In various explosive hazardous areas, in addition to installing and using explosion-proof electrical equipment with valid explosion-proof certificates, we also need to consider how to minimize the losses caused by explosions due to various uncontrollable factors in such places. Installing and using blast resistant walls, blast resistant doors and windows, and explosion venting walls, doors and windows, etc. is a safe and effective method. Below, Zhongnuo Testing will briefly introduce the application and installation engineering of blast resistant walls and blast venting walls.
1、 Explosion wall
1Application of Explosion Wall
Explosion proof wall construction is used in areas with potential explosion hazards. This type of wall can be built separately or based on the existing building wall. Its explosion-proof accessories or devices open the wall to release the pressure in the area and minimize the damage caused by the explosion. The purpose is to reduce the pressure in the limited space of the explosion area during the explosion, reduce the threat of shock waves and pressure to the main building structure caused by the explosion, and control the direction of flames and shock waves during the explosion.
2The application places of explosion-proof walls include:
(1) Large warehouse fire prevention area
(2) Substation and generator room
(3) Oil storage and chemical raw material storage area
(4) Chemical plant workshop production area
(5) Pharmaceutical factory
(6) High tech electronic factory control room
(7) High value and important document database
(8) Any high-risk area that requires fire prevention time limit
3Characteristics of Explosion Wall:
(1) Rapid explosion release: The structure of the explosion release plate itself is relatively fragile, and it can be released in a very short time, effectively reducing the explosion pressure.
(2) Easy to cause secondary injury during venting: The venting plate is in powder form, without sharp edges, has a low weight, and is set in a direction where there is no personnel or equipment passing through, so it will not cause secondary injury.
(3) Good fire resistance: The explosion-proof wall is filled with A-grade rock wool, which has good fire insulation performance and a fire resistance limit of up to 4 hours.
(4) Wind pressure resistance: In the initial design plan, data such as external wall wind pressure and wall height will be combined to arrange purlins, keels, bolts, and pressure relief plates to ensure stability while achieving pressure relief function.
4、Application of Explosion Wall in Explosive Hazardous Areas
If an unexpected explosion occurs, a very strong impact pressure will be generated, and at the same time, the impact force will shatter some objects into fragments and scatter them in all directions. During the explosion process, it often causes huge losses to human and property due to the pressure impact and the impact of fragments. The application of blast walls is to quickly release some components in the building to relieve critical pressure, while also controlling the fragments of the explosion to a certain extent, greatly reducing the impact pressure and the harm caused by the fragments to the human body.
5Introduction to the installation process of explosion-proof walls
When constructing the explosion-proof wall, the axis should be positioned first, and then the skeleton should be filled with rock wool according to the keel frame. When applying the coating, the gaps in the bottom layer of the board should be filled first, and then a layer of elastic waterproof putty should be applied to the wall surface. Finally, a layer of fireproof coating should be applied.
At the beginning of the design, it is necessary to reserve openings for doors and windows. If the opening is large, a double dragon bone interlocking method can be used to enhance its strength. Reasonable construction of explosion-proof walls will greatly reduce the accidental injuries and losses caused by explosions, so they must be installed and equipped according to standards in the current construction field.
2、 Anti explosion wall
1Application of blast resistant walls
Anti explosion wall is applied between explosive hazardous areas and safe areas to isolate the two. It is used to isolate the flames, shock waves, etc. generated by the explosion outside the safe area in the event of an explosion hazard, protecting the safety of personnel and equipment behind the wall. Anti explosion walls can be built separately or relying on the existing load-bearing walls and exterior walls of the building.
2Characteristics of blast resistant walls
(1) Having good structural strength, it can ensure that its own structure is not damaged in the event of an explosion, in order to protect personnel and equipment behind the wall.
(2) It can be used as a partition or exterior wall in daily use.
(3) Has good fire and flame resistance performance.
3Application places of blast resistant walls
Anti explosion walls are widely used in various explosive hazardous areas, such as oil depots, chemical plants, grain and feed factories, cotton and linen clothing production plants, paper mills, pharmaceutical production, chemical production, transportation and storage processes, etc.
4Introduction to the installation process of blast resistant walls
When installing blast resistant walls based on the original walls of the building, it is necessary to first design the density of the keel, fix the keel on the original walls of the building with expansion screws or chemical bolts, fix the blast resistant board inside and outside the keel with bolts and ropes, and fill rock wool between the inner and outer blast resistant boards to enhance fire resistance. The exterior of the blast resistant board should be coated with wall paint. If it is used as an exterior wall of a building, waterproof treatment or decoration should be added to the exterior wall. If it is used as an interior wall, fireproof coating should be applied.
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