Räjähdysalttiuskohtia

Räjähdysalttiuskohtia, often translated as explosive atmospheres or hazardous areas, refers to specific locations where the presence of flammable substances in the air, combined with an ignition source, can lead to an explosion. These conditions are typically found in industrial settings, but can also occur in less common environments.

The presence of flammable gases, vapors, or dusts in sufficient concentrations is a key factor. These substances, when mixed with oxygen from the air, form a combustible mixture. The concentration of the flammable substance must be within its explosive limits, meaning it is not too lean (insufficient fuel) or too rich (insufficient oxygen) to ignite.

Ignition sources that can trigger an explosion in these areas include open flames, sparks from electrical equipment or static discharge, hot surfaces, and even mechanical friction. The energy of the ignition source must be sufficient to overcome the minimum ignition energy of the flammable mixture.

To manage the risks associated with räjähdysalttiuskohtia, various safety measures are implemented. These include the classification of hazardous areas into different zones based on the likelihood and duration of the explosive atmosphere being present. Equipment used in these zones must be designed and certified to prevent ignition, such as using explosion-proof enclosures or intrinsic safety techniques. Ventilation systems are crucial for diluting or removing flammable substances, and strict procedures for handling flammable materials and controlling ignition sources are enforced. Regular inspections and maintenance of equipment are also vital to ensure ongoing safety.