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Knowledge of blast resistant and venting walls in explosion-proof renovation construction

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| 2020-09-28|Return

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 in such areas due to various uncontrollable factors. Installing and using blast resistant walls, blast resistant doors and windows, as well as blast relief walls, doors and windows, is a safe and effective method. Below, Zhongnuo Testing will briefly introduce the application and installation engineering of blast resistant walls and explosion relief walls.

1、 Explosive release wall

1The application of blast walls

Explosion proof wall construction is used in areas with potential explosion hazards. These types of walls can be built separately or based on existing building walls, with explosion venting accessories or devices that open the walls to release 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 shock wave and pressure generated by the explosion and the threat to the main building structure, while controlling the direction of flames and shock waves during the explosion.


2The application locations of blast walls include:

(1) Large warehouse fire prevention area

(2) Substation and generator room

(3) Oil storage and chemical raw material storage area

(4) Production area of chemical plant workshop

(5) Pharmaceutical factory

(6) High tech electronic factory control room

(7) High value and important document databases

(8) Any area with high risk that requires fire prevention and aging


3Characteristics of explosion relief walls:

(1) Rapid venting: The venting plate itself has a relatively fragile structure and can achieve venting in a very short time, effectively reducing the explosion pressure.

(2) Less likely to cause secondary injury during venting: The venting plate is in a powder form without sharp edges, has a low weight, and is set in a direction without personnel or equipment, 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 resistance: In the initial design scheme, 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 and achieve pressure relief function.

4Application of explosive hazardous areas with blast walls

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 splatter outwards. During the explosion, the pressure impact and the impact of fragments often cause huge damage to human health and property. The application of blast walls is to quickly dissipate some components in the building to relieve critical pressure, while also controlling the fragments of the explosion, greatly reducing the impact pressure and damage to the human body caused by the fragments.


5Introduction to the installation process of blast walls

When constructing the blast wall, it is necessary to first position the axis, then fill the skeleton with rock wool according to the keel frame. When applying paint, fill the gaps on the bottom layer of the board first, then apply a layer of elastic waterproof putty on the wall, and finally apply a layer of fireproof paint.


At the beginning of the design, it is necessary to reserve openings for doors and windows. If the openings are large, double keel interlocking can be used to enhance their strength. Reasonable construction of blast walls will greatly reduce accidental injuries and losses caused by explosions, so it is necessary to install and equip according to standards in the current construction field.


2、 Blast resistant wall

1Application of blast resistant walls

Anti explosion walls are applied between explosive hazardous areas and safe areas, separating the two. They are used to isolate the flames and shock waves generated by explosions outside the safe area in the event of an explosion hazard, protecting the safety of personnel and equipment behind the walls. Anti explosion walls can be built separately or based on the original 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 sites 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 factories, paper mills, pharmaceutical production, chemical production, transportation and storage processes.


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 keel density, fix the keel with expansion screws or chemical bolts on the original walls of the building, fix the blast resistant panels with bolts and cables inside and outside the keel, and fill rock wool between the internal and external blast resistant panels to enhance fire resistance. The exterior of the explosion-proof board is coated with wall paint. If it is used as the exterior wall of a building, waterproof treatment or decoration should be applied to the exterior wall. If it is used as the interior wall, fireproof coating should be applied.

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