Process Safety Management

Flare-PSV Analysis

BakerRisk developed the PSVToolTM to efficiently conduct process safety pressure protection analysis and assist with the proper specification or revalidation of pressure relief devices for open systems (new and existing equipment).

Conventional Pressure Relief Valve

All equipment and piping systems should be protected when internal or external pressure can exceed the design condition of the system due to an emergency, upset condition, operational error, instrumentation malfunction, fire, or other credible scenario.

PSVToolTM was designed to efficiently specify and revalidate open system relief devices. Analyses include re-closing pressure relief devices (conventional, bellows, and pilot operated pressure relief valves) and non-reclosing devices (rupture disk and rupture pin).

The PSVToolTM utilizes methods and parameters defined in industry accepted guidelines and codes to perform required relief rate calculations.

Release scenario fluid properties are calculated through the DIPPR correlations. The calculation of required relief rates includes two-phase relief rate using the American Petroleum Institute (API) and Design Institutes for Emergency Relief Systems (DIERS) methods.

Pressure protection analysis inputs and results are documented in a PSV datasheet.

BakerRisk can also perform a full flare system analysis using PSVToolTM in conjunction with other software tools.  System backpressure can be determined on closed relief systems utilizing the ChemCad® process safety simulator to conduct dynamic flare header hydraulics and flare tip pressure drop calculations.  BakerRisk’s proprietary SafeSite3G® software can model the vapor dispersion of an atmospheric relief and the thermal radiation emitted from a flare stack or ground flare.