---
title: Are Emergency Relief Systems Missing From Your Relief System Design?
description: Emergency Relief Systems (ERS) are needed for processes where a thermal hazard exists. A thermal runaway can be a dangerous situation that could result in an unacceptable over-pressurization of the system. We explain more in this blog.
image: https://www.fauske.com/hs-fs/hub/232514/file-1602358640.png
---

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![VSP2wscreen](https://www.fauske.com/hs-fs/hub/232514/file-1602358640.png?width=300&name=file-1602358640.png)How do you ensure or work to continuously increase plant safety? One sure way is in the appropriate design of [emergency relief systems (ERS)](https://www.fauske.com/blog/emergency-relief-system-design-using-diers-technology). ERS are needed for processes where a thermal hazard exists. A thermal runaway reaction can be an unacceptable over-pressurization of the system that could result in a dangerous situation. Do you have a turnkey approach through a combination of testing and analysis, to check and address your ERS?

Your arsenal should include:

## **Chemical Testing**

- Tests should be performed to characterize the runaway reaction under the upset conditions of interest.
- Are your temperature and pressure data measured and scaled to the process vessel?
- Are you armed with state of the art tools such as Vent Sizing Package 2TM (VSP2) and Advanced Reactive System Screening ToolTM (ARSST)?

## **Process Simulation**

- Have you evaluated the required vent size? Tools such as Practical Emergency Vent Sizing Software (PrEVent) are necessary. 
- The design of the existing or new ERS should be analyzed with commercial transient analysis codes for its performance in handling the effluent.
- Depressurization of transient fluid forces should be computed by tracking momentum flux, thrust and pressure waves.

## **![Relief System Design 0316](https://www.fauske.com/hs-fs/hubfs/Relief%20System%20Design%200316.jpg?width=348&name=Relief%20System%20Design%200316.jpg)Structural Design**

- The ERS design should be evaluated in a structural analysis code.
- Pipe support design should be evaluated and reviewed.
- Dynamic stress analysis of the ERS should be conducted. 
- Code compliance should be verified against specific requirements, e.g. ASME B31.3, EN-13480, and others.

## **Additional Considerations**

- Effluent handling (quench tank, knockout drum) evaluations.
- Dispersion modeling - can be a very important and often overlooked component to the ERS program. 

For more ideas, questions or discussion on a comprehensive [Emergency Relief System Design Plan](https://www.fauske.com/blog/emergency-relief-system-design-using-diers-technology), please contact us.

 

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