The guideline VDI Part 9 describes a procedure for the determination of the dustiness of combustible dusts by practical simulation of dust formation. 12 Jun New basic interpretations, however, in accordance with the VDI Data Sheet 7 guideline, “Dust Fires and Dust Explosions for spray dryers. VDI [New]. Title (german) Staubbrände und Staubexplosionen – Gefahren – Beurteilung – Schutzmaßnahmen. Product imageVDI Items with .
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Thus this method should be discussed in detail with Authorities Having Jurisdiction AHJ in the interest of improved compliance leading to increased safety in addressing the combustible dust vdi 2263. Only in this way vdi 2263 the level of protection, and thus occupational safety, be ensured.
These interpretations will be discussed as an alternative cost-effective method of protecting spray vdi 2263 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 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.
These same readers should know that NFPA always 22263 a performance-based design option as an alternative, which vxi means that other approaches are also allowed. For example, we use powdered milk in food we eat and handle such powder in our kitchens, living rooms, coffee shops and even airplanes.
Combustible Dust 6 Any airborne organic dust that can burn could lead to an explosive atmosphere. For more information see http: Therefore, plant process hazard analyses and dust testing vdo be an integral part of the total safety concept vdi 2263 NFPA standards, OSHA requirements, and as a practical matter 3!
D, Dust Explosion Hazard Assessment, presentation: The costs for startup, fines, compensation to the injured, etc. The following example of a m 3 spray drier where the required venting area following NFPA 68 would be 6. After an event, simply clean and replace the bursting disc and the flameless vent is vdi 2263 ready for operation once again. The K St value is vdi 2263 influenced by the dust vdi 2263 9.
vdi 2263 This transfer fully extinguishes the flames. With indoor venting systems, installation is uncomplicated and cost-intensive venting ducts are eliminated. For more information on Combustible dust, see, Mayer, Gerd, Ph.
One process that has received limited attention with respect to protection against combustible dust risks to date is the spray drying process. A modern explosion protection system must be safe and economically reasonable. Whatever the approach, spray dryer processes must be evaluated for their combustible dust risk vci protected accordingly.
Procedure-optimized installation within the immediate vicinity of people and machines is also an advantage, as vdi 2263 visual inspection without high-priced maintenance costs. vdi 2263
The powdery commodity is dried through hot current or counter-current gas. Realistically evaluating risks is another approach that may result in less equipment or less costly equipment being used.
When stored vdi 2263 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 vdi 2263 open fire. 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 vdi 2263 account the 263 chamber volume, the strength of the vessel and vdi 2263 so called K St -value pressure 2236 vdi 2263 to cdi 1 m 3 — chamberalthough the process conditions inside a spray dryer are quite vdi 2263 from the vessels that the NFPA 68 committee had in mind when publishing the standard.
Spray-dryers are primarily deployed in the chemical and food industry, for processes such as powdered milk, detergent powder or infant formula production.
The Vdu 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.
For this reason, it is necessary to equip the spray drying process with appropriate protective measures. Vdi 2263, this innovative calculation method allows for effective explosion protection with 2236 at an affordable, competitive price.
The risks are great as are the potential costs for protection following conventional design vdi 2263. Any airborne organic dust that can burn could lead to vdi 2263 explosive atmosphere. Since most spray dryer installations are indoors, indoor flameless venting would then be the solution to consider.
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The liquids slurries are atomized in a drying tower by means of pressure nozzles or rotating discs. Vdi 2263 risk of combustible dust explosions is often underestimated: All of these features add up to additional savings. Since the concentrations in spray dryers are much lower maximum: Additionally, the pressure rise and increased noise level associated with free vented explosions are massively reduced to negligible, harmless levels.
The specially developed filter ensures that no burnt or unburnt dust particles are discharged. Furthermore, the volume taken into account would only be the cone volume— the alignment of the maximum explosions pressure to the process conditions vdi 2263 the final step of this engineered approach. Appropriate Protection for the Spray Dryer Process The NFPA approach Per NFPA 68, the conventional approach to protecting vdi 2263 spray dryer would be to apply so called explosion relief devices that offer a certain venting area taking into account the entire chamber vdi 2263, the vdi 2263 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 vdi 2263 the vessels that the NFPA 68 vdi 2263 had in mind when publishing the standard.
Much has been written and will continue to be written about the risks 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. If there is a combination of such dusts with a sufficient ignition source, explosions can occur.
Incidence numbers vary and the near misses are not accounted for.