Overpressure Relief and Flare Analysis

COURSE DESCRIPTION                                                                             DURATION: 3 Days

This seminar covers the application of relief devices for preventing over-pressure and under-pressure in equipment. The attendee will learn the requirements for designing and documenting pressure relief systems and specifying relief devices for those systems.


Upon completion of this course the attendee will be able to:

  • Describe the various types of relief devices and how they function
  • Understand how equipment may be over-pressured
  • Know how to document Pressure Relief Systems
  • Know how to specify and size a relief device
  • Know what relief device resources are available
  • Understand how codes, standards, and regulatory agencies influence the design of relief systems (e.g.; API RP 520/521)
  • Know how to screen for two-phase flow
  • Understand about flare headers and flares


  • Process Engineers, Design Engineers, Maintenance Group, PSM coordinators/managers, plant management, HSE, O&M personnel, and others responsible for Risk Management.




Day 1

  • Introductions, Rules and Course Objectives
  • Industry Regulations, Codes and Standards for Pressure Relief and Flare Systems
  • Pressure Relief Device Terminology
  • ASME Code Relief Device Requirements
  • Types of Relief Valves (i.e., Conventional, Balanced Bellows and Pilot Operated)
  • Rupture Disks
Day 2


    • PRD Documentation Requirements with no gaps allowed
    • Relief Scenario Analysis
    • Introduction to PSV Calculations – General Theory building by going over the 25 Possible Relief Scenarios One by One (i.e., Review the API RP 520/521 rules)

Day 3:

  • Storage Tank Relief Devices (i.e., PVRVs    (Conservation/Breather Vents), Manhole cover weighted   emergency reliefs, vacuum reliefs, flame arresters)
  • Flare Header Design
  • Flare and Flare Knockout Pots
  • Vent to a Safe Place Discussion
  • Two Phase Flow Comments