Valve system Controls for safety

摘要

Reactive chemical processes have inherent hazards. These range from violent releases of energy to exposure of personnel to toxic substances. Safety Instrumented Systems (SIS) are used to reduce the risk of these potentials by monitoring process parameters, determining when one has exceeded its safe limit, and typically, stopping the reaction by blocking the reactant flows. Failures of the SIS fall into two categories. Obvious failures are the source of nuisance shutdowns, which cost the end user in time, resources, and most importantly, production.