Exercises 14

For this exercise the following parameters are given:

Parameter

Value

Comment

λDU

3E-07

Rate of DU failures (per hour)

τ

730 ⋅3

Proof test interval in hours (=3 months)

β

5%

Intially β = 0

Consider a 2oo3 configuration

Problem 1

Find PFD by standard formulas when β = 0.

Problem 2

Find PFD by standard formulas when β = 5%.

Problem 3

Find PFD by Markov Analysis when β = 0.

Problem 4

Find PFD by Markov Analysis when β = 5%.

Problem 5

What will be the reduction in PFD if we change the configuration to a 2oo4 system (β = 5%)?