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 In 1998, this was superseded by the Advanced Reactive System Screening Tool (ARSST).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 data can be applied directly to the process scale .

Description and capabilities:
• easy setup for fast test turnaround
• lightweight glass test cell with good mixing
• open or closed cell tests and small sample size
• flow regime detector distinguishes between foamy and non-foamy behaviour
• scanning and isothermal modes.

The ARSST measures the temperature and pressure of the system:
• rate of pressure rise
• heat of reaction
• heat of mixing
• total adiabatic temperature rise
• onset temperature
• tempering temperature
• self-accelerating decomposition temperature
• time to maximum rate.

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