Which signals from the ethylene plant PID diagram go into the safety instrumented system?
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This post was last edited by jacob451 on 2010-10-27 at 13:17. Purpose: To identify the safety instrument systems in the ethylene industry and then calculate the system reliability. The only available information is the PID diagram. May I ask the experienced colleagues how to identify the safety instrumented system from a PID diagram? I study chemical engineering and am not familiar with instruments; thank you all for your guidance. .
Reply to 1# Honghong, come on. What does it mean to “find SIS from PID”? You want to know which signals from the PID go into the SIS, right?
Look at the legend; the instrument labels for the safety system should be different
Reply to 2# jacob451: Yeah, that’s exactly what I mean. .
Reply 3# Xiphos: I found the symbol for safety instruments in the legend; thank you very much.
The representation of the signals in the flowchart where the design institute is located varies depending on whether they are involved in ESD; generally, numbers or an ‘s’ are added inside a diamond shape to indicate that the signal is involved in ESD