Seeking guidelines for the installation of toxic and flammable gas detectors
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Hello, experts. I am currently working on setting up toxic and flammable substances, but I don’t fully understand the relevant regulations. I hope the experts can give me some guidance. Regarding the inspection of H2 on the factory roof, do anyone have any good suggestions or ideas? Please share your insights. Is a large-scale installation required to ensure full coverage at the top? Or should it only be installed at the plant’s discharge point? How is a dead corner in a factory defined? Also, I hope that the expert passing by can share some materials; it would be great if they could introduce foreign standards – just providing the standard numbers will suffice, so that I can find the electronic versions and share them with you.
GB 50493-2009 \"Code for Design of Detection and Alarm Systems for Flammable and Toxic Gases in Petrochemical Industries\"
1. Detection and alarm systems for gases and toxic gases – there is a standard, the \"GB50493-2009 Design Code for Detection and Alarm Systems of Flammable and Toxic Gases in Petrochemical Industries\", which provides detailed specifications on this topic. 2. As for the compressor building and the placement of hydrogen detectors, clause 4.2.3 on page P35 of the standards provides clear instructions regarding flammable gases that are lighter than air, especially hydrogen. First, it is necessary to distinguish the structural types of factory buildings, which are divided into three categories: enclosed, semi-open, and open (or unenclosed). a. A closed system is required; one should be installed above the leakage point ； A roof also needs to be installed when there is a possibility of accumulation on it. As for the setting range, it is the same as the range specified earlier. b. Semi-open factory building: A structure needs to be installed above the leakage point ； A roof is also required when there is a possibility of accumulation on it; if there is no such possibility, then no roof is needed. c. An open type is not required, as there is no possibility of accumulation. 3. Semi-open factory buildings: These generally refer to structures whose sides are not completely enclosed, with only a partial enclosure on top to provide protection from rain. There is a roof, but it has two types of mechanisms: the ridge of the roof is separated from the roof surface by a certain distance and is not sealed to it; this serves to prevent the accumulation of gases. It is very important to distinguish the structural types of compressor buildings; once this is done, one can then refer in detail to the provisions specified in the standards.
You explained it in great detail; I just want to look at more information. The specifications have also been reviewed. However, I feel that the regulatory requirements are quite comprehensive, but following them entirely results in a rather broad scope. For example, what is the definition of a large flange? If it’s CO or H2, due to the small measurement range, every point needs to be measured, which results in a very large instrument. How should this be handled?
This post was last edited by “Malaysia with a big bow” on July 6, 2016, at 11:22. Thank you; I’ve read it. However, my understanding isn’t deep enough, as I lack experience