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IE 419 Work Design: Productivity and Safety Dr. Andris Freivalds Class #30

IE 419 Work Design: Productivity and Safety Dr. Andris Freivalds Class #30. IE 419 Work Design: Productivity and Safety Dr. Andris Freivalds Class #30. 4) Fail-Safe Design = Ensures that in case of failure there is no injury. Passive devices to ↓ system energy level

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IE 419 Work Design: Productivity and Safety Dr. Andris Freivalds Class #30

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  1. IE 419 Work Design:Productivity and Safety Dr. Andris Freivalds Class #30 IE 419

  2. IE 419 Work Design:Productivity and Safety Dr. Andris Freivalds Class #30 IE 419

  3. 4) Fail-Safe Design = Ensures that in case of failure there is no injury • Passive devices to ↓ system energy level • Fail-active design to maintain energized level until corrective action taken • Fail-operational design to maintain safe condition IE 419

  4. 5) Failure Minimization - 1 • Parameter monitoring • Warnings • Visual • Auditory • Smell, taste • Feel IE 419

  5. 5) Failure Minimization - 2 • Safety factor = Smin/Lmax = • Safety margin • Failure rate reduction • Derating • Timed replacements • Screening • Redundancy IE 419

  6. Safe procedures • Back out and recovery • Restore normal sequence • Inactivate • Suppress the hazard IE 419

  7. Minimize and Control Damage • Isolation and barriers • Personal protective equipment • Escape and survival equipment • Rescue equipment IE 419

  8. Acceleration, Falls, Impacts (Ch.16) • National Safety Council: • Struck or struck by = 20% • Falls = 16% • Motor vehicle = 3% • Energy for skull fracture = 400-900 in lbs • Potential energy = mgh • Kinetic energy = ½ mv2 • Rectilinear motion, d = ½at2 IE 419

  9. Impact Data for Fractures IE 419

  10. IE 419

  11. Prevention – Avoiding Impacts 1 • Scaffolding (1910.28) • Use guard rails (>10’ off) • Proper assembly, cross-braces • Hard, level ground • Full secured planking (non-skid) • Toe boards (4”) • Safety harness (> 6’ off) • Set away gap (<9”) • Colds, flues affect balance IE 419

  12. Prevention – Avoiding Impacts 2 • Ladders (1910.27) • Step < 20’, straight < 30’ • Sectional < 60’, locking devices (don’t tie ) • Set up • Good footing • Non-skid surfaces • Avoid metal near electrical • Avoid windy days, doors • Don’t lean sideways IE 419

  13. Prevention – Avoiding Impacts 3 • Use of safety harnesses • Dampened, padded seats • Seat belts • Air bags • Rear facing (?) IE 419

  14. Prevention –Impacts From Objects • Hard hats • Safety shoes • Safety goggles • Effect of objects from rotating machinery(.3 oz) IE 419

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