What SIL should be listed in the Safety Requirement Specification if a risk reduction factor of 375 was calculated?

What SIL should be listed in the Safety Requirement Specification if a risk reduction factor of 375 was calculated?

• A. SIL1
• B. SIL2
• C. SIL3
• D. SIL4

Answer: (C)

To determine the appropriate Safety Integrity Level (SIL) in the Safety Requirement Specification based on a calculated risk reduction factor of 375, it is essential to understand how risk reduction factors correlate with SILs. SILs are categorized from 1 to 4, with each level indicating a specific range of risk reduction factors required to achieve adequate safety for a given system. The relationship between risk reduction factors and SIL levels is defined as follows: - SIL1 corresponds to a risk reduction factor between 1 and 10. - SIL2 corresponds to a risk reduction factor between 10 and 100. - SIL3 corresponds to a risk reduction factor between 100 and 1,000. - SIL4 corresponds to a risk reduction factor greater than 1,000. Given a risk reduction factor of 375, this falls between the ranges associated with SIL2 and SIL3. Specifically, SIL3 is defined for risk reduction factors from 100 up to 1,000, making it the correct choice for a risk reduction of 375. Choosing SIL2 would not provide sufficient safety assurance, as it only covers reduction up to 100 and would not achieve the necessary risk management indicated by a factor of 375. Therefore, the correct level

To determine the appropriate Safety Integrity Level (SIL) in the Safety Requirement Specification based on a calculated risk reduction factor of 375, it is essential to understand how risk reduction factors correlate with SILs.

SILs are categorized from 1 to 4, with each level indicating a specific range of risk reduction factors required to achieve adequate safety for a given system. The relationship between risk reduction factors and SIL levels is defined as follows:

• SIL1 corresponds to a risk reduction factor between 1 and 10.

• SIL2 corresponds to a risk reduction factor between 10 and 100.

• SIL3 corresponds to a risk reduction factor between 100 and 1,000.

• SIL4 corresponds to a risk reduction factor greater than 1,000.

Given a risk reduction factor of 375, this falls between the ranges associated with SIL2 and SIL3. Specifically, SIL3 is defined for risk reduction factors from 100 up to 1,000, making it the correct choice for a risk reduction of 375.

Choosing SIL2 would not provide sufficient safety assurance, as it only covers reduction up to 100 and would not achieve the necessary risk management indicated by a factor of 375. Therefore, the correct level