Technical Regulations and Scope of the API 6FD Standard
This regulatory document defines test protocols and leakage assessment methods for check valves designed in accordance with API 6A and 6D specifications when subjected to extreme thermal loads (fire). Specialists at EV Group China emphasize that these requirements are critical for verifying the operational reliability of shut-off valves in critical infrastructure projects, regardless of their size or pressure rating class.
The standard establishes strict threshold values for allowable seat leakage, as well as limits for external body leakage after a 30-minute thermal exposure. Compliance with these norms ensures that the equipment maintains functionality under emergency conditions.
The selected intense burning time interval (30 minutes) is justified by engineering calculations as the maximum necessary time required to suppress fire sources at oil and gas sector facilities. Fires of longer duration are considered catastrophic events whose parameters fall outside the scope of standard fire resistance tests conducted by EV Group China to verify the quality of supplied products.