Understanding of regulations for flammable and toxic gases
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4.2.3 When the source of flammable or toxic gases that are lighter than air is located in a closed or semi-open facility with poor local ventilation, in addition to installing detectors above the source of release, detectors for flammable or toxic gases should also be installed at the highest points in the facility where gases tend to accumulate. (The \"Design Code for Detection and Alarm of Flammable and Toxic Gases in Petrochemical Industries GB50493-2009\") provides the following explanation for this clause: \"4.2.3 This clause deals with the detection of flammable gases and toxic gases that are lighter than air, such as hydrogen. When the source of emission is located in an outdoor area or within the equipment area of an open-type factory building where ventilation is good, no detectors are required based on on-site investigations and the characteristics of the installed equipment.\" ” (《Explanations to the Code for Design of Detection and Alarm Systems for Flammable and Toxic Gases in Petrochemical Industries GB50493-2009》) May I ask: \"Based on on-site investigations, no detectors are required for either the existing installations or those to be introduced.\" ”How should this sentence be understood, and what does “introduce a device” mean? What should be done in practice?
Is it determined based on an on-site investigation whether to install a detector or not? Can a detector be omitted for any installed device?
It’s so hard to understand – how is this specification written?
Anyway, most of the drawings produced by the design institute are designed in accordance with regulations, but they do not meet the installation requirements. We have a small factory building, and we need to install 40 alarm devices. It’s already impossible to do so even with conduit pipes – are we supposed to give up?
It refers to two situations: equipment located in enclosed or semi-open workshops with poor local ventilation, and equipment located in outdoor or open workshop areas; these two situations are not contradictory.