Should an HH alarm interlock display be included in the safety interlock system of PID?

2022-08-04View Original

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Dear fans of Chuan, should the safety interlock system include an HH alarm interlock display in PID? Is it meant to be like TZS, or TZSHH? If it is TZSHH, then what is the difference between HH in TZSHH and HH in TIAS of DCS? I hope fellow netizens can answer questions and provide clarifications!

Reply #22022-08-04

Thank you very much for providing valuable feedback!

Reply #32022-08-04

Would it be feasible to represent SIS using TZI?

Reply #42022-08-04

Refer to Section 6.3 of the standard HG/T 20505 – the interlock set values for the two are different.

Reply #52022-08-04

As shown in Figure 6.3, it is TZSHH; therefore, the SIS system does not need to issue an alarm, but only needs to take action directly.

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Should an HH alarm interlock display be included in the safety interlock system of PID?

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