By Technical Lead Benjamin C. Doup, PhD and Chief Technology Officer Ken Kurko
Fauske & Associates, LLC (FAI) has updated its emergency relief sizing tools with FERST software powered by CHEMCAD. FERST is the complete package combining the practical and easy-to-use interface and calculation methods from FAI’s PrEVentTM (Practical Emergency Vent Sizing) software, the direct use of temperature rise rates from low Φ-factor calorimetry data from FAI’s VSDS (Vent Sizing Dynamic Simulation) software and the material property, thermodynamic, and software development expertise from ChemstationsTM.
Interested in learning more?
Benefits Provided by FERST Powered by CHEMCAD:
GUI functionality improvements
- File handling
- Report of results
- Customizable plotting capability
- Flow sheet schematic for dynamic simulations
+ Allows the user to visualize connections between vessels and piping
Access to Chemstations technical support
- FAI will provide 2nd level support
Materials properties
- Maintain the ability to use user-specified material properties
- Each license comes with a license to the DIPPR database
- Access to pure component properties for 2557 components
- 40 different thermodynamic models
- Rigorous mixing models give bulk properties of mixtures
Design relief systems
- Leung-Omega and Fauske all-vapor/gas methods for:
+ Vapor (tempered) systems
+ Gassy (non-tempered) systems
+ Hybrid (tempered with gas generation) systems
+ Non-reactive fire exposure systems
- Built in sanity check using the Fauske screening method
+ Only need to input kinetic data correctly to perform an accurate check
- Leung-Omega method improvements
+ Omega definition options include:
- Leung’s most recent definition
- ISO 4126-10
- CHEMCAD flash calculation
+ A single set of equations for vapor, hybrid, and gassy system mass flux calculations
+ Ability to calculate flow for all-liquid subcooled flow
- Fauske all-vapor/gas method improvements
+ Ability to modify the isentropic coefficient for mass flux calculations
Rate relief systems using a static approach
- Input vent area and calculate the expected peak pressure
- Leung-Omega method for:
+ Vapor (tempered) systems
+ Gassy (non-tempered) systems
+ Hybrid (tempered with gas generation) systems
+ Non-reactive fire exposure systems
- Pipe pressure loss evaluations for:
+ Inlet and outlet piping of relief valve and a single relief line
Rate relief systems using a dynamic approach
- Build typical CHEMCAD flow sheet using vessels, pipes, and nodes
- Model change in material properties as function of venting time
- Source terms
+ Read in low Φ-factor adiabatic calorimetry
+ Zero-order kinetics
+ Non-reactive fire exposure
- Model multiple vessels venting simultaneously
- Pipe pressure loss evaluations for:
+ Inlet and outlet piping of relief valve, relief lines and headers
FERST Powered by CHEMCAD - A Staged Approach to ERS Design
