ASP Risk Assessment and Management 5

Question 1

A safety professional calculates the Probability of Failure on Demand (PFD) for a safety instrumented function (SIF). A PFD of 0.01 corresponds to which Safety Integrity Level (SIL)?

Accepted Answer

SIL 2

Answer

SIL 2 corresponds to a PFD range of 0.001 to 0.01, meaning the safety function fails on demand between 0.1% and 1% of the time.

Question 2

Which qualitative risk assessment technique uses a structured 'what-if' format with a standardized set of guide words such as 'more,' 'less,' 'no,' and 'reverse'?

Accepted Answer

Hazard and Operability Study (HAZOP)

Answer

HAZOP applies guide words to process parameters to systematically identify deviations that could lead to hazardous consequences.

Question 3

A company performs a bow-tie analysis. What does the LEFT side of the bow-tie diagram represent?

Accepted Answer

Threats and prevention barriers leading to the top event

Answer

The left side of the bow-tie depicts threats (causes) and the preventive barriers that stop them from causing the central hazardous event.

Question 4

In a quantitative risk assessment, what does the term 'Individual Risk' specifically measure?

Accepted Answer

The annual probability of death for a specific individual at a given location

Answer

Individual risk quantifies the probability per year that a specific person located at a defined point will be fatally injured by a hazard.

Question 5

A facility reviews its process safety information (PSI) as part of a Process Hazard Analysis (PHA). Under OSHA PSM (29 CFR 1910.119), how often must a PHA be revalidated?

Accepted Answer

Every 5 years

Answer

OSHA PSM requires that PHAs be updated and revalidated at least every five years to ensure they reflect current process conditions.

(ASP) Associate Safety Professional Practice Test

(ASP) Associate Safety Professional Practice Test

ASP Risk Assessment and Management 5