The following key figure tables provide an example of safety-related figures for the different
versions. Complete data records of safety-related figures of all variants are available within
the exida test report. For the relevant figures, refer to the pertaining order-related Declaration
of Incorporation.
When determining the PFD values, please note that the stipulated proof test cannot fully
restore the system. For this reason, the following data is used for calculation:
• PTC = 90 % (proof test coverage rate [%])
• T1 = 1 year (proof test interval [h])
• T2 = 10 years (requirement interval = lifetime [h])
• MRT = 72 hours (mean repair time [h])
• Td_ESD = 730 hours
(diagnostic test interval of actuator monitoring (for safety function Safe ESD [h])
• Td_ESD_AVG = 365 hours (mean duration for failure detection)
• Td_STOP = 0 hours (diagnostic test interval [h])
• MTTR_ESD = 437 hours
• MTTR_STOP = 72 hours
The following formula can be used for the calculation of the PFD values:
avg
Table 10: SA series with EPAC controls in SIL version
1) including detected "annunciation" failures (λ ) (failures in diagnostic function)
AD
Table 11: SAR series with EPAC controls in SIL version
1) including detected "annunciation" failures (λ ) (failures in diagnostic function)
AD
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