The size of the community with blasting risk is the size of the region in which explosion risk concentration can form under normal circumstances, rather than the scale involved in the incident. BXQ51 Waterproof Explosion-proof Electromagnetic Starter BQD53 Explosion-proof integrated magnetic starter box In this area, equipment should be equipped with appropriate anti-blasting electrical equipment; blasting risk outside the scope of the scale, non-prevention type equipment can be used for electrical equipment. However, it cannot be based on the use of open flames or other sources of fire, because electrical equipment and other sources of ignition are still different. It is obviously unsafe to use an open flame within the blast risk area scale. Therefore, it is necessary to implement the open fire and other fire sources in the blast risk area and its neighbors in accordance with the fire criterion.
BQX52 explosion frequency control box (a) the risk of explosive atmospheres regional scale <br> <br> explosive gas atmospheres risk a regional scale, the level should be based on the release of the source and orientation, nature of the explosive substances, ventilation, Obstacles, production conditions, operating experience, etc. are concluded after technical and economic comparisons.
BQXB Explosion-Proof Variable Frequency Gearbox 1. Non-open buildings are in the interior of a building, usually in units of rooms. However, when the indoor space is large, the orientation of the source can be released and the amount of explosive gas released can be determined based on the ventilation. The decentralized scale divides indoor space into several areas as appropriate and determines its grade. For example, in the regular space scale of factory doors and windows, due to outstanding ventilation, it can be reduced by one level, as shown in Figure 6.4.2.1. However, when the room has a gas or vapor that is heavier than air, and there may be a gas or vapor that is lighter than air, it can also be distinguished from the room. Since it is heavier than air, it can form pits or dead spots where blasting gas or vapor accumulates in areas lower than the release source. When it is lighter than air, it can also constitute a blind spot above and below the release source.
2. Open or partially open for building <br> <br> open or partially open to distinguish regional scale buildings and structures (1) of flammable liquid, flash point less than or equal to ambient temperature properties In the flammable liquid injection station, the space where the outer edge of the open surface extends horizontally within 15m and extends straight upward within 3m shall be classified as a risk area. As shown in Figure 6.4.2.2.
(2) For flammable gases, flammable liquids, and flammable liquids with a flash point lower than or equal to the ambient temperature of the site, the space within 3 m (straight or horizontal) of the outer edge of the open face shall be zoned as Zone 2.
3. Device <br> <br> to open with combustible gas, flammable liquid, and a flash point of less than or equal to combustible liquid off equipment places ambient temperatures, usually within from 3M (straight and level) of the device housing Space should be classified as a risk area. When setting safety valve, breathing valve, vent valve, it is usually the space within 3m (straight and horizontal) outside the valve port as the risk area.
Flammable liquid tanks containing flammable liquids and flashpoints less than or equal to the ambient temperature of the site shall be classified as a risk area with a space within 3m of the horizontal or straight distance from the outer shell of the tank. When a dike is provided, the space within the height of the dike should be included. If the injection station is located, the space within the horizontal distance of 15m and the straight line within 7.5m will be used as the risk area.
4. The use of fire proximity device <br> <br> use fire risk areas in some devices, such as oil, gas boiler room temperature incineration chamber adjacent to the surface or beyond hot blasting member autoignition temperature of the mixture of the region ( Such as high-pressure steam piping, etc.) adjacent, non-explosion-proof electrical equipment can be used. In this case, fire protection and explosion protection are mainly adopted for sealing and anti-leakage measures. Since there are already open flames or high temperature objects that exceed the auto ignition temperature of blasting mixture in these areas, explosion protection of electrical equipment has not achieved its desired effect. .
5. explosion risk areas and adjacent areas <br> <br> on risk areas and blasting areas adjacent levels of distinction, should be based on the relative distance between them, the doors and windows open direction and orientation, ventilation, solid walls Incineration function and other elements are determined. When it is implemented in detail, it is necessary to make investigations and studies.
6. To distinguish release source <br> <br> example refers to the release of the source of explosion risk areas, it can be opened and material properties and orientation release location constituting explosive mixture. When the release source is determined, the size of the blasting risk area is a regular spatial area delimited by the release source.
BQX52 explosion frequency control box (a) the risk of explosive atmospheres regional scale <br> <br> explosive gas atmospheres risk a regional scale, the level should be based on the release of the source and orientation, nature of the explosive substances, ventilation, Obstacles, production conditions, operating experience, etc. are concluded after technical and economic comparisons.
BQXB Explosion-Proof Variable Frequency Gearbox 1. Non-open buildings are in the interior of a building, usually in units of rooms. However, when the indoor space is large, the orientation of the source can be released and the amount of explosive gas released can be determined based on the ventilation. The decentralized scale divides indoor space into several areas as appropriate and determines its grade. For example, in the regular space scale of factory doors and windows, due to outstanding ventilation, it can be reduced by one level, as shown in Figure 6.4.2.1. However, when the room has a gas or vapor that is heavier than air, and there may be a gas or vapor that is lighter than air, it can also be distinguished from the room. Since it is heavier than air, it can form pits or dead spots where blasting gas or vapor accumulates in areas lower than the release source. When it is lighter than air, it can also constitute a blind spot above and below the release source.
2. Open or partially open for building <br> <br> open or partially open to distinguish regional scale buildings and structures (1) of flammable liquid, flash point less than or equal to ambient temperature properties In the flammable liquid injection station, the space where the outer edge of the open surface extends horizontally within 15m and extends straight upward within 3m shall be classified as a risk area. As shown in Figure 6.4.2.2.
(2) For flammable gases, flammable liquids, and flammable liquids with a flash point lower than or equal to the ambient temperature of the site, the space within 3 m (straight or horizontal) of the outer edge of the open face shall be zoned as Zone 2.
3. Device <br> <br> to open with combustible gas, flammable liquid, and a flash point of less than or equal to combustible liquid off equipment places ambient temperatures, usually within from 3M (straight and level) of the device housing Space should be classified as a risk area. When setting safety valve, breathing valve, vent valve, it is usually the space within 3m (straight and horizontal) outside the valve port as the risk area.
Flammable liquid tanks containing flammable liquids and flashpoints less than or equal to the ambient temperature of the site shall be classified as a risk area with a space within 3m of the horizontal or straight distance from the outer shell of the tank. When a dike is provided, the space within the height of the dike should be included. If the injection station is located, the space within the horizontal distance of 15m and the straight line within 7.5m will be used as the risk area.
4. The use of fire proximity device <br> <br> use fire risk areas in some devices, such as oil, gas boiler room temperature incineration chamber adjacent to the surface or beyond hot blasting member autoignition temperature of the mixture of the region ( Such as high-pressure steam piping, etc.) adjacent, non-explosion-proof electrical equipment can be used. In this case, fire protection and explosion protection are mainly adopted for sealing and anti-leakage measures. Since there are already open flames or high temperature objects that exceed the auto ignition temperature of blasting mixture in these areas, explosion protection of electrical equipment has not achieved its desired effect. .
5. explosion risk areas and adjacent areas <br> <br> on risk areas and blasting areas adjacent levels of distinction, should be based on the relative distance between them, the doors and windows open direction and orientation, ventilation, solid walls Incineration function and other elements are determined. When it is implemented in detail, it is necessary to make investigations and studies.
6. To distinguish release source <br> <br> example refers to the release of the source of explosion risk areas, it can be opened and material properties and orientation release location constituting explosive mixture. When the release source is determined, the size of the blasting risk area is a regular spatial area delimited by the release source.
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