Detailed requirements for positioners, limit switches, solenoids, and handwheels.
Offers extensive recommendations for Emergency Block Valves (EBVs) and on/off valves used in Safety Instrumented Systems (SIS). api 553 pdf
The , officially titled "Refinery Valves and Accessories for Control and Safety Instrumented Systems," is a vital industry document providing recommended practices for the selection, specification, and application of automated valves in refinery services. Overview of API RP 553 Detailed requirements for positioners
The API 553 standard addresses a wide range of refinery-specific valve needs: api 553 pdf