Safety Lifecycle & Management Flashcards
7 cards from real SIL practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Safety Lifecycle & Management flashcards as text
During which phase of the IEC 61511 safety lifecycle is a Process Hazard Analysis (PHA) most appropriately conducted?
Answer: During the concept and hazard identification phase
The PHA is conducted during the early concept and hazard identification phase to identify hazards before design decisions are locked in.
What document formally defines the functional and integrity requirements of each Safety Instrumented Function (SIF) before detailed design begins?
Answer: Safety Requirements Specification (SRS)
The Safety Requirements Specification (SRS) formally captures the functional and integrity requirements for each SIF prior to design.
Which lifecycle phase immediately follows the Safety Requirements Specification in IEC 61511?
Answer: SIS design and engineering
After the SRS is established, the next lifecycle phase is the design and engineering of the Safety Instrumented System.
In IEC 61511, what is the primary purpose of a Functional Safety Assessment (FSA)?
Answer: To verify that functional safety has been achieved or is on track to be achieved
The FSA provides an independent judgment of whether the safety lifecycle activities have been conducted correctly and functional safety is achieved.
What is the minimum recommended number of independent Functional Safety Assessments during the IEC 61511 lifecycle for a high-risk application?
Answer: Multiple, at key lifecycle phases such as after SRS, after design, and after installation
IEC 61511 recommends FSAs at multiple key phases — including after SRS completion, after design, and after installation — to catch issues early.
The 'proof test interval' is a key parameter in SIL verification. What does it define?
Answer: The maximum time allowed between periodic tests that reveal dangerous undetected failures
The proof test interval defines how often the SIF must be fully tested to reveal dangerous hidden failures and maintain the required SIL.
Which safety lifecycle concept requires that lessons learned from incidents, near-misses, and proof tests be fed back to improve safety management?
Answer: Safety lifecycle feedback and review
IEC 61511 requires a feedback and review mechanism so that operational experience informs updates to the SRS, procedures, and maintenance practices.