Laboratory is different from general building or interior design. Whether ventilation or fire and explosion protection, safety is an indispensable consideration in its design. So how to design a safe and reasonable laboratory exit channel? This is an introduction.
Safety evacuation facilities include safety exits, evacuation stairs, evacuation doors, evacuation corridors, emergency lighting, smoke isolation and smoke exhaust facilities, safety indicators, etc. There is no doubt about the importance of laboratory safety. Firstly, the laboratory should keep ventilation and escape passage as smooth as possible. The indoor passage of the laboratory must be designed reasonably, and the workspace should not be designed in irregular shape. Consideration should be given to the number, width and direction of entry and exit for personnel.
Indoor passage: The net width of main passage in test area is 2000 mm-2500 mm, and the main passage between test bench or equipment is more than 1200 mm.
Export quantity: It is determined by the level of risk coefficient, the quantity of dangerous equipment and the severity of laboratory.
The width of double open door in common laboratory is 1200 mm-1500 mm (asymmetric open door), and the width of single open door is 800 mm-900 mm.
Opening direction: All opening directions should not prevent people from panicking; at the same time, opening an open door is easier than opening an open door. If there is a room with explosion danger, the door should be opened outwards. The best material for the door is pressure glass. In order to facilitate evacuation in case of work danger, all passages between test benches should lead to corridors.
In addition, the main channel should lead to the direction of the exit. Laboratory accidents are often accompanied by smoke and gas. In case of emergency, climbing out of the laboratory along the ground may be too late to overcome smog and gas escaping from the laboratory smoothly, irregular channels or unreasonable outlets.
The key to safe evacuation is "fast": when the concentration of carbon monoxide in the air is 0.05%, if people stay for three hours, they will be in danger of life. When carbon monoxide concentration is 0.15%, it is dangerous to live for one hour. When the concentration of carbon monoxide is 0.40%, it will die after one hour. But when the concentration of carbon monoxide is about 1.30%, if people inhale how many mouths, they will lose consciousness and become seriously poisoned, which is difficult to rescue.
When the concentration of carbon dioxide in the air rises to about 10%, people die in a few minutes. When the oxygen content in the air drops to about 12%, people lose their judgment. When the oxygen content is low (about 8%), it can cause the death of syncope. High temperature (such as above 150 C) can destroy the brain nerve center and blood circulation system, leading to death. Therefore, according to the degree of fire hazard and different working conditions, it is generally required to achieve safe evacuation in 1.5-5 minutes or less.