Must the emergency stop signal to the compressor be a hard-wired connection?
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There are hydrogen compressors in the compressor room, and hydrogen detectors are installed in that room; if a detector detects a hydrogen leak, it will shut down the compressors. Is it necessary for the emergency stop signal sent from the GDS system to the compressors to be transmitted via a wired connection? Can we skip the communication? Which standard specifies that a wired connection must be used?
It should still be considered from a safety perspective, to ensure that a signal is sent to stop the operation promptly in case of any issue. Moreover, the transmission of some data can now be done wirelessly, but it is generally not very important. It’s hard to say what the future trends will be; for now, wired connections remain the more reliable option. It’s just my personal opinion – there’s no formal basis for it, just some thoughts; P
1. GBT 50770-2013 Code for Design of Safety Instrumented Systems in Petrochemical Industries stipulates that communication signals should not be used as input signals for safety instruments. 2. GB T 50493-2019, the Design Standard for Detection and Alarm of Flammable and Toxic Gases in the Petrochemical Industry, specifies that flammable and toxic gas detectors can be connected to three systems depending on their intended use: the traditional GDS ； Used for fire linkage to connect with dedicated combustible gas alarm controllers and fire alarm controllers ； Entry into the Safety Instrumented System for safety interlock signals. According to your description, the H2 detector should be integrated into the safety instrument system for interlocking. 3. It is necessary to conduct HAZOP\LOPA\SIL analyses to determine whether the H2 alarm should be interlocked with the compressor.
Haha, my reply was just a starting point to bring up what Yu mentioned above. Well worth it; it’s well-founded and backed by sources – professional!
Thank you! Thank you! Regarding point 2, this diagram is specified for the first time in the new standards, and there are doubts about including such a diagram in the standards. Essentially, a gas alarm system is designed solely for issuing alerts, and it is specified that it cannot be used for other functions; if such other functions are required, another identical sensor must be installed to form a circuit. The regulations seem a bit inappropriate in this regard.