Adiabatic Calorimeters

In the late 1970s, the American Institute of Chemical Engineers (AIChE) initiated a research project investigating various aspects of reactor vent sizing. This research project was to be known as DIERS (Design Institute for Emergency Relief Systems) and a newly-formed company called Fauske and Associates (FAI) were awarded the contract as lead investigators. This was due to Hans Fauske and his colleagues’ standing as world experts on two-phase flow which was thought to be a significant aspect when considering relief systems. The DIERS project formally finished in the mid-1980s but the worldwide DIERS community is still active and FAI are still active in the discussions and developments in vent sizing methodology.

Advanced Reactive System Screening Tool (ARSST)

In the mid-1980s, FAI introduced the RSST. In 1998, this was superseded by the Advanced Reactive System Screening Tool (ARSST). The ARSST was designed for hazards assessors who require basic information on process upset conditions. The ARSST is based upon a small (5-20ml) spherical glass test cell. This test cell is then heated by a wraparound heater which can bring the sample temperature to 400°C. Due to the unique polynomial heating method, the sample is kept in a quasi-adiabatic mode and no heat is lost to the surroundings. The test setup also results in a low phi factor and the…

Vent Sizing Package 2 (VSP2)

The Fauske VSP is a laboratory tool which allows a hazards assessor to collect precise ‘off-normal’ process design data. Using the VSP calorimeter, experiments can be performed to model upset scenarios such as loss of cooling, loss of stirring, mischarge of reagents, mass-loaded upset, batch contamination and fire exposure heating. As these experiments are performed prior to taking a chemical process from the small lab scale onto the pilot plant and manufacturing scales, the data needs to replicate the cooling properties of a large scale vessel. This is achieved by the calorimeter being centered around a 120ml thin walled metal…