Replacement cycle for electrical components such as relays and fuses used in the SIS system
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As a safety instrument system commonly used in the petrochemical industry, the operational stability of the SIS system has a significant impact on the frequency of unplanned shutdowns of plants. Since the SIS system is designed as a fail-safe instrument system, the stability of electrical components such as relays and fuses directly affects the stability of the SIS system. Therefore, the question is: how can maintenance be utilized to inspect such electrical components? What is a suitable replacement cycle? I earnestly ask all the experts for their guidance~~~:handshake
Electrical and electronic components shall not be older than 15 years. If the degradation starts to increase after 10 years, it should be replaced.
The specifications do not specify this explicitly; you can consult the SIS integrator.
It seems there are no relevant regulatory requirements for this. It’s difficult to determine the condition of this electrical component without specialized equipment; it is recommended to replace it every 3–5 years, with the old ones can be used in other applications
Relays, fuses – when you \"inspect\" or \"check\" them, can you determine how much longer they will function before failing or breaking down? Who are you? ! The replacement cycle for control components is determined by the leadership! How can you possibly know what the leaders have in mind? Don’t waste your mental energy on pointless things, that’s all there is to it… Evaluation complete.
Original poster, my company’s plant came to a stop due to a failure in a relay within the SIS system at the end of last month; the system had been in use for less than 5 years, and as of now there is no decision yet regarding when it should be replaced.
The typical lifecycle for control systems is 10 years
Should a \"safety relay\" be chosen during the design phase then?
Yes, safety relays should be used for SIL circuits, as they offer better reliability than ordinary relays.