This standard provides requirements for installing and maintaining surface safety valves (SSV) and underwater safety valves (USV). Included are requirements for receiving inspection, installation and maintenance, field and off-site repair, testing procedures with acceptance criteria, failure reporting, and documentation. Power and control systems for SSVs/USVs are not included. This document is applicable to SSVs/USVs used or intended to be used as part of a safety system, as defined by documents such as API 14C. NOTE SSV/USV system architecture and power/control systems for SSVs/USVs are addressed in safety system documents such as API 14C. This standard is the revision of and supersedes API 14H, Fifth Edition.