What is your understanding of Australian engineering standard 61508?

What is your understanding of Australian engineering standard 61508?

IEC 61508 is a basic functional safety standard applicable to all industries. An engineering process called the safety life cycle is defined based on best practices in order to discover and eliminate design errors and omissions. A probabilistic failure approach to account for the safety impact of device failures.

What is SIL compliance?

Safety integrity level (SIL) is defined as a relative levels of risk-reduction provided by a safety function, or to specify a target level of risk reduction. In the functional safety standards based on the IEC 61508 standard, four SILs are defined, with SIL 4 the most dependable and SIL 1 the least.

What is SIL 2 certified?

SIL2 The step from SIL1 to SIL2 normally requires self-testing facilities for hardware components, reduced maintenance intervals for the sensors, strict requirements during development and thoroughly documented software.

How is SIL calculated?

To determine a SIF’s SIL level, the SIF’s overall PFD must be calculated. This SIL calculation basically combines the Failure Rate data for each of the individual SIF components (i.e. the sensors, logic solvers and control elements) and accounts for test frequency, redundancy, voting arrangements, etc.

What is a SIL assessment?

About Safety Integrity Level (SIL) Assessment The SIL is a numeric value that represents an overall rating for the instrumented function. This rating tells you to what degree the instrumented function meets its requirements to mitigate risk.

What is the difference between SIL 2 and SIL 3?

The higher the SIL, the greater the risk of failure. And the greater the risk of failure, the stricter the safety requirements….What Is SIL?

Safety Integrity Level Probability of Failure on Demand Risk Reduction Factor
SIL 2 ≥103 to <102 1,000 to 100
SIL 1 ≥102 to <101 100 to 10

What is a SIL 3 system?

SIL 3 is one of the safety integrity levels defined by the IEC 61508 standard. It is defined by a risk reduction factor of 1.000 – 10.000 of failure on demand and 10-8 – 10-7 for probability of failure per hour. SIL 3 is the highest safety integrity level that is economically feasible for most industrial operations.


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