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Transcript
  • ETA
  • FMECA
  • FTA
  • FMEA

RISK ANALYSIS METHODS

vs

  • DRBFM
  • HAZOP
  • HACCP
  • PhA

...

Emma Jantošovitšová

FTA

Event symbols

Transfer symbols

Gate symbols

FTA

  • deductive
  • top-down

Disadvantages

Advantages

ADVANTAGES

DISADVANTAGES

  • difficult to estimate the state of partial failure
  • limited in modeling dynamic complex systems
  • easy-to-read
  • potential failure parts of the process seen in detail
  • identifies events which lead to a specific process failure

FMEA

FMEA

  • inductive
  • bottom-up

ADVANTAGES

DISADVANTAGES

Advantages

Disadvantages

  • examines every element
  • helps discover missing or wrong requirements
  • detects end effects caused by one failure mode
  • catches only end effects which result from failures
  • multiplication of the S, O, D rankings may result in rank reversals

FTA

FMEA

  • analyse the effects of single component or function failures on equipment or subsystems
  • analyse the effects of initiating faults and events on a complex system

  • dismisses external events
  • considers external events
  • does not consider partial failures
  • does not consider unexpected failures
  • requires constant updating
  • easy to update
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