Combustible Dust Testing

Laboratory testing to quantify dust explosion & reactivity hazards

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Laboratory testing to quantify explosion hazards for vapor and gas mixtures

Chemical Reactivity Testing

Laboratory testing to quantify reactive chemical hazards, including the possibility of material incompatibility, instability, and runaway chemical reactions

DIERS Methodology

Design emergency pressure relief systems to mitigate the consequences of unwanted chemical reactivity and account for two-phase flow using the right tools and methods

Deflagrations (Dust/Vapor/Gas)

Properly size pressure relief vents to protect your processes from dust, vapor, and gas explosions

Effluent Handling

Pressure relief sizing is just the first step and it is critical to safety handle the effluent discharge from an overpressure event

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Classification of hazardous materials subject to shipping and storage regulations

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Develop critical safety data for inclusion in SDS documents

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Model transport of airborne virus aerosols to guide safe operations and ventilation upgrades

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Model transport of contamination for source term and leak path factor analysis

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Model transport of heat and smoke for fire analysis

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transport of flammable or toxic gas during a process upset

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Onsite safety studies can help identify explosibility and chemical reaction hazards so that appropriate testing, simulations, or calculations are identified to support safe scale up

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Safety analysis for packaging, transport, and storage of spent nuclear fuel

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Testing and analysis to ensure that critical equipment will operate under adverse environmental conditions

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Testing and analysis to ensure that critical equipment will operate under adverse environmental conditions

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Low thermal inertial adiabatic calorimeters specially designed to provide directly scalable data that are critical to safe process design

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Products and equipment for the process safety or process development laboratory

FERST

Software for emergency relief system design to ensure safe processing of reactive chemicals, including consideration of two-phase flow and runaway chemical reactions

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Facility modeling software mechanistically tracks transport of heat, gasses, vapors, and aerosols for safety analysis of multi-room facilities

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Recent Posts

Minimum Ignition Energy (MIE) – Combustible Dust Without Inductance?

Posted by The Fauske Team on 09.05.13

MIKE MIE Test ApparatusWhen testing for the Minimum Ignition Energy (MIE) of a dust, there are two approaches – with or without inductance. Testing “with inductance” simulates the longer duration discharges from electronic circuitry that can occur from machines or control equipment. Testing without inductance better simulates discharges from “pure” static electric sources. The spark duration is shorter and thus the determined energy levels are less conservative. If you are certain of the type of equipment used in your facility or are confident that you are only dealing with electrostatic sparks, then you can determine if the MIE should be conducted with or without inductance.

The minimum ignition energy test is performed using ASTM E2019 as the guideline. This test is important because it tells you the smallest amount of energy that can be present in your process and still ignite your dust. This data is particularly important when you have applications like conveying, sieving, and pouring. Also, in housekeeping situations, the MIE can help you safely design collection equipment. Additionally, knowledge about the MIE level is important for establishing proper grounding and bonding protocols and designing ignition source avoidance methodologies.  

If, after a review of your facility, you are only concerned about static-electric sparks, then the MIE test without inductance should be performed. If however, you are worried about sparks from electronic circuitry, other ignition sources or you wish to publish the MIE value on an Safety Data Sheet then the more conservative MIE method using inductance in the circuit is more appropriate (#3.2).

When testing your dust to find the minimum ignition energy (MIE), testing with inductance is a conservative approach that ensures you have the lowest value possible for your material. If there is any question about which form of the test should be used, you should consult a dust expert for guidance or use the conservative approach.

For more information on MIE or combustible dust testing, please contact Ashok Dastidar, PhD, MBA, Vice President, Dust & Flammability Testing and Consulting Services, Fauske & Associates, LLC at dastidar@fauske.com or 630-887-5249

 

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Topics: Combustible dust, MIE test, testing

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