Risk Management & Maintenance Flashcards
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Read the first 7 Risk Management & Maintenance flashcards as text
Which type of maintenance task is justified by RCM when a failure is hidden and no other proactive task is applicable?
Answer: Failure-finding task
Failure-finding tasks (FFTs) periodically check hidden functions to detect failures that would otherwise be undetected until a demand occurs.
What does the term 'Risk Acceptance Criteria' define in a reliability program?
Answer: The threshold levels below which risk is deemed tolerable
Risk acceptance criteria set the quantitative or qualitative boundaries that determine whether a risk level is acceptable or requires mitigation.
Which condition-monitoring technique is best suited for detecting rolling element bearing defects at an early stage?
Answer: Vibration analysis using high-frequency techniques
High-frequency vibration techniques (e.g., SPM, envelope analysis) detect the characteristic impulses of defective rolling element bearings early in degradation.
In probabilistic risk assessment, a 'Common Cause Failure' (CCF) occurs when:
Answer: Multiple redundant components fail due to a single shared root cause
CCF undermines redundancy by causing multiple components to fail simultaneously from a single shared cause such as an environmental event or design flaw.
The primary purpose of a Maintenance Significant Item (MSI) analysis in RCM is to:
Answer: Identify items whose failure has significant operational or safety consequences
MSI analysis filters the equipment list to focus RCM analysis resources on items whose failures matter most to safety or operations.
What is the primary advantage of a quantitative risk assessment (QRA) over a qualitative one?
Answer: It produces numerical risk estimates enabling comparison against defined criteria
QRA produces probability and consequence values that can be compared against numerical risk tolerability criteria to make defensible decisions.
Which maintenance organizational model assigns dedicated maintenance crews to specific production lines or assets?
Answer: Area-based (decentralized) maintenance
Area-based maintenance assigns crews to specific areas or assets, reducing travel time and increasing familiarity with equipment.