The fire protection area for Class A workshops exceeds the limit
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Hello, all the experts from HaiChuan； It’s a project I worked on: a Class A workshop with four floors of concrete, measuring 22m x 84m. Two fire compartments were arranged side by side, but the area exceeded the allowed limits. Ask whether it is possible to use only one layer of spraying to cover the extra area
From your description, is it the case? For Class A, Grade 1 multi-story factories, the standard floor area for a single fire compartment is 3,000 square meters; in your case, one fire compartment has an area of 22X84/2X4 = 3,696 square meters. According to your plan, by using only one layer of spraying, the additional area is 84X11=924,3696, which is less than 3924; therefore, this approach is feasible. However, the standard requires the installation of an automatic fire extinguishing system, not sprinklers; sprinklers are just one type of fire suppression device. It also depends on the materials used in your workshop – if they react to water, then another method must be used
Yes, it’s the situation you described. It is an automatic fire extinguishing system. Is it okay to do only the top row?
It is also possible to do it in just one layer, but usually the entire fire compartment is treated as a single unit.
It’s okay to use just one layer; I don’t understand. If we follow what the original poster suggested and install automatic fire suppression systems only on the top floor, then the two fire compartments on that floor won’t be a problem. But the six compartments in the three floors below would still exceed the allowed limit
“For the Class A workshop, the concrete structure has four floors measuring 22m x 84m; it is arranged east-west with two fire compartments. My understanding is that it’s similar to a character shaped like a Day, with the entire workshop being divided in half down the middle to form these two fire compartments. Thus, the area of each fire compartment is 22 x 84 / 2 x 4 = 3,696 square meters. Automatic fire suppression systems are sufficient for just one of these compartments. I haven’t encountered this situation very often; generally, workshop areas are divided into fire compartments based on natural floors, and if a division is made in the middle, fire barriers must be installed. And to be honest, installing automatic fire suppression systems throughout the workshop doesn’t require much investment, and it also saves the hassle of doing calculations
It seems that it’s not possible to do it just at one layer; the entire fire compartment needs to be treated as a whole.
Yes, it seems that just one layer isn’t enough; the entire fire compartment needs to be treated, that is, the whole workshop must be covered.
One is cost, and the other is that the Class A workshop is a fine chemical workshop with a large number of products and numerous pipelines, which makes things even worse at present.
Since it is a fine chemical industry, discuss with the owner regarding 8.3.1 in GB51283