"A relief system is an emergency system for discharging gas during abnormal conditions, by manual or controlled means or by an automatic pressure relief
Fauske & Associates, LLC (FAI) was the principal research contractor for the Design Institute for Emergency Relief Systems (DIERS), an extensive R&D program sponsored by 29 companies under the auspices of AIChE and completed in 1985. Company founder, Dr. Hans K. Fauske served as the principal investigator and overall leader of the DIERS research project. A primary purpose of that effort was evaluation of emergency relief vent requirements, including energy and gas release rates for systems under upset conditions and the effect of two phase flow on the emergency discharge process.
The DIERS program resulted in the development of a bench scale low thermal inertia adiabatic calorimeter, which was first commercialized as the Vent Sizing Package (VSP). Later improvements led to the VSP2. The Reactive System Screening Tool (RSST TM) was introduced by FAI in 1989 to provide an easy, inexpensive approach to the DIERS testing method. Enhancements led to the Advanced RSST (ARSST) in 1999. FAI uses the DIERS-based VSP2 and ARSST calorimeters to characterize chemical systems and design emergency pressure relief systems. Both instruments provide vent sizing data that are directly applicable to the process scale.
Adiabatic calorimeter testing provides data for relief system design, safe scale-up of chemical processes, and changes to process recipes. Safe process design requires knowledge of chemical reaction rates, character and energy release - all of which can be obtained from a low phi-factor adiabatic calorimeter such as the VSP2 (Vent Sizing Package 2) or ARSST (Advanced Reactive System Screening Tool).
Where Can I Learn More about Relief System Design and Vent Sizing?
Courses, handbooks and papers are available with a quick internet search. FAI provides courses, for example, either in our state-of-the-art lab setting or your location of choosing. The next available course is:
Relief System Design Course
May 15-16, 8 am to 4 pm, FAI Headquarters, 16w070 83rd Street, Burr Ridge (Chicago area), IL, CEUs: 1.6 (16 PDH)
Unlike other emergency vent sizing courses, this curriculum highlights simplified calculation methods capable of giving safe - but not overly conservative - relief system designs, with an emphasis on reactive chemistries and the role of two-phase flow.
Benchmarking of these methods will be illustrated with incidents and available plant data. Utilization of methods and equations will be demonstrated through practical design examples, covering vapor, gassy and hybrid systems.
Course Topics - Day 1
Course Topics - Day 2