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Article 7.2.15 of the \"Code for Fire Protection Design of Petrochemical Enterprises (2018 Edition)“ (GB 50160-2008) stipulates that for equipment handling liquefied hydrocarbons and flammable liquids with an operating temperature equal to or above their auto-ignition point, a shut-off valve shall be installed on the pipeline leading from the equipment to the pump, near the base of the equipment. When the volume of the equipment exceeds 40 m3 and the distance between it and the pump is less than 15 m, such shut-off valve shall be a remotely operated valve with a manual function; the distance between the local operation button of this remotely operated valve and the pump shall not be less than 15 m. Question: 1. Which devices, other than storage tanks, are referred to in this clause as liquefied hydrocarbons and combustible liquid equipment with an operating temperature equal to or above their auto-ignition point? . For example, in the case of the feed tank for the depropanization tower in a gas separation unit, when the distance between it and the pump is less than 15 meters, does this 15-meter distance refer to the length of the pipeline, the horizontal distance, or the straight-line distance? If the feed tank for the depropanization tower is located on the second floor platform while the feed pump is located on the first floor, how should this distance be calculated?