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Laboratory testing to quantify dust explosion & reactivity hazards

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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

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

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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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Testing to support safe design of batteries and electrical power backup facilities particularly to satisfy UL9540a ed.4

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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

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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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Recent Posts

Collecting, Prep and Screening For Combustible Dust Testing

Posted by The Fauske Team on 01.21.19

We notice that many of you are asking about how to collect potentially hazardous or combustible dust, how a sample prep and screening test goes, along with various tests demonstrated. So, here's a list of videos to help:

How to Collect Your Dust How to Collect Potentially Combustible Dust

Sample Prep and Screening Test Video

20L Test Video

MIE, MIT & LIT Testing

Here's also How to Collect Your Dust as a helpful PDF.  

The first step of the combustible dust testing process is typically the Explosibility & Combustible Dust Screening Tests.  If the material is found to be explosible in a dust cloud the next step would be a KSt or “Explosion Severity Test” (to determine KSt and Pmax values).  You may also want to consider the Minimum Ignition Energy (MIE) or the Minimum Explosible Concentration (MEC) testing.  In addition, an independent, skilled lab can assist with any on-site process safety needs to make you compliant with NFPA 652’s requirement for a Dust Hazards Analysis (DHA).  

Here's a list of tests or steps you may need for potentially combustible dust :

  • Particle Size Reduction: Sieving or Milling to less than 200 mesh per ASTM recommendations 
  • Drying the Sample for Testing: Vacuum drying to less than 5% moisture per ASTM recommendations 
  • “Explosibility Screening Test” based on VDI 2263 Part 1 and ASTM E1226 Section 13 methods. Prelude to full explosion testing – explosion severity and ignition sensitivity. 
  • “Combustibility Screening Test” based on VDI2263 Part 1 and UN 4.1: Screening test for combustible dusts. 
  • “Screening Package” Test: Combines “Explosibility Screening Test” and “Combustibility Screening Test”
  • “Hard-to-Ignite” Test using a 500-J ignition source. 
  • (ASTM E2019) Minimum Ignition Energy, MIE – Electrostatic Hazards: Identifies minimum spark energy required to ignite a dust cloud without inductance. 
  • (ASTM E2019) Minimum Ignition Energy, MIE – Conservative Approach: Identifies minimum spark energy required to ignite a dust cloud with inductance.
  • (ASTM E1515) Minimum Explosible Concentration, MEC: Identifies the minimum concentration of dispersed dust required to propagate an explosion. (Like an LFL for gases). 
  • (ASTM E1226) Dust Explosion Severity: Examines the potential violence of a dust explosion of the sample. (Generates Pmax, (dP/dt)max and KSt data). 
  • (ASTM E1491) Minimum Ignition Temperature - Cloud, MIT: Identifies the minimum temperature at which the materials will autoignite when dispersed in air as a cloud. 
  • (ASTM E2021) Hot-Surface Ignition Temperature of Dust Layer, LIT: Identifies the minimum temperature at which a dust layer will ignite. 
  • (ASTM D-257) Volume Resistivity: Measures the conductivity of a dust sample. Charge Relaxation Time: Identifies the electrostatic charge decay time of a dust sample. 
  • Powder Chargeability 
  • (ASTM E2931) Limiting Oxygen Concentration (LOC): Identifies the minimum concentration of oxygen needed to propagate an explosion through the sample dust. (Helps to establish the inerting level). 
  • Drop Weight Impact (based on UN Transport of Dangerous Goods manual): Identifies the impact energy required to ignite a dust layer. 
  • Friction Sensitivity (based on UN Transport of Dangerous Goods manual): Identifies the frictional force required to ignite a dust layer. 
  • OSHA Combustible Dust NEP Package: The package includes material analysis for combustible content, Pmax, KSt, MEC, MIE, TGA, and MIT dust cloud. 
  • UN4.1 Burn Rate: This test series will be conducted according to UN Manual of Tests and Criteria, Test N.1, “Test Method for Readily Combustible Solids”. The test will determine the ability of a substance to propagate combustion when ignited and its burning time (rate) .

A state of the art, independent combustible testing lab can help provide direction on all these things. If you'd like to learn more regarding dust sample collection, preparation, and testing check out our information sheet. It provides common examples of combustible dust and answers our most frequently asked questions.


Common Questions Regarding Dust Sample  Collection, Preparation, and Testing

For more information, contact dust@fauske.com, 630-323-8750. 

 

Topics: Combustible dust, testing

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