriched environments occasionally encountered during purging and commissioning activities. https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/