Spacing issues in Class C workshops after the installation of cabinet rooms
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According to GB50160-2018, the cabinet room can be considered a secondary critical facility throughout the plant. As per Table 4.2.12, the minimum distance required between it and Class A process units is 35 m, while the distance between Class A and Class C units is 20 m. According to 5.2.16: “The control rooms, cabinet rooms, substation areas, laboratories, offices, etc., of the installation shall not be located in the same building as rooms containing Class A and Class B A equipment.” When the control room of the facility is built together with other buildings, an independent fire compartment should be provided.” According to 5.2.17: “The control room, laboratories, offices, etc. of the facility should preferably be located outside the facility itself, and it is advisable to have them arranged in a unified manner on a plant-wide or regional scale.” When the control room, cabinet room, substation, laboratory, offices, etc. of the facility are located within the facility itself, they should be placed on one side of it, outside the area at risk of explosion, and preferably on the downwind side of the direction in which flammable gases, liquefied hydrocarbons, and Class A and B equipment are most frequently blown throughout the year. According to the regulatory requirements, the cabinet room can be located at one end of a Class C facility. However, according to Interpretation (3) of the regulations, important facilities within the installation (such as control rooms, power transformation and distribution stations, office buildings, etc.) have their fire separation distances from adjacent installations determined in accordance with Class A fire hazard units. According to this explanation, if a cabinet room or similar is installed in a Class C facility, would the Class C workshop be upgraded to a Class A workshop, and would this determine the spacing requirements?
According to the specification requirements, the cabinet room can be located at one end of the Class C equipment, but the following conditions must be met: 1. The cabinet room should be situated on the side of the Class C equipment, on the downwind side of the direction in which flammable gases, liquefied hydrocarbons, and Class A/B equipment are most frequently blown during the whole year. 2. If the cabinet room is adjacent to a Class A installation, it is necessary to meet the minimum distance requirement between the Class A installation and the cabinet room, which is 35 meters. Therefore, if facilities such as cabinet rooms are installed in a Class C workshop and the above requirements are met, it will not cause the Class C workshop to be automatically upgraded to a Class A workshop. Only when the fire separation distances between critical facilities in Class C workshops and Class A installations do not meet the requirements is it necessary to determine the fire separation distances between adjacent installations according to Class A fire hazard units. .
A device is a device, and a workshop is a workshop – clarify the concepts first! ! ! ! This chaotic practice of violating standards and making improper citations has trapped countless companies; when will it end? ? ?
Thank you, so it’s necessary to have a deep understanding of the standards! The problem is that each unit in our organization reports based on devices, and now we’re facing issues!
The distance between Class A and Class C workshops is 20 meters, but if a cabinet room is installed in the Class C workshop, then the distance between Class A and Class C workshops must be increased to 35 meters?
This provision can be understood in reverse: the cabinet rooms in Class C workshops cannot be built within the explosion-proof separation areas designated for Class A and B installations. The purpose of such a regulation is to prevent people from thinking that, just because it is a Class C equipment area, there is no need to consider the surrounding environment. .