Two-Phase Flow Methods Webinar

Two-Phase Flow Methods Webinar


Learn the DIERS methodology for proper sizing of safety relief systems for two-phase vapor-liquid flow for flashing or frozen, viscous or nonviscous fluids. An inaccurate model for flow through a valve/nozzle could result in either undersizing or oversizing the valve. If undersized, the valve will have insufficient capacity to prevent overpressuring of the vessel. An oversized valve can also have negative consequences. To minimize the potential for unacceptable risk, it is of particular importance to ensure the design will either avoid or accommodate the two-phase vapor-liquid flow. In this 60-minute webinar, an overview of the appropriate models for Emergency Relief System (ERS) design for two-phase vapor-liquid flow is presented, along with a discussion of the conditions under which each gives reliable results. The DIERS ERS design methodology is demonstrated utilizing selected sample problems.


  • What scenarios can lead to two-phase flow under relief conditions
  • Why it is preferred to eliminate/significantly reduce the likelihood of two-phase flow
  • Overview of the Omega, Simpson, and VdP direct integration methods
  • Examples in SuperChems™ for DIERS
  • Replication of industry relief design case studies

Skill Level


Who Should Attend

These webinars are designed for chemical engineers involved in pressure relief and flare system design, chemical reactions, and those safety-related professionals interested in advancing their knowledge on process safety and risk assessment.

DIERS Technology Fundamentals Webinar Series

This 4-part webinar series is prepared as a foundational resource on DIERS technology and how it can be applied to your emergency relief systems. An examination of how these approaches have evolved as well as the latest methodologies will be discussed and provided. Each one-hour session is devoted to a principle or approach on emergency relief systems (ERS) design regarding chemical reactivity or depressurization. Practical examples, case studies, and white paper resources will enrich your learning experience. Discover how DIERS technology can help your facility comply with Process Safety Information (PSI) requirements with methodology and tools that improve accuracy and efficiency.


The Design Institute for Emergency Relief Systems (DIERS) was formed in 1976 as a consortium of 29 companies to develop methods for the design of emergency relief systems to handle runaway reactions. Read more...

Our Presenters

  • Georges Melhem

    President & CEO

    The founder of ioMosaic and internationally renowned expert in the areas of pressure relief and flare systems design, chemical reaction systems, process safety and risk analysis. Read more...

Fees: $99
Type: Webinar
Language: English
Skill Level: Intermediate
Contact: Kristi Marak or Lisa Ruth


Telephone: 713.490.5220

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Have Questions?

Contact: Lisa Ruth
Tel: 713.490.5220

Training Benefits

Top instructors with extensive global, industry, technical and litigation experience. You will receive clear, practical and real world recommendations on how to get and stay compliant with local and worldwide regulations.