DIERS-compliant laboratory data for two-phase vent sizing
DIERS methodology requires specific calorimetric data to size emergency vents for runaway reactions. We deliver VSP (Vent Sizing Package), Phi-Tec, and ARSST data with engineering interpretation ready for vent design calculations.
A structured, facilitated process — from scope definition through close-out — producing defensible, actionable outputs.
Define vent-sizing scenarios per DIERS — runaway reaction, fire-case external heat, blocked outlet, control-failure overfill; align with AIChE DIERS Workbook and IChemE Workbook for the Estimation of Reactor Stability.
Conduct vent-sizing calorimetry — VSP2 (Vent Sizing Package 2) or Phi-TEC II with adiabatic operation; measure dT/dt, dP/dt, gas evolution rate, and two-phase flow regime; align with DIERS test methodology.
Characterise two-phase flow regime per DIERS Omega method — homogeneous, bubbly, churn-turbulent; measure / calculate void fraction, droplet entrainment, and quality; align with API 520 / AIChE DIERS / OMEGA.
Calculate vent area per DIERS — Leung simplified method (homogeneous vapour-liquid disengagement), Fauske rigorous method, Omega method, or HEM (Homogeneous Equilibrium Model); align with API 520 / API 521.
Size vent piping per API 520 / API 521 with two-phase flow Fanno / isothermal correlations; size knock-out drum / catch tank with API 521 Section 7; specify drainage to safe location per RAGAGEP.
Compile vent sizing report with raw calorimetric data, design calculations, P&ID mark-up; integrate with HAZOP / SIL allocation and SRS; align with OSHA PSM relief device design documentation.
Speak with our team to scope an engagement tailored to your facility, regulatory context, and lifecycle stage.