Fire & explosion protection for extraction systems and filtration equipment

Even in the quotation phase of our stationary filter technology, we focus on safety-specific issues, naturally in compliance with applicable laws, regulations and standards, such as DIN EN 12779 and DGUV 209-045. We always manufacture Schuko extraction systems and filter technology on a customer-specific and individual basis. As one of the few manufacturers, we use, for example, specially manufactured type-tested ATEX non-return valves according to DIN EN 16447. These are installed in the piping and prevent the spread of explosion pressure waves and the flashover of flames from the extraction and filter systems into production areas in the event of an explosion.

We distinguish in the following between measures for fire and explosion protection:

• EW90 FILTER HOUSING: Reduction of fire risk due to fire-resistant housing according to fire resistance class EW90 (analogous to fire resistance class F90).
• DRY EXTINGUISHING LINE: A dry extinguishing line with a standardised coupling is installed at an easily accessible point on the filter. The fire brigade can simply  onnect a fire hose here to extinguish a fire in the filter room via the pre-installed sprinkler system.
• SMOKE DETECTOR: Sensitive sensors detect smoke and report developing fires at an early stage, this renders the system inoperative.
• SPARK EXTINGUISHING SYSTEM (OPTIONAL): The system is used for preventive fire and explosion protection. It detects ignition sources in the ducting and eliminates them at an early stage by extinguishing them before they reach the filter system.
• FIRE PROTECTION FLAP: In the event of fire or explosion it automatically closes the return air ducts, thus preventing the transmission into the factory or workplace.
• BACKFLOW FLAP: It prevents dust and chip material from flowing back into the ducting and thus serves to prevent an increased risk of fire and explosion due to deposits.
• FIRE PROTECTION COLLECTION / CONVEYOR SYSTEM CLOSURE: In the event of a fire, it serves to seal off the pipeline if it passes through different fire compartments. The fire can no longer spread through the ducting.

• Two 90-DEGREE DEFLECTIONS: To prevent the explosion pressure from penetrating into the working spaces, two 90° deflections of the return air ducts ensure direct pressure decoupling.
• PRESSURE RELIEF SURFACES: In the event of an explosion, they ensure controlled and targeted dissipation of the pressure wave and the subsequent flame front.
• ATEX ROTARY VALVE: The ATEX-certified rotary valve is used to decouple pressure and explosion decoupling, so that the downstream disposal component is also separated from the system.
• FILTER PRESSURE MONITOR: It is used for permanent monitoring and indication of pressure conditions in the filter system, which may increase, for example, due to heavy contamination, saturation or wear of the filter material.
• ATEX PIPE CHECK VALVE: It is used for explosion decoupling of the ducting and prevents pressure rebound.
• ANTISTATIC FILTER MATERIAL: It prevents the formation of dangerous ignition sources, which can be caused by an electrostatic charge or discharge of the  separated dust particles. Particularly important, as the filter is generally subject to ATEX Zone 21.
• RESIDUAL DUST CONTENT MONITORING: It constantly monitors the dust concentration in the return air. If this deviates from the setpoint (e.g. in the event of filter breakage), the filter system is switched off to prevent unhealthy return air and the risk of explosion.