When designing a Safety Instrumented System (SIS), what is the primary consideration for selecting a sensor, particularly in a high-demand mode of operation?
Question 2
A process plant is upgrading its safety systems. The engineers are debating between implementing a complex interlock system within the Basic Process Control System (BPCS) or a separate Safety Instrumented System (SIS). From a functional safety perspective, which approach is generally preferred for critical safety functions and why?
Question 3
Consider a Safety Instrumented Function (SIF) designed to prevent overpressure in a reactor. The SIF consists of a pressure transmitter, a logic solver, and a safety valve. If the required Safety Integrity Level (SIL) for this SIF is SIL 3, which of the following statements about the Probability of Failure on Demand (PFD$_{avg}$) is true?
Question 4
In the context of a Safety Instrumented System (SIS) lifecycle, what is the primary purpose of the 'Safety Requirements Specification' (SRS) phase?
Question 5
A chemical plant utilizes a Safety Instrumented System (SIS) to protect against an exothermic reaction runaway. The SIS includes redundant temperature sensors, a triple modular redundant (TMR) logic solver, and two independent safety valves. This design approach primarily aims to mitigate which type of failure?
