Sample Problem: TRIR Calculation - Total Recordable Incident Rate
Example
Problem Statement: A construction company worked 500,000 man-hours in a year. During that year, they had 4 OSHA-recordable incidents (injuries requiring medical treatment beyond first aid, restricted work, or days away from work). Calculate the company's TRIR.
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Sample Problem: Lost Time Injury Frequency Rate (LTIFR)
Example
Problem Statement: A general contractor employs 400 workers. Last year, they worked an average of 50 hours per week for 48 weeks. There were 3 injuries that resulted in lost days from work. Calculate the LTIFR per 1,000,000 hours worked.
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Sample Problem: Hierarchy of Controls - Excavation Hazard
Example
Problem Statement: Workers need to install a utility pipe in a 4-meter deep trench in Type C soil. The trench walls are vertical. Using the Hierarchy of Safety Controls, develop the most effective strategy to protect the workers from a cave-in.
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Key Takeaways
- Lagging Indicators: TRIR and LTIFR are lagging indicators; they tell you how many people were hurt in the past. They are essential for bidding and insurance rates (EMR - Experience Modification Rate).
- Hierarchy Effectiveness: Engineering controls (designing out the hazard or physically isolating it) are vastly superior to Administrative controls (rules and training) or PPE.
- Zero Tolerance: Fall protection, excavation safety, and electrical hazards (the "Fatal Four") require the highest levels of planning and strictest enforcement.