Fugitive emission testing of LNG ball valve packing follows ISO 15848-1 with helium at -196°C and 600 cycles. Only packing systems achieving tightness class BH with leakage below 10⁻⁶ mg·s⁻¹·m⁻¹ are approved for major LNG projects in Qatar, Australia, USA, and Russia under strict environmental regulations. ( https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/