Combustible and toxic gas detection system (GDS)
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The combustible gas and toxic gas detection system (GDS) is an independent system centered around a PLC with an SIL rating; who knows the regulations in this area?
The safety supervision agency requires independence from DCS, but looking at the built-in systems that are toxic and flammable, where do they have performance standards that exceed those of DCS? Expert advice was sought specifically on this matter from those who provide technical support to the safety supervision agency; the expert opinion is that flammable and toxic instruments should be placed in I/O cards that are separate from the process control system, with separate alarm display screens. In other words, the requirements in the specifications can still be followed.
We have also consulted experts from the Safety Supervision Bureau; it is possible to use DCS as well. However, this is only an oral explanation at present – the Safety Supervision Bureau does not have any official written guidance on this matter. It was said last time that such written guidelines would be issued in June. But for now, we’re still mainly entering DCS, and we’re waiting for news as well.
It is worth discussing whether the legal validity of regulations issued by the Work Safety Administration can be higher than that of the standard systems issued by the Standardization Committee.
I’ve learned something. Today I happened to encounter this situation: the expert talked there for ages, using the term GDS throughout, without explaining what GDS means to us beginners.
Let’s learn about it; I’m not sure if there are any explanations available now
Sorry, it should be clause 5.4.1.