Numerous processes can create explosive dust/air mixtures inside industrial systems (i.e., dust collectors, mixing machines, fluid bed granulators, mills, etc.). If ignition sources cannot be excluded due to process conditions, these systems are often equipped with constructive explosion protection measures such as pressure relief or pressure suppression. In this instance, connected ductwork is decoupled from containers to be protected so that no flames or explosion pressure can be transferred into other areas.
Reliable protection against explosion pressure and explosion flames
Keller Lufttechnik developed the back pressure flap series ProFlapIII for effective explosion decoupling for most sectors of industry. The ProFlapIII is certified as a protective system according to EU Guideline 2014/34/EU (ATEX 114) and is approved for decoupling of dust explosions of organic and mineral dusts.
Brochure Back pressure flap ProFlapDownload Brochure
Avoiding an explosive environment seems to be the most obvious protective measure to successfully prevent a dust explosion - but not all processes are suitable for it.
Aluminum processing with MQL, for example, is interrupted during the cleaning of filter elements. During cleaning, no ignition source can gain entry.
Furthermore, the suction air duct is monitored by a spark sensor. If an ignition spark entry is detected, the PLC can be set to prevent the next pending cleaning of the filter elements, thereby averting an explosive situation.
The ProSens-System is suitable for organic and metal dusts.
ProPipePlus ensures safe explosion pressure relief inside closed rooms by means of the patented flame barrier and dust separation. The special stainless steel construction is approved for metal dust, and since the end of 2013 an aluminum version is available, as well.
Indoor installation - no safety distance required
The patented ProPipePlus system does not require a protection zone. For aluminum dust, a special version is available.
The air flow of any individual system can be monitored by ProFlow. If the desired nominal air flow is not achieved, an alarm is displayed on the machine's control, after a brief time delay. The creation of an explosive environment is averted, in addition to any caked-on deposits inside the ductwork, which can pose a fire hazard. Additionally, operators are protected from contaminated air when opening the hatches.