Applications of Advanced Process Modelling in Process Safety for Oil & Gas

High-fidelity analysis is taking an increasingly central role in safe and cost effective design of pressure relief, blowdown and flare systems in the oil and gas industry. As leaders in the application of advanced analysis to safe design of the flare and blowdown systems, PSE will present current approaches and lead a discussion on the latest and upcoming changes to API 521.

This seminar describes how to apply an analytical methodology to assess vessel survivability under fire attack and inform blowdown system design. Updated industry standards, including the 6th edition of API 521, now recognise the need to consider vessel stress during blowdown and, critically, that guidance issued prior to 2014 may not be an appropriate basis for vessel survivability. The session explains why vessels are at risk when exposed to fire, the potential for loss of containment and the possible escalation to a major hazard. Industrial case studies shared here demonstrate how this rigorous analysis can help make informed design decisions, verify the acceptability of slower depressurisation rates to maintain vessel integrity and provide solutions to complex situations where application of Passive Fire Protection is not practical or flare capacity is limiting. In this session, the different operational scenarios that determine the MDMT of blowdown system are discussed and how distributed modelling approach can help accurately calculate minimum metal temperatures both within the process segment and flare piping. Industrial case studies show low temperature assessments on segment pressurisation, gas capped well start-up and cold blowdown demonstrate how detailed low temperature assessments can help determine MDMT and mitigate risks.

The seminar will also look at the latest approaches to assess and mitigate vibrational risks in flare systems: around 20% of all hydrocarbon releases in the industry are now due to vibration induced fatigues and industry guidelines are currently being reviewed to address this issue. In this session using recent case studies from the industry, we will illustrate how simple, easy to use tools can be applied to screen plants for flow induced vibration (FIV) risks. We will also show how more complex assessments help avoid design changes or identify mitigations when a pipe section fail screening assessments.

Agenda

08:30 Registration
09:00 Session 1 – Depressuring and Low temperature Analysis
  • Requirements for pressure relief devices and depressuring systems
  • Risks during depressuring (brittle fracture / fire stress rupture)
  • Analysis of complex systems and Mitigations
  • Connected Process and Flare Models
10:00 Session 2 – Fire Survivability Analysis
  • Guidelines for API 521 empirical and analytical methods
  • The analytical method for fire analysis
    • Vessel wall temperature Model
    • Stress calculations and rupture prediction
    • Validation
  • Case examples
10:50 Break
11:30 Session 3 – Dynamic Modelling of Pressure Relieving Systems
  • Best Practices in Verification of Overpressure Protection Systems
  • Dynamic Models for accurate sizing of relief valves
  • 3% Rule and Valve Stability
  • Vibration analysis (AIV/ FIV)
12:30 Close

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