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When stored at home in small amounts or even in big bags at warehouses, milk powder is considered a harmless product — as long as fine dust particles are not airborne, dispersed and in contact with a source of ignition such as a mechanically created spark, a spark created by discharging static electricity, a hot surface, or an open fire.
Appropriate Protection for the Spray Dryer Process The NFPA approach Per NFPA 68, the conventional approach to protecting a spray dryer would be to apply so called explosion relief devices that offer a certain venting area taking into account the entire chamber volume, the strength of the vessel and the so called K St -value pressure rise normalized to a 1 m 3 — chamberalthough the process conditions inside a spray dryer are quite different from the vessels that the NFPA 68 committee had in mind when publishing the standard.
Per NFPA 68, the conventional approach to protecting a spray dryer would be to apply so called explosion relief devices that offer a certain venting area taking into account the entire chamber volume, the strength of the vessel and the so called K St -value pressure rise normalized to a 1 m 3 — chamberalthough the process conditions inside a spray dryer are quite different from the vessels that the NFPA 68 committee had in mind when publishing the standard.
The powdery commodity is dried through hot current or counter-current gas. Unfortunately, these conditions are present in other elements of typical spray drying installations cyclones, bag filters, fluid bed driers, screens as well — so wherever the explosion starts it could propagate to all interconnected vessels.
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VDI Blatt 1 Genetic engineering operations in genetic engineering facilities – Guidance on safe operation of genetic engineering facilities Realistically evaluating risks is another approach that may result in less equipment or less costly equipment being used. After an event, simply clean and replace the bursting disc and the flameless vent is immediately ready for operation once again. D, Dust Explosion Hazard Assessment, presentation: One process that has received limited attention with respect to protection against combustible dust risks to date is the spray drying process.
All of these features add up to additional savings. VDI Blatt 4 Competent Persons – Requirements for external training for the testing of handheld electric operated tools VDI Dust fires and dust explosions – Hazards – assessment – safety measures Any airborne organic dust that can burn could lead to an explosive atmosphere.
Occupational safety Abstract order now from Beuth Verlag. The NFPA approach for protection of spray dryers, from the prospective of explosion safety experts, is much too conservative and leads to an over-engineered result 8. VDI Emergency cdi of people For more information on Combustible dust, see, Mayer, Gerd, Ph. VDI Blatt 9 Dust fires and dust explosions – Hazards – assessment – protective measures – Determination of dustiness of bulk materials Furthermore, the volume taken into account would only be the cone volume— the alignment of the maximum explosions pressure to the process conditions is the final step of this engineered approach.
These same readers should know that NFPA always gives a performance-based design option as an alternative, which simply means that other approaches are also allowed.
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The K St value is significantly influenced by the dust concentration 9. VDI Blatt 1 Workplace air – Reduction of exposure to air pollutants – Legal principles, terms and definitions, basic organisational measures for industrial safety and environmental vdo For more information see http: Since most spray dryer installations are indoors, indoor flameless venting would then be the solution to consider.
Detailed information on cookies and your right of objection can be found in our data privacy statement. This transfer fully extinguishes the flames. VDI Blatt 5 Dust fires and dust explosions – Hazards, assessment, protective measures – Explosion protection in fluidized bed dryers Much has been written and will continue to be written about the 22663 of combustible dust in a manufacturing facility, if for no other reason, than because people are injured and die every year from combustible dust-related explosions 1.
VDI Blatt 1 Pressure venting of dust explosions The risk of combustible dust explosions is often underestimated: The costs for startup, fines, compensation to the injured, etc.
VDI Blatt 6 Dust fires and dust explosions – Hazards – assessment – protective measures – Dust fires and explosion protection in dust extracting installations VDI Blatt 2 Dust fires and dust explosions; hazards, assessment, protective measures; inerting Since the concentrations in spray dryers are much lower maximum: For this reason, it is necessary to equip the spray drying process with appropriate protective measures.
For example, we use powdered milk in food we eat and handle such powder in our kitchens, living rooms, coffee shops and even airplanes.
The following example of a m 3 spray drier where the required venting area following NFPA 68 would be 6. Incidence numbers vary and the near misses are not accounted for. Additionally, the pressure rise and increased noise level associated with free vented explosions are massively reduced to negligible, harmless levels.
With indoor venting systems, installation is uncomplicated and cost-intensive venting ducts are eliminated. VDI Blatt 4 Dust fires and dust explosions; hazards, assessment, protective measures; suppression of dust explosions The risks are great as are the potential costs for protection following conventional design standards. Whatever the approach, spray dryer processes must be evaluated for their combustible dust risk and protected accordingly.
These interpretations will be discussed as an alternative cost-effective method of protecting spray dryer processes as they specify the partial volume approach for the sizing of explosion relief devices described in NFPA 68 and FM Global Loss Prevention Data Sheet VDI Blatt 7.