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

What is Adiabatic Calorimetry?

Posted by Fauske & Associates on 01.26.22

By Aaron Ruiz & Elizabeth Raines

Adiabatic calorimetry is a powerful tool that can be used to support plant safety. A calorimeter is a device that is used to measure the amount of heat associated with chemical or physical processes. An adiabatic calorimeter is designed to ensure that there is no heat transferred between the system and its surroundings. Therefore, an adiabatic calorimeter is designed so that the exothermic heat produced by a reaction directly goes to increasing the temperature. As the temperature increases, the rate of reactions often exponentially increases. On a large plant scale, the available cooling capacity is fixed, so as the rate of reaction exponentially increases, the heat generated from an exothermic reaction can surpass available cooling. This can lead to a runaway reaction. Some common scenarios that may lead to a runaway reaction include fire exposure, loss of cooling, overcharging or a reagent or catalyst, an all-in addition of a reagent, etc. Adiabatic calorimetry can be used to simulate these scenarios to characterize the potential for a runaway reaction and to collect the data necessary for emergency relief system (ERS) design using software such as FERST powered by CHEMCAD. Adiabatic calorimeters measure temperature and pressure increases associated with exothermic reactions, from which the adiabatic rates of temperature and pressure rise are developed.


The VSP2 is a robust and customizable low thermal inertia adiabatic calorimeter capable of simulating a variety of abnormal process conditions.

  • vsp2Test Cell Size: 116 mL
  • Containment Vessel Size: 4 L
  • Typical Sample Size: 80 mL
  • Typical Phi-Factor: Low; Approximately 1.09
  • Typical Sensitivity: 0.05 to 0.1°C/min
  • Typical Test Design (Open or Closed): Both available
  • Thermocouple Measurement: Direct
  • Stirring Capabilities: Strong with use of Super Stirrer
  • Typical Modes of Operation: Heat-Wait-Search, Adiabatic Loss of Cooling, Imposed Background Heating
  • Typical Setup Time: 1-4 Hours
  • Material of Construction for Wetted Parts: Hastelloy C, Stainless Steel, or Glass
  • Best Suited For: Simulating abnormal process conditions to collect directly scalable data suitable for vent sizing


The ARSST is an excellent screening tool with a small sample size that is easy and quick to operate and allows for a portable setup.

  • ARSST-benchtop-stirrerTest Cell Size: 5-20 mL
  • Containment Vessel Size: 350 or 450 mL
  • Typical Sample Size: 4-16 mL
  • Typical Phi-Factor: Low; around 1.05
  • Typical Sensitivity: 0.1°C/min
  • Typical Test Design (open or closed): Open
  • Thermocouple Measurement: Direct
  • Stirring Capabilities: Good
  • Typical Modes of Operation: Imposed Background Heating.
  • Typical Setup Time: 1/2-1 Hour
  • Material of Construction for Wetted Parts: Glass Test Cell, Variety of Thermocouple Material of Construction
  • Best Suited For: Gas-generating systems, companies with limited sample quantities, and for quickly screening for adverse reactions


The ARC is a sensitive instrument that is easy to operate.

  • ARCTest Cell Size: 10 mL
  • Containment Vessel Size: N/A
  • Typical Sample Size: 0.5-10 grams
  • Typical Phi-Factor: 1.5 and up
  • Typical Sensitivity: 0.02°C/min
  • Typical Test Orientation (open or closed): Closed
  • Thermocouple Measurement: Indirect
  • Stirring Capabilities: Poor or N/A
  • Typical Modes of Operation: Heat-Wait-Search or Isothermal
  • Typical Setup Time: 1/2-1 Hour
  • Material of Construction for Wetted Parts: Hastelloy C, Stainless Steel, Titanium, or Tantalum
  • Best Suited For: Identifying potential thermal hazards and early conversion kinetics.

Low-Thermal Inertia Calorimetry: Phi-Factor

The Phi-factor is a dimensionless parameter that is based on the ratio of the total heat capacity of the filled test cell (or vessel) and the total heat capacity of the sample (or vessel contents) alone. This ratio is an indication of how much heat is required to heat up the combined mass of the test cell (or vessel) and its contents relative to just heating the sample (or vessel contents). If the material is exothermically reacting, a heavy test cell will absorb some of this heat and therefore the full adiabatic potential will not be reached by the sample. In other words, in the field of adiabatic calorimetry we are not just cognizant of heat loss to the environment but also heat loss to the container (i.e. test cell). This parameter serves as a correction factor that can be used to adjust collected adiabatic data. For large vessels, light vessels, or at true adiabatic conditions, the Phi – factor approaches 1. Therefore, a Phi – factor of 1.1 indicates that the temperature rise data collected in an adiabatic instrument may need to be adjusted by approximately 10% (for example, to estimate the adiabatic temperature rise). Note that the effect on kinetics (for example, reaction rates) is nonlinear. As you increase the Phi – factor, the required correction to the data increases. With too large of a Phi – factor, a concern is that you may be missing additional thermal potential (e.g. secondary decomposition reactions which can occur at higher temperatures). Having a low Phi – factor adiabatic calorimetry like the ARSST and VSP2 is ideal for directly scaling the collected data to full scale vessels.

For more information, or guidance into what test method is right for you, contact Elizabeth Raines at

Topics: VSP2 & ARSST Calorimeters


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