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.

Process Safety Newsletter

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

Introducing the 20-L Combustion Vessel

Posted by Fauske & Associates on 11.09.23

20L Vessel ApparatusOne of the largest causes for loss in process industries for both equipment and life is fire. The sheer volume and frequency of use of flammable and combustible liquids and gases handled worldwide implies that the risk of industrial accidents is great. Safe processing requires understanding and quantifying these risks by obtaining the necessary safety data, which include things like flash point, flammability limits, and minimum ignition energy, for example.

As industrial process designs have evolved to take advantage of efficiencies at higher pressures and temperatures, the data requirements have evolved as well. To support data collection under more challenging test conditions Fauske & Associates (FAI) is excited to offer our “latest and greatest” addition to the flammability testing lab – the 20-L combustion vessel (Figure 1). This specially built spherical vessel is designed to safely handle standard and custom gas/vapor flammability tests with starting temperatures from ambient up to 350°C and pressures from ambient up to 100 bar (1450 psi). Furthermore, the vessel is constructed of 321 stainless steel to ensure resistance to corrosive materials. The vessel is also fitted with a self-cooled gas stirrer to establish constant mixing when adding various components to achieve uniformity of the gases and/or vapors inside the chamber prior to ignition. Currently, the vessel is equipped to perform flammability limits (LFL & UFL) testing per ASTM E918, limiting oxygen concentration (LOC) testing per ASTM E2079, and explosion severity (Pmax & KG) testing per EN 15967. A few advantages and disadvantages that the spherical 20-L vessel has over our standard spherical 5-L vessel can be seen below.


  • Excellent for testing materials that require large quenching distance to ignite, such as halogenated compounds
  • The testing vessel can be uniformly heated up to 350°C, as opposed to 300°C
  • Reduction in the data impact of “ringing” effects from ignitions of energetic materials that have very high pressure rise rates (dP/dt)
  • Ignition source can be an electrical spark igniter or fuse-wire igniter, as opposed to only a fuse-wire ignition source


  • Longer duration of testing campaigns due to slower vacuum/purge cycles in between trials at the larger volume
  • Larger sample amounts required for testing given the larger volume


Verification tests were performed in the 20-L chamber across the flammable region of propane in air using methods referenced in ASTM E918 and EN 15967 to ensure the functionality of the apparatus. These results are presented graphically in Figure 2. The flammability limits and explosion test results are compared with reported literature values in Tables 1 and 2, respectively.

Screenshot 2023-11-01 at 9.33.15 AM


Screenshot 2023-11-01 at 9.33.28 AM

As seen in the tables, the deflagration results obtained for the propane-air mixtures are in good agreement with previously reported values in literature while the Pmax and deflagration index (KG) obtained are slightly higher (more conservative) than the literature data. It is noted that the maximum overpressure and the deflagration index are affected by numerous experimental conditions which include temperature, moisture content and purity of the gases, and the ignition source used. Additionally, the deflagration index increases with vessel volume (EN 15967, 2011). Thus, it is likely the slight variation between the FAI results and the reported literature values (which also show variability between sources) is attributable to the experimental procedure, conditions used during the test, and the larger vessel volume used by FAI. All things considered we are very pleased with the performance of our new instrument. We look forward to using our expanded flammability testing capabilities in support of your process safety needs. For more information, please contact us at

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Engineering ToolBox, (2003). Gases - Explosion and Flammability Concentration Limits. [online] Available at:

EN 15967:2011-10, Determination of Maximum Explosion Pressure and the Maximum Rate of Pressure Rise of Gases and Vapours; Deutsche Fassung EN_15967:2011.

Mashuga, C. V. (1999). Determination of the Combustion Behavior for Pure Components and Mixtures using a 20-Liter Sphere. Michigan Technological University. Ann Arbor: UMI Company.

NFPA 68. (2007). Standard on Explosion Protection by Deflagration Venting: National Fire Protection Association.

Senecal, Joseph A., and Patricia A. Beaulieu. “KG: New Data and Analysis.” Process Safety Progress, vol. 17, no. 1, 1998, pp. 9–15.

Topics: Flammability


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