The objective of explosion isolation is to protect interconnected parts in a process and prevent the explosion from propagating.
Many closed volumes, silos and equipment in processes are connected to each other by pipelines, pneumatic conveyors or aspiration lines. When a dust explosion occurs, the flames and pressure waves are emitted from these channels and connections to other parts of the process. Pre-compression and flame jet intensify the explosion in these interconnected volumes. The results are secondary explosions that can lead to even larger explosions and detonations.
An explosion isolation system prevents the spread of explosions and the occurrence of secondary explosions. Thus, it minimizes the negative consequences of explosion and protects the connected equipment in the process.
Isolation systems can be either active or passive.
The main equipment of isolation systems can be listed as follows;
Explotion isolation equipment can be used on a variety of process equipment. The main uses of these equipment can be listed as follows;
Passive isolation systems react mechanically to the direct physical pressure effect of an explosion, without requiring sensors, closing off the line to block the spread of flame and pressure waves. Active systems, by contrast, use detectors and sensors that continuously monitor pressure and sparks in the process, automatically triggering countermeasures when a hazard is detected.
The equipment used varies depending on the type of isolation. Active isolation systems typically employ chemical isolation and bidirectional mechanical valves.
These products are used in industrial facilities to protect a wide range of process equipment. Key application areas include pneumatic conveying systems, dust collectors, cyclones, bucket and chain elevators, mills, silos, fluid bed dryers, and spray dryers.
Passive isolation systems operate using the pressure wave generated by the explosion itself within the process, without requiring any external electronic intervention. When the pressure wave reaches the system, its components respond mechanically, closing off the line to stop the flame and pressure wave from spreading to other areas.
Sensors and detectors in active systems continuously scan and analyze pressure conditions and potential sparks within the process in real time. When a potential hazard or the onset of an explosion is detected, they trigger active isolation valves or suppression tubes within milliseconds to secure the system.
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