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1. Detectors shall be installed within the fire dike of liquid storage tanks that produce flammable gases, such as liquefied hydrocarbons, Methane B, Ethane A, and liquid-like substances. The horizontal distance between a combustible gas detector and any source of release within its coverage area should not exceed 10 m. The horizontal distance between a toxic gas detector and any source of emission within its coverage area should not exceed 4 m. 2. For facilities for loading and unloading liquefied hydrocarbons, Methane B, Ethane A, and liquid-like substances, the installation of detectors shall comply with the following requirements: ① At railway loading and unloading platforms, it is advisable to install one detector at each parking space on the ground, and the horizontal distance between the detector and the loading/unloading port shall not exceed 10 m ； ②The horizontal distance between the loading/unloading positions at the vehicle loading/unloading station and the detectors should not exceed 10 m. The placement of detectors in the pump or compressor areas of the loading/unloading facilities shall comply with the provisions of Section 4.2 of this standard. 3. The detector installation at liquefied hydrocarbon filling stations shall comply with the following requirements: ① In enclosed or semi-enclosed filling rooms, the horizontal distance between the filling port and the detector should be between 5 m and 7.5 m ； ②Closed or semi-open bottle storage areas shall comply with the provisions of Article 4.2.2 of this standard ； In an open-type bottle storage area, a detector should be installed every 15m to 20m along the perimeter; if the total perimeter length is less than 15m, one detector should be installed ； ③The horizontal distance between the drain outlet or valve assembly of the buffer tube and the detector should be 5 m to 7.5 m. 4. In closed or semi-open hydrogen filling rooms, detectors should be installed at high points inside the room above the filling port, where gases tend to accumulate. 5. At loading and unloading docks where flammable gases may be released, a detector should be installed within 10 meters of the horizontal plane of the oil transfer arm. 6. For other storage and transportation facilities for flammable gases and toxic gases, flammable gas detectors and/or toxic gas detectors shall be installed in accordance with the provisions of Section 4.2 of this standard.