Instrument PFD issue
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I have a question: how can the average failure rate PFD of instruments that do not have SIL certification be estimated? Is there anything I can refer to? (The instrument has been in use for 4 years, and the manufacturer’s information is unavailable) Thank you very much!
This post was last edited by Yunmu on 2019-3-26 at 12:35. Industry databases can be used for this purpose; the IEC61511-2016 standard allows the use of industry data for estimation, and such databases include E*DA, OREDA, etc.
If you have enough data from your factory, you can use your own company’s data. It’s actually impossible; the sample size is too low. The data from instrument manufacturers can also be used. There is also an issue with the reliability of the data. . Unless the manufacturer also provides maintenance for your organization. In the end, the only option is to use industry databases such as e*da, ORENDA, and other similar databases.
Can’t tables that have been in use for a long time be used as evidence? In that case, the SIL level will decrease over time
Same question. I also have a question: Many people say that systems, instruments, etc. do not necessarily require SIL certification; it is sufficient to provide the relevant parameters so that the overall system coefficient meets the requirements of the desired SIL level. I would like to ask who determines the device parameters? Is it determined by the manufacturer, or is a SIL certification required?