Combustible Dust Testing

Laboratory testing to quantify dust explosion and reactivity hazards

Safety Data Sheets

Develop critical safety data for inclusion in SDS documents

Gas and Vapor

Laboratory testing to quantify explosion hazards for vapor and gas mixtures

Classification of hazardous materials subject to shipping and storage regulations
Testing and consulting on the explosion risks associated with devices and processes which use or produce hydrogen
Safety Data Sheets

Develop critical safety data for inclusion in SDS documents

Thermal Stability

Safe storage or processing requires an understanding of the possible hazards associated with sensitivity to variations in temperature

Adiabatic Calorimetry
Data demonstrate the consequences of process upsets, such as failed equipment or improper procedures, and guide mitigation strategies including Emergency Relief System (ERS) design
Reaction Calorimetry
Data yield heat and gas removal requirements to control the desired process chemistry
Battery Safety

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

Safety Data Sheets

Develop critical safety data for inclusion in SDS documents

Cable Testing
Evaluate electrical cables to demonstrate reliability and identify defects or degradation
Equipment Qualification (EQ)
Testing and analysis to ensure that critical equipment will operate under adverse environmental conditions
Water Hammer
Analysis and testing to identify and prevent unwanted hydraulic pressure transients in process piping
Acoustic Vibration
Identify and eliminate potential sources of unwanted vibration in piping and structural systems
Gas & Air Intrusion
Analysis and testing to identify and prevent intrusion of gas or air in piping systems
ISO/IEC 17025:2017

Fauske & Associates fulfills the requirements of ISO/IEC 17025:2017 in the field of Testing

ISO 9001:2015
Fauske & Associates fulfills the requirements of ISO 9001:2015
Dust Hazards Analysis
Evaluate your process to identify combustible dust hazards and perform dust explosion testing
On-Site Risk Management
On-site safety studies can help identify explosibility and chemical reaction hazards so that appropriate testing, simulations, or calculations are identified to support safe scale up
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 safely handle the effluent discharge from an overpressure event

FATE™ & Facility Modeling

FATE (Facility Flow, Aerosol, Thermal, and Explosion) is a flexible, fast-running code developed and maintained by Fauske and Associates under an ASME NQA-1 compliant QA program.

Mechanical, Piping, and Electrical
Engineering and testing to support safe plant operations and develop solutions to problems in heat transfer, fluid, flow, and electric power systems
Hydrogen Safety
Testing and consulting on the explosion risks associated with devices and processes which use or produce hydrogen
Thermal Hydraulics
Testing and analysis to ensure that critical equipment will operate under adverse environmental conditions
Nuclear Safety
Our Nuclear Services Group is recognized for comprehensive evaluations to help commercial nuclear power plants operate efficiently and stay compliant
Radioactive Waste
Safety analysis to underpin decomissioning process at facilities which have produced or used radioactive nuclear materials
Adiabatic Safety Calorimeters (ARSST and VSP2)

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

Other Lab Equipment and Parts for the DSC/ARC/ARSST/VSP2 Calorimeters

Products and equipment for the process safety or process development laboratory


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


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


Our highly experienced team keeps you up-to-date on the latest process safety developments.

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Stay informed with our quarterly Process Safety Newsletters sharing topical articles and practical advice.


With over 40 years of industry expertise, we have a wealth of process safety knowledge to share.

Recent Posts

MIE Testing for Combustible Dust Safety: With or Without Inductance?

Posted by Fauske & Associates on 10.30.20

By the Combustible Dust Safety Team, Fauske & Associates, LLC


We know we have discussed the Minimum Ignition Energy (MIE) test before, but given a recent uptick in questions on the subject, we thought it was a good time to “dust” off the topic and take another look.

MIE graphicThe MIE test determines the lowest amount of spark energy that is required to initiate an explosion of a dust in a suspended cloud. It is performed using ASTM E2019, “Standard Test Method for Minimum Ignition Energy of a Dust Cloud in Air” or EN13821 “Potentially explosive atmospheres — Explosion prevention and protection — Determination of minimum ignition energy of dust/air mixtures”.  These methods provide procedures for performing laboratory tests to determine the minimum ignition energy of a dust cloud.

In both standards, the MIE tests can be performed with or without “inductance” - which defines as: “A property of an electric circuit by which an electromotive force is induced in it by a variation of current either in the circuit itself or in a neighboring circuit”. So, what does that really mean?  Simply put, testing “WITH inductance” simulates the longer duration discharges from electronic circuitry that can occur from machines or control equipment (essentially a spark from short in a wire or electronic equipment) or mechanical sparks.  Testing with inductance is a more conservative approach that ensures you have the lowest MIE value possible for your material.

Testing WITHOUT inductance better simulates discharges from “pure” and “ideal” static electric sources (the build-up of a charge on a surface resulting from contact with other surfaces – e.g. pouring or rubbing). The spark duration is shorter when dealing with “pure” static electric sources, so the determined energy levels are typically less conservative.

This data is critical when considering what could happen if a dust cloud is exposed to a spark.  A build up of static electricity is a fairly common occurrence in many industrial processes.  Simple movements or activities such as conveying, sieving or pouring/transferring material from container to container can be enough to cause a spark, and, that could be all it takes – one spark from a short in a wire or a discharge from a “pure” static electric source, plus the right air to dust (read fuel) mixture,  to cause ignition. 

Knowledge of the MIE of a dust is also helpful in housekeeping situation as it can help facilities identify proper tools for safe clean up, as well as assist in the safer design of dust collection equipment. Additionally, knowledge about the MIE level is important for establishing proper grounding and bonding protocols and designing ignition source avoidance methodologies.


Of course, the data provided by MIE testing can be even more useful when combined with a dust hazard analysis or DHA which is a systematic evaluation of the hazards involved in the dust handling or generating process. Either way it is critical to take a look at your own facility and process to determine the best iteration of the test for your specific scenario needs.

After a review of your facility, if you are certain of the type of equipment being used in your process, 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. If, you are only concerned about static-electric sparks, then likely 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 a Safety Data Sheet, then the more conservative MIE method using inductance in the circuit is more appropriate.

This is intended to inform about the differences between MIE testing with and without inductance. 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, please contact us at


Topics: Combustible Dust, Process Safety, Process Hazards Analysis, Testing


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