Pressure testing verifies seal integrity before placing wellhead equipment into service, following detailed procedures specified in API 6A requirements. Low-pressure tests at 50-100 PSI using air or nitrogen identify gross leaks requiring immediate correction. High-pressure tests at 1.5 times working pressure for fifteen minutes confirm seal capability to contain design pressures. https://globalsealstech.com/product-category/oil-gas-seals/api-6a-wellhead-equipment-seals/