【Weekend Share-21】How to determine the installation height of flammable and toxic gas detectors?
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1. How to determine the installation height of flammable and toxic gas detectors? 【Answer】Installing according to the 666 principle will avoid errors (install at 0.6m above the ground when it is heavier than air, 0.6m below the release source when slightly heavier than air, and 0.6m from the release source when lighter than air), but if conducting inspections, it is necessary to keep more detailed records. [Reference] According to Article 6.1.2 of the \"Design Code for Detection and Alarm of Flammable and Toxic Gases in Petrochemical Industries\" (GB50493-2019), when detecting flammable or toxic gases that are heavier than air, the installation height of the detectors should be between 0.3m and 0.6m above the floor level (or floor of a building) ； When detecting flammable gases or toxic gases that are lighter than air, the installation height of the detector should be within 2.0 m above the source of release. When detecting flammable gases or toxic gases that are slightly heavier than air, the installation height of the detector should be between 0.5 m and 1.0 m below the source of emission ； When detecting flammable gases or toxic gases that are slightly lighter than air, the installation height of the detector should be 0.5 m to 1 m above the source of emission.
When determining the installation height of flammable and toxic gas detectors, an appropriate installation location should be chosen based on the specific gravity of the gas (its weight relative to air). This is because gases with different densities have different heights of distribution in space. Here are the specific installation instructions: 1. **Gases heavier than air**: Such gases will accumulate in the lower parts of a space. According to the \"Design Code for Detection and Alarm of Flammable and Toxic Gases in Petrochemical Industries\" (GB50493-2019), the installation height of detectors should be between 0.3m and 0.6m above the ground level or floor surface. 2. **Gases lighter than air**: Such gases rise to higher areas. The detector should be installed no more than 2.0 m above the source of release. 3. **Gases slightly heavier than air**: These gases are slightly denser than air and remain at lower levels, but not right at the ground level. The detector should be installed 0.5 m to 1.0 m below the release source. 4. **Gases slightly lighter than air**: These gases are slightly lighter than air and remain at a higher level, but not right against the ceiling. The detector should be installed at a height of 0.5 m to 1.0 m above the release source. By following these guiding principles, various types of flammable or toxic gases can be effectively monitored to ensure safety. .