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Pressure build up in a system may occur as a result of a process upset, instrument failure or fire. These upset scenarios can result in either, or both, vaporization due to exothermic runaway reactions or generation of gases because of the decomposition process, which are of particular interest in terms of system and public safety. The extent of the potential hazards caused by such incidents are generally determined by the magnitude of the exothermic energy, the chemical substance makeup, and the quantity of the effluent.

JENSEN HUGHES is dedicated to providing a range of engineering services to increase plant safety. Our team is built upon top experts consisting of chemical safety, thermal-hydraulics and structural engineers to provide turn-key solutions for Emergency Relief System (ERS) design to mitigate potential hazard scenarios.

Service Offerings

  • Hazard and operability study (HAZOP) and process hazard analysis (PHA)
  • Adiabatic calorimetry testing (e.g. APTACTM, VSP2TM)
  • Vent size calculation based on ISO 4126-10 or Design Institute for Emergency Relief Systems (DIERS) methodology
  • Transient analysis of the system to evaluate the system performance during effluent discharge and the back pressure of other tanks potentially connected to the system
  • Calculation of transient forces generated by the acceleration of the effluent through the system
  • Dynamic structural design (piping stress analysis, vessel and nozzle evaluation and pipe support evaluation) in accordance with applicable codes, e.g. ASME B31.3, ASME Boiler and Pressure Vessel Code Section VIII
  • Consequence analysis for dispersion of chemicals into the atmosphere

emergency relief system design

Pressure at different locations of an emergency relief system

emergency relief system design

Hydrodynamic loads for a pipe segment connected to a catch tank

emergency relief system

Pressure at different locations of an emergency relief system.

hydrodynamic loads

Hydrodynamic loads for a pipe segment connected to a catch tank.

Relief System Design

Threat zones based on the postulated chemical effluent release.

Speak to a JENSEN HUGHES representative today about how we can help you with Relief System Design:

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