Safety Integrity Level (SIL)
A common way of ranking the dependability of a Safety Instrumented Function (SIF) is to use a simple numerical scale
Safety Instrumented System (SIS)
A Safety Instrumented System (SIS) is engineered to perform “specific control functions” to failsafe or maintain safe operation of a process when unacceptable or dangerous conditions occur.
SIS Logic Solver
Control hardware for safety instrumented functions should be separate from the control hardware used to regulate the process, if only
Pilot-operated Safety and Relief Valves
While many safety and relief valves actuate by the direct action of the process fluid forcing against the valve plug
Direct-actuated Safety and Relief Valves
Pressure Relief Valves (PRVs) and Pressure Safety Valves (PSVs) are special types of valves designed to open up in order
Rupture disks
A Rupture Disc, also known as a pressure safety disc, burst disc, bursting disc, or burst diaphragm, is a non-reclosing
Over Pressure Protection Devices
Fluid pressure exerts force on any surface area it contacts, as described by the formula F = PA. One practical
Proof Testing of Safety Instrumented Systems
A reliability enhancing technique related to preventive maintenance of critical instruments and functions, but generally not as expensive as component
High Reliability of Safety Instrumented Systems
Instrumentation safety may be broadly divided into two categories: the safety hazards posed by malfunctioning instruments, and special instrument systems
Concept of Redundancy in Control Systems
The Mean time between failures (MTBF) of any system dependent upon certain critical components may be extended by duplicating those
Component De-rating in Control Systems
Some control system components exhibit an inverse relationship between service load (how “hard” the component is used) and service life
