Emergency Relief System Tool Software by Fauske

Fauske & Associates (FAI) recently updated its emergency relief sizing tools to include the innovative CHEMCAD-powered FERST software.  This new software makes it easy to properly size an emergency relief system to safely vent unwanted pressure which can develop during upset conditions in chemical processing or storage.

FERST is a comprehensive and complete package. It features a robust combination of:

  • Industry-accepted DIERS-based calculation methods and a practical and user-friendly interface consistent with earlier PrEVent vent sizing software
  • Directly implements temperature rise rates from low Φ-factor adiabatic calorimetry data 
  • Material property, thermodynamic and software development expertise via Chemstations™ 

FERST, powered by CHEMCAD, offers a diverse array of benefits, including:

  • GUI functionality includes easy file handling, advanced result reporting, customizable plotting capability and a flow sheet schematic ideal for dynamic simulations
  • Visualize connections between vessels and piping
  • Access to technical support from Chemstations and FAI (Fauske)

FERST is great for determining material properties, with supported features including:

  • User-specified material properties if desired
  • Each license includes access to the DIPPR database
  • Pure component properties are available for 2,557 components
  • Access to 40 different thermodynamic models
  • Rigorous mixing models provide detailed insight into mixture bulk properties

Image Credit: Fauske & Associates

The design of emergency relief systems is made straightforward and accessible, thanks to a range of available methods, including:

  • Leung-Omega and Fauske all-vapor/gas methods suitable for gassy (non-tempered) systems, vapor (tempered) systems, hybrid (tempered with gas generation) systems and non-reactive fire exposure systems
  • A built-in Fauske screening method designed to provide additional verification – this simply requires the most basic kinetic (rate) data to perform an accurate check
  • Improved Leung-Omega methods, including Leung’s latest definition, ISO 4126-10 and a CHEMCAD flash calculation
  • A single set of equations for mass flux calculations in vapor, hybrid and gassy systems
  • Easy flow calculations for all-liquid subcooled flow
  • Improved Fauske all-vapor/gas methods, including the ability to modify the isentropic coefficient for mass flux calculations

Image Credit: Fauske & Associates

The system is amenable to either a static or dynamic approach to relief system design.

Those who prefer a static approach can benefit from features such as:

  • The ability to calculate the expected peak pressure relative to the available vent area, so as to "rate" the performance of a relief system to accommodate a given upset scenario
  • Access to the Leung-Omega method, suitable for vapor (tempered) systems, gassy (non-tempered) systems, hybrid (tempered with gas generation) systems and non-reactive fire exposure systems
  • Access to pipe pressure-loss evaluations suitable for inlet and outlet piping of both relief valve and a single relief line

Image Credit: Fauske & Associates

Those who prefer a dynamic approach can leverage a range of powerful options, including:

  • The ability to build a common CHEMCAD flowsheet using vessels, pipes and nodes
  • The ability to model changes in material properties as a function of venting time
  • The ability to directy import test data from a low Φ-factor adiabatic calorimetry (e.g., ARSST or VSP2), or to simply input zero-order kinetics or non-reactive fire exposure parameters
  • The option to simultaneously model the venting of multiple vessels
  • Access to pipe pressure-loss evaluations for both the inlet and outlet piping of relief valves, relief lines and headers

FERST Powered by CHEMCAD - A Staged Approach to ERS Design

Image Credit: Fauske & Associates

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