(46a) Comparison between Steady State and Dynamic Pressure Relief Calculations
AIChE Spring Meeting and Global Congress on Process Safety
2019
2019 Spring Meeting and 15th Global Congress on Process Safety
Global Congress on Process Safety
Pressure Relief Design III
Monday, April 1, 2019 - 3:30pm to 4:00pm
API Standard 521 is also open to the application of dynamic simulations when considering pressure relief systems calculations. Some overpressure scenarios are very dynamic in their nature, such as external fire exposure, abnormal heat input, vapor breakthrough and runaway reaction, to name a few.
Modeling overpressure scenarios dynamically can allow for a more acurate, less conservative, representation of the affected system; resulting in a lower relief requirement as well as an understanding how the system pressure and temperature changes over time.
This paper compares overpressure scenarios which are modeled using steady state calculations versus the same system modeled dynamically. It is intended to give the user a better understanding of the differences in the two approaches, as well as the benefits of applying dynamic simulation for specific scenarios.
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