Recommended Practice for Analysis, Design, Installation, and Testing of Safety Systems for Subsea Applications (includes Errata 1 dated July 2015) Presents recommendations for designin g, installing, and testing a process safety system for subsea applications. The basic concepts of subsea safety systems are discussed and protection methods and requirements of the system are outlined. For the purposes of this document, “subsea system” includes all process components from the wellhead (and surface controlled subsurface safety valve [SCSSV]) to upstream of the boarding shutdown valve. For gas injection, water injection, and gas lift systems, the shutdown valve is within the scope of this document. This document is a companion document to API 14C, which provides guidance for topsides sa fety systems on offshore production facilities. Some sections of this document refer to API 14C for safety system methodology and processes. This reco mmended practice illust rates how system analysis methods can be used to determine safety requirements to protect any process component. Actual analyses of the principal components are developed in such a manner that th e requirements determined will be applicable whenever the component is used in the process. The safety requirements of the individual proc ess components may then be integrated into a complete subsea safety syst em. The analysis proc edures include a method to document and verify system integrity. The uniform method of identifying and symbolizing safety de vices is presented in API 14C and adopted in this recommended prac tice