How PFD Value has been calculated in Table 2 of 3BSE034876-510 Rev A Reliability and Availability manual?
Just to understand it more clearly:
Can any one please share exact formulas used to calculate PFD Value shows in "Table 2. AC 800M HI Safety reliability data" of Document No. 3BSE034876-510 Rev A i.e. "AC 800M High Integrity Reliability and Availability" manual?
Appreciate if any one can also share one example showing PFD Value achieve as stated.
Can any one please share exact formulas used to calculate PFD Value shows in "Table 2. AC 800M HI Safety reliability data" of Document No. 3BSE034876-510 Rev A i.e. "AC 800M High Integrity Reliability and Availability" manual?
Appreciate if any one can also share one example showing PFD Value achieve as stated.
Asked 7 years ago
Answers
1
As per my best knowledge,
PFD = Lamda(DU) x T is used.
Where, T is 20 years i.e. 175200 hours (Ref. : AC 800M High Integrity Safety Manual 3BNP004865-514 Page No. 154)
Example,
For I/O DI880, where Lamda(DU) is 3.52E-11 and T is 175200 hours.
PFD = Lamda(DU) x T
PFD = 3.52E-11 x 175200
PFD = 6.16E-6, which is matching to Table 2 PFD Value.
Here 2oo2 voting simplified PFD Formulas is used. (Ref. : ISA-TR84.00.02-2002 - Part 2)
Can any one please confirm whether my understading is correct or not?
Answered 7 years ago
Source: ISA-TR84.00.02-2002 - Part 2
0
Formula for PFD Calculation is presened on the Safety and Reliability Calculation
3BSE034876-510 Rev A
Section 1 pge 21
Answered 7 years ago
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