What is the distance between the acidic wastewater tank and the cabinet room?

Explanatory notes 5.2 Layout within the installation 5.2.1 The main principles and criteria for determining the items in Table 5.2.1 of this code and the fire separation distances are as follows: 1 In line with Chapter 3 “Classification of fire hazard” of this code. 2 It is in accordance with the following provisions of the current **standard, ‘Code for Design of Electrical Installations in Explosive and Flammable Environments’ GB 50058: 1) Source of release, that is, the location where substances that can form explosive mixtures may be released ； 2) The range of explosive hazard areas is 15m. 3 Draw on the applicable parts of relevant foreign standards. The items and fire separation distances in Table 5.2.1 of these specifications are generally consistent with the relevant fire protection and layout regulations of most foreign engineering companies. 4 Fully consider the impact distance of a fire within the device and the diffusion range of flammable gases (the range where explosive gas mixtures may form). 1) The impact distance of a fire inside the device is approximately 10 m. 2) Diffusion range of flammable gases: (1) During normal operation, within about 3 meters around Class A and Class B process equipment ； (2) After a liquefied hydrocarbon leak, the diffusion range of flammable gases is generally 10–30 m ； (3) After a leak of Class A B or Class B A liquids, the diffusion range of flammable gases is 10–15 m ； (4) In the event of a leak of Class B or C liquids with an operating temperature equal to or higher than their flash point, the spread range of the flammable gas generally does not exceed 10 m ； (5) The horizontal diffusion distance of hydrogen generally does not exceed 4.5 m. 3) “Report on the Fire Protection Code for the UK Petroleum Industry”: In the gasoline wind tunnel test, the dispersion distance of oil vapor downwind was 12 meters. 5 Basis for determining the project: 1) Ignition source. Ignition sources mainly include open flames, red-hot surfaces, electrical sparks, static electricity sparks, impact and friction, chemical reactions, and spontaneous combustion due to heat generation. Based on the actual conditions of the process units in petrochemical enterprises, when determining the items in Table 5.2.1, open flames, red-hot surfaces, and electrical sparks are primarily taken into consideration; therefore, the following equipment or buildings are included in the table: (1) Equipment with open flames ； (2) Buildings such as control rooms, cabinet rooms, substation areas, laboratories, and offices are important facilities within the plant; they are also locations where open flames and sparks can arise. Some of them are places with a high concentration of people. Since their fire protection requirements are similar, they are grouped together as one category ； (3) Equipment whose operating temperature is equal to or higher than the auto-ignition point. 2) Release source. In accordance with the provisions regarding emission sources in the current **standard \"Code for Design of Electrical Installations in Explosive and Flammable Environments\" GB 50058, and taking into account the actual conditions of the process units in petrochemical enterprises, emission sources are classified into four categories based on different fire protection requirements: (1) Combustible gas compressors or compressor rooms ； (2) Unit storage tank ； (3) Other process equipment or rooms. (4) Oil separators and sewage tanks containing flammable liquids (with lids), acidic sewage tanks, and oily sewage tanks.