Probability of failure is 0 because the process is down? My devices cannot fail between batches? Does the PFD equation not come from integrating the probability of failure over a time period for the purpose of capturing the accumulated failures over that time period?? I can see how you could adjust the initiating event frequency based on downtime or use a time at risk modifier for something like this but I don’t think it’s appropriate to account for this in the PFD calculation
Probability of failure is 0 because the process is down? My devices cannot fail between batches? Does the PFD equation not come from integrating the probability of failure over a time period for the purpose of capturing the accumulated failures over that time period??
I can see how you could adjust the initiating event frequency based on downtime or use a time at risk modifier for something like this but I don’t think it’s appropriate to account for this in the PFD calculation