Pressure Relief Analysis Using Aspen Plus

Learn how to define overpressure systems using Aspen Plus in accordance with API 520, 521 and 2000. Design single or multiple relief valves for all applicable scenarios in an overpressure system. Document the full overpressure analysis within Aspen Plus.


  • Process design professionals wishing to enhance their understanding of PSV design and sizing
  • New engineers wishing to gain experience in overpressure analysis with Aspen Plus

Training Details

  • Course Id:


  • Duration:

    1 day(s)

  • CEUs Awarded:


  • Level:



  • Define overpressure scenarios in Aspen Plus using industry-standard methods
  • Design single or multiple relief valve arrangements for applicable relief scenarios
  • Integrate relief device piping considerations into the study of overpressure scenarios


  • High level instruction on pressure relief analysis
  • Discussion on the general approach and the key elements for successful ¬†PSV design and rating
  • Use of Aspen Plus in design and simulation exercises covering various pressure relief scenarios
  • Hands-on workshops using examples using real steady-state simulations in Aspen Plus
  • Detailed course notes and workshop instructions


  • Previously attended EAP101 Aspen Plus: Process Modeling
  • Or a working knowledge of Aspen Plus in steady-state


Introduction to Pressure Relief Devices (PRDs) & Safety Analysis
  • Identify and define relief valve design requirements
  • Examine a high-level overview of a pressure relief analysis workflow
  • Identify the benefits of relief valve analysis in Aspen Plus

Getting Started
  • Introduce the Aspen Plus Safety Analysis Environment
  • Specify global values used in relief analysis including valve defaults, custom orifices, and line design preferences
  • Review the available pressure relief devices in the Safety Analysis Environment and learn how to add them to a simulation
  • Workshop: Getting Started in the Safety Analysis Environment

Defining a Pressure Safety Valve (PSV)
  • Define vessel design and operating conditions to the pressure relief study
  • Review pressure safety valve types and their characteristics
  • Gain familiarity with the PSV data forms in Aspen Plus
  • Workshop: Setting Up an Equipment-Based Overpressure Analysis

Identifying Relief Scenarios
  • Learn the procedure for creating relief scenarios in Aspen Plus, incorporating items such as backpressure, required relieving rate, and orifice selection
  • Discuss the inputs and methodology for Blocked Outlet emergencies
  • Identify applicable relieving phase calculation methods and their applications
  • Workshop: Analyzing Applicable Scenarios

Fire Case Scenarios
  • Introduce options for calculating fire case emergency relief situations in Aspen Plus
  • Outline the basics of API 521 Wetted/Un-wetted and semi-dynamic approaches to calculating fire emergency relief rates
  • Workshop: Calculate the Required Fire Relief Load

Multiple Relief Valve Configurations
  • Examine how to select a relief scenario for relief sizing purposes
  • Explore how to configure multiple relief devices to handle varying potential emergency scenarios
  • Workshop: Designing the Pressure Relief Device

Relief Device Piping
  • Discover how to construct and model inlet and outlet piping from a pressure relief device
  • Configure line sizing parameters and criteria
  • Workshop: Line Sizing in the Safety Analysis Environment

Documenting Pressure Relief Device (PRD) Calculations
  • Discuss how to access pressure relief device reports and documentation through the Documentation Builder feature
  • Review the various types of documentation available and discuss its value for compliance and project reporting
  • Workshop: Building Pressure Relief Analysis Documentation

Optional Exercises and Extra Materials ( Time Permitting)

Export Data To Aspen Flare System Analyzer
  • Review Aspen Flare System Analyzer as a tool for modeling vent & flare piping header systems
  • Discuss the procedure for importing data from the Plus Safety Analysis Environment into a Flare System Analyzer file
  • Workshop: Import PRD Data into Aspen Flare System Analyzer

Calculating Relief Loads - Other Scenarios
  • Review the option to internally calculate relieving rates for various emergency scenarios
  • Discuss the calculations for control valve failure, heat exchanger tube rupture, thermal expansion, fan failure, and reflux failure scenarios
  • Workshop: Calculate Relief Loads Based on Control Valve Failure
  • Workshop: Calculate Relief Loads Based on Heat Exchanger Tube Failure
  • Workshop: Calculate Relief Loads Based on Thermal Expansion

Storage Tank Protection
  • Introduce the Storage Tank Protection capability for modeling venting in/out of low pressure storage tanks
  • Review the workflow for defining storage tank design data, normal venting parameters, and emergency venting settings
  • Workshop: Evaluate Vent Rates for Storage Tank Protection

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Aspen Technology, Inc. awards Continuing Education Units (CEUs) for training classes conducted by our organization. One CEU is granted for every 10 hours of class participation.