Lecture 20 Flashcards Preview

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Flashcards in Lecture 20 Deck (10):
1

Engineering Design Mistakes

- May come in many forms
- Design decisions
- Ignoring safety measures
- Failure to anticipate events

2

Challenger Spacecraft

- Jan 27th 1986
- O rings failed
- Became brittle under 53 Degrees F

3

Ford Explorer and Firestone Tires

- 1990, Ford introduced new explorer
- Tires delaminate at speed (due to flexing and lack of common reinforcement)
- Ford: Firestone bears sole responsibility

4

Ocean Ranger

- Drilling of east coast 1982
- Ballast control room flooded a porthole 28' above waterline
- Inquest poor training, insufficient safety, equipment design flaws

5

Ignoring Safety Measures

- Trends in road safety have improved from ENG design

6

Laval Overpass

- Sept 2006
- Overpass collapsed, killing 5 people and injuring 6
- Maintenance was overlooked in the building process of the design

7

Chernobyl

- April 1985
- 30 km deadzone, 10k casualties
- Runaway reaction and nuclear meltdown
- Poor training, design flaws

8

What is safe?

- Deemed safe is the risks are judged and acceptable
- Judgement can be formalized by laws and regulations
- Judgement is not always formalized, as your judgement also counts
- Override aim is to protect public safety

9

Hazard

- The consequence of an event
- eg. Disease, technological failure, accidents, sociopolitical

10

Risk Assesment

- Weighing the risk vs hazard
- What is deemed acceptable?
- Cost Benefit analysis: What is a life worth?