..Safety Instrumented Systems (SIS) are installed in Process Plants to mitigate process hazards by taking the process to a safe state when predetermined set points have been exceeded or when safe operating conditions have been transgressedThe SIS is one Protection Layer in a multi layered safety approach since no single

priority for alarms, and safety integrity level for SIFsA typical chemical plant has a small number of safety instrumented functions, but may have hundreds or thousands of alarms in the Basic Process Control System (BPCS)Each safety instrumented function is evaluated individually and is designed and verified to address a specific hazard.

Safety integrity level (SIL) analysis is a powerful methodology used in plant integrity management to measure the required performance of safety instrumented functionsIts discrete level approach (one out of a possible four) for specifying the safety integrity requirements of the safety function makes it easy to communicate the result of the

A DuPont analysis is used to evaluate the component parts of a company's return on equity (ROE)This allows an investor to determine what financial activities are contributing the most to the

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SCAI or Safety Controls, Alarms, and Interlocks are process safety safeguards implemented with instrumentation and controls, used to achieve or maintain a safe state for a process, and required to provide risk reduction with respect to a specific hazardous event (ISA [,]).

DuPonts Approach of Safety Instrumented Functions Bypassing Hans van Dongen January ,

The international membership of ISA and the terminology being developed for IEC were essential in identifying and reaching consensus on such terms as safety instrumented systems (SIS), safety integrity level (SIL), safety instrumented function (SIF), basic process control system (BPCS), and the like.

The importance of people and leadership for successful implementation of PSM in a safety is a key belief of DuPontThat is why at the core of the DuPont model is Management CommitmentOur experience has proven that strong leadership commitment facilitates implementation of a safety management system and is necessary to implement and sustain real