Control system
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Regarding the retention period for historical trends in petrochemical control systems, apart from the requirement specified in 3092-2013 that a retention period of no less than 180 days is necessary, are there any other standards that impose requirements in this regard? I mainly remember that when some experts came to conduct an inspection, they mentioned that it’s sufficient for historical trends to be retained for no less than 30 days; I just can’t recall which standard stated this. If you know, please let me know. Thank you!
Apart from the requirement stipulated in standard 3092-2013 to retain data for no less than 180 days, there are currently no other official regulations in China that specify the retention period for historical trend data of control systems. However, in engineering practice, the retention time for historical trends is usually determined based on process, equipment, and management requirements, and can be adjusted flexibly according to actual conditions. A 30-day retention period may be required for certain projects, but it is not applicable to all of them. During the project design or acceptance phase, the retention period for historical trends should be set reasonably based on specific circumstances, and adjusted dynamically during operation. .
For major hazard sources, records of parameters such as temperature and pressure are required for more than 30 days; no such records were found for the instruments in other locations either. Generally speaking, 30 days is the required period. Now the storage capacity of DCS is also large; 90 days is no problem at all. It depends on what the experts think.