API 6A mandates comprehensive testing including hydrostatic pressure testing, gas-tight testing, temperature cycling, and performance verification under simulated service conditions. Hydrostatic tests apply 1.5 times rated working pressure verifying structural integrity and seal effectiveness. Gas-tight testing measures allowable leakage rates in standard cubic centimeters per minute ... https://globalsealstech.com/product-category/oil-gas-seals/api-6a-wellhead-equipment-seals/